drivers/block/nvme-scsi.c

   1 /*
   2  * NVM Express device driver
   3  * Copyright (c) 2011, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 /*
  20  * Refer to the SCSI-NVMe Translation spec for details on how
  21  * each command is translated.
  22  */
  23
  24 #include <linux/nvme.h>
  25 #include <linux/bio.h>
  26 #include <linux/bitops.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/delay.h>
  29 #include <linux/errno.h>
  30 #include <linux/fs.h>
  31 #include <linux/genhd.h>
  32 #include <linux/idr.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/io.h>
  36 #include <linux/kdev_t.h>
  37 #include <linux/kthread.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/module.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/pci.h>
  43 #include <linux/poison.h>
  44 #include <linux/sched.h>
  45 #include <linux/slab.h>
  46 #include <linux/types.h>
  47 #include <scsi/sg.h>
  48 #include <scsi/scsi.h>
  49
  50
  51 static int sg_version_num = 30534;      /* 2 digits for each component */
  52
  53 #define SNTI_TRANSLATION_SUCCESS                        0
  54 #define SNTI_INTERNAL_ERROR                             1
  55
  56 /* VPD Page Codes */
  57 #define VPD_SUPPORTED_PAGES                             0x00
  58 #define VPD_SERIAL_NUMBER                               0x80
  59 #define VPD_DEVICE_IDENTIFIERS                          0x83
  60 #define VPD_EXTENDED_INQUIRY                            0x86
  61 #define VPD_BLOCK_DEV_CHARACTERISTICS                   0xB1
  62
  63 /* CDB offsets */
  64 #define REPORT_LUNS_CDB_ALLOC_LENGTH_OFFSET             6
  65 #define REPORT_LUNS_SR_OFFSET                           2
  66 #define READ_CAP_16_CDB_ALLOC_LENGTH_OFFSET             10
  67 #define REQUEST_SENSE_CDB_ALLOC_LENGTH_OFFSET           4
  68 #define REQUEST_SENSE_DESC_OFFSET                       1
  69 #define REQUEST_SENSE_DESC_MASK                         0x01
  70 #define DESCRIPTOR_FORMAT_SENSE_DATA_TYPE               1
  71 #define INQUIRY_EVPD_BYTE_OFFSET                        1
  72 #define INQUIRY_PAGE_CODE_BYTE_OFFSET                   2
  73 #define INQUIRY_EVPD_BIT_MASK                           1
  74 #define INQUIRY_CDB_ALLOCATION_LENGTH_OFFSET            3
  75 #define START_STOP_UNIT_CDB_IMMED_OFFSET                1
  76 #define START_STOP_UNIT_CDB_IMMED_MASK                  0x1
  77 #define START_STOP_UNIT_CDB_POWER_COND_MOD_OFFSET       3
  78 #define START_STOP_UNIT_CDB_POWER_COND_MOD_MASK         0xF
  79 #define START_STOP_UNIT_CDB_POWER_COND_OFFSET           4
  80 #define START_STOP_UNIT_CDB_POWER_COND_MASK             0xF0
  81 #define START_STOP_UNIT_CDB_NO_FLUSH_OFFSET             4
  82 #define START_STOP_UNIT_CDB_NO_FLUSH_MASK               0x4
  83 #define START_STOP_UNIT_CDB_START_OFFSET                4
  84 #define START_STOP_UNIT_CDB_START_MASK                  0x1
  85 #define WRITE_BUFFER_CDB_MODE_OFFSET                    1
  86 #define WRITE_BUFFER_CDB_MODE_MASK                      0x1F
  87 #define WRITE_BUFFER_CDB_BUFFER_ID_OFFSET               2
  88 #define WRITE_BUFFER_CDB_BUFFER_OFFSET_OFFSET           3
  89 #define WRITE_BUFFER_CDB_PARM_LIST_LENGTH_OFFSET        6
  90 #define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_OFFSET         1
  91 #define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_MASK           0xC0
  92 #define FORMAT_UNIT_CDB_FORMAT_PROT_INFO_SHIFT          6
  93 #define FORMAT_UNIT_CDB_LONG_LIST_OFFSET                1
  94 #define FORMAT_UNIT_CDB_LONG_LIST_MASK                  0x20
  95 #define FORMAT_UNIT_CDB_FORMAT_DATA_OFFSET              1
  96 #define FORMAT_UNIT_CDB_FORMAT_DATA_MASK                0x10
  97 #define FORMAT_UNIT_SHORT_PARM_LIST_LEN                 4
  98 #define FORMAT_UNIT_LONG_PARM_LIST_LEN                  8
  99 #define FORMAT_UNIT_PROT_INT_OFFSET                     3
 100 #define FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET             0
 101 #define FORMAT_UNIT_PROT_FIELD_USAGE_MASK               0x07
 102 #define UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET              7
 103
 104 /* Misc. defines */
 105 #define NIBBLE_SHIFT                                    4
 106 #define FIXED_SENSE_DATA                                0x70
 107 #define DESC_FORMAT_SENSE_DATA                          0x72
 108 #define FIXED_SENSE_DATA_ADD_LENGTH                     10
 109 #define LUN_ENTRY_SIZE                                  8
 110 #define LUN_DATA_HEADER_SIZE                            8
 111 #define ALL_LUNS_RETURNED                               0x02
 112 #define ALL_WELL_KNOWN_LUNS_RETURNED                    0x01
 113 #define RESTRICTED_LUNS_RETURNED                        0x00
 114 #define NVME_POWER_STATE_START_VALID                    0x00
 115 #define NVME_POWER_STATE_ACTIVE                         0x01
 116 #define NVME_POWER_STATE_IDLE                           0x02
 117 #define NVME_POWER_STATE_STANDBY                        0x03
 118 #define NVME_POWER_STATE_LU_CONTROL                     0x07
 119 #define POWER_STATE_0                                   0
 120 #define POWER_STATE_1                                   1
 121 #define POWER_STATE_2                                   2
 122 #define POWER_STATE_3                                   3
 123 #define DOWNLOAD_SAVE_ACTIVATE                          0x05
 124 #define DOWNLOAD_SAVE_DEFER_ACTIVATE                    0x0E
 125 #define ACTIVATE_DEFERRED_MICROCODE                     0x0F
 126 #define FORMAT_UNIT_IMMED_MASK                          0x2
 127 #define FORMAT_UNIT_IMMED_OFFSET                        1
 128 #define KELVIN_TEMP_FACTOR                              273
 129 #define FIXED_FMT_SENSE_DATA_SIZE                       18
 130 #define DESC_FMT_SENSE_DATA_SIZE                        8
 131
 132 /* SCSI/NVMe defines and bit masks */
 133 #define INQ_STANDARD_INQUIRY_PAGE                       0x00
 134 #define INQ_SUPPORTED_VPD_PAGES_PAGE                    0x00
 135 #define INQ_UNIT_SERIAL_NUMBER_PAGE                     0x80
 136 #define INQ_DEVICE_IDENTIFICATION_PAGE                  0x83
 137 #define INQ_EXTENDED_INQUIRY_DATA_PAGE                  0x86
 138 #define INQ_BDEV_CHARACTERISTICS_PAGE                   0xB1
 139 #define INQ_SERIAL_NUMBER_LENGTH                        0x14
 140 #define INQ_NUM_SUPPORTED_VPD_PAGES                     5
 141 #define VERSION_SPC_4                                   0x06
 142 #define ACA_UNSUPPORTED                                 0
 143 #define STANDARD_INQUIRY_LENGTH                         36
 144 #define ADDITIONAL_STD_INQ_LENGTH                       31
 145 #define EXTENDED_INQUIRY_DATA_PAGE_LENGTH               0x3C
 146 #define RESERVED_FIELD                                  0
 147
 148 /* SCSI READ/WRITE Defines */
 149 #define IO_CDB_WP_MASK                                  0xE0
 150 #define IO_CDB_WP_SHIFT                                 5
 151 #define IO_CDB_FUA_MASK                                 0x8
 152 #define IO_6_CDB_LBA_OFFSET                             0
 153 #define IO_6_CDB_LBA_MASK                               0x001FFFFF
 154 #define IO_6_CDB_TX_LEN_OFFSET                          4
 155 #define IO_6_DEFAULT_TX_LEN                             256
 156 #define IO_10_CDB_LBA_OFFSET                            2
 157 #define IO_10_CDB_TX_LEN_OFFSET                         7
 158 #define IO_10_CDB_WP_OFFSET                             1
 159 #define IO_10_CDB_FUA_OFFSET                            1
 160 #define IO_12_CDB_LBA_OFFSET                            2
 161 #define IO_12_CDB_TX_LEN_OFFSET                         6
 162 #define IO_12_CDB_WP_OFFSET                             1
 163 #define IO_12_CDB_FUA_OFFSET                            1
 164 #define IO_16_CDB_FUA_OFFSET                            1
 165 #define IO_16_CDB_WP_OFFSET                             1
 166 #define IO_16_CDB_LBA_OFFSET                            2
 167 #define IO_16_CDB_TX_LEN_OFFSET                         10
 168
 169 /* Mode Sense/Select defines */
 170 #define MODE_PAGE_INFO_EXCEP                            0x1C
 171 #define MODE_PAGE_CACHING                               0x08
 172 #define MODE_PAGE_CONTROL                               0x0A
 173 #define MODE_PAGE_POWER_CONDITION                       0x1A
 174 #define MODE_PAGE_RETURN_ALL                            0x3F
 175 #define MODE_PAGE_BLK_DES_LEN                           0x08
 176 #define MODE_PAGE_LLBAA_BLK_DES_LEN                     0x10
 177 #define MODE_PAGE_CACHING_LEN                           0x14
 178 #define MODE_PAGE_CONTROL_LEN                           0x0C
 179 #define MODE_PAGE_POW_CND_LEN                           0x28
 180 #define MODE_PAGE_INF_EXC_LEN                           0x0C
 181 #define MODE_PAGE_ALL_LEN                               0x54
 182 #define MODE_SENSE6_MPH_SIZE                            4
 183 #define MODE_SENSE6_ALLOC_LEN_OFFSET                    4
 184 #define MODE_SENSE_PAGE_CONTROL_OFFSET                  2
 185 #define MODE_SENSE_PAGE_CONTROL_MASK                    0xC0
 186 #define MODE_SENSE_PAGE_CODE_OFFSET                     2
 187 #define MODE_SENSE_PAGE_CODE_MASK                       0x3F
 188 #define MODE_SENSE_LLBAA_OFFSET                         1
 189 #define MODE_SENSE_LLBAA_MASK                           0x10
 190 #define MODE_SENSE_LLBAA_SHIFT                          4
 191 #define MODE_SENSE_DBD_OFFSET                           1
 192 #define MODE_SENSE_DBD_MASK                             8
 193 #define MODE_SENSE_DBD_SHIFT                            3
 194 #define MODE_SENSE10_MPH_SIZE                           8
 195 #define MODE_SENSE10_ALLOC_LEN_OFFSET                   7
 196 #define MODE_SELECT_CDB_PAGE_FORMAT_OFFSET              1
 197 #define MODE_SELECT_CDB_SAVE_PAGES_OFFSET               1
 198 #define MODE_SELECT_6_CDB_PARAM_LIST_LENGTH_OFFSET      4
 199 #define MODE_SELECT_10_CDB_PARAM_LIST_LENGTH_OFFSET     7
 200 #define MODE_SELECT_CDB_PAGE_FORMAT_MASK                0x10
 201 #define MODE_SELECT_CDB_SAVE_PAGES_MASK                 0x1
 202 #define MODE_SELECT_6_BD_OFFSET                         3
 203 #define MODE_SELECT_10_BD_OFFSET                        6
 204 #define MODE_SELECT_10_LLBAA_OFFSET                     4
 205 #define MODE_SELECT_10_LLBAA_MASK                       1
 206 #define MODE_SELECT_6_MPH_SIZE                          4
 207 #define MODE_SELECT_10_MPH_SIZE                         8
 208 #define CACHING_MODE_PAGE_WCE_MASK                      0x04
 209 #define MODE_SENSE_BLK_DESC_ENABLED                     0
 210 #define MODE_SENSE_BLK_DESC_COUNT                       1
 211 #define MODE_SELECT_PAGE_CODE_MASK                      0x3F
 212 #define SHORT_DESC_BLOCK                                8
 213 #define LONG_DESC_BLOCK                                 16
 214 #define MODE_PAGE_POW_CND_LEN_FIELD                     0x26
 215 #define MODE_PAGE_INF_EXC_LEN_FIELD                     0x0A
 216 #define MODE_PAGE_CACHING_LEN_FIELD                     0x12
 217 #define MODE_PAGE_CONTROL_LEN_FIELD                     0x0A
 218 #define MODE_SENSE_PC_CURRENT_VALUES                    0
 219
 220 /* Log Sense defines */
 221 #define LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE               0x00
 222 #define LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH             0x07
 223 #define LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE          0x2F
 224 #define LOG_PAGE_TEMPERATURE_PAGE                       0x0D
 225 #define LOG_SENSE_CDB_SP_OFFSET                         1
 226 #define LOG_SENSE_CDB_SP_NOT_ENABLED                    0
 227 #define LOG_SENSE_CDB_PC_OFFSET                         2
 228 #define LOG_SENSE_CDB_PC_MASK                           0xC0
 229 #define LOG_SENSE_CDB_PC_SHIFT                          6
 230 #define LOG_SENSE_CDB_PC_CUMULATIVE_VALUES              1
 231 #define LOG_SENSE_CDB_PAGE_CODE_MASK                    0x3F
 232 #define LOG_SENSE_CDB_ALLOC_LENGTH_OFFSET               7
 233 #define REMAINING_INFO_EXCP_PAGE_LENGTH                 0x8
 234 #define LOG_INFO_EXCP_PAGE_LENGTH                       0xC
 235 #define REMAINING_TEMP_PAGE_LENGTH                      0xC
 236 #define LOG_TEMP_PAGE_LENGTH                            0x10
 237 #define LOG_TEMP_UNKNOWN                                0xFF
 238 #define SUPPORTED_LOG_PAGES_PAGE_LENGTH                 0x3
 239
 240 /* Read Capacity defines */
 241 #define READ_CAP_10_RESP_SIZE                           8
 242 #define READ_CAP_16_RESP_SIZE                           32
 243
 244 /* NVMe Namespace and Command Defines */
 245 #define NVME_GET_SMART_LOG_PAGE                         0x02
 246 #define NVME_GET_FEAT_TEMP_THRESH                       0x04
 247 #define BYTES_TO_DWORDS                                 4
 248 #define NVME_MAX_FIRMWARE_SLOT                          7
 249
 250 /* Report LUNs defines */
 251 #define REPORT_LUNS_FIRST_LUN_OFFSET                    8
 252
 253 /* SCSI ADDITIONAL SENSE Codes */
 254
 255 #define SCSI_ASC_NO_SENSE                               0x00
 256 #define SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT             0x03
 257 #define SCSI_ASC_LUN_NOT_READY                          0x04
 258 #define SCSI_ASC_WARNING                                0x0B
 259 #define SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED           0x10
 260 #define SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED          0x10
 261 #define SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED          0x10
 262 #define SCSI_ASC_UNRECOVERED_READ_ERROR                 0x11
 263 #define SCSI_ASC_MISCOMPARE_DURING_VERIFY               0x1D
 264 #define SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID           0x20
 265 #define SCSI_ASC_ILLEGAL_COMMAND                        0x20
 266 #define SCSI_ASC_ILLEGAL_BLOCK                          0x21
 267 #define SCSI_ASC_INVALID_CDB                            0x24
 268 #define SCSI_ASC_INVALID_LUN                            0x25
 269 #define SCSI_ASC_INVALID_PARAMETER                      0x26
 270 #define SCSI_ASC_FORMAT_COMMAND_FAILED                  0x31
 271 #define SCSI_ASC_INTERNAL_TARGET_FAILURE                0x44
 272
 273 /* SCSI ADDITIONAL SENSE Code Qualifiers */
 274
 275 #define SCSI_ASCQ_CAUSE_NOT_REPORTABLE                  0x00
 276 #define SCSI_ASCQ_FORMAT_COMMAND_FAILED                 0x01
 277 #define SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED          0x01
 278 #define SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED         0x02
 279 #define SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED         0x03
 280 #define SCSI_ASCQ_FORMAT_IN_PROGRESS                    0x04
 281 #define SCSI_ASCQ_POWER_LOSS_EXPECTED                   0x08
 282 #define SCSI_ASCQ_INVALID_LUN_ID                        0x09
 283
 284 /**
 285  * DEVICE_SPECIFIC_PARAMETER in mode parameter header (see sbc2r16) to
 286  * enable DPOFUA support type 0x10 value.
 287  */
 288 #define DEVICE_SPECIFIC_PARAMETER                       0
 289 #define VPD_ID_DESCRIPTOR_LENGTH sizeof(VPD_IDENTIFICATION_DESCRIPTOR)
 290
 291 /* MACROs to extract information from CDBs */
 292
 293 #define GET_OPCODE(cdb)         cdb[0]
 294
 295 #define GET_U8_FROM_CDB(cdb, index) (cdb[index] << 0)
 296
 297 #define GET_U16_FROM_CDB(cdb, index) ((cdb[index] << 8) | (cdb[index + 1] << 0))
 298
 299 #define GET_U24_FROM_CDB(cdb, index) ((cdb[index] << 16) | \
 300 (cdb[index + 1] <<  8) | \
 301 (cdb[index + 2] <<  0))
 302
 303 #define GET_U32_FROM_CDB(cdb, index) ((cdb[index] << 24) | \
 304 (cdb[index + 1] << 16) | \
 305 (cdb[index + 2] <<  8) | \
 306 (cdb[index + 3] <<  0))
 307
 308 #define GET_U64_FROM_CDB(cdb, index) ((((u64)cdb[index]) << 56) | \
 309 (((u64)cdb[index + 1]) << 48) | \
 310 (((u64)cdb[index + 2]) << 40) | \
 311 (((u64)cdb[index + 3]) << 32) | \
 312 (((u64)cdb[index + 4]) << 24) | \
 313 (((u64)cdb[index + 5]) << 16) | \
 314 (((u64)cdb[index + 6]) <<  8) | \
 315 (((u64)cdb[index + 7]) <<  0))
 316
 317 /* Inquiry Helper Macros */
 318 #define GET_INQ_EVPD_BIT(cdb) \
 319 ((GET_U8_FROM_CDB(cdb, INQUIRY_EVPD_BYTE_OFFSET) &              \
 320 INQUIRY_EVPD_BIT_MASK) ? 1 : 0)
 321
 322 #define GET_INQ_PAGE_CODE(cdb)                                  \
 323 (GET_U8_FROM_CDB(cdb, INQUIRY_PAGE_CODE_BYTE_OFFSET))
 324
 325 #define GET_INQ_ALLOC_LENGTH(cdb)                               \
 326 (GET_U16_FROM_CDB(cdb, INQUIRY_CDB_ALLOCATION_LENGTH_OFFSET))
 327
 328 /* Report LUNs Helper Macros */
 329 #define GET_REPORT_LUNS_ALLOC_LENGTH(cdb)                       \
 330 (GET_U32_FROM_CDB(cdb, REPORT_LUNS_CDB_ALLOC_LENGTH_OFFSET))
 331
 332 /* Read Capacity Helper Macros */
 333 #define GET_READ_CAP_16_ALLOC_LENGTH(cdb)                       \
 334 (GET_U32_FROM_CDB(cdb, READ_CAP_16_CDB_ALLOC_LENGTH_OFFSET))
 335
 336 #define IS_READ_CAP_16(cdb)                                     \
 337 ((cdb[0] == SERVICE_ACTION_IN && cdb[1] == SAI_READ_CAPACITY_16) ? 1 : 0)
 338
 339 /* Request Sense Helper Macros */
 340 #define GET_REQUEST_SENSE_ALLOC_LENGTH(cdb)                     \
 341 (GET_U8_FROM_CDB(cdb, REQUEST_SENSE_CDB_ALLOC_LENGTH_OFFSET))
 342
 343 /* Mode Sense Helper Macros */
 344 #define GET_MODE_SENSE_DBD(cdb)                                 \
 345 ((GET_U8_FROM_CDB(cdb, MODE_SENSE_DBD_OFFSET) & MODE_SENSE_DBD_MASK) >> \
 346 MODE_SENSE_DBD_SHIFT)
 347
 348 #define GET_MODE_SENSE_LLBAA(cdb)                               \
 349 ((GET_U8_FROM_CDB(cdb, MODE_SENSE_LLBAA_OFFSET) &               \
 350 MODE_SENSE_LLBAA_MASK) >> MODE_SENSE_LLBAA_SHIFT)
 351
 352 #define GET_MODE_SENSE_MPH_SIZE(cdb10)                          \
 353 (cdb10 ? MODE_SENSE10_MPH_SIZE : MODE_SENSE6_MPH_SIZE)
 354
 355
 356 /* Struct to gather data that needs to be extracted from a SCSI CDB.
 357    Not conforming to any particular CDB variant, but compatible with all. */
 358
 359 struct nvme_trans_io_cdb {
 360         u8 fua;
 361         u8 prot_info;
 362         u64 lba;
 363         u32 xfer_len;
 364 };
 365
 366
 367 /* Internal Helper Functions */
 368
 369
 370 /* Copy data to userspace memory */
 371
 372 static int nvme_trans_copy_to_user(struct sg_io_hdr *hdr, void *from,
 373                                                                 unsigned long n)
 374 {
 375         int res = SNTI_TRANSLATION_SUCCESS;
 376         unsigned long not_copied;
 377         int i;
 378         void *index = from;
 379         size_t remaining = n;
 380         size_t xfer_len;
 381
 382         if (hdr->iovec_count > 0) {
 383                 struct sg_iovec sgl;
 384
 385                 for (i = 0; i < hdr->iovec_count; i++) {
 386                         not_copied = copy_from_user(&sgl, hdr->dxferp +
 387                                                 i * sizeof(struct sg_iovec),
 388                                                 sizeof(struct sg_iovec));
 389                         if (not_copied)
 390                                 return -EFAULT;
 391                         xfer_len = min(remaining, sgl.iov_len);
 392                         not_copied = copy_to_user(sgl.iov_base, index,
 393                                                                 xfer_len);
 394                         if (not_copied) {
 395                                 res = -EFAULT;
 396                                 break;
 397                         }
 398                         index += xfer_len;
 399                         remaining -= xfer_len;
 400                         if (remaining == 0)
 401                                 break;
 402                 }
 403                 return res;
 404         }
 405         not_copied = copy_to_user(hdr->dxferp, from, n);
 406         if (not_copied)
 407                 res = -EFAULT;
 408         return res;
 409 }
 410
 411 /* Copy data from userspace memory */
 412
 413 static int nvme_trans_copy_from_user(struct sg_io_hdr *hdr, void *to,
 414                                                                 unsigned long n)
 415 {
 416         int res = SNTI_TRANSLATION_SUCCESS;
 417         unsigned long not_copied;
 418         int i;
 419         void *index = to;
 420         size_t remaining = n;
 421         size_t xfer_len;
 422
 423         if (hdr->iovec_count > 0) {
 424                 struct sg_iovec sgl;
 425
 426                 for (i = 0; i < hdr->iovec_count; i++) {
 427                         not_copied = copy_from_user(&sgl, hdr->dxferp +
 428                                                 i * sizeof(struct sg_iovec),
 429                                                 sizeof(struct sg_iovec));
 430                         if (not_copied)
 431                                 return -EFAULT;
 432                         xfer_len = min(remaining, sgl.iov_len);
 433                         not_copied = copy_from_user(index, sgl.iov_base,
 434                                                                 xfer_len);
 435                         if (not_copied) {
 436                                 res = -EFAULT;
 437                                 break;
 438                         }
 439                         index += xfer_len;
 440                         remaining -= xfer_len;
 441                         if (remaining == 0)
 442                                 break;
 443                 }
 444                 return res;
 445         }
 446
 447         not_copied = copy_from_user(to, hdr->dxferp, n);
 448         if (not_copied)
 449                 res = -EFAULT;
 450         return res;
 451 }
 452
 453 /* Status/Sense Buffer Writeback */
 454
 455 static int nvme_trans_completion(struct sg_io_hdr *hdr, u8 status, u8 sense_key,
 456                                  u8 asc, u8 ascq)
 457 {
 458         int res = SNTI_TRANSLATION_SUCCESS;
 459         u8 xfer_len;
 460         u8 resp[DESC_FMT_SENSE_DATA_SIZE];
 461
 462         if (scsi_status_is_good(status)) {
 463                 hdr->status = SAM_STAT_GOOD;
 464                 hdr->masked_status = GOOD;
 465                 hdr->host_status = DID_OK;
 466                 hdr->driver_status = DRIVER_OK;
 467                 hdr->sb_len_wr = 0;
 468         } else {
 469                 hdr->status = status;
 470                 hdr->masked_status = status >> 1;
 471                 hdr->host_status = DID_OK;
 472                 hdr->driver_status = DRIVER_OK;
 473
 474                 memset(resp, 0, DESC_FMT_SENSE_DATA_SIZE);
 475                 resp[0] = DESC_FORMAT_SENSE_DATA;
 476                 resp[1] = sense_key;
 477                 resp[2] = asc;
 478                 resp[3] = ascq;
 479
 480                 xfer_len = min_t(u8, hdr->mx_sb_len, DESC_FMT_SENSE_DATA_SIZE);
 481                 hdr->sb_len_wr = xfer_len;
 482                 if (copy_to_user(hdr->sbp, resp, xfer_len) > 0)
 483                         res = -EFAULT;
 484         }
 485
 486         return res;
 487 }
 488
 489 static int nvme_trans_status_code(struct sg_io_hdr *hdr, int nvme_sc)
 490 {
 491         u8 status, sense_key, asc, ascq;
 492         int res = SNTI_TRANSLATION_SUCCESS;
 493
 494         /* For non-nvme (Linux) errors, simply return the error code */
 495         if (nvme_sc < 0)
 496                 return nvme_sc;
 497
 498         /* Mask DNR, More, and reserved fields */
 499         nvme_sc &= 0x7FF;
 500
 501         switch (nvme_sc) {
 502         /* Generic Command Status */
 503         case NVME_SC_SUCCESS:
 504                 status = SAM_STAT_GOOD;
 505                 sense_key = NO_SENSE;
 506                 asc = SCSI_ASC_NO_SENSE;
 507                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 508                 break;
 509         case NVME_SC_INVALID_OPCODE:
 510                 status = SAM_STAT_CHECK_CONDITION;
 511                 sense_key = ILLEGAL_REQUEST;
 512                 asc = SCSI_ASC_ILLEGAL_COMMAND;
 513                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 514                 break;
 515         case NVME_SC_INVALID_FIELD:
 516                 status = SAM_STAT_CHECK_CONDITION;
 517                 sense_key = ILLEGAL_REQUEST;
 518                 asc = SCSI_ASC_INVALID_CDB;
 519                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 520                 break;
 521         case NVME_SC_DATA_XFER_ERROR:
 522                 status = SAM_STAT_CHECK_CONDITION;
 523                 sense_key = MEDIUM_ERROR;
 524                 asc = SCSI_ASC_NO_SENSE;
 525                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 526                 break;
 527         case NVME_SC_POWER_LOSS:
 528                 status = SAM_STAT_TASK_ABORTED;
 529                 sense_key = ABORTED_COMMAND;
 530                 asc = SCSI_ASC_WARNING;
 531                 ascq = SCSI_ASCQ_POWER_LOSS_EXPECTED;
 532                 break;
 533         case NVME_SC_INTERNAL:
 534                 status = SAM_STAT_CHECK_CONDITION;
 535                 sense_key = HARDWARE_ERROR;
 536                 asc = SCSI_ASC_INTERNAL_TARGET_FAILURE;
 537                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 538                 break;
 539         case NVME_SC_ABORT_REQ:
 540                 status = SAM_STAT_TASK_ABORTED;
 541                 sense_key = ABORTED_COMMAND;
 542                 asc = SCSI_ASC_NO_SENSE;
 543                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 544                 break;
 545         case NVME_SC_ABORT_QUEUE:
 546                 status = SAM_STAT_TASK_ABORTED;
 547                 sense_key = ABORTED_COMMAND;
 548                 asc = SCSI_ASC_NO_SENSE;
 549                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 550                 break;
 551         case NVME_SC_FUSED_FAIL:
 552                 status = SAM_STAT_TASK_ABORTED;
 553                 sense_key = ABORTED_COMMAND;
 554                 asc = SCSI_ASC_NO_SENSE;
 555                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 556                 break;
 557         case NVME_SC_FUSED_MISSING:
 558                 status = SAM_STAT_TASK_ABORTED;
 559                 sense_key = ABORTED_COMMAND;
 560                 asc = SCSI_ASC_NO_SENSE;
 561                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 562                 break;
 563         case NVME_SC_INVALID_NS:
 564                 status = SAM_STAT_CHECK_CONDITION;
 565                 sense_key = ILLEGAL_REQUEST;
 566                 asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
 567                 ascq = SCSI_ASCQ_INVALID_LUN_ID;
 568                 break;
 569         case NVME_SC_LBA_RANGE:
 570                 status = SAM_STAT_CHECK_CONDITION;
 571                 sense_key = ILLEGAL_REQUEST;
 572                 asc = SCSI_ASC_ILLEGAL_BLOCK;
 573                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 574                 break;
 575         case NVME_SC_CAP_EXCEEDED:
 576                 status = SAM_STAT_CHECK_CONDITION;
 577                 sense_key = MEDIUM_ERROR;
 578                 asc = SCSI_ASC_NO_SENSE;
 579                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 580                 break;
 581         case NVME_SC_NS_NOT_READY:
 582                 status = SAM_STAT_CHECK_CONDITION;
 583                 sense_key = NOT_READY;
 584                 asc = SCSI_ASC_LUN_NOT_READY;
 585                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 586                 break;
 587
 588         /* Command Specific Status */
 589         case NVME_SC_INVALID_FORMAT:
 590                 status = SAM_STAT_CHECK_CONDITION;
 591                 sense_key = ILLEGAL_REQUEST;
 592                 asc = SCSI_ASC_FORMAT_COMMAND_FAILED;
 593                 ascq = SCSI_ASCQ_FORMAT_COMMAND_FAILED;
 594                 break;
 595         case NVME_SC_BAD_ATTRIBUTES:
 596                 status = SAM_STAT_CHECK_CONDITION;
 597                 sense_key = ILLEGAL_REQUEST;
 598                 asc = SCSI_ASC_INVALID_CDB;
 599                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 600                 break;
 601
 602         /* Media Errors */
 603         case NVME_SC_WRITE_FAULT:
 604                 status = SAM_STAT_CHECK_CONDITION;
 605                 sense_key = MEDIUM_ERROR;
 606                 asc = SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT;
 607                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 608                 break;
 609         case NVME_SC_READ_ERROR:
 610                 status = SAM_STAT_CHECK_CONDITION;
 611                 sense_key = MEDIUM_ERROR;
 612                 asc = SCSI_ASC_UNRECOVERED_READ_ERROR;
 613                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 614                 break;
 615         case NVME_SC_GUARD_CHECK:
 616                 status = SAM_STAT_CHECK_CONDITION;
 617                 sense_key = MEDIUM_ERROR;
 618                 asc = SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED;
 619                 ascq = SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED;
 620                 break;
 621         case NVME_SC_APPTAG_CHECK:
 622                 status = SAM_STAT_CHECK_CONDITION;
 623                 sense_key = MEDIUM_ERROR;
 624                 asc = SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED;
 625                 ascq = SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED;
 626                 break;
 627         case NVME_SC_REFTAG_CHECK:
 628                 status = SAM_STAT_CHECK_CONDITION;
 629                 sense_key = MEDIUM_ERROR;
 630                 asc = SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED;
 631                 ascq = SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED;
 632                 break;
 633         case NVME_SC_COMPARE_FAILED:
 634                 status = SAM_STAT_CHECK_CONDITION;
 635                 sense_key = MISCOMPARE;
 636                 asc = SCSI_ASC_MISCOMPARE_DURING_VERIFY;
 637                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 638                 break;
 639         case NVME_SC_ACCESS_DENIED:
 640                 status = SAM_STAT_CHECK_CONDITION;
 641                 sense_key = ILLEGAL_REQUEST;
 642                 asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
 643                 ascq = SCSI_ASCQ_INVALID_LUN_ID;
 644                 break;
 645
 646         /* Unspecified/Default */
 647         case NVME_SC_CMDID_CONFLICT:
 648         case NVME_SC_CMD_SEQ_ERROR:
 649         case NVME_SC_CQ_INVALID:
 650         case NVME_SC_QID_INVALID:
 651         case NVME_SC_QUEUE_SIZE:
 652         case NVME_SC_ABORT_LIMIT:
 653         case NVME_SC_ABORT_MISSING:
 654         case NVME_SC_ASYNC_LIMIT:
 655         case NVME_SC_FIRMWARE_SLOT:
 656         case NVME_SC_FIRMWARE_IMAGE:
 657         case NVME_SC_INVALID_VECTOR:
 658         case NVME_SC_INVALID_LOG_PAGE:
 659         default:
 660                 status = SAM_STAT_CHECK_CONDITION;
 661                 sense_key = ILLEGAL_REQUEST;
 662                 asc = SCSI_ASC_NO_SENSE;
 663                 ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
 664                 break;
 665         }
 666
 667         res = nvme_trans_completion(hdr, status, sense_key, asc, ascq);
 668
 669         return res;
 670 }
 671
 672 /* INQUIRY Helper Functions */
 673
 674 static int nvme_trans_standard_inquiry_page(struct nvme_ns *ns,
 675                                         struct sg_io_hdr *hdr, u8 *inq_response,
 676                                         int alloc_len)
 677 {
 678         struct nvme_dev *dev = ns->dev;
 679         dma_addr_t dma_addr;
 680         void *mem;
 681         struct nvme_id_ns *id_ns;
 682         int res = SNTI_TRANSLATION_SUCCESS;
 683         int nvme_sc;
 684         int xfer_len;
 685         u8 resp_data_format = 0x02;
 686         u8 protect;
 687         u8 cmdque = 0x01 << 1;
 688
 689         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
 690                                 &dma_addr, GFP_KERNEL);
 691         if (mem == NULL) {
 692                 res = -ENOMEM;
 693                 goto out_dma;
 694         }
 695
 696         /* nvme ns identify - use DPS value for PROTECT field */
 697         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
 698         res = nvme_trans_status_code(hdr, nvme_sc);
 699         /*
 700          * If nvme_sc was -ve, res will be -ve here.
 701          * If nvme_sc was +ve, the status would bace been translated, and res
 702          *  can only be 0 or -ve.
 703          *    - If 0 && nvme_sc > 0, then go into next if where res gets nvme_sc
 704          *    - If -ve, return because its a Linux error.
 705          */
 706         if (res)
 707                 goto out_free;
 708         if (nvme_sc) {
 709                 res = nvme_sc;
 710                 goto out_free;
 711         }
 712         id_ns = mem;
 713         (id_ns->dps) ? (protect = 0x01) : (protect = 0);
 714
 715         memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
 716         inq_response[2] = VERSION_SPC_4;
 717         inq_response[3] = resp_data_format;     /*normaca=0 | hisup=0 */
 718         inq_response[4] = ADDITIONAL_STD_INQ_LENGTH;
 719         inq_response[5] = protect;      /* sccs=0 | acc=0 | tpgs=0 | pc3=0 */
 720         inq_response[7] = cmdque;       /* wbus16=0 | sync=0 | vs=0 */
 721         strncpy(&inq_response[8], "NVMe    ", 8);
 722         strncpy(&inq_response[16], dev->model, 16);
 723         strncpy(&inq_response[32], dev->firmware_rev, 4);
 724
 725         xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
 726         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 727
 728  out_free:
 729         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
 730                           dma_addr);
 731  out_dma:
 732         return res;
 733 }
 734
 735 static int nvme_trans_supported_vpd_pages(struct nvme_ns *ns,
 736                                         struct sg_io_hdr *hdr, u8 *inq_response,
 737                                         int alloc_len)
 738 {
 739         int res = SNTI_TRANSLATION_SUCCESS;
 740         int xfer_len;
 741
 742         memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
 743         inq_response[1] = INQ_SUPPORTED_VPD_PAGES_PAGE;   /* Page Code */
 744         inq_response[3] = INQ_NUM_SUPPORTED_VPD_PAGES;    /* Page Length */
 745         inq_response[4] = INQ_SUPPORTED_VPD_PAGES_PAGE;
 746         inq_response[5] = INQ_UNIT_SERIAL_NUMBER_PAGE;
 747         inq_response[6] = INQ_DEVICE_IDENTIFICATION_PAGE;
 748         inq_response[7] = INQ_EXTENDED_INQUIRY_DATA_PAGE;
 749         inq_response[8] = INQ_BDEV_CHARACTERISTICS_PAGE;
 750
 751         xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
 752         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 753
 754         return res;
 755 }
 756
 757 static int nvme_trans_unit_serial_page(struct nvme_ns *ns,
 758                                         struct sg_io_hdr *hdr, u8 *inq_response,
 759                                         int alloc_len)
 760 {
 761         struct nvme_dev *dev = ns->dev;
 762         int res = SNTI_TRANSLATION_SUCCESS;
 763         int xfer_len;
 764
 765         memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
 766         inq_response[1] = INQ_UNIT_SERIAL_NUMBER_PAGE; /* Page Code */
 767         inq_response[3] = INQ_SERIAL_NUMBER_LENGTH;    /* Page Length */
 768         strncpy(&inq_response[4], dev->serial, INQ_SERIAL_NUMBER_LENGTH);
 769
 770         xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
 771         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 772
 773         return res;
 774 }
 775
 776 static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 777                                         u8 *inq_response, int alloc_len)
 778 {
 779         struct nvme_dev *dev = ns->dev;
 780         dma_addr_t dma_addr;
 781         void *mem;
 782         struct nvme_id_ctrl *id_ctrl;
 783         int res = SNTI_TRANSLATION_SUCCESS;
 784         int nvme_sc;
 785         u8 ieee[4];
 786         int xfer_len;
 787         __be32 tmp_id = cpu_to_be32(ns->ns_id);
 788
 789         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
 790                                         &dma_addr, GFP_KERNEL);
 791         if (mem == NULL) {
 792                 res = -ENOMEM;
 793                 goto out_dma;
 794         }
 795
 796         /* nvme controller identify */
 797         nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
 798         res = nvme_trans_status_code(hdr, nvme_sc);
 799         if (res)
 800                 goto out_free;
 801         if (nvme_sc) {
 802                 res = nvme_sc;
 803                 goto out_free;
 804         }
 805         id_ctrl = mem;
 806
 807         /* Since SCSI tried to save 4 bits... [SPC-4(r34) Table 591] */
 808         ieee[0] = id_ctrl->ieee[0] << 4;
 809         ieee[1] = id_ctrl->ieee[0] >> 4 | id_ctrl->ieee[1] << 4;
 810         ieee[2] = id_ctrl->ieee[1] >> 4 | id_ctrl->ieee[2] << 4;
 811         ieee[3] = id_ctrl->ieee[2] >> 4;
 812
 813         memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
 814         inq_response[1] = INQ_DEVICE_IDENTIFICATION_PAGE;    /* Page Code */
 815         inq_response[3] = 20;      /* Page Length */
 816         /* Designation Descriptor start */
 817         inq_response[4] = 0x01;    /* Proto ID=0h | Code set=1h */
 818         inq_response[5] = 0x03;    /* PIV=0b | Asso=00b | Designator Type=3h */
 819         inq_response[6] = 0x00;    /* Rsvd */
 820         inq_response[7] = 16;      /* Designator Length */
 821         /* Designator start */
 822         inq_response[8] = 0x60 | ieee[3]; /* NAA=6h | IEEE ID MSB, High nibble*/
 823         inq_response[9] = ieee[2];        /* IEEE ID */
 824         inq_response[10] = ieee[1];       /* IEEE ID */
 825         inq_response[11] = ieee[0];       /* IEEE ID| Vendor Specific ID... */
 826         inq_response[12] = (dev->pci_dev->vendor & 0xFF00) >> 8;
 827         inq_response[13] = (dev->pci_dev->vendor & 0x00FF);
 828         inq_response[14] = dev->serial[0];
 829         inq_response[15] = dev->serial[1];
 830         inq_response[16] = dev->model[0];
 831         inq_response[17] = dev->model[1];
 832         memcpy(&inq_response[18], &tmp_id, sizeof(u32));
 833         /* Last 2 bytes are zero */
 834
 835         xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
 836         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 837
 838  out_free:
 839         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
 840                           dma_addr);
 841  out_dma:
 842         return res;
 843 }
 844
 845 static int nvme_trans_ext_inq_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 846                                         int alloc_len)
 847 {
 848         u8 *inq_response;
 849         int res = SNTI_TRANSLATION_SUCCESS;
 850         int nvme_sc;
 851         struct nvme_dev *dev = ns->dev;
 852         dma_addr_t dma_addr;
 853         void *mem;
 854         struct nvme_id_ctrl *id_ctrl;
 855         struct nvme_id_ns *id_ns;
 856         int xfer_len;
 857         u8 microcode = 0x80;
 858         u8 spt;
 859         u8 spt_lut[8] = {0, 0, 2, 1, 4, 6, 5, 7};
 860         u8 grd_chk, app_chk, ref_chk, protect;
 861         u8 uask_sup = 0x20;
 862         u8 v_sup;
 863         u8 luiclr = 0x01;
 864
 865         inq_response = kmalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
 866         if (inq_response == NULL) {
 867                 res = -ENOMEM;
 868                 goto out_mem;
 869         }
 870
 871         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
 872                                                         &dma_addr, GFP_KERNEL);
 873         if (mem == NULL) {
 874                 res = -ENOMEM;
 875                 goto out_dma;
 876         }
 877
 878         /* nvme ns identify */
 879         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
 880         res = nvme_trans_status_code(hdr, nvme_sc);
 881         if (res)
 882                 goto out_free;
 883         if (nvme_sc) {
 884                 res = nvme_sc;
 885                 goto out_free;
 886         }
 887         id_ns = mem;
 888         spt = spt_lut[(id_ns->dpc) & 0x07] << 3;
 889         (id_ns->dps) ? (protect = 0x01) : (protect = 0);
 890         grd_chk = protect << 2;
 891         app_chk = protect << 1;
 892         ref_chk = protect;
 893
 894         /* nvme controller identify */
 895         nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
 896         res = nvme_trans_status_code(hdr, nvme_sc);
 897         if (res)
 898                 goto out_free;
 899         if (nvme_sc) {
 900                 res = nvme_sc;
 901                 goto out_free;
 902         }
 903         id_ctrl = mem;
 904         v_sup = id_ctrl->vwc;
 905
 906         memset(inq_response, 0, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 907         inq_response[1] = INQ_EXTENDED_INQUIRY_DATA_PAGE;    /* Page Code */
 908         inq_response[2] = 0x00;    /* Page Length MSB */
 909         inq_response[3] = 0x3C;    /* Page Length LSB */
 910         inq_response[4] = microcode | spt | grd_chk | app_chk | ref_chk;
 911         inq_response[5] = uask_sup;
 912         inq_response[6] = v_sup;
 913         inq_response[7] = luiclr;
 914         inq_response[8] = 0;
 915         inq_response[9] = 0;
 916
 917         xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 918         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 919
 920  out_free:
 921         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
 922                           dma_addr);
 923  out_dma:
 924         kfree(inq_response);
 925  out_mem:
 926         return res;
 927 }
 928
 929 static int nvme_trans_bdev_char_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 930                                         int alloc_len)
 931 {
 932         u8 *inq_response;
 933         int res = SNTI_TRANSLATION_SUCCESS;
 934         int xfer_len;
 935
 936         inq_response = kmalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
 937         if (inq_response == NULL) {
 938                 res = -ENOMEM;
 939                 goto out_mem;
 940         }
 941
 942         memset(inq_response, 0, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 943         inq_response[1] = INQ_BDEV_CHARACTERISTICS_PAGE;    /* Page Code */
 944         inq_response[2] = 0x00;    /* Page Length MSB */
 945         inq_response[3] = 0x3C;    /* Page Length LSB */
 946         inq_response[4] = 0x00;    /* Medium Rotation Rate MSB */
 947         inq_response[5] = 0x01;    /* Medium Rotation Rate LSB */
 948         inq_response[6] = 0x00;    /* Form Factor */
 949
 950         xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 951         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 952
 953         kfree(inq_response);
 954  out_mem:
 955         return res;
 956 }
 957
 958 /* LOG SENSE Helper Functions */
 959
 960 static int nvme_trans_log_supp_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 961                                         int alloc_len)
 962 {
 963         int res = SNTI_TRANSLATION_SUCCESS;
 964         int xfer_len;
 965         u8 *log_response;
 966
 967         log_response = kmalloc(LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH, GFP_KERNEL);
 968         if (log_response == NULL) {
 969                 res = -ENOMEM;
 970                 goto out_mem;
 971         }
 972         memset(log_response, 0, LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH);
 973
 974         log_response[0] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
 975         /* Subpage=0x00, Page Length MSB=0 */
 976         log_response[3] = SUPPORTED_LOG_PAGES_PAGE_LENGTH;
 977         log_response[4] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
 978         log_response[5] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
 979         log_response[6] = LOG_PAGE_TEMPERATURE_PAGE;
 980
 981         xfer_len = min(alloc_len, LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH);
 982         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
 983
 984         kfree(log_response);
 985  out_mem:
 986         return res;
 987 }
 988
 989 static int nvme_trans_log_info_exceptions(struct nvme_ns *ns,
 990                                         struct sg_io_hdr *hdr, int alloc_len)
 991 {
 992         int res = SNTI_TRANSLATION_SUCCESS;
 993         int xfer_len;
 994         u8 *log_response;
 995         struct nvme_command c;
 996         struct nvme_dev *dev = ns->dev;
 997         struct nvme_smart_log *smart_log;
 998         dma_addr_t dma_addr;
 999         void *mem;
1000         u8 temp_c;
1001         u16 temp_k;
1002
1003         log_response = kmalloc(LOG_INFO_EXCP_PAGE_LENGTH, GFP_KERNEL);
1004         if (log_response == NULL) {
1005                 res = -ENOMEM;
1006                 goto out_mem;
1007         }
1008         memset(log_response, 0, LOG_INFO_EXCP_PAGE_LENGTH);
1009
1010         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1011                                         sizeof(struct nvme_smart_log),
1012                                         &dma_addr, GFP_KERNEL);
1013         if (mem == NULL) {
1014                 res = -ENOMEM;
1015                 goto out_dma;
1016         }
1017
1018         /* Get SMART Log Page */
1019         memset(&c, 0, sizeof(c));
1020         c.common.opcode = nvme_admin_get_log_page;
1021         c.common.nsid = cpu_to_le32(0xFFFFFFFF);
1022         c.common.prp1 = cpu_to_le64(dma_addr);
1023         c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
1024                         BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
1025         res = nvme_submit_admin_cmd(dev, &c, NULL);
1026         if (res != NVME_SC_SUCCESS) {
1027                 temp_c = LOG_TEMP_UNKNOWN;
1028         } else {
1029                 smart_log = mem;
1030                 temp_k = (smart_log->temperature[1] << 8) +
1031                                 (smart_log->temperature[0]);
1032                 temp_c = temp_k - KELVIN_TEMP_FACTOR;
1033         }
1034
1035         log_response[0] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
1036         /* Subpage=0x00, Page Length MSB=0 */
1037         log_response[3] = REMAINING_INFO_EXCP_PAGE_LENGTH;
1038         /* Informational Exceptions Log Parameter 1 Start */
1039         /* Parameter Code=0x0000 bytes 4,5 */
1040         log_response[6] = 0x23; /* DU=0, TSD=1, ETC=0, TMC=0, FMT_AND_LNK=11b */
1041         log_response[7] = 0x04; /* PARAMETER LENGTH */
1042         /* Add sense Code and qualifier = 0x00 each */
1043         /* Use Temperature from NVMe Get Log Page, convert to C from K */
1044         log_response[10] = temp_c;
1045
1046         xfer_len = min(alloc_len, LOG_INFO_EXCP_PAGE_LENGTH);
1047         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
1048
1049         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
1050                           mem, dma_addr);
1051  out_dma:
1052         kfree(log_response);
1053  out_mem:
1054         return res;
1055 }
1056
1057 static int nvme_trans_log_temperature(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1058                                         int alloc_len)
1059 {
1060         int res = SNTI_TRANSLATION_SUCCESS;
1061         int xfer_len;
1062         u8 *log_response;
1063         struct nvme_command c;
1064         struct nvme_dev *dev = ns->dev;
1065         struct nvme_smart_log *smart_log;
1066         dma_addr_t dma_addr;
1067         void *mem;
1068         u32 feature_resp;
1069         u8 temp_c_cur, temp_c_thresh;
1070         u16 temp_k;
1071
1072         log_response = kmalloc(LOG_TEMP_PAGE_LENGTH, GFP_KERNEL);
1073         if (log_response == NULL) {
1074                 res = -ENOMEM;
1075                 goto out_mem;
1076         }
1077         memset(log_response, 0, LOG_TEMP_PAGE_LENGTH);
1078
1079         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1080                                         sizeof(struct nvme_smart_log),
1081                                         &dma_addr, GFP_KERNEL);
1082         if (mem == NULL) {
1083                 res = -ENOMEM;
1084                 goto out_dma;
1085         }
1086
1087         /* Get SMART Log Page */
1088         memset(&c, 0, sizeof(c));
1089         c.common.opcode = nvme_admin_get_log_page;
1090         c.common.nsid = cpu_to_le32(0xFFFFFFFF);
1091         c.common.prp1 = cpu_to_le64(dma_addr);
1092         c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
1093                         BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
1094         res = nvme_submit_admin_cmd(dev, &c, NULL);
1095         if (res != NVME_SC_SUCCESS) {
1096                 temp_c_cur = LOG_TEMP_UNKNOWN;
1097         } else {
1098                 smart_log = mem;
1099                 temp_k = (smart_log->temperature[1] << 8) +
1100                                 (smart_log->temperature[0]);
1101                 temp_c_cur = temp_k - KELVIN_TEMP_FACTOR;
1102         }
1103
1104         /* Get Features for Temp Threshold */
1105         res = nvme_get_features(dev, NVME_FEAT_TEMP_THRESH, 0, 0,
1106                                                                 &feature_resp);
1107         if (res != NVME_SC_SUCCESS)
1108                 temp_c_thresh = LOG_TEMP_UNKNOWN;
1109         else
1110                 temp_c_thresh = (feature_resp & 0xFFFF) - KELVIN_TEMP_FACTOR;
1111
1112         log_response[0] = LOG_PAGE_TEMPERATURE_PAGE;
1113         /* Subpage=0x00, Page Length MSB=0 */
1114         log_response[3] = REMAINING_TEMP_PAGE_LENGTH;
1115         /* Temperature Log Parameter 1 (Temperature) Start */
1116         /* Parameter Code = 0x0000 */
1117         log_response[6] = 0x01;         /* Format and Linking = 01b */
1118         log_response[7] = 0x02;         /* Parameter Length */
1119         /* Use Temperature from NVMe Get Log Page, convert to C from K */
1120         log_response[9] = temp_c_cur;
1121         /* Temperature Log Parameter 2 (Reference Temperature) Start */
1122         log_response[11] = 0x01;        /* Parameter Code = 0x0001 */
1123         log_response[12] = 0x01;        /* Format and Linking = 01b */
1124         log_response[13] = 0x02;        /* Parameter Length */
1125         /* Use Temperature Thresh from NVMe Get Log Page, convert to C from K */
1126         log_response[15] = temp_c_thresh;
1127
1128         xfer_len = min(alloc_len, LOG_TEMP_PAGE_LENGTH);
1129         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
1130
1131         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
1132                           mem, dma_addr);
1133  out_dma:
1134         kfree(log_response);
1135  out_mem:
1136         return res;
1137 }
1138
1139 /* MODE SENSE Helper Functions */
1140
1141 static int nvme_trans_fill_mode_parm_hdr(u8 *resp, int len, u8 cdb10, u8 llbaa,
1142                                         u16 mode_data_length, u16 blk_desc_len)
1143 {
1144         /* Quick check to make sure I don't stomp on my own memory... */
1145         if ((cdb10 && len < 8) || (!cdb10 && len < 4))
1146                 return SNTI_INTERNAL_ERROR;
1147
1148         if (cdb10) {
1149                 resp[0] = (mode_data_length & 0xFF00) >> 8;
1150                 resp[1] = (mode_data_length & 0x00FF);
1151                 /* resp[2] and [3] are zero */
1152                 resp[4] = llbaa;
1153                 resp[5] = RESERVED_FIELD;
1154                 resp[6] = (blk_desc_len & 0xFF00) >> 8;
1155                 resp[7] = (blk_desc_len & 0x00FF);
1156         } else {
1157                 resp[0] = (mode_data_length & 0x00FF);
1158                 /* resp[1] and [2] are zero */
1159                 resp[3] = (blk_desc_len & 0x00FF);
1160         }
1161
1162         return SNTI_TRANSLATION_SUCCESS;
1163 }
1164
1165 static int nvme_trans_fill_blk_desc(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1166                                     u8 *resp, int len, u8 llbaa)
1167 {
1168         int res = SNTI_TRANSLATION_SUCCESS;
1169         int nvme_sc;
1170         struct nvme_dev *dev = ns->dev;
1171         dma_addr_t dma_addr;
1172         void *mem;
1173         struct nvme_id_ns *id_ns;
1174         u8 flbas;
1175         u32 lba_length;
1176
1177         if (llbaa == 0 && len < MODE_PAGE_BLK_DES_LEN)
1178                 return SNTI_INTERNAL_ERROR;
1179         else if (llbaa > 0 && len < MODE_PAGE_LLBAA_BLK_DES_LEN)
1180                 return SNTI_INTERNAL_ERROR;
1181
1182         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1183                                                         &dma_addr, GFP_KERNEL);
1184         if (mem == NULL) {
1185                 res = -ENOMEM;
1186                 goto out;
1187         }
1188
1189         /* nvme ns identify */
1190         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1191         res = nvme_trans_status_code(hdr, nvme_sc);
1192         if (res)
1193                 goto out_dma;
1194         if (nvme_sc) {
1195                 res = nvme_sc;
1196                 goto out_dma;
1197         }
1198         id_ns = mem;
1199         flbas = (id_ns->flbas) & 0x0F;
1200         lba_length = (1 << (id_ns->lbaf[flbas].ds));
1201
1202         if (llbaa == 0) {
1203                 __be32 tmp_cap = cpu_to_be32(le64_to_cpu(id_ns->ncap));
1204                 /* Byte 4 is reserved */
1205                 __be32 tmp_len = cpu_to_be32(lba_length & 0x00FFFFFF);
1206
1207                 memcpy(resp, &tmp_cap, sizeof(u32));
1208                 memcpy(&resp[4], &tmp_len, sizeof(u32));
1209         } else {
1210                 __be64 tmp_cap = cpu_to_be64(le64_to_cpu(id_ns->ncap));
1211                 __be32 tmp_len = cpu_to_be32(lba_length);
1212
1213                 memcpy(resp, &tmp_cap, sizeof(u64));
1214                 /* Bytes 8, 9, 10, 11 are reserved */
1215                 memcpy(&resp[12], &tmp_len, sizeof(u32));
1216         }
1217
1218  out_dma:
1219         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
1220                           dma_addr);
1221  out:
1222         return res;
1223 }
1224
1225 static int nvme_trans_fill_control_page(struct nvme_ns *ns,
1226                                         struct sg_io_hdr *hdr, u8 *resp,
1227                                         int len)
1228 {
1229         if (len < MODE_PAGE_CONTROL_LEN)
1230                 return SNTI_INTERNAL_ERROR;
1231
1232         resp[0] = MODE_PAGE_CONTROL;
1233         resp[1] = MODE_PAGE_CONTROL_LEN_FIELD;
1234         resp[2] = 0x0E;         /* TST=000b, TMF_ONLY=0, DPICZ=1,
1235                                  * D_SENSE=1, GLTSD=1, RLEC=0 */
1236         resp[3] = 0x12;         /* Q_ALGO_MODIFIER=1h, NUAR=0, QERR=01b */
1237         /* Byte 4:  VS=0, RAC=0, UA_INT=0, SWP=0 */
1238         resp[5] = 0x40;         /* ATO=0, TAS=1, ATMPE=0, RWWP=0, AUTOLOAD=0 */
1239         /* resp[6] and [7] are obsolete, thus zero */
1240         resp[8] = 0xFF;         /* Busy timeout period = 0xffff */
1241         resp[9] = 0xFF;
1242         /* Bytes 10,11: Extended selftest completion time = 0x0000 */
1243
1244         return SNTI_TRANSLATION_SUCCESS;
1245 }
1246
1247 static int nvme_trans_fill_caching_page(struct nvme_ns *ns,
1248                                         struct sg_io_hdr *hdr,
1249                                         u8 *resp, int len)
1250 {
1251         int res = SNTI_TRANSLATION_SUCCESS;
1252         int nvme_sc;
1253         struct nvme_dev *dev = ns->dev;
1254         u32 feature_resp;
1255         u8 vwc;
1256
1257         if (len < MODE_PAGE_CACHING_LEN)
1258                 return SNTI_INTERNAL_ERROR;
1259
1260         nvme_sc = nvme_get_features(dev, NVME_FEAT_VOLATILE_WC, 0, 0,
1261                                                                 &feature_resp);
1262         res = nvme_trans_status_code(hdr, nvme_sc);
1263         if (res)
1264                 goto out;
1265         if (nvme_sc) {
1266                 res = nvme_sc;
1267                 goto out;
1268         }
1269         vwc = feature_resp & 0x00000001;
1270
1271         resp[0] = MODE_PAGE_CACHING;
1272         resp[1] = MODE_PAGE_CACHING_LEN_FIELD;
1273         resp[2] = vwc << 2;
1274
1275  out:
1276         return res;
1277 }
1278
1279 static int nvme_trans_fill_pow_cnd_page(struct nvme_ns *ns,
1280                                         struct sg_io_hdr *hdr, u8 *resp,
1281                                         int len)
1282 {
1283         int res = SNTI_TRANSLATION_SUCCESS;
1284
1285         if (len < MODE_PAGE_POW_CND_LEN)
1286                 return SNTI_INTERNAL_ERROR;
1287
1288         resp[0] = MODE_PAGE_POWER_CONDITION;
1289         resp[1] = MODE_PAGE_POW_CND_LEN_FIELD;
1290         /* All other bytes are zero */
1291
1292         return res;
1293 }
1294
1295 static int nvme_trans_fill_inf_exc_page(struct nvme_ns *ns,
1296                                         struct sg_io_hdr *hdr, u8 *resp,
1297                                         int len)
1298 {
1299         int res = SNTI_TRANSLATION_SUCCESS;
1300
1301         if (len < MODE_PAGE_INF_EXC_LEN)
1302                 return SNTI_INTERNAL_ERROR;
1303
1304         resp[0] = MODE_PAGE_INFO_EXCEP;
1305         resp[1] = MODE_PAGE_INF_EXC_LEN_FIELD;
1306         resp[2] = 0x88;
1307         /* All other bytes are zero */
1308
1309         return res;
1310 }
1311
1312 static int nvme_trans_fill_all_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1313                                      u8 *resp, int len)
1314 {
1315         int res = SNTI_TRANSLATION_SUCCESS;
1316         u16 mode_pages_offset_1 = 0;
1317         u16 mode_pages_offset_2, mode_pages_offset_3, mode_pages_offset_4;
1318
1319         mode_pages_offset_2 = mode_pages_offset_1 + MODE_PAGE_CACHING_LEN;
1320         mode_pages_offset_3 = mode_pages_offset_2 + MODE_PAGE_CONTROL_LEN;
1321         mode_pages_offset_4 = mode_pages_offset_3 + MODE_PAGE_POW_CND_LEN;
1322
1323         res = nvme_trans_fill_caching_page(ns, hdr, &resp[mode_pages_offset_1],
1324                                         MODE_PAGE_CACHING_LEN);
1325         if (res != SNTI_TRANSLATION_SUCCESS)
1326                 goto out;
1327         res = nvme_trans_fill_control_page(ns, hdr, &resp[mode_pages_offset_2],
1328                                         MODE_PAGE_CONTROL_LEN);
1329         if (res != SNTI_TRANSLATION_SUCCESS)
1330                 goto out;
1331         res = nvme_trans_fill_pow_cnd_page(ns, hdr, &resp[mode_pages_offset_3],
1332                                         MODE_PAGE_POW_CND_LEN);
1333         if (res != SNTI_TRANSLATION_SUCCESS)
1334                 goto out;
1335         res = nvme_trans_fill_inf_exc_page(ns, hdr, &resp[mode_pages_offset_4],
1336                                         MODE_PAGE_INF_EXC_LEN);
1337         if (res != SNTI_TRANSLATION_SUCCESS)
1338                 goto out;
1339
1340  out:
1341         return res;
1342 }
1343
1344 static inline int nvme_trans_get_blk_desc_len(u8 dbd, u8 llbaa)
1345 {
1346         if (dbd == MODE_SENSE_BLK_DESC_ENABLED) {
1347                 /* SPC-4: len = 8 x Num_of_descriptors if llbaa = 0, 16x if 1 */
1348                 return 8 * (llbaa + 1) * MODE_SENSE_BLK_DESC_COUNT;
1349         } else {
1350                 return 0;
1351         }
1352 }
1353
1354 static int nvme_trans_mode_page_create(struct nvme_ns *ns,
1355                                         struct sg_io_hdr *hdr, u8 *cmd,
1356                                         u16 alloc_len, u8 cdb10,
1357                                         int (*mode_page_fill_func)
1358                                         (struct nvme_ns *,
1359                                         struct sg_io_hdr *hdr, u8 *, int),
1360                                         u16 mode_pages_tot_len)
1361 {
1362         int res = SNTI_TRANSLATION_SUCCESS;
1363         int xfer_len;
1364         u8 *response;
1365         u8 dbd, llbaa;
1366         u16 resp_size;
1367         int mph_size;
1368         u16 mode_pages_offset_1;
1369         u16 blk_desc_len, blk_desc_offset, mode_data_length;
1370
1371         dbd = GET_MODE_SENSE_DBD(cmd);
1372         llbaa = GET_MODE_SENSE_LLBAA(cmd);
1373         mph_size = GET_MODE_SENSE_MPH_SIZE(cdb10);
1374         blk_desc_len = nvme_trans_get_blk_desc_len(dbd, llbaa);
1375
1376         resp_size = mph_size + blk_desc_len + mode_pages_tot_len;
1377         /* Refer spc4r34 Table 440 for calculation of Mode data Length field */
1378         mode_data_length = 3 + (3 * cdb10) + blk_desc_len + mode_pages_tot_len;
1379
1380         blk_desc_offset = mph_size;
1381         mode_pages_offset_1 = blk_desc_offset + blk_desc_len;
1382
1383         response = kmalloc(resp_size, GFP_KERNEL);
1384         if (response == NULL) {
1385                 res = -ENOMEM;
1386                 goto out_mem;
1387         }
1388         memset(response, 0, resp_size);
1389
1390         res = nvme_trans_fill_mode_parm_hdr(&response[0], mph_size, cdb10,
1391                                         llbaa, mode_data_length, blk_desc_len);
1392         if (res != SNTI_TRANSLATION_SUCCESS)
1393                 goto out_free;
1394         if (blk_desc_len > 0) {
1395                 res = nvme_trans_fill_blk_desc(ns, hdr,
1396                                                &response[blk_desc_offset],
1397                                                blk_desc_len, llbaa);
1398                 if (res != SNTI_TRANSLATION_SUCCESS)
1399                         goto out_free;
1400         }
1401         res = mode_page_fill_func(ns, hdr, &response[mode_pages_offset_1],
1402                                         mode_pages_tot_len);
1403         if (res != SNTI_TRANSLATION_SUCCESS)
1404                 goto out_free;
1405
1406         xfer_len = min(alloc_len, resp_size);
1407         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
1408
1409  out_free:
1410         kfree(response);
1411  out_mem:
1412         return res;
1413 }
1414
1415 /* Read Capacity Helper Functions */
1416
1417 static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
1418                                                                 u8 cdb16)
1419 {
1420         u8 flbas;
1421         u32 lba_length;
1422         u64 rlba;
1423         u8 prot_en;
1424         u8 p_type_lut[4] = {0, 0, 1, 2};
1425         __be64 tmp_rlba;
1426         __be32 tmp_rlba_32;
1427         __be32 tmp_len;
1428
1429         flbas = (id_ns->flbas) & 0x0F;
1430         lba_length = (1 << (id_ns->lbaf[flbas].ds));
1431         rlba = le64_to_cpup(&id_ns->nsze) - 1;
1432         (id_ns->dps) ? (prot_en = 0x01) : (prot_en = 0);
1433
1434         if (!cdb16) {
1435                 if (rlba > 0xFFFFFFFF)
1436                         rlba = 0xFFFFFFFF;
1437                 tmp_rlba_32 = cpu_to_be32(rlba);
1438                 tmp_len = cpu_to_be32(lba_length);
1439                 memcpy(response, &tmp_rlba_32, sizeof(u32));
1440                 memcpy(&response[4], &tmp_len, sizeof(u32));
1441         } else {
1442                 tmp_rlba = cpu_to_be64(rlba);
1443                 tmp_len = cpu_to_be32(lba_length);
1444                 memcpy(response, &tmp_rlba, sizeof(u64));
1445                 memcpy(&response[8], &tmp_len, sizeof(u32));
1446                 response[12] = (p_type_lut[id_ns->dps & 0x3] << 1) | prot_en;
1447                 /* P_I_Exponent = 0x0 | LBPPBE = 0x0 */
1448                 /* LBPME = 0 | LBPRZ = 0 | LALBA = 0x00 */
1449                 /* Bytes 16-31 - Reserved */
1450         }
1451 }
1452
1453 /* Start Stop Unit Helper Functions */
1454
1455 static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1456                                                 u8 pc, u8 pcmod, u8 start)
1457 {
1458         int res = SNTI_TRANSLATION_SUCCESS;
1459         int nvme_sc;
1460         struct nvme_dev *dev = ns->dev;
1461         dma_addr_t dma_addr;
1462         void *mem;
1463         struct nvme_id_ctrl *id_ctrl;
1464         int lowest_pow_st;      /* max npss = lowest power consumption */
1465         unsigned ps_desired = 0;
1466
1467         /* NVMe Controller Identify */
1468         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1469                                 sizeof(struct nvme_id_ctrl),
1470                                 &dma_addr, GFP_KERNEL);
1471         if (mem == NULL) {
1472                 res = -ENOMEM;
1473                 goto out;
1474         }
1475         nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
1476         res = nvme_trans_status_code(hdr, nvme_sc);
1477         if (res)
1478                 goto out_dma;
1479         if (nvme_sc) {
1480                 res = nvme_sc;
1481                 goto out_dma;
1482         }
1483         id_ctrl = mem;
1484         lowest_pow_st = id_ctrl->npss - 1;
1485
1486         switch (pc) {
1487         case NVME_POWER_STATE_START_VALID:
1488                 /* Action unspecified if POWER CONDITION MODIFIER != 0 */
1489                 if (pcmod == 0 && start == 0x1)
1490                         ps_desired = POWER_STATE_0;
1491                 if (pcmod == 0 && start == 0x0)
1492                         ps_desired = lowest_pow_st;
1493                 break;
1494         case NVME_POWER_STATE_ACTIVE:
1495                 /* Action unspecified if POWER CONDITION MODIFIER != 0 */
1496                 if (pcmod == 0)
1497                         ps_desired = POWER_STATE_0;
1498                 break;
1499         case NVME_POWER_STATE_IDLE:
1500                 /* Action unspecified if POWER CONDITION MODIFIER != [0,1,2] */
1501                 /* min of desired state and (lps-1) because lps is STOP */
1502                 if (pcmod == 0x0)
1503                         ps_desired = min(POWER_STATE_1, (lowest_pow_st - 1));
1504                 else if (pcmod == 0x1)
1505                         ps_desired = min(POWER_STATE_2, (lowest_pow_st - 1));
1506                 else if (pcmod == 0x2)
1507                         ps_desired = min(POWER_STATE_3, (lowest_pow_st - 1));
1508                 break;
1509         case NVME_POWER_STATE_STANDBY:
1510                 /* Action unspecified if POWER CONDITION MODIFIER != [0,1] */
1511                 if (pcmod == 0x0)
1512                         ps_desired = max(0, (lowest_pow_st - 2));
1513                 else if (pcmod == 0x1)
1514                         ps_desired = max(0, (lowest_pow_st - 1));
1515                 break;
1516         case NVME_POWER_STATE_LU_CONTROL:
1517         default:
1518                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1519                                 ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1520                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1521                 break;
1522         }
1523         nvme_sc = nvme_set_features(dev, NVME_FEAT_POWER_MGMT, ps_desired, 0,
1524                                     NULL);
1525         res = nvme_trans_status_code(hdr, nvme_sc);
1526         if (res)
1527                 goto out_dma;
1528         if (nvme_sc)
1529                 res = nvme_sc;
1530  out_dma:
1531         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
1532                           dma_addr);
1533  out:
1534         return res;
1535 }
1536
1537 /* Write Buffer Helper Functions */
1538 /* Also using this for Format Unit with hdr passed as NULL, and buffer_id, 0 */
1539
1540 static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1541                                         u8 opcode, u32 tot_len, u32 offset,
1542                                         u8 buffer_id)
1543 {
1544         int res = SNTI_TRANSLATION_SUCCESS;
1545         int nvme_sc;
1546         struct nvme_dev *dev = ns->dev;
1547         struct nvme_command c;
1548         struct nvme_iod *iod = NULL;
1549         unsigned length;
1550
1551         memset(&c, 0, sizeof(c));
1552         c.common.opcode = opcode;
1553         if (opcode == nvme_admin_download_fw) {
1554                 if (hdr->iovec_count > 0) {
1555                         /* Assuming SGL is not allowed for this command */
1556                         res = nvme_trans_completion(hdr,
1557                                                 SAM_STAT_CHECK_CONDITION,
1558                                                 ILLEGAL_REQUEST,
1559                                                 SCSI_ASC_INVALID_CDB,
1560                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1561                         goto out;
1562                 }
1563                 iod = nvme_map_user_pages(dev, DMA_TO_DEVICE,
1564                                 (unsigned long)hdr->dxferp, tot_len);
1565                 if (IS_ERR(iod)) {
1566                         res = PTR_ERR(iod);
1567                         goto out;
1568                 }
1569                 length = nvme_setup_prps(dev, &c.common, iod, tot_len,
1570                                                                 GFP_KERNEL);
1571                 if (length != tot_len) {
1572                         res = -ENOMEM;
1573                         goto out_unmap;
1574                 }
1575
1576                 c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
1577                 c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
1578         } else if (opcode == nvme_admin_activate_fw) {
1579                 u32 cdw10 = buffer_id | NVME_FWACT_REPL_ACTV;
1580                 c.common.cdw10[0] = cpu_to_le32(cdw10);
1581         }
1582
1583         nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
1584         res = nvme_trans_status_code(hdr, nvme_sc);
1585         if (res)
1586                 goto out_unmap;
1587         if (nvme_sc)
1588                 res = nvme_sc;
1589
1590  out_unmap:
1591         if (opcode == nvme_admin_download_fw) {
1592                 nvme_unmap_user_pages(dev, DMA_TO_DEVICE, iod);
1593                 nvme_free_iod(dev, iod);
1594         }
1595  out:
1596         return res;
1597 }
1598
1599 /* Mode Select Helper Functions */
1600
1601 static inline void nvme_trans_modesel_get_bd_len(u8 *parm_list, u8 cdb10,
1602                                                 u16 *bd_len, u8 *llbaa)
1603 {
1604         if (cdb10) {
1605                 /* 10 Byte CDB */
1606                 *bd_len = (parm_list[MODE_SELECT_10_BD_OFFSET] << 8) +
1607                         parm_list[MODE_SELECT_10_BD_OFFSET + 1];
1608                 *llbaa = parm_list[MODE_SELECT_10_LLBAA_OFFSET] &&
1609                                 MODE_SELECT_10_LLBAA_MASK;
1610         } else {
1611                 /* 6 Byte CDB */
1612                 *bd_len = parm_list[MODE_SELECT_6_BD_OFFSET];
1613         }
1614 }
1615
1616 static void nvme_trans_modesel_save_bd(struct nvme_ns *ns, u8 *parm_list,
1617                                         u16 idx, u16 bd_len, u8 llbaa)
1618 {
1619         u16 bd_num;
1620
1621         bd_num = bd_len / ((llbaa == 0) ?
1622                         SHORT_DESC_BLOCK : LONG_DESC_BLOCK);
1623         /* Store block descriptor info if a FORMAT UNIT comes later */
1624         /* TODO Saving 1st BD info; what to do if multiple BD received? */
1625         if (llbaa == 0) {
1626                 /* Standard Block Descriptor - spc4r34 7.5.5.1 */
1627                 ns->mode_select_num_blocks =
1628                                 (parm_list[idx + 1] << 16) +
1629                                 (parm_list[idx + 2] << 8) +
1630                                 (parm_list[idx + 3]);
1631
1632                 ns->mode_select_block_len =
1633                                 (parm_list[idx + 5] << 16) +
1634                                 (parm_list[idx + 6] << 8) +
1635                                 (parm_list[idx + 7]);
1636         } else {
1637                 /* Long LBA Block Descriptor - sbc3r27 6.4.2.3 */
1638                 ns->mode_select_num_blocks =
1639                                 (((u64)parm_list[idx + 0]) << 56) +
1640                                 (((u64)parm_list[idx + 1]) << 48) +
1641                                 (((u64)parm_list[idx + 2]) << 40) +
1642                                 (((u64)parm_list[idx + 3]) << 32) +
1643                                 (((u64)parm_list[idx + 4]) << 24) +
1644                                 (((u64)parm_list[idx + 5]) << 16) +
1645                                 (((u64)parm_list[idx + 6]) << 8) +
1646                                 ((u64)parm_list[idx + 7]);
1647
1648                 ns->mode_select_block_len =
1649                                 (parm_list[idx + 12] << 24) +
1650                                 (parm_list[idx + 13] << 16) +
1651                                 (parm_list[idx + 14] << 8) +
1652                                 (parm_list[idx + 15]);
1653         }
1654 }
1655
1656 static u16 nvme_trans_modesel_get_mp(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1657                                         u8 *mode_page, u8 page_code)
1658 {
1659         int res = SNTI_TRANSLATION_SUCCESS;
1660         int nvme_sc;
1661         struct nvme_dev *dev = ns->dev;
1662         unsigned dword11;
1663
1664         switch (page_code) {
1665         case MODE_PAGE_CACHING:
1666                 dword11 = ((mode_page[2] & CACHING_MODE_PAGE_WCE_MASK) ? 1 : 0);
1667                 nvme_sc = nvme_set_features(dev, NVME_FEAT_VOLATILE_WC, dword11,
1668                                             0, NULL);
1669                 res = nvme_trans_status_code(hdr, nvme_sc);
1670                 if (res)
1671                         break;
1672                 if (nvme_sc) {
1673                         res = nvme_sc;
1674                         break;
1675                 }
1676                 break;
1677         case MODE_PAGE_CONTROL:
1678                 break;
1679         case MODE_PAGE_POWER_CONDITION:
1680                 /* Verify the OS is not trying to set timers */
1681                 if ((mode_page[2] & 0x01) != 0 || (mode_page[3] & 0x0F) != 0) {
1682                         res = nvme_trans_completion(hdr,
1683                                                 SAM_STAT_CHECK_CONDITION,
1684                                                 ILLEGAL_REQUEST,
1685                                                 SCSI_ASC_INVALID_PARAMETER,
1686                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1687                         if (!res)
1688                                 res = SNTI_INTERNAL_ERROR;
1689                         break;
1690                 }
1691                 break;
1692         default:
1693                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1694                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1695                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1696                 if (!res)
1697                         res = SNTI_INTERNAL_ERROR;
1698                 break;
1699         }
1700
1701         return res;
1702 }
1703
1704 static int nvme_trans_modesel_data(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1705                                         u8 *cmd, u16 parm_list_len, u8 pf,
1706                                         u8 sp, u8 cdb10)
1707 {
1708         int res = SNTI_TRANSLATION_SUCCESS;
1709         u8 *parm_list;
1710         u16 bd_len;
1711         u8 llbaa = 0;
1712         u16 index, saved_index;
1713         u8 page_code;
1714         u16 mp_size;
1715
1716         /* Get parm list from data-in/out buffer */
1717         parm_list = kmalloc(parm_list_len, GFP_KERNEL);
1718         if (parm_list == NULL) {
1719                 res = -ENOMEM;
1720                 goto out;
1721         }
1722
1723         res = nvme_trans_copy_from_user(hdr, parm_list, parm_list_len);
1724         if (res != SNTI_TRANSLATION_SUCCESS)
1725                 goto out_mem;
1726
1727         nvme_trans_modesel_get_bd_len(parm_list, cdb10, &bd_len, &llbaa);
1728         index = (cdb10) ? (MODE_SELECT_10_MPH_SIZE) : (MODE_SELECT_6_MPH_SIZE);
1729
1730         if (bd_len != 0) {
1731                 /* Block Descriptors present, parse */
1732                 nvme_trans_modesel_save_bd(ns, parm_list, index, bd_len, llbaa);
1733                 index += bd_len;
1734         }
1735         saved_index = index;
1736
1737         /* Multiple mode pages may be present; iterate through all */
1738         /* In 1st Iteration, don't do NVME Command, only check for CDB errors */
1739         do {
1740                 page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
1741                 mp_size = parm_list[index + 1] + 2;
1742                 if ((page_code != MODE_PAGE_CACHING) &&
1743                     (page_code != MODE_PAGE_CONTROL) &&
1744                     (page_code != MODE_PAGE_POWER_CONDITION)) {
1745                         res = nvme_trans_completion(hdr,
1746                                                 SAM_STAT_CHECK_CONDITION,
1747                                                 ILLEGAL_REQUEST,
1748                                                 SCSI_ASC_INVALID_CDB,
1749                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1750                         goto out_mem;
1751                 }
1752                 index += mp_size;
1753         } while (index < parm_list_len);
1754
1755         /* In 2nd Iteration, do the NVME Commands */
1756         index = saved_index;
1757         do {
1758                 page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
1759                 mp_size = parm_list[index + 1] + 2;
1760                 res = nvme_trans_modesel_get_mp(ns, hdr, &parm_list[index],
1761                                                                 page_code);
1762                 if (res != SNTI_TRANSLATION_SUCCESS)
1763                         break;
1764                 index += mp_size;
1765         } while (index < parm_list_len);
1766
1767  out_mem:
1768         kfree(parm_list);
1769  out:
1770         return res;
1771 }
1772
1773 /* Format Unit Helper Functions */
1774
1775 static int nvme_trans_fmt_set_blk_size_count(struct nvme_ns *ns,
1776                                              struct sg_io_hdr *hdr)
1777 {
1778         int res = SNTI_TRANSLATION_SUCCESS;
1779         int nvme_sc;
1780         struct nvme_dev *dev = ns->dev;
1781         dma_addr_t dma_addr;
1782         void *mem;
1783         struct nvme_id_ns *id_ns;
1784         u8 flbas;
1785
1786         /*
1787          * SCSI Expects a MODE SELECT would have been issued prior to
1788          * a FORMAT UNIT, and the block size and number would be used
1789          * from the block descriptor in it. If a MODE SELECT had not
1790          * been issued, FORMAT shall use the current values for both.
1791          */
1792
1793         if (ns->mode_select_num_blocks == 0 || ns->mode_select_block_len == 0) {
1794                 mem = dma_alloc_coherent(&dev->pci_dev->dev,
1795                         sizeof(struct nvme_id_ns), &dma_addr, GFP_KERNEL);
1796                 if (mem == NULL) {
1797                         res = -ENOMEM;
1798                         goto out;
1799                 }
1800                 /* nvme ns identify */
1801                 nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1802                 res = nvme_trans_status_code(hdr, nvme_sc);
1803                 if (res)
1804                         goto out_dma;
1805                 if (nvme_sc) {
1806                         res = nvme_sc;
1807                         goto out_dma;
1808                 }
1809                 id_ns = mem;
1810
1811                 if (ns->mode_select_num_blocks == 0)
1812                         ns->mode_select_num_blocks = le64_to_cpu(id_ns->ncap);
1813                 if (ns->mode_select_block_len == 0) {
1814                         flbas = (id_ns->flbas) & 0x0F;
1815                         ns->mode_select_block_len =
1816                                                 (1 << (id_ns->lbaf[flbas].ds));
1817                 }
1818  out_dma:
1819                 dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1820                                   mem, dma_addr);
1821         }
1822  out:
1823         return res;
1824 }
1825
1826 static int nvme_trans_fmt_get_parm_header(struct sg_io_hdr *hdr, u8 len,
1827                                         u8 format_prot_info, u8 *nvme_pf_code)
1828 {
1829         int res = SNTI_TRANSLATION_SUCCESS;
1830         u8 *parm_list;
1831         u8 pf_usage, pf_code;
1832
1833         parm_list = kmalloc(len, GFP_KERNEL);
1834         if (parm_list == NULL) {
1835                 res = -ENOMEM;
1836                 goto out;
1837         }
1838         res = nvme_trans_copy_from_user(hdr, parm_list, len);
1839         if (res != SNTI_TRANSLATION_SUCCESS)
1840                 goto out_mem;
1841
1842         if ((parm_list[FORMAT_UNIT_IMMED_OFFSET] &
1843                                 FORMAT_UNIT_IMMED_MASK) != 0) {
1844                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1845                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1846                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1847                 goto out_mem;
1848         }
1849
1850         if (len == FORMAT_UNIT_LONG_PARM_LIST_LEN &&
1851             (parm_list[FORMAT_UNIT_PROT_INT_OFFSET] & 0x0F) != 0) {
1852                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1853                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1854                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1855                 goto out_mem;
1856         }
1857         pf_usage = parm_list[FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET] &
1858                         FORMAT_UNIT_PROT_FIELD_USAGE_MASK;
1859         pf_code = (pf_usage << 2) | format_prot_info;
1860         switch (pf_code) {
1861         case 0:
1862                 *nvme_pf_code = 0;
1863                 break;
1864         case 2:
1865                 *nvme_pf_code = 1;
1866                 break;
1867         case 3:
1868                 *nvme_pf_code = 2;
1869                 break;
1870         case 7:
1871                 *nvme_pf_code = 3;
1872                 break;
1873         default:
1874                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1875                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1876                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1877                 break;
1878         }
1879
1880  out_mem:
1881         kfree(parm_list);
1882  out:
1883         return res;
1884 }
1885
1886 static int nvme_trans_fmt_send_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1887                                    u8 prot_info)
1888 {
1889         int res = SNTI_TRANSLATION_SUCCESS;
1890         int nvme_sc;
1891         struct nvme_dev *dev = ns->dev;
1892         dma_addr_t dma_addr;
1893         void *mem;
1894         struct nvme_id_ns *id_ns;
1895         u8 i;
1896         u8 flbas, nlbaf;
1897         u8 selected_lbaf = 0xFF;
1898         u32 cdw10 = 0;
1899         struct nvme_command c;
1900
1901         /* Loop thru LBAF's in id_ns to match reqd lbaf, put in cdw10 */
1902         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1903                                                         &dma_addr, GFP_KERNEL);
1904         if (mem == NULL) {
1905                 res = -ENOMEM;
1906                 goto out;
1907         }
1908         /* nvme ns identify */
1909         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1910         res = nvme_trans_status_code(hdr, nvme_sc);
1911         if (res)
1912                 goto out_dma;
1913         if (nvme_sc) {
1914                 res = nvme_sc;
1915                 goto out_dma;
1916         }
1917         id_ns = mem;
1918         flbas = (id_ns->flbas) & 0x0F;
1919         nlbaf = id_ns->nlbaf;
1920
1921         for (i = 0; i < nlbaf; i++) {
1922                 if (ns->mode_select_block_len == (1 << (id_ns->lbaf[i].ds))) {
1923                         selected_lbaf = i;
1924                         break;
1925                 }
1926         }
1927         if (selected_lbaf > 0x0F) {
1928                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1929                                 ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
1930                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1931         }
1932         if (ns->mode_select_num_blocks != le64_to_cpu(id_ns->ncap)) {
1933                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1934                                 ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
1935                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1936         }
1937
1938         cdw10 |= prot_info << 5;
1939         cdw10 |= selected_lbaf & 0x0F;
1940         memset(&c, 0, sizeof(c));
1941         c.format.opcode = nvme_admin_format_nvm;
1942         c.format.nsid = cpu_to_le32(ns->ns_id);
1943         c.format.cdw10 = cpu_to_le32(cdw10);
1944
1945         nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
1946         res = nvme_trans_status_code(hdr, nvme_sc);
1947         if (res)
1948                 goto out_dma;
1949         if (nvme_sc)
1950                 res = nvme_sc;
1951
1952  out_dma:
1953         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
1954                           dma_addr);
1955  out:
1956         return res;
1957 }
1958
1959 /* Read/Write Helper Functions */
1960
1961 static inline void nvme_trans_get_io_cdb6(u8 *cmd,
1962                                         struct nvme_trans_io_cdb *cdb_info)
1963 {
1964         cdb_info->fua = 0;
1965         cdb_info->prot_info = 0;
1966         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_6_CDB_LBA_OFFSET) &
1967                                         IO_6_CDB_LBA_MASK;
1968         cdb_info->xfer_len = GET_U8_FROM_CDB(cmd, IO_6_CDB_TX_LEN_OFFSET);
1969
1970         /* sbc3r27 sec 5.32 - TRANSFER LEN of 0 implies a 256 Block transfer */
1971         if (cdb_info->xfer_len == 0)
1972                 cdb_info->xfer_len = IO_6_DEFAULT_TX_LEN;
1973 }
1974
1975 static inline void nvme_trans_get_io_cdb10(u8 *cmd,
1976                                         struct nvme_trans_io_cdb *cdb_info)
1977 {
1978         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_10_CDB_FUA_OFFSET) &
1979                                         IO_CDB_FUA_MASK;
1980         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_10_CDB_WP_OFFSET) &
1981                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
1982         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_10_CDB_LBA_OFFSET);
1983         cdb_info->xfer_len = GET_U16_FROM_CDB(cmd, IO_10_CDB_TX_LEN_OFFSET);
1984 }
1985
1986 static inline void nvme_trans_get_io_cdb12(u8 *cmd,
1987                                         struct nvme_trans_io_cdb *cdb_info)
1988 {
1989         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_12_CDB_FUA_OFFSET) &
1990                                         IO_CDB_FUA_MASK;
1991         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_12_CDB_WP_OFFSET) &
1992                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
1993         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_12_CDB_LBA_OFFSET);
1994         cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_12_CDB_TX_LEN_OFFSET);
1995 }
1996
1997 static inline void nvme_trans_get_io_cdb16(u8 *cmd,
1998                                         struct nvme_trans_io_cdb *cdb_info)
1999 {
2000         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_16_CDB_FUA_OFFSET) &
2001                                         IO_CDB_FUA_MASK;
2002         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_16_CDB_WP_OFFSET) &
2003                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
2004         cdb_info->lba = GET_U64_FROM_CDB(cmd, IO_16_CDB_LBA_OFFSET);
2005         cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_16_CDB_TX_LEN_OFFSET);
2006 }
2007
2008 static inline u32 nvme_trans_io_get_num_cmds(struct sg_io_hdr *hdr,
2009                                         struct nvme_trans_io_cdb *cdb_info,
2010                                         u32 max_blocks)
2011 {
2012         /* If using iovecs, send one nvme command per vector */
2013         if (hdr->iovec_count > 0)
2014                 return hdr->iovec_count;
2015         else if (cdb_info->xfer_len > max_blocks)
2016                 return ((cdb_info->xfer_len - 1) / max_blocks) + 1;
2017         else
2018                 return 1;
2019 }
2020
2021 static u16 nvme_trans_io_get_control(struct nvme_ns *ns,
2022                                         struct nvme_trans_io_cdb *cdb_info)
2023 {
2024         u16 control = 0;
2025
2026         /* When Protection information support is added, implement here */
2027
2028         if (cdb_info->fua > 0)
2029                 control |= NVME_RW_FUA;
2030
2031         return control;
2032 }
2033
2034 static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2035                                 struct nvme_trans_io_cdb *cdb_info, u8 is_write)
2036 {
2037         int res = SNTI_TRANSLATION_SUCCESS;
2038         int nvme_sc;
2039         struct nvme_dev *dev = ns->dev;
2040         struct nvme_queue *nvmeq;
2041         u32 num_cmds;
2042         struct nvme_iod *iod;
2043         u64 unit_len;
2044         u64 unit_num_blocks;    /* Number of blocks to xfer in each nvme cmd */
2045         u32 retcode;
2046         u32 i = 0;
2047         u64 nvme_offset = 0;
2048         void __user *next_mapping_addr;
2049         struct nvme_command c;
2050         u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
2051         u16 control;
2052         u32 max_blocks = nvme_block_nr(ns, dev->max_hw_sectors);
2053
2054         num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);
2055
2056         /*
2057          * This loop handles two cases.
2058          * First, when an SGL is used in the form of an iovec list:
2059          *   - Use iov_base as the next mapping address for the nvme command_id
2060          *   - Use iov_len as the data transfer length for the command.
2061          * Second, when we have a single buffer
2062          *   - If larger than max_blocks, split into chunks, offset
2063          *        each nvme command accordingly.
2064          */
2065         for (i = 0; i < num_cmds; i++) {
2066                 memset(&c, 0, sizeof(c));
2067                 if (hdr->iovec_count > 0) {
2068                         struct sg_iovec sgl;
2069
2070                         retcode = copy_from_user(&sgl, hdr->dxferp +
2071                                         i * sizeof(struct sg_iovec),
2072                                         sizeof(struct sg_iovec));
2073                         if (retcode)
2074                                 return -EFAULT;
2075                         unit_len = sgl.iov_len;
2076                         unit_num_blocks = unit_len >> ns->lba_shift;
2077                         next_mapping_addr = sgl.iov_base;
2078                 } else {
2079                         unit_num_blocks = min((u64)max_blocks,
2080                                         (cdb_info->xfer_len - nvme_offset));
2081                         unit_len = unit_num_blocks << ns->lba_shift;
2082                         next_mapping_addr = hdr->dxferp +
2083                                         ((1 << ns->lba_shift) * nvme_offset);
2084                 }
2085
2086                 c.rw.opcode = opcode;
2087                 c.rw.nsid = cpu_to_le32(ns->ns_id);
2088                 c.rw.slba = cpu_to_le64(cdb_info->lba + nvme_offset);
2089                 c.rw.length = cpu_to_le16(unit_num_blocks - 1);
2090                 control = nvme_trans_io_get_control(ns, cdb_info);
2091                 c.rw.control = cpu_to_le16(control);
2092
2093                 iod = nvme_map_user_pages(dev,
2094                         (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2095                         (unsigned long)next_mapping_addr, unit_len);
2096                 if (IS_ERR(iod)) {
2097                         res = PTR_ERR(iod);
2098                         goto out;
2099                 }
2100                 retcode = nvme_setup_prps(dev, &c.common, iod, unit_len,
2101                                                         GFP_KERNEL);
2102                 if (retcode != unit_len) {
2103                         nvme_unmap_user_pages(dev,
2104                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2105                                 iod);
2106                         nvme_free_iod(dev, iod);
2107                         res = -ENOMEM;
2108                         goto out;
2109                 }
2110
2111                 nvme_offset += unit_num_blocks;
2112
2113                 nvmeq = get_nvmeq(dev);
2114                 /*
2115                  * Since nvme_submit_sync_cmd sleeps, we can't keep
2116                  * preemption disabled.  We may be preempted at any
2117                  * point, and be rescheduled to a different CPU.  That
2118                  * will cause cacheline bouncing, but no additional
2119                  * races since q_lock already protects against other
2120                  * CPUs.
2121                  */
2122                 put_nvmeq(nvmeq);
2123                 nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL,
2124                                                 NVME_IO_TIMEOUT);
2125                 if (nvme_sc != NVME_SC_SUCCESS) {
2126                         nvme_unmap_user_pages(dev,
2127                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2128                                 iod);
2129                         nvme_free_iod(dev, iod);
2130                         res = nvme_trans_status_code(hdr, nvme_sc);
2131                         goto out;
2132                 }
2133                 nvme_unmap_user_pages(dev,
2134                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2135                                 iod);
2136                 nvme_free_iod(dev, iod);
2137         }
2138         res = nvme_trans_status_code(hdr, NVME_SC_SUCCESS);
2139
2140  out:
2141         return res;
2142 }
2143
2144
2145 /* SCSI Command Translation Functions */
2146
2147 static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
2148                                                         u8 *cmd)
2149 {
2150         int res = SNTI_TRANSLATION_SUCCESS;
2151         struct nvme_trans_io_cdb cdb_info;
2152         u8 opcode = cmd[0];
2153         u64 xfer_bytes;
2154         u64 sum_iov_len = 0;
2155         struct sg_iovec sgl;
2156         int i;
2157         size_t not_copied;
2158
2159         /* Extract Fields from CDB */
2160         switch (opcode) {
2161         case WRITE_6:
2162         case READ_6:
2163                 nvme_trans_get_io_cdb6(cmd, &cdb_info);
2164                 break;
2165         case WRITE_10:
2166         case READ_10:
2167                 nvme_trans_get_io_cdb10(cmd, &cdb_info);
2168                 break;
2169         case WRITE_12:
2170         case READ_12:
2171                 nvme_trans_get_io_cdb12(cmd, &cdb_info);
2172                 break;
2173         case WRITE_16:
2174         case READ_16:
2175                 nvme_trans_get_io_cdb16(cmd, &cdb_info);
2176                 break;
2177         default:
2178                 /* Will never really reach here */
2179                 res = SNTI_INTERNAL_ERROR;
2180                 goto out;
2181         }
2182
2183         /* Calculate total length of transfer (in bytes) */
2184         if (hdr->iovec_count > 0) {
2185                 for (i = 0; i < hdr->iovec_count; i++) {
2186                         not_copied = copy_from_user(&sgl, hdr->dxferp +
2187                                                 i * sizeof(struct sg_iovec),
2188                                                 sizeof(struct sg_iovec));
2189                         if (not_copied)
2190                                 return -EFAULT;
2191                         sum_iov_len += sgl.iov_len;
2192                         /* IO vector sizes should be multiples of block size */
2193                         if (sgl.iov_len % (1 << ns->lba_shift) != 0) {
2194                                 res = nvme_trans_completion(hdr,
2195                                                 SAM_STAT_CHECK_CONDITION,
2196                                                 ILLEGAL_REQUEST,
2197                                                 SCSI_ASC_INVALID_PARAMETER,
2198                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2199                                 goto out;
2200                         }
2201                 }
2202         } else {
2203                 sum_iov_len = hdr->dxfer_len;
2204         }
2205
2206         /* As Per sg ioctl howto, if the lengths differ, use the lower one */
2207         xfer_bytes = min(((u64)hdr->dxfer_len), sum_iov_len);
2208
2209         /* If block count and actual data buffer size dont match, error out */
2210         if (xfer_bytes != (cdb_info.xfer_len << ns->lba_shift)) {
2211                 res = -EINVAL;
2212                 goto out;
2213         }
2214
2215         /* Check for 0 length transfer - it is not illegal */
2216         if (cdb_info.xfer_len == 0)
2217                 goto out;
2218
2219         /* Send NVMe IO Command(s) */
2220         res = nvme_trans_do_nvme_io(ns, hdr, &cdb_info, is_write);
2221         if (res != SNTI_TRANSLATION_SUCCESS)
2222                 goto out;
2223
2224  out:
2225         return res;
2226 }
2227
2228 static int nvme_trans_inquiry(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2229                                                         u8 *cmd)
2230 {
2231         int res = SNTI_TRANSLATION_SUCCESS;
2232         u8 evpd;
2233         u8 page_code;
2234         int alloc_len;
2235         u8 *inq_response;
2236
2237         evpd = GET_INQ_EVPD_BIT(cmd);
2238         page_code = GET_INQ_PAGE_CODE(cmd);
2239         alloc_len = GET_INQ_ALLOC_LENGTH(cmd);
2240
2241         inq_response = kmalloc(STANDARD_INQUIRY_LENGTH, GFP_KERNEL);
2242         if (inq_response == NULL) {
2243                 res = -ENOMEM;
2244                 goto out_mem;
2245         }
2246
2247         if (evpd == 0) {
2248                 if (page_code == INQ_STANDARD_INQUIRY_PAGE) {
2249                         res = nvme_trans_standard_inquiry_page(ns, hdr,
2250                                                 inq_response, alloc_len);
2251                 } else {
2252                         res = nvme_trans_completion(hdr,
2253                                                 SAM_STAT_CHECK_CONDITION,
2254                                                 ILLEGAL_REQUEST,
2255                                                 SCSI_ASC_INVALID_CDB,
2256                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2257                 }
2258         } else {
2259                 switch (page_code) {
2260                 case VPD_SUPPORTED_PAGES:
2261                         res = nvme_trans_supported_vpd_pages(ns, hdr,
2262                                                 inq_response, alloc_len);
2263                         break;
2264                 case VPD_SERIAL_NUMBER:
2265                         res = nvme_trans_unit_serial_page(ns, hdr, inq_response,
2266                                                                 alloc_len);
2267                         break;
2268                 case VPD_DEVICE_IDENTIFIERS:
2269                         res = nvme_trans_device_id_page(ns, hdr, inq_response,
2270                                                                 alloc_len);
2271                         break;
2272                 case VPD_EXTENDED_INQUIRY:
2273                         res = nvme_trans_ext_inq_page(ns, hdr, alloc_len);
2274                         break;
2275                 case VPD_BLOCK_DEV_CHARACTERISTICS:
2276                         res = nvme_trans_bdev_char_page(ns, hdr, alloc_len);
2277                         break;
2278                 default:
2279                         res = nvme_trans_completion(hdr,
2280                                                 SAM_STAT_CHECK_CONDITION,
2281                                                 ILLEGAL_REQUEST,
2282                                                 SCSI_ASC_INVALID_CDB,
2283                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2284                         break;
2285                 }
2286         }
2287         kfree(inq_response);
2288  out_mem:
2289         return res;
2290 }
2291
2292 static int nvme_trans_log_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2293                                                         u8 *cmd)
2294 {
2295         int res = SNTI_TRANSLATION_SUCCESS;
2296         u16 alloc_len;
2297         u8 sp;
2298         u8 pc;
2299         u8 page_code;
2300
2301         sp = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_SP_OFFSET);
2302         if (sp != LOG_SENSE_CDB_SP_NOT_ENABLED) {
2303                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2304                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2305                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2306                 goto out;
2307         }
2308         pc = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_PC_OFFSET);
2309         page_code = pc & LOG_SENSE_CDB_PAGE_CODE_MASK;
2310         pc = (pc & LOG_SENSE_CDB_PC_MASK) >> LOG_SENSE_CDB_PC_SHIFT;
2311         if (pc != LOG_SENSE_CDB_PC_CUMULATIVE_VALUES) {
2312                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2313                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2314                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2315                 goto out;
2316         }
2317         alloc_len = GET_U16_FROM_CDB(cmd, LOG_SENSE_CDB_ALLOC_LENGTH_OFFSET);
2318         switch (page_code) {
2319         case LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE:
2320                 res = nvme_trans_log_supp_pages(ns, hdr, alloc_len);
2321                 break;
2322         case LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE:
2323                 res = nvme_trans_log_info_exceptions(ns, hdr, alloc_len);
2324                 break;
2325         case LOG_PAGE_TEMPERATURE_PAGE:
2326                 res = nvme_trans_log_temperature(ns, hdr, alloc_len);
2327                 break;
2328         default:
2329                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2330                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2331                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2332                 break;
2333         }
2334
2335  out:
2336         return res;
2337 }
2338
2339 static int nvme_trans_mode_select(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2340                                                         u8 *cmd)
2341 {
2342         int res = SNTI_TRANSLATION_SUCCESS;
2343         u8 cdb10 = 0;
2344         u16 parm_list_len;
2345         u8 page_format;
2346         u8 save_pages;
2347
2348         page_format = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_PAGE_FORMAT_OFFSET);
2349         page_format &= MODE_SELECT_CDB_PAGE_FORMAT_MASK;
2350
2351         save_pages = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_SAVE_PAGES_OFFSET);
2352         save_pages &= MODE_SELECT_CDB_SAVE_PAGES_MASK;
2353
2354         if (GET_OPCODE(cmd) == MODE_SELECT) {
2355                 parm_list_len = GET_U8_FROM_CDB(cmd,
2356                                 MODE_SELECT_6_CDB_PARAM_LIST_LENGTH_OFFSET);
2357         } else {
2358                 parm_list_len = GET_U16_FROM_CDB(cmd,
2359                                 MODE_SELECT_10_CDB_PARAM_LIST_LENGTH_OFFSET);
2360                 cdb10 = 1;
2361         }
2362
2363         if (parm_list_len != 0) {
2364                 /*
2365                  * According to SPC-4 r24, a paramter list length field of 0
2366                  * shall not be considered an error
2367                  */
2368                 res = nvme_trans_modesel_data(ns, hdr, cmd, parm_list_len,
2369                                                 page_format, save_pages, cdb10);
2370         }
2371
2372         return res;
2373 }
2374
2375 static int nvme_trans_mode_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2376                                                         u8 *cmd)
2377 {
2378         int res = SNTI_TRANSLATION_SUCCESS;
2379         u16 alloc_len;
2380         u8 cdb10 = 0;
2381         u8 page_code;
2382         u8 pc;
2383
2384         if (GET_OPCODE(cmd) == MODE_SENSE) {
2385                 alloc_len = GET_U8_FROM_CDB(cmd, MODE_SENSE6_ALLOC_LEN_OFFSET);
2386         } else {
2387                 alloc_len = GET_U16_FROM_CDB(cmd,
2388                                                 MODE_SENSE10_ALLOC_LEN_OFFSET);
2389                 cdb10 = 1;
2390         }
2391
2392         pc = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CONTROL_OFFSET) &
2393                                                 MODE_SENSE_PAGE_CONTROL_MASK;
2394         if (pc != MODE_SENSE_PC_CURRENT_VALUES) {
2395                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2396                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2397                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2398                 goto out;
2399         }
2400
2401         page_code = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CODE_OFFSET) &
2402                                         MODE_SENSE_PAGE_CODE_MASK;
2403         switch (page_code) {
2404         case MODE_PAGE_CACHING:
2405                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2406                                                 cdb10,
2407                                                 &nvme_trans_fill_caching_page,
2408                                                 MODE_PAGE_CACHING_LEN);
2409                 break;
2410         case MODE_PAGE_CONTROL:
2411                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2412                                                 cdb10,
2413                                                 &nvme_trans_fill_control_page,
2414                                                 MODE_PAGE_CONTROL_LEN);
2415                 break;
2416         case MODE_PAGE_POWER_CONDITION:
2417                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2418                                                 cdb10,
2419                                                 &nvme_trans_fill_pow_cnd_page,
2420                                                 MODE_PAGE_POW_CND_LEN);
2421                 break;
2422         case MODE_PAGE_INFO_EXCEP:
2423                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2424                                                 cdb10,
2425                                                 &nvme_trans_fill_inf_exc_page,
2426                                                 MODE_PAGE_INF_EXC_LEN);
2427                 break;
2428         case MODE_PAGE_RETURN_ALL:
2429                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2430                                                 cdb10,
2431                                                 &nvme_trans_fill_all_pages,
2432                                                 MODE_PAGE_ALL_LEN);
2433                 break;
2434         default:
2435                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2436                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2437                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2438                 break;
2439         }
2440
2441  out:
2442         return res;
2443 }
2444
2445 static int nvme_trans_read_capacity(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2446                                                         u8 *cmd)
2447 {
2448         int res = SNTI_TRANSLATION_SUCCESS;
2449         int nvme_sc;
2450         u32 alloc_len = READ_CAP_10_RESP_SIZE;
2451         u32 resp_size = READ_CAP_10_RESP_SIZE;
2452         u32 xfer_len;
2453         u8 cdb16;
2454         struct nvme_dev *dev = ns->dev;
2455         dma_addr_t dma_addr;
2456         void *mem;
2457         struct nvme_id_ns *id_ns;
2458         u8 *response;
2459
2460         cdb16 = IS_READ_CAP_16(cmd);
2461         if (cdb16) {
2462                 alloc_len = GET_READ_CAP_16_ALLOC_LENGTH(cmd);
2463                 resp_size = READ_CAP_16_RESP_SIZE;
2464         }
2465
2466         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
2467                                                         &dma_addr, GFP_KERNEL);
2468         if (mem == NULL) {
2469                 res = -ENOMEM;
2470                 goto out;
2471         }
2472         /* nvme ns identify */
2473         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
2474         res = nvme_trans_status_code(hdr, nvme_sc);
2475         if (res)
2476                 goto out_dma;
2477         if (nvme_sc) {
2478                 res = nvme_sc;
2479                 goto out_dma;
2480         }
2481         id_ns = mem;
2482
2483         response = kmalloc(resp_size, GFP_KERNEL);
2484         if (response == NULL) {
2485                 res = -ENOMEM;
2486                 goto out_dma;
2487         }
2488         memset(response, 0, resp_size);
2489         nvme_trans_fill_read_cap(response, id_ns, cdb16);
2490
2491         xfer_len = min(alloc_len, resp_size);
2492         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2493
2494         kfree(response);
2495  out_dma:
2496         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
2497                           dma_addr);
2498  out:
2499         return res;
2500 }
2501
2502 static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2503                                                         u8 *cmd)
2504 {
2505         int res = SNTI_TRANSLATION_SUCCESS;
2506         int nvme_sc;
2507         u32 alloc_len, xfer_len, resp_size;
2508         u8 select_report;
2509         u8 *response;
2510         struct nvme_dev *dev = ns->dev;
2511         dma_addr_t dma_addr;
2512         void *mem;
2513         struct nvme_id_ctrl *id_ctrl;
2514         u32 ll_length, lun_id;
2515         u8 lun_id_offset = REPORT_LUNS_FIRST_LUN_OFFSET;
2516         __be32 tmp_len;
2517
2518         alloc_len = GET_REPORT_LUNS_ALLOC_LENGTH(cmd);
2519         select_report = GET_U8_FROM_CDB(cmd, REPORT_LUNS_SR_OFFSET);
2520
2521         if ((select_report != ALL_LUNS_RETURNED) &&
2522             (select_report != ALL_WELL_KNOWN_LUNS_RETURNED) &&
2523             (select_report != RESTRICTED_LUNS_RETURNED)) {
2524                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2525                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2526                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2527                 goto out;
2528         } else {
2529                 /* NVMe Controller Identify */
2530                 mem = dma_alloc_coherent(&dev->pci_dev->dev,
2531                                         sizeof(struct nvme_id_ctrl),
2532                                         &dma_addr, GFP_KERNEL);
2533                 if (mem == NULL) {
2534                         res = -ENOMEM;
2535                         goto out;
2536                 }
2537                 nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
2538                 res = nvme_trans_status_code(hdr, nvme_sc);
2539                 if (res)
2540                         goto out_dma;
2541                 if (nvme_sc) {
2542                         res = nvme_sc;
2543                         goto out_dma;
2544                 }
2545                 id_ctrl = mem;
2546                 ll_length = le32_to_cpu(id_ctrl->nn) * LUN_ENTRY_SIZE;
2547                 resp_size = ll_length + LUN_DATA_HEADER_SIZE;
2548
2549                 if (alloc_len < resp_size) {
2550                         res = nvme_trans_completion(hdr,
2551                                         SAM_STAT_CHECK_CONDITION,
2552                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2553                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2554                         goto out_dma;
2555                 }
2556
2557                 response = kmalloc(resp_size, GFP_KERNEL);
2558                 if (response == NULL) {
2559                         res = -ENOMEM;
2560                         goto out_dma;
2561                 }
2562                 memset(response, 0, resp_size);
2563
2564                 /* The first LUN ID will always be 0 per the SAM spec */
2565                 for (lun_id = 0; lun_id < le32_to_cpu(id_ctrl->nn); lun_id++) {
2566                         /*
2567                          * Set the LUN Id and then increment to the next LUN
2568                          * location in the parameter data.
2569                          */
2570                         __be64 tmp_id = cpu_to_be64(lun_id);
2571                         memcpy(&response[lun_id_offset], &tmp_id, sizeof(u64));
2572                         lun_id_offset += LUN_ENTRY_SIZE;
2573                 }
2574                 tmp_len = cpu_to_be32(ll_length);
2575                 memcpy(response, &tmp_len, sizeof(u32));
2576         }
2577
2578         xfer_len = min(alloc_len, resp_size);
2579         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2580
2581         kfree(response);
2582  out_dma:
2583         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
2584                           dma_addr);
2585  out:
2586         return res;
2587 }
2588
2589 static int nvme_trans_request_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2590                                                         u8 *cmd)
2591 {
2592         int res = SNTI_TRANSLATION_SUCCESS;
2593         u8 alloc_len, xfer_len, resp_size;
2594         u8 desc_format;
2595         u8 *response;
2596
2597         alloc_len = GET_REQUEST_SENSE_ALLOC_LENGTH(cmd);
2598         desc_format = GET_U8_FROM_CDB(cmd, REQUEST_SENSE_DESC_OFFSET);
2599         desc_format &= REQUEST_SENSE_DESC_MASK;
2600
2601         resp_size = ((desc_format) ? (DESC_FMT_SENSE_DATA_SIZE) :
2602                                         (FIXED_FMT_SENSE_DATA_SIZE));
2603         response = kmalloc(resp_size, GFP_KERNEL);
2604         if (response == NULL) {
2605                 res = -ENOMEM;
2606                 goto out;
2607         }
2608         memset(response, 0, resp_size);
2609
2610         if (desc_format == DESCRIPTOR_FORMAT_SENSE_DATA_TYPE) {
2611                 /* Descriptor Format Sense Data */
2612                 response[0] = DESC_FORMAT_SENSE_DATA;
2613                 response[1] = NO_SENSE;
2614                 /* TODO How is LOW POWER CONDITION ON handled? (byte 2) */
2615                 response[2] = SCSI_ASC_NO_SENSE;
2616                 response[3] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
2617                 /* SDAT_OVFL = 0 | Additional Sense Length = 0 */
2618         } else {
2619                 /* Fixed Format Sense Data */
2620                 response[0] = FIXED_SENSE_DATA;
2621                 /* Byte 1 = Obsolete */
2622                 response[2] = NO_SENSE; /* FM, EOM, ILI, SDAT_OVFL = 0 */
2623                 /* Bytes 3-6 - Information - set to zero */
2624                 response[7] = FIXED_SENSE_DATA_ADD_LENGTH;
2625                 /* Bytes 8-11 - Cmd Specific Information - set to zero */
2626                 response[12] = SCSI_ASC_NO_SENSE;
2627                 response[13] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
2628                 /* Byte 14 = Field Replaceable Unit Code = 0 */
2629                 /* Bytes 15-17 - SKSV=0; Sense Key Specific = 0 */
2630         }
2631
2632         xfer_len = min(alloc_len, resp_size);
2633         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2634
2635         kfree(response);
2636  out:
2637         return res;
2638 }
2639
2640 static int nvme_trans_security_protocol(struct nvme_ns *ns,
2641                                         struct sg_io_hdr *hdr,
2642                                         u8 *cmd)
2643 {
2644         return nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2645                                 ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
2646                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2647 }
2648
2649 static int nvme_trans_start_stop(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2650                                                         u8 *cmd)
2651 {
2652         int res = SNTI_TRANSLATION_SUCCESS;
2653         int nvme_sc;
2654         struct nvme_queue *nvmeq;
2655         struct nvme_command c;
2656         u8 immed, pcmod, pc, no_flush, start;
2657
2658         immed = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_IMMED_OFFSET);
2659         pcmod = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_MOD_OFFSET);
2660         pc = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_OFFSET);
2661         no_flush = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_NO_FLUSH_OFFSET);
2662         start = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_START_OFFSET);
2663
2664         immed &= START_STOP_UNIT_CDB_IMMED_MASK;
2665         pcmod &= START_STOP_UNIT_CDB_POWER_COND_MOD_MASK;
2666         pc = (pc & START_STOP_UNIT_CDB_POWER_COND_MASK) >> NIBBLE_SHIFT;
2667         no_flush &= START_STOP_UNIT_CDB_NO_FLUSH_MASK;
2668         start &= START_STOP_UNIT_CDB_START_MASK;
2669
2670         if (immed != 0) {
2671                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2672                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2673                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2674         } else {
2675                 if (no_flush == 0) {
2676                         /* Issue NVME FLUSH command prior to START STOP UNIT */
2677                         memset(&c, 0, sizeof(c));
2678                         c.common.opcode = nvme_cmd_flush;
2679                         c.common.nsid = cpu_to_le32(ns->ns_id);
2680
2681                         nvmeq = get_nvmeq(ns->dev);
2682                         put_nvmeq(nvmeq);
2683                         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2684
2685                         res = nvme_trans_status_code(hdr, nvme_sc);
2686                         if (res)
2687                                 goto out;
2688                         if (nvme_sc) {
2689                                 res = nvme_sc;
2690                                 goto out;
2691                         }
2692                 }
2693                 /* Setup the expected power state transition */
2694                 res = nvme_trans_power_state(ns, hdr, pc, pcmod, start);
2695         }
2696
2697  out:
2698         return res;
2699 }
2700
2701 static int nvme_trans_synchronize_cache(struct nvme_ns *ns,
2702                                         struct sg_io_hdr *hdr, u8 *cmd)
2703 {
2704         int res = SNTI_TRANSLATION_SUCCESS;
2705         int nvme_sc;
2706         struct nvme_command c;
2707         struct nvme_queue *nvmeq;
2708
2709         memset(&c, 0, sizeof(c));
2710         c.common.opcode = nvme_cmd_flush;
2711         c.common.nsid = cpu_to_le32(ns->ns_id);
2712
2713         nvmeq = get_nvmeq(ns->dev);
2714         put_nvmeq(nvmeq);
2715         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2716
2717         res = nvme_trans_status_code(hdr, nvme_sc);
2718         if (res)
2719                 goto out;
2720         if (nvme_sc)
2721                 res = nvme_sc;
2722
2723  out:
2724         return res;
2725 }
2726
2727 static int nvme_trans_format_unit(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2728                                                         u8 *cmd)
2729 {
2730         int res = SNTI_TRANSLATION_SUCCESS;
2731         u8 parm_hdr_len = 0;
2732         u8 nvme_pf_code = 0;
2733         u8 format_prot_info, long_list, format_data;
2734
2735         format_prot_info = GET_U8_FROM_CDB(cmd,
2736                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_OFFSET);
2737         long_list = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_LONG_LIST_OFFSET);
2738         format_data = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_FORMAT_DATA_OFFSET);
2739
2740         format_prot_info = (format_prot_info &
2741                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_MASK) >>
2742                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_SHIFT;
2743         long_list &= FORMAT_UNIT_CDB_LONG_LIST_MASK;
2744         format_data &= FORMAT_UNIT_CDB_FORMAT_DATA_MASK;
2745
2746         if (format_data != 0) {
2747                 if (format_prot_info != 0) {
2748                         if (long_list == 0)
2749                                 parm_hdr_len = FORMAT_UNIT_SHORT_PARM_LIST_LEN;
2750                         else
2751                                 parm_hdr_len = FORMAT_UNIT_LONG_PARM_LIST_LEN;
2752                 }
2753         } else if (format_data == 0 && format_prot_info != 0) {
2754                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2755                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2756                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2757                 goto out;
2758         }
2759
2760         /* Get parm header from data-in/out buffer */
2761         /*
2762          * According to the translation spec, the only fields in the parameter
2763          * list we are concerned with are in the header. So allocate only that.
2764          */
2765         if (parm_hdr_len > 0) {
2766                 res = nvme_trans_fmt_get_parm_header(hdr, parm_hdr_len,
2767                                         format_prot_info, &nvme_pf_code);
2768                 if (res != SNTI_TRANSLATION_SUCCESS)
2769                         goto out;
2770         }
2771
2772         /* Attempt to activate any previously downloaded firmware image */
2773         res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw, 0, 0, 0);
2774
2775         /* Determine Block size and count and send format command */
2776         res = nvme_trans_fmt_set_blk_size_count(ns, hdr);
2777         if (res != SNTI_TRANSLATION_SUCCESS)
2778                 goto out;
2779
2780         res = nvme_trans_fmt_send_cmd(ns, hdr, nvme_pf_code);
2781
2782  out:
2783         return res;
2784 }
2785
2786 static int nvme_trans_test_unit_ready(struct nvme_ns *ns,
2787                                         struct sg_io_hdr *hdr,
2788                                         u8 *cmd)
2789 {
2790         int res = SNTI_TRANSLATION_SUCCESS;
2791         struct nvme_dev *dev = ns->dev;
2792
2793         if (!(readl(&dev->bar->csts) & NVME_CSTS_RDY))
2794                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2795                                             NOT_READY, SCSI_ASC_LUN_NOT_READY,
2796                                             SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2797         else
2798                 res = nvme_trans_completion(hdr, SAM_STAT_GOOD, NO_SENSE, 0, 0);
2799
2800         return res;
2801 }
2802
2803 static int nvme_trans_write_buffer(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2804                                                         u8 *cmd)
2805 {
2806         int res = SNTI_TRANSLATION_SUCCESS;
2807         u32 buffer_offset, parm_list_length;
2808         u8 buffer_id, mode;
2809
2810         parm_list_length =
2811                 GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_PARM_LIST_LENGTH_OFFSET);
2812         if (parm_list_length % BYTES_TO_DWORDS != 0) {
2813                 /* NVMe expects Firmware file to be a whole number of DWORDS */
2814                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2815                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2816                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2817                 goto out;
2818         }
2819         buffer_id = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_ID_OFFSET);
2820         if (buffer_id > NVME_MAX_FIRMWARE_SLOT) {
2821                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2822                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2823                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2824                 goto out;
2825         }
2826         mode = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_MODE_OFFSET) &
2827                                                 WRITE_BUFFER_CDB_MODE_MASK;
2828         buffer_offset =
2829                 GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_OFFSET_OFFSET);
2830
2831         switch (mode) {
2832         case DOWNLOAD_SAVE_ACTIVATE:
2833                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
2834                                                 parm_list_length, buffer_offset,
2835                                                 buffer_id);
2836                 if (res != SNTI_TRANSLATION_SUCCESS)
2837                         goto out;
2838                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
2839                                                 parm_list_length, buffer_offset,
2840                                                 buffer_id);
2841                 break;
2842         case DOWNLOAD_SAVE_DEFER_ACTIVATE:
2843                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
2844                                                 parm_list_length, buffer_offset,
2845                                                 buffer_id);
2846                 break;
2847         case ACTIVATE_DEFERRED_MICROCODE:
2848                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
2849                                                 parm_list_length, buffer_offset,
2850                                                 buffer_id);
2851                 break;
2852         default:
2853                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2854                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2855                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2856                 break;
2857         }
2858
2859  out:
2860         return res;
2861 }
2862
2863 struct scsi_unmap_blk_desc {
2864         __be64  slba;
2865         __be32  nlb;
2866         u32     resv;
2867 };
2868
2869 struct scsi_unmap_parm_list {
2870         __be16  unmap_data_len;
2871         __be16  unmap_blk_desc_data_len;
2872         u32     resv;
2873         struct scsi_unmap_blk_desc desc[0];
2874 };
2875
2876 static int nvme_trans_unmap(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2877                                                         u8 *cmd)
2878 {
2879         struct nvme_dev *dev = ns->dev;
2880         struct scsi_unmap_parm_list *plist;
2881         struct nvme_dsm_range *range;
2882         struct nvme_queue *nvmeq;
2883         struct nvme_command c;
2884         int i, nvme_sc, res = -ENOMEM;
2885         u16 ndesc, list_len;
2886         dma_addr_t dma_addr;
2887
2888         list_len = GET_U16_FROM_CDB(cmd, UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET);
2889         if (!list_len)
2890                 return -EINVAL;
2891
2892         plist = kmalloc(list_len, GFP_KERNEL);
2893         if (!plist)
2894                 return -ENOMEM;
2895
2896         res = nvme_trans_copy_from_user(hdr, plist, list_len);
2897         if (res != SNTI_TRANSLATION_SUCCESS)
2898                 goto out;
2899
2900         ndesc = be16_to_cpu(plist->unmap_blk_desc_data_len) >> 4;
2901         if (!ndesc || ndesc > 256) {
2902                 res = -EINVAL;
2903                 goto out;
2904         }
2905
2906         range = dma_alloc_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
2907                                                         &dma_addr, GFP_KERNEL);
2908         if (!range)
2909                 goto out;
2910
2911         for (i = 0; i < ndesc; i++) {
2912                 range[i].nlb = cpu_to_le32(be32_to_cpu(plist->desc[i].nlb));
2913                 range[i].slba = cpu_to_le64(be64_to_cpu(plist->desc[i].slba));
2914                 range[i].cattr = 0;
2915         }
2916
2917         memset(&c, 0, sizeof(c));
2918         c.dsm.opcode = nvme_cmd_dsm;
2919         c.dsm.nsid = cpu_to_le32(ns->ns_id);
2920         c.dsm.prp1 = cpu_to_le64(dma_addr);
2921         c.dsm.nr = cpu_to_le32(ndesc - 1);
2922         c.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
2923
2924         nvmeq = get_nvmeq(dev);
2925         put_nvmeq(nvmeq);
2926
2927         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2928         res = nvme_trans_status_code(hdr, nvme_sc);
2929
2930         dma_free_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
2931                                                         range, dma_addr);
2932  out:
2933         kfree(plist);
2934         return res;
2935 }
2936
2937 static int nvme_scsi_translate(struct nvme_ns *ns, struct sg_io_hdr *hdr)
2938 {
2939         u8 cmd[BLK_MAX_CDB];
2940         int retcode;
2941         unsigned int opcode;
2942
2943         if (hdr->cmdp == NULL)
2944                 return -EMSGSIZE;
2945         if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
2946                 return -EFAULT;
2947
2948         opcode = cmd[0];
2949
2950         switch (opcode) {
2951         case READ_6:
2952         case READ_10:
2953         case READ_12:
2954         case READ_16:
2955                 retcode = nvme_trans_io(ns, hdr, 0, cmd);
2956                 break;
2957         case WRITE_6:
2958         case WRITE_10:
2959         case WRITE_12:
2960         case WRITE_16:
2961                 retcode = nvme_trans_io(ns, hdr, 1, cmd);
2962                 break;
2963         case INQUIRY:
2964                 retcode = nvme_trans_inquiry(ns, hdr, cmd);
2965                 break;
2966         case LOG_SENSE:
2967                 retcode = nvme_trans_log_sense(ns, hdr, cmd);
2968                 break;
2969         case MODE_SELECT:
2970         case MODE_SELECT_10:
2971                 retcode = nvme_trans_mode_select(ns, hdr, cmd);
2972                 break;
2973         case MODE_SENSE:
2974         case MODE_SENSE_10:
2975                 retcode = nvme_trans_mode_sense(ns, hdr, cmd);
2976                 break;
2977         case READ_CAPACITY:
2978                 retcode = nvme_trans_read_capacity(ns, hdr, cmd);
2979                 break;
2980         case SERVICE_ACTION_IN:
2981                 if (IS_READ_CAP_16(cmd))
2982                         retcode = nvme_trans_read_capacity(ns, hdr, cmd);
2983                 else
2984                         goto out;
2985                 break;
2986         case REPORT_LUNS:
2987                 retcode = nvme_trans_report_luns(ns, hdr, cmd);
2988                 break;
2989         case REQUEST_SENSE:
2990                 retcode = nvme_trans_request_sense(ns, hdr, cmd);
2991                 break;
2992         case SECURITY_PROTOCOL_IN:
2993         case SECURITY_PROTOCOL_OUT:
2994                 retcode = nvme_trans_security_protocol(ns, hdr, cmd);
2995                 break;
2996         case START_STOP:
2997                 retcode = nvme_trans_start_stop(ns, hdr, cmd);
2998                 break;
2999         case SYNCHRONIZE_CACHE:
3000                 retcode = nvme_trans_synchronize_cache(ns, hdr, cmd);
3001                 break;
3002         case FORMAT_UNIT:
3003                 retcode = nvme_trans_format_unit(ns, hdr, cmd);
3004                 break;
3005         case TEST_UNIT_READY:
3006                 retcode = nvme_trans_test_unit_ready(ns, hdr, cmd);
3007                 break;
3008         case WRITE_BUFFER:
3009                 retcode = nvme_trans_write_buffer(ns, hdr, cmd);
3010                 break;
3011         case UNMAP:
3012                 retcode = nvme_trans_unmap(ns, hdr, cmd);
3013                 break;
3014         default:
3015  out:
3016                 retcode = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
3017                                 ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
3018                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
3019                 break;
3020         }
3021         return retcode;
3022 }
3023
3024 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr)
3025 {
3026         struct sg_io_hdr hdr;
3027         int retcode;
3028
3029         if (!capable(CAP_SYS_ADMIN))
3030                 return -EACCES;
3031         if (copy_from_user(&hdr, u_hdr, sizeof(hdr)))
3032                 return -EFAULT;
3033         if (hdr.interface_id != 'S')
3034                 return -EINVAL;
3035         if (hdr.cmd_len > BLK_MAX_CDB)
3036                 return -EINVAL;
3037
3038         retcode = nvme_scsi_translate(ns, &hdr);
3039         if (retcode < 0)
3040                 return retcode;
3041         if (retcode > 0)
3042                 retcode = SNTI_TRANSLATION_SUCCESS;
3043         if (copy_to_user(u_hdr, &hdr, sizeof(sg_io_hdr_t)) > 0)
3044                 return -EFAULT;
3045
3046         return retcode;
3047 }
3048
3049 int nvme_sg_get_version_num(int __user *ip)
3050 {
3051         return put_user(sg_version_num, ip);
3052 }