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 = kzalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
 937         if (inq_response == NULL) {
 938                 res = -ENOMEM;
 939                 goto out_mem;
 940         }
 941
 942         inq_response[1] = INQ_BDEV_CHARACTERISTICS_PAGE;    /* Page Code */
 943         inq_response[2] = 0x00;    /* Page Length MSB */
 944         inq_response[3] = 0x3C;    /* Page Length LSB */
 945         inq_response[4] = 0x00;    /* Medium Rotation Rate MSB */
 946         inq_response[5] = 0x01;    /* Medium Rotation Rate LSB */
 947         inq_response[6] = 0x00;    /* Form Factor */
 948
 949         xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 950         res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
 951
 952         kfree(inq_response);
 953  out_mem:
 954         return res;
 955 }
 956
 957 /* LOG SENSE Helper Functions */
 958
 959 static int nvme_trans_log_supp_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 960                                         int alloc_len)
 961 {
 962         int res = SNTI_TRANSLATION_SUCCESS;
 963         int xfer_len;
 964         u8 *log_response;
 965
 966         log_response = kzalloc(LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH, GFP_KERNEL);
 967         if (log_response == NULL) {
 968                 res = -ENOMEM;
 969                 goto out_mem;
 970         }
 971
 972         log_response[0] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
 973         /* Subpage=0x00, Page Length MSB=0 */
 974         log_response[3] = SUPPORTED_LOG_PAGES_PAGE_LENGTH;
 975         log_response[4] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
 976         log_response[5] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
 977         log_response[6] = LOG_PAGE_TEMPERATURE_PAGE;
 978
 979         xfer_len = min(alloc_len, LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH);
 980         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
 981
 982         kfree(log_response);
 983  out_mem:
 984         return res;
 985 }
 986
 987 static int nvme_trans_log_info_exceptions(struct nvme_ns *ns,
 988                                         struct sg_io_hdr *hdr, int alloc_len)
 989 {
 990         int res = SNTI_TRANSLATION_SUCCESS;
 991         int xfer_len;
 992         u8 *log_response;
 993         struct nvme_command c;
 994         struct nvme_dev *dev = ns->dev;
 995         struct nvme_smart_log *smart_log;
 996         dma_addr_t dma_addr;
 997         void *mem;
 998         u8 temp_c;
 999         u16 temp_k;
1000
1001         log_response = kzalloc(LOG_INFO_EXCP_PAGE_LENGTH, GFP_KERNEL);
1002         if (log_response == NULL) {
1003                 res = -ENOMEM;
1004                 goto out_mem;
1005         }
1006
1007         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1008                                         sizeof(struct nvme_smart_log),
1009                                         &dma_addr, GFP_KERNEL);
1010         if (mem == NULL) {
1011                 res = -ENOMEM;
1012                 goto out_dma;
1013         }
1014
1015         /* Get SMART Log Page */
1016         memset(&c, 0, sizeof(c));
1017         c.common.opcode = nvme_admin_get_log_page;
1018         c.common.nsid = cpu_to_le32(0xFFFFFFFF);
1019         c.common.prp1 = cpu_to_le64(dma_addr);
1020         c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
1021                         BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
1022         res = nvme_submit_admin_cmd(dev, &c, NULL);
1023         if (res != NVME_SC_SUCCESS) {
1024                 temp_c = LOG_TEMP_UNKNOWN;
1025         } else {
1026                 smart_log = mem;
1027                 temp_k = (smart_log->temperature[1] << 8) +
1028                                 (smart_log->temperature[0]);
1029                 temp_c = temp_k - KELVIN_TEMP_FACTOR;
1030         }
1031
1032         log_response[0] = LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE;
1033         /* Subpage=0x00, Page Length MSB=0 */
1034         log_response[3] = REMAINING_INFO_EXCP_PAGE_LENGTH;
1035         /* Informational Exceptions Log Parameter 1 Start */
1036         /* Parameter Code=0x0000 bytes 4,5 */
1037         log_response[6] = 0x23; /* DU=0, TSD=1, ETC=0, TMC=0, FMT_AND_LNK=11b */
1038         log_response[7] = 0x04; /* PARAMETER LENGTH */
1039         /* Add sense Code and qualifier = 0x00 each */
1040         /* Use Temperature from NVMe Get Log Page, convert to C from K */
1041         log_response[10] = temp_c;
1042
1043         xfer_len = min(alloc_len, LOG_INFO_EXCP_PAGE_LENGTH);
1044         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
1045
1046         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
1047                           mem, dma_addr);
1048  out_dma:
1049         kfree(log_response);
1050  out_mem:
1051         return res;
1052 }
1053
1054 static int nvme_trans_log_temperature(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1055                                         int alloc_len)
1056 {
1057         int res = SNTI_TRANSLATION_SUCCESS;
1058         int xfer_len;
1059         u8 *log_response;
1060         struct nvme_command c;
1061         struct nvme_dev *dev = ns->dev;
1062         struct nvme_smart_log *smart_log;
1063         dma_addr_t dma_addr;
1064         void *mem;
1065         u32 feature_resp;
1066         u8 temp_c_cur, temp_c_thresh;
1067         u16 temp_k;
1068
1069         log_response = kzalloc(LOG_TEMP_PAGE_LENGTH, GFP_KERNEL);
1070         if (log_response == NULL) {
1071                 res = -ENOMEM;
1072                 goto out_mem;
1073         }
1074
1075         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1076                                         sizeof(struct nvme_smart_log),
1077                                         &dma_addr, GFP_KERNEL);
1078         if (mem == NULL) {
1079                 res = -ENOMEM;
1080                 goto out_dma;
1081         }
1082
1083         /* Get SMART Log Page */
1084         memset(&c, 0, sizeof(c));
1085         c.common.opcode = nvme_admin_get_log_page;
1086         c.common.nsid = cpu_to_le32(0xFFFFFFFF);
1087         c.common.prp1 = cpu_to_le64(dma_addr);
1088         c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
1089                         BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
1090         res = nvme_submit_admin_cmd(dev, &c, NULL);
1091         if (res != NVME_SC_SUCCESS) {
1092                 temp_c_cur = LOG_TEMP_UNKNOWN;
1093         } else {
1094                 smart_log = mem;
1095                 temp_k = (smart_log->temperature[1] << 8) +
1096                                 (smart_log->temperature[0]);
1097                 temp_c_cur = temp_k - KELVIN_TEMP_FACTOR;
1098         }
1099
1100         /* Get Features for Temp Threshold */
1101         res = nvme_get_features(dev, NVME_FEAT_TEMP_THRESH, 0, 0,
1102                                                                 &feature_resp);
1103         if (res != NVME_SC_SUCCESS)
1104                 temp_c_thresh = LOG_TEMP_UNKNOWN;
1105         else
1106                 temp_c_thresh = (feature_resp & 0xFFFF) - KELVIN_TEMP_FACTOR;
1107
1108         log_response[0] = LOG_PAGE_TEMPERATURE_PAGE;
1109         /* Subpage=0x00, Page Length MSB=0 */
1110         log_response[3] = REMAINING_TEMP_PAGE_LENGTH;
1111         /* Temperature Log Parameter 1 (Temperature) Start */
1112         /* Parameter Code = 0x0000 */
1113         log_response[6] = 0x01;         /* Format and Linking = 01b */
1114         log_response[7] = 0x02;         /* Parameter Length */
1115         /* Use Temperature from NVMe Get Log Page, convert to C from K */
1116         log_response[9] = temp_c_cur;
1117         /* Temperature Log Parameter 2 (Reference Temperature) Start */
1118         log_response[11] = 0x01;        /* Parameter Code = 0x0001 */
1119         log_response[12] = 0x01;        /* Format and Linking = 01b */
1120         log_response[13] = 0x02;        /* Parameter Length */
1121         /* Use Temperature Thresh from NVMe Get Log Page, convert to C from K */
1122         log_response[15] = temp_c_thresh;
1123
1124         xfer_len = min(alloc_len, LOG_TEMP_PAGE_LENGTH);
1125         res = nvme_trans_copy_to_user(hdr, log_response, xfer_len);
1126
1127         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_smart_log),
1128                           mem, dma_addr);
1129  out_dma:
1130         kfree(log_response);
1131  out_mem:
1132         return res;
1133 }
1134
1135 /* MODE SENSE Helper Functions */
1136
1137 static int nvme_trans_fill_mode_parm_hdr(u8 *resp, int len, u8 cdb10, u8 llbaa,
1138                                         u16 mode_data_length, u16 blk_desc_len)
1139 {
1140         /* Quick check to make sure I don't stomp on my own memory... */
1141         if ((cdb10 && len < 8) || (!cdb10 && len < 4))
1142                 return SNTI_INTERNAL_ERROR;
1143
1144         if (cdb10) {
1145                 resp[0] = (mode_data_length & 0xFF00) >> 8;
1146                 resp[1] = (mode_data_length & 0x00FF);
1147                 /* resp[2] and [3] are zero */
1148                 resp[4] = llbaa;
1149                 resp[5] = RESERVED_FIELD;
1150                 resp[6] = (blk_desc_len & 0xFF00) >> 8;
1151                 resp[7] = (blk_desc_len & 0x00FF);
1152         } else {
1153                 resp[0] = (mode_data_length & 0x00FF);
1154                 /* resp[1] and [2] are zero */
1155                 resp[3] = (blk_desc_len & 0x00FF);
1156         }
1157
1158         return SNTI_TRANSLATION_SUCCESS;
1159 }
1160
1161 static int nvme_trans_fill_blk_desc(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1162                                     u8 *resp, int len, u8 llbaa)
1163 {
1164         int res = SNTI_TRANSLATION_SUCCESS;
1165         int nvme_sc;
1166         struct nvme_dev *dev = ns->dev;
1167         dma_addr_t dma_addr;
1168         void *mem;
1169         struct nvme_id_ns *id_ns;
1170         u8 flbas;
1171         u32 lba_length;
1172
1173         if (llbaa == 0 && len < MODE_PAGE_BLK_DES_LEN)
1174                 return SNTI_INTERNAL_ERROR;
1175         else if (llbaa > 0 && len < MODE_PAGE_LLBAA_BLK_DES_LEN)
1176                 return SNTI_INTERNAL_ERROR;
1177
1178         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1179                                                         &dma_addr, GFP_KERNEL);
1180         if (mem == NULL) {
1181                 res = -ENOMEM;
1182                 goto out;
1183         }
1184
1185         /* nvme ns identify */
1186         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1187         res = nvme_trans_status_code(hdr, nvme_sc);
1188         if (res)
1189                 goto out_dma;
1190         if (nvme_sc) {
1191                 res = nvme_sc;
1192                 goto out_dma;
1193         }
1194         id_ns = mem;
1195         flbas = (id_ns->flbas) & 0x0F;
1196         lba_length = (1 << (id_ns->lbaf[flbas].ds));
1197
1198         if (llbaa == 0) {
1199                 __be32 tmp_cap = cpu_to_be32(le64_to_cpu(id_ns->ncap));
1200                 /* Byte 4 is reserved */
1201                 __be32 tmp_len = cpu_to_be32(lba_length & 0x00FFFFFF);
1202
1203                 memcpy(resp, &tmp_cap, sizeof(u32));
1204                 memcpy(&resp[4], &tmp_len, sizeof(u32));
1205         } else {
1206                 __be64 tmp_cap = cpu_to_be64(le64_to_cpu(id_ns->ncap));
1207                 __be32 tmp_len = cpu_to_be32(lba_length);
1208
1209                 memcpy(resp, &tmp_cap, sizeof(u64));
1210                 /* Bytes 8, 9, 10, 11 are reserved */
1211                 memcpy(&resp[12], &tmp_len, sizeof(u32));
1212         }
1213
1214  out_dma:
1215         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
1216                           dma_addr);
1217  out:
1218         return res;
1219 }
1220
1221 static int nvme_trans_fill_control_page(struct nvme_ns *ns,
1222                                         struct sg_io_hdr *hdr, u8 *resp,
1223                                         int len)
1224 {
1225         if (len < MODE_PAGE_CONTROL_LEN)
1226                 return SNTI_INTERNAL_ERROR;
1227
1228         resp[0] = MODE_PAGE_CONTROL;
1229         resp[1] = MODE_PAGE_CONTROL_LEN_FIELD;
1230         resp[2] = 0x0E;         /* TST=000b, TMF_ONLY=0, DPICZ=1,
1231                                  * D_SENSE=1, GLTSD=1, RLEC=0 */
1232         resp[3] = 0x12;         /* Q_ALGO_MODIFIER=1h, NUAR=0, QERR=01b */
1233         /* Byte 4:  VS=0, RAC=0, UA_INT=0, SWP=0 */
1234         resp[5] = 0x40;         /* ATO=0, TAS=1, ATMPE=0, RWWP=0, AUTOLOAD=0 */
1235         /* resp[6] and [7] are obsolete, thus zero */
1236         resp[8] = 0xFF;         /* Busy timeout period = 0xffff */
1237         resp[9] = 0xFF;
1238         /* Bytes 10,11: Extended selftest completion time = 0x0000 */
1239
1240         return SNTI_TRANSLATION_SUCCESS;
1241 }
1242
1243 static int nvme_trans_fill_caching_page(struct nvme_ns *ns,
1244                                         struct sg_io_hdr *hdr,
1245                                         u8 *resp, int len)
1246 {
1247         int res = SNTI_TRANSLATION_SUCCESS;
1248         int nvme_sc;
1249         struct nvme_dev *dev = ns->dev;
1250         u32 feature_resp;
1251         u8 vwc;
1252
1253         if (len < MODE_PAGE_CACHING_LEN)
1254                 return SNTI_INTERNAL_ERROR;
1255
1256         nvme_sc = nvme_get_features(dev, NVME_FEAT_VOLATILE_WC, 0, 0,
1257                                                                 &feature_resp);
1258         res = nvme_trans_status_code(hdr, nvme_sc);
1259         if (res)
1260                 goto out;
1261         if (nvme_sc) {
1262                 res = nvme_sc;
1263                 goto out;
1264         }
1265         vwc = feature_resp & 0x00000001;
1266
1267         resp[0] = MODE_PAGE_CACHING;
1268         resp[1] = MODE_PAGE_CACHING_LEN_FIELD;
1269         resp[2] = vwc << 2;
1270
1271  out:
1272         return res;
1273 }
1274
1275 static int nvme_trans_fill_pow_cnd_page(struct nvme_ns *ns,
1276                                         struct sg_io_hdr *hdr, u8 *resp,
1277                                         int len)
1278 {
1279         int res = SNTI_TRANSLATION_SUCCESS;
1280
1281         if (len < MODE_PAGE_POW_CND_LEN)
1282                 return SNTI_INTERNAL_ERROR;
1283
1284         resp[0] = MODE_PAGE_POWER_CONDITION;
1285         resp[1] = MODE_PAGE_POW_CND_LEN_FIELD;
1286         /* All other bytes are zero */
1287
1288         return res;
1289 }
1290
1291 static int nvme_trans_fill_inf_exc_page(struct nvme_ns *ns,
1292                                         struct sg_io_hdr *hdr, u8 *resp,
1293                                         int len)
1294 {
1295         int res = SNTI_TRANSLATION_SUCCESS;
1296
1297         if (len < MODE_PAGE_INF_EXC_LEN)
1298                 return SNTI_INTERNAL_ERROR;
1299
1300         resp[0] = MODE_PAGE_INFO_EXCEP;
1301         resp[1] = MODE_PAGE_INF_EXC_LEN_FIELD;
1302         resp[2] = 0x88;
1303         /* All other bytes are zero */
1304
1305         return res;
1306 }
1307
1308 static int nvme_trans_fill_all_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1309                                      u8 *resp, int len)
1310 {
1311         int res = SNTI_TRANSLATION_SUCCESS;
1312         u16 mode_pages_offset_1 = 0;
1313         u16 mode_pages_offset_2, mode_pages_offset_3, mode_pages_offset_4;
1314
1315         mode_pages_offset_2 = mode_pages_offset_1 + MODE_PAGE_CACHING_LEN;
1316         mode_pages_offset_3 = mode_pages_offset_2 + MODE_PAGE_CONTROL_LEN;
1317         mode_pages_offset_4 = mode_pages_offset_3 + MODE_PAGE_POW_CND_LEN;
1318
1319         res = nvme_trans_fill_caching_page(ns, hdr, &resp[mode_pages_offset_1],
1320                                         MODE_PAGE_CACHING_LEN);
1321         if (res != SNTI_TRANSLATION_SUCCESS)
1322                 goto out;
1323         res = nvme_trans_fill_control_page(ns, hdr, &resp[mode_pages_offset_2],
1324                                         MODE_PAGE_CONTROL_LEN);
1325         if (res != SNTI_TRANSLATION_SUCCESS)
1326                 goto out;
1327         res = nvme_trans_fill_pow_cnd_page(ns, hdr, &resp[mode_pages_offset_3],
1328                                         MODE_PAGE_POW_CND_LEN);
1329         if (res != SNTI_TRANSLATION_SUCCESS)
1330                 goto out;
1331         res = nvme_trans_fill_inf_exc_page(ns, hdr, &resp[mode_pages_offset_4],
1332                                         MODE_PAGE_INF_EXC_LEN);
1333         if (res != SNTI_TRANSLATION_SUCCESS)
1334                 goto out;
1335
1336  out:
1337         return res;
1338 }
1339
1340 static inline int nvme_trans_get_blk_desc_len(u8 dbd, u8 llbaa)
1341 {
1342         if (dbd == MODE_SENSE_BLK_DESC_ENABLED) {
1343                 /* SPC-4: len = 8 x Num_of_descriptors if llbaa = 0, 16x if 1 */
1344                 return 8 * (llbaa + 1) * MODE_SENSE_BLK_DESC_COUNT;
1345         } else {
1346                 return 0;
1347         }
1348 }
1349
1350 static int nvme_trans_mode_page_create(struct nvme_ns *ns,
1351                                         struct sg_io_hdr *hdr, u8 *cmd,
1352                                         u16 alloc_len, u8 cdb10,
1353                                         int (*mode_page_fill_func)
1354                                         (struct nvme_ns *,
1355                                         struct sg_io_hdr *hdr, u8 *, int),
1356                                         u16 mode_pages_tot_len)
1357 {
1358         int res = SNTI_TRANSLATION_SUCCESS;
1359         int xfer_len;
1360         u8 *response;
1361         u8 dbd, llbaa;
1362         u16 resp_size;
1363         int mph_size;
1364         u16 mode_pages_offset_1;
1365         u16 blk_desc_len, blk_desc_offset, mode_data_length;
1366
1367         dbd = GET_MODE_SENSE_DBD(cmd);
1368         llbaa = GET_MODE_SENSE_LLBAA(cmd);
1369         mph_size = GET_MODE_SENSE_MPH_SIZE(cdb10);
1370         blk_desc_len = nvme_trans_get_blk_desc_len(dbd, llbaa);
1371
1372         resp_size = mph_size + blk_desc_len + mode_pages_tot_len;
1373         /* Refer spc4r34 Table 440 for calculation of Mode data Length field */
1374         mode_data_length = 3 + (3 * cdb10) + blk_desc_len + mode_pages_tot_len;
1375
1376         blk_desc_offset = mph_size;
1377         mode_pages_offset_1 = blk_desc_offset + blk_desc_len;
1378
1379         response = kzalloc(resp_size, GFP_KERNEL);
1380         if (response == NULL) {
1381                 res = -ENOMEM;
1382                 goto out_mem;
1383         }
1384
1385         res = nvme_trans_fill_mode_parm_hdr(&response[0], mph_size, cdb10,
1386                                         llbaa, mode_data_length, blk_desc_len);
1387         if (res != SNTI_TRANSLATION_SUCCESS)
1388                 goto out_free;
1389         if (blk_desc_len > 0) {
1390                 res = nvme_trans_fill_blk_desc(ns, hdr,
1391                                                &response[blk_desc_offset],
1392                                                blk_desc_len, llbaa);
1393                 if (res != SNTI_TRANSLATION_SUCCESS)
1394                         goto out_free;
1395         }
1396         res = mode_page_fill_func(ns, hdr, &response[mode_pages_offset_1],
1397                                         mode_pages_tot_len);
1398         if (res != SNTI_TRANSLATION_SUCCESS)
1399                 goto out_free;
1400
1401         xfer_len = min(alloc_len, resp_size);
1402         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
1403
1404  out_free:
1405         kfree(response);
1406  out_mem:
1407         return res;
1408 }
1409
1410 /* Read Capacity Helper Functions */
1411
1412 static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
1413                                                                 u8 cdb16)
1414 {
1415         u8 flbas;
1416         u32 lba_length;
1417         u64 rlba;
1418         u8 prot_en;
1419         u8 p_type_lut[4] = {0, 0, 1, 2};
1420         __be64 tmp_rlba;
1421         __be32 tmp_rlba_32;
1422         __be32 tmp_len;
1423
1424         flbas = (id_ns->flbas) & 0x0F;
1425         lba_length = (1 << (id_ns->lbaf[flbas].ds));
1426         rlba = le64_to_cpup(&id_ns->nsze) - 1;
1427         (id_ns->dps) ? (prot_en = 0x01) : (prot_en = 0);
1428
1429         if (!cdb16) {
1430                 if (rlba > 0xFFFFFFFF)
1431                         rlba = 0xFFFFFFFF;
1432                 tmp_rlba_32 = cpu_to_be32(rlba);
1433                 tmp_len = cpu_to_be32(lba_length);
1434                 memcpy(response, &tmp_rlba_32, sizeof(u32));
1435                 memcpy(&response[4], &tmp_len, sizeof(u32));
1436         } else {
1437                 tmp_rlba = cpu_to_be64(rlba);
1438                 tmp_len = cpu_to_be32(lba_length);
1439                 memcpy(response, &tmp_rlba, sizeof(u64));
1440                 memcpy(&response[8], &tmp_len, sizeof(u32));
1441                 response[12] = (p_type_lut[id_ns->dps & 0x3] << 1) | prot_en;
1442                 /* P_I_Exponent = 0x0 | LBPPBE = 0x0 */
1443                 /* LBPME = 0 | LBPRZ = 0 | LALBA = 0x00 */
1444                 /* Bytes 16-31 - Reserved */
1445         }
1446 }
1447
1448 /* Start Stop Unit Helper Functions */
1449
1450 static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1451                                                 u8 pc, u8 pcmod, u8 start)
1452 {
1453         int res = SNTI_TRANSLATION_SUCCESS;
1454         int nvme_sc;
1455         struct nvme_dev *dev = ns->dev;
1456         dma_addr_t dma_addr;
1457         void *mem;
1458         struct nvme_id_ctrl *id_ctrl;
1459         int lowest_pow_st;      /* max npss = lowest power consumption */
1460         unsigned ps_desired = 0;
1461
1462         /* NVMe Controller Identify */
1463         mem = dma_alloc_coherent(&dev->pci_dev->dev,
1464                                 sizeof(struct nvme_id_ctrl),
1465                                 &dma_addr, GFP_KERNEL);
1466         if (mem == NULL) {
1467                 res = -ENOMEM;
1468                 goto out;
1469         }
1470         nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
1471         res = nvme_trans_status_code(hdr, nvme_sc);
1472         if (res)
1473                 goto out_dma;
1474         if (nvme_sc) {
1475                 res = nvme_sc;
1476                 goto out_dma;
1477         }
1478         id_ctrl = mem;
1479         lowest_pow_st = id_ctrl->npss - 1;
1480
1481         switch (pc) {
1482         case NVME_POWER_STATE_START_VALID:
1483                 /* Action unspecified if POWER CONDITION MODIFIER != 0 */
1484                 if (pcmod == 0 && start == 0x1)
1485                         ps_desired = POWER_STATE_0;
1486                 if (pcmod == 0 && start == 0x0)
1487                         ps_desired = lowest_pow_st;
1488                 break;
1489         case NVME_POWER_STATE_ACTIVE:
1490                 /* Action unspecified if POWER CONDITION MODIFIER != 0 */
1491                 if (pcmod == 0)
1492                         ps_desired = POWER_STATE_0;
1493                 break;
1494         case NVME_POWER_STATE_IDLE:
1495                 /* Action unspecified if POWER CONDITION MODIFIER != [0,1,2] */
1496                 /* min of desired state and (lps-1) because lps is STOP */
1497                 if (pcmod == 0x0)
1498                         ps_desired = min(POWER_STATE_1, (lowest_pow_st - 1));
1499                 else if (pcmod == 0x1)
1500                         ps_desired = min(POWER_STATE_2, (lowest_pow_st - 1));
1501                 else if (pcmod == 0x2)
1502                         ps_desired = min(POWER_STATE_3, (lowest_pow_st - 1));
1503                 break;
1504         case NVME_POWER_STATE_STANDBY:
1505                 /* Action unspecified if POWER CONDITION MODIFIER != [0,1] */
1506                 if (pcmod == 0x0)
1507                         ps_desired = max(0, (lowest_pow_st - 2));
1508                 else if (pcmod == 0x1)
1509                         ps_desired = max(0, (lowest_pow_st - 1));
1510                 break;
1511         case NVME_POWER_STATE_LU_CONTROL:
1512         default:
1513                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1514                                 ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1515                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1516                 break;
1517         }
1518         nvme_sc = nvme_set_features(dev, NVME_FEAT_POWER_MGMT, ps_desired, 0,
1519                                     NULL);
1520         res = nvme_trans_status_code(hdr, nvme_sc);
1521         if (res)
1522                 goto out_dma;
1523         if (nvme_sc)
1524                 res = nvme_sc;
1525  out_dma:
1526         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
1527                           dma_addr);
1528  out:
1529         return res;
1530 }
1531
1532 /* Write Buffer Helper Functions */
1533 /* Also using this for Format Unit with hdr passed as NULL, and buffer_id, 0 */
1534
1535 static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1536                                         u8 opcode, u32 tot_len, u32 offset,
1537                                         u8 buffer_id)
1538 {
1539         int res = SNTI_TRANSLATION_SUCCESS;
1540         int nvme_sc;
1541         struct nvme_dev *dev = ns->dev;
1542         struct nvme_command c;
1543         struct nvme_iod *iod = NULL;
1544         unsigned length;
1545
1546         memset(&c, 0, sizeof(c));
1547         c.common.opcode = opcode;
1548         if (opcode == nvme_admin_download_fw) {
1549                 if (hdr->iovec_count > 0) {
1550                         /* Assuming SGL is not allowed for this command */
1551                         res = nvme_trans_completion(hdr,
1552                                                 SAM_STAT_CHECK_CONDITION,
1553                                                 ILLEGAL_REQUEST,
1554                                                 SCSI_ASC_INVALID_CDB,
1555                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1556                         goto out;
1557                 }
1558                 iod = nvme_map_user_pages(dev, DMA_TO_DEVICE,
1559                                 (unsigned long)hdr->dxferp, tot_len);
1560                 if (IS_ERR(iod)) {
1561                         res = PTR_ERR(iod);
1562                         goto out;
1563                 }
1564                 length = nvme_setup_prps(dev, &c.common, iod, tot_len,
1565                                                                 GFP_KERNEL);
1566                 if (length != tot_len) {
1567                         res = -ENOMEM;
1568                         goto out_unmap;
1569                 }
1570
1571                 c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
1572                 c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
1573         } else if (opcode == nvme_admin_activate_fw) {
1574                 u32 cdw10 = buffer_id | NVME_FWACT_REPL_ACTV;
1575                 c.common.cdw10[0] = cpu_to_le32(cdw10);
1576         }
1577
1578         nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
1579         res = nvme_trans_status_code(hdr, nvme_sc);
1580         if (res)
1581                 goto out_unmap;
1582         if (nvme_sc)
1583                 res = nvme_sc;
1584
1585  out_unmap:
1586         if (opcode == nvme_admin_download_fw) {
1587                 nvme_unmap_user_pages(dev, DMA_TO_DEVICE, iod);
1588                 nvme_free_iod(dev, iod);
1589         }
1590  out:
1591         return res;
1592 }
1593
1594 /* Mode Select Helper Functions */
1595
1596 static inline void nvme_trans_modesel_get_bd_len(u8 *parm_list, u8 cdb10,
1597                                                 u16 *bd_len, u8 *llbaa)
1598 {
1599         if (cdb10) {
1600                 /* 10 Byte CDB */
1601                 *bd_len = (parm_list[MODE_SELECT_10_BD_OFFSET] << 8) +
1602                         parm_list[MODE_SELECT_10_BD_OFFSET + 1];
1603                 *llbaa = parm_list[MODE_SELECT_10_LLBAA_OFFSET] &&
1604                                 MODE_SELECT_10_LLBAA_MASK;
1605         } else {
1606                 /* 6 Byte CDB */
1607                 *bd_len = parm_list[MODE_SELECT_6_BD_OFFSET];
1608         }
1609 }
1610
1611 static void nvme_trans_modesel_save_bd(struct nvme_ns *ns, u8 *parm_list,
1612                                         u16 idx, u16 bd_len, u8 llbaa)
1613 {
1614         u16 bd_num;
1615
1616         bd_num = bd_len / ((llbaa == 0) ?
1617                         SHORT_DESC_BLOCK : LONG_DESC_BLOCK);
1618         /* Store block descriptor info if a FORMAT UNIT comes later */
1619         /* TODO Saving 1st BD info; what to do if multiple BD received? */
1620         if (llbaa == 0) {
1621                 /* Standard Block Descriptor - spc4r34 7.5.5.1 */
1622                 ns->mode_select_num_blocks =
1623                                 (parm_list[idx + 1] << 16) +
1624                                 (parm_list[idx + 2] << 8) +
1625                                 (parm_list[idx + 3]);
1626
1627                 ns->mode_select_block_len =
1628                                 (parm_list[idx + 5] << 16) +
1629                                 (parm_list[idx + 6] << 8) +
1630                                 (parm_list[idx + 7]);
1631         } else {
1632                 /* Long LBA Block Descriptor - sbc3r27 6.4.2.3 */
1633                 ns->mode_select_num_blocks =
1634                                 (((u64)parm_list[idx + 0]) << 56) +
1635                                 (((u64)parm_list[idx + 1]) << 48) +
1636                                 (((u64)parm_list[idx + 2]) << 40) +
1637                                 (((u64)parm_list[idx + 3]) << 32) +
1638                                 (((u64)parm_list[idx + 4]) << 24) +
1639                                 (((u64)parm_list[idx + 5]) << 16) +
1640                                 (((u64)parm_list[idx + 6]) << 8) +
1641                                 ((u64)parm_list[idx + 7]);
1642
1643                 ns->mode_select_block_len =
1644                                 (parm_list[idx + 12] << 24) +
1645                                 (parm_list[idx + 13] << 16) +
1646                                 (parm_list[idx + 14] << 8) +
1647                                 (parm_list[idx + 15]);
1648         }
1649 }
1650
1651 static int nvme_trans_modesel_get_mp(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1652                                         u8 *mode_page, u8 page_code)
1653 {
1654         int res = SNTI_TRANSLATION_SUCCESS;
1655         int nvme_sc;
1656         struct nvme_dev *dev = ns->dev;
1657         unsigned dword11;
1658
1659         switch (page_code) {
1660         case MODE_PAGE_CACHING:
1661                 dword11 = ((mode_page[2] & CACHING_MODE_PAGE_WCE_MASK) ? 1 : 0);
1662                 nvme_sc = nvme_set_features(dev, NVME_FEAT_VOLATILE_WC, dword11,
1663                                             0, NULL);
1664                 res = nvme_trans_status_code(hdr, nvme_sc);
1665                 if (res)
1666                         break;
1667                 if (nvme_sc) {
1668                         res = nvme_sc;
1669                         break;
1670                 }
1671                 break;
1672         case MODE_PAGE_CONTROL:
1673                 break;
1674         case MODE_PAGE_POWER_CONDITION:
1675                 /* Verify the OS is not trying to set timers */
1676                 if ((mode_page[2] & 0x01) != 0 || (mode_page[3] & 0x0F) != 0) {
1677                         res = nvme_trans_completion(hdr,
1678                                                 SAM_STAT_CHECK_CONDITION,
1679                                                 ILLEGAL_REQUEST,
1680                                                 SCSI_ASC_INVALID_PARAMETER,
1681                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1682                         if (!res)
1683                                 res = SNTI_INTERNAL_ERROR;
1684                         break;
1685                 }
1686                 break;
1687         default:
1688                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1689                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1690                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1691                 if (!res)
1692                         res = SNTI_INTERNAL_ERROR;
1693                 break;
1694         }
1695
1696         return res;
1697 }
1698
1699 static int nvme_trans_modesel_data(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1700                                         u8 *cmd, u16 parm_list_len, u8 pf,
1701                                         u8 sp, u8 cdb10)
1702 {
1703         int res = SNTI_TRANSLATION_SUCCESS;
1704         u8 *parm_list;
1705         u16 bd_len;
1706         u8 llbaa = 0;
1707         u16 index, saved_index;
1708         u8 page_code;
1709         u16 mp_size;
1710
1711         /* Get parm list from data-in/out buffer */
1712         parm_list = kmalloc(parm_list_len, GFP_KERNEL);
1713         if (parm_list == NULL) {
1714                 res = -ENOMEM;
1715                 goto out;
1716         }
1717
1718         res = nvme_trans_copy_from_user(hdr, parm_list, parm_list_len);
1719         if (res != SNTI_TRANSLATION_SUCCESS)
1720                 goto out_mem;
1721
1722         nvme_trans_modesel_get_bd_len(parm_list, cdb10, &bd_len, &llbaa);
1723         index = (cdb10) ? (MODE_SELECT_10_MPH_SIZE) : (MODE_SELECT_6_MPH_SIZE);
1724
1725         if (bd_len != 0) {
1726                 /* Block Descriptors present, parse */
1727                 nvme_trans_modesel_save_bd(ns, parm_list, index, bd_len, llbaa);
1728                 index += bd_len;
1729         }
1730         saved_index = index;
1731
1732         /* Multiple mode pages may be present; iterate through all */
1733         /* In 1st Iteration, don't do NVME Command, only check for CDB errors */
1734         do {
1735                 page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
1736                 mp_size = parm_list[index + 1] + 2;
1737                 if ((page_code != MODE_PAGE_CACHING) &&
1738                     (page_code != MODE_PAGE_CONTROL) &&
1739                     (page_code != MODE_PAGE_POWER_CONDITION)) {
1740                         res = nvme_trans_completion(hdr,
1741                                                 SAM_STAT_CHECK_CONDITION,
1742                                                 ILLEGAL_REQUEST,
1743                                                 SCSI_ASC_INVALID_CDB,
1744                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1745                         goto out_mem;
1746                 }
1747                 index += mp_size;
1748         } while (index < parm_list_len);
1749
1750         /* In 2nd Iteration, do the NVME Commands */
1751         index = saved_index;
1752         do {
1753                 page_code = parm_list[index] & MODE_SELECT_PAGE_CODE_MASK;
1754                 mp_size = parm_list[index + 1] + 2;
1755                 res = nvme_trans_modesel_get_mp(ns, hdr, &parm_list[index],
1756                                                                 page_code);
1757                 if (res != SNTI_TRANSLATION_SUCCESS)
1758                         break;
1759                 index += mp_size;
1760         } while (index < parm_list_len);
1761
1762  out_mem:
1763         kfree(parm_list);
1764  out:
1765         return res;
1766 }
1767
1768 /* Format Unit Helper Functions */
1769
1770 static int nvme_trans_fmt_set_blk_size_count(struct nvme_ns *ns,
1771                                              struct sg_io_hdr *hdr)
1772 {
1773         int res = SNTI_TRANSLATION_SUCCESS;
1774         int nvme_sc;
1775         struct nvme_dev *dev = ns->dev;
1776         dma_addr_t dma_addr;
1777         void *mem;
1778         struct nvme_id_ns *id_ns;
1779         u8 flbas;
1780
1781         /*
1782          * SCSI Expects a MODE SELECT would have been issued prior to
1783          * a FORMAT UNIT, and the block size and number would be used
1784          * from the block descriptor in it. If a MODE SELECT had not
1785          * been issued, FORMAT shall use the current values for both.
1786          */
1787
1788         if (ns->mode_select_num_blocks == 0 || ns->mode_select_block_len == 0) {
1789                 mem = dma_alloc_coherent(&dev->pci_dev->dev,
1790                         sizeof(struct nvme_id_ns), &dma_addr, GFP_KERNEL);
1791                 if (mem == NULL) {
1792                         res = -ENOMEM;
1793                         goto out;
1794                 }
1795                 /* nvme ns identify */
1796                 nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1797                 res = nvme_trans_status_code(hdr, nvme_sc);
1798                 if (res)
1799                         goto out_dma;
1800                 if (nvme_sc) {
1801                         res = nvme_sc;
1802                         goto out_dma;
1803                 }
1804                 id_ns = mem;
1805
1806                 if (ns->mode_select_num_blocks == 0)
1807                         ns->mode_select_num_blocks = le64_to_cpu(id_ns->ncap);
1808                 if (ns->mode_select_block_len == 0) {
1809                         flbas = (id_ns->flbas) & 0x0F;
1810                         ns->mode_select_block_len =
1811                                                 (1 << (id_ns->lbaf[flbas].ds));
1812                 }
1813  out_dma:
1814                 dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1815                                   mem, dma_addr);
1816         }
1817  out:
1818         return res;
1819 }
1820
1821 static int nvme_trans_fmt_get_parm_header(struct sg_io_hdr *hdr, u8 len,
1822                                         u8 format_prot_info, u8 *nvme_pf_code)
1823 {
1824         int res = SNTI_TRANSLATION_SUCCESS;
1825         u8 *parm_list;
1826         u8 pf_usage, pf_code;
1827
1828         parm_list = kmalloc(len, GFP_KERNEL);
1829         if (parm_list == NULL) {
1830                 res = -ENOMEM;
1831                 goto out;
1832         }
1833         res = nvme_trans_copy_from_user(hdr, parm_list, len);
1834         if (res != SNTI_TRANSLATION_SUCCESS)
1835                 goto out_mem;
1836
1837         if ((parm_list[FORMAT_UNIT_IMMED_OFFSET] &
1838                                 FORMAT_UNIT_IMMED_MASK) != 0) {
1839                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1840                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1841                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1842                 goto out_mem;
1843         }
1844
1845         if (len == FORMAT_UNIT_LONG_PARM_LIST_LEN &&
1846             (parm_list[FORMAT_UNIT_PROT_INT_OFFSET] & 0x0F) != 0) {
1847                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1848                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1849                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1850                 goto out_mem;
1851         }
1852         pf_usage = parm_list[FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET] &
1853                         FORMAT_UNIT_PROT_FIELD_USAGE_MASK;
1854         pf_code = (pf_usage << 2) | format_prot_info;
1855         switch (pf_code) {
1856         case 0:
1857                 *nvme_pf_code = 0;
1858                 break;
1859         case 2:
1860                 *nvme_pf_code = 1;
1861                 break;
1862         case 3:
1863                 *nvme_pf_code = 2;
1864                 break;
1865         case 7:
1866                 *nvme_pf_code = 3;
1867                 break;
1868         default:
1869                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1870                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
1871                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1872                 break;
1873         }
1874
1875  out_mem:
1876         kfree(parm_list);
1877  out:
1878         return res;
1879 }
1880
1881 static int nvme_trans_fmt_send_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
1882                                    u8 prot_info)
1883 {
1884         int res = SNTI_TRANSLATION_SUCCESS;
1885         int nvme_sc;
1886         struct nvme_dev *dev = ns->dev;
1887         dma_addr_t dma_addr;
1888         void *mem;
1889         struct nvme_id_ns *id_ns;
1890         u8 i;
1891         u8 flbas, nlbaf;
1892         u8 selected_lbaf = 0xFF;
1893         u32 cdw10 = 0;
1894         struct nvme_command c;
1895
1896         /* Loop thru LBAF's in id_ns to match reqd lbaf, put in cdw10 */
1897         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
1898                                                         &dma_addr, GFP_KERNEL);
1899         if (mem == NULL) {
1900                 res = -ENOMEM;
1901                 goto out;
1902         }
1903         /* nvme ns identify */
1904         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
1905         res = nvme_trans_status_code(hdr, nvme_sc);
1906         if (res)
1907                 goto out_dma;
1908         if (nvme_sc) {
1909                 res = nvme_sc;
1910                 goto out_dma;
1911         }
1912         id_ns = mem;
1913         flbas = (id_ns->flbas) & 0x0F;
1914         nlbaf = id_ns->nlbaf;
1915
1916         for (i = 0; i < nlbaf; i++) {
1917                 if (ns->mode_select_block_len == (1 << (id_ns->lbaf[i].ds))) {
1918                         selected_lbaf = i;
1919                         break;
1920                 }
1921         }
1922         if (selected_lbaf > 0x0F) {
1923                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
1924                                 ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
1925                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
1926         }
1927         if (ns->mode_select_num_blocks != le64_to_cpu(id_ns->ncap)) {
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
1933         cdw10 |= prot_info << 5;
1934         cdw10 |= selected_lbaf & 0x0F;
1935         memset(&c, 0, sizeof(c));
1936         c.format.opcode = nvme_admin_format_nvm;
1937         c.format.nsid = cpu_to_le32(ns->ns_id);
1938         c.format.cdw10 = cpu_to_le32(cdw10);
1939
1940         nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
1941         res = nvme_trans_status_code(hdr, nvme_sc);
1942         if (res)
1943                 goto out_dma;
1944         if (nvme_sc)
1945                 res = nvme_sc;
1946
1947  out_dma:
1948         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
1949                           dma_addr);
1950  out:
1951         return res;
1952 }
1953
1954 /* Read/Write Helper Functions */
1955
1956 static inline void nvme_trans_get_io_cdb6(u8 *cmd,
1957                                         struct nvme_trans_io_cdb *cdb_info)
1958 {
1959         cdb_info->fua = 0;
1960         cdb_info->prot_info = 0;
1961         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_6_CDB_LBA_OFFSET) &
1962                                         IO_6_CDB_LBA_MASK;
1963         cdb_info->xfer_len = GET_U8_FROM_CDB(cmd, IO_6_CDB_TX_LEN_OFFSET);
1964
1965         /* sbc3r27 sec 5.32 - TRANSFER LEN of 0 implies a 256 Block transfer */
1966         if (cdb_info->xfer_len == 0)
1967                 cdb_info->xfer_len = IO_6_DEFAULT_TX_LEN;
1968 }
1969
1970 static inline void nvme_trans_get_io_cdb10(u8 *cmd,
1971                                         struct nvme_trans_io_cdb *cdb_info)
1972 {
1973         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_10_CDB_FUA_OFFSET) &
1974                                         IO_CDB_FUA_MASK;
1975         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_10_CDB_WP_OFFSET) &
1976                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
1977         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_10_CDB_LBA_OFFSET);
1978         cdb_info->xfer_len = GET_U16_FROM_CDB(cmd, IO_10_CDB_TX_LEN_OFFSET);
1979 }
1980
1981 static inline void nvme_trans_get_io_cdb12(u8 *cmd,
1982                                         struct nvme_trans_io_cdb *cdb_info)
1983 {
1984         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_12_CDB_FUA_OFFSET) &
1985                                         IO_CDB_FUA_MASK;
1986         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_12_CDB_WP_OFFSET) &
1987                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
1988         cdb_info->lba = GET_U32_FROM_CDB(cmd, IO_12_CDB_LBA_OFFSET);
1989         cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_12_CDB_TX_LEN_OFFSET);
1990 }
1991
1992 static inline void nvme_trans_get_io_cdb16(u8 *cmd,
1993                                         struct nvme_trans_io_cdb *cdb_info)
1994 {
1995         cdb_info->fua = GET_U8_FROM_CDB(cmd, IO_16_CDB_FUA_OFFSET) &
1996                                         IO_CDB_FUA_MASK;
1997         cdb_info->prot_info = GET_U8_FROM_CDB(cmd, IO_16_CDB_WP_OFFSET) &
1998                                         IO_CDB_WP_MASK >> IO_CDB_WP_SHIFT;
1999         cdb_info->lba = GET_U64_FROM_CDB(cmd, IO_16_CDB_LBA_OFFSET);
2000         cdb_info->xfer_len = GET_U32_FROM_CDB(cmd, IO_16_CDB_TX_LEN_OFFSET);
2001 }
2002
2003 static inline u32 nvme_trans_io_get_num_cmds(struct sg_io_hdr *hdr,
2004                                         struct nvme_trans_io_cdb *cdb_info,
2005                                         u32 max_blocks)
2006 {
2007         /* If using iovecs, send one nvme command per vector */
2008         if (hdr->iovec_count > 0)
2009                 return hdr->iovec_count;
2010         else if (cdb_info->xfer_len > max_blocks)
2011                 return ((cdb_info->xfer_len - 1) / max_blocks) + 1;
2012         else
2013                 return 1;
2014 }
2015
2016 static u16 nvme_trans_io_get_control(struct nvme_ns *ns,
2017                                         struct nvme_trans_io_cdb *cdb_info)
2018 {
2019         u16 control = 0;
2020
2021         /* When Protection information support is added, implement here */
2022
2023         if (cdb_info->fua > 0)
2024                 control |= NVME_RW_FUA;
2025
2026         return control;
2027 }
2028
2029 static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2030                                 struct nvme_trans_io_cdb *cdb_info, u8 is_write)
2031 {
2032         int res = SNTI_TRANSLATION_SUCCESS;
2033         int nvme_sc;
2034         struct nvme_dev *dev = ns->dev;
2035         struct nvme_queue *nvmeq;
2036         u32 num_cmds;
2037         struct nvme_iod *iod;
2038         u64 unit_len;
2039         u64 unit_num_blocks;    /* Number of blocks to xfer in each nvme cmd */
2040         u32 retcode;
2041         u32 i = 0;
2042         u64 nvme_offset = 0;
2043         void __user *next_mapping_addr;
2044         struct nvme_command c;
2045         u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
2046         u16 control;
2047         u32 max_blocks = nvme_block_nr(ns, dev->max_hw_sectors);
2048
2049         num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);
2050
2051         /*
2052          * This loop handles two cases.
2053          * First, when an SGL is used in the form of an iovec list:
2054          *   - Use iov_base as the next mapping address for the nvme command_id
2055          *   - Use iov_len as the data transfer length for the command.
2056          * Second, when we have a single buffer
2057          *   - If larger than max_blocks, split into chunks, offset
2058          *        each nvme command accordingly.
2059          */
2060         for (i = 0; i < num_cmds; i++) {
2061                 memset(&c, 0, sizeof(c));
2062                 if (hdr->iovec_count > 0) {
2063                         struct sg_iovec sgl;
2064
2065                         retcode = copy_from_user(&sgl, hdr->dxferp +
2066                                         i * sizeof(struct sg_iovec),
2067                                         sizeof(struct sg_iovec));
2068                         if (retcode)
2069                                 return -EFAULT;
2070                         unit_len = sgl.iov_len;
2071                         unit_num_blocks = unit_len >> ns->lba_shift;
2072                         next_mapping_addr = sgl.iov_base;
2073                 } else {
2074                         unit_num_blocks = min((u64)max_blocks,
2075                                         (cdb_info->xfer_len - nvme_offset));
2076                         unit_len = unit_num_blocks << ns->lba_shift;
2077                         next_mapping_addr = hdr->dxferp +
2078                                         ((1 << ns->lba_shift) * nvme_offset);
2079                 }
2080
2081                 c.rw.opcode = opcode;
2082                 c.rw.nsid = cpu_to_le32(ns->ns_id);
2083                 c.rw.slba = cpu_to_le64(cdb_info->lba + nvme_offset);
2084                 c.rw.length = cpu_to_le16(unit_num_blocks - 1);
2085                 control = nvme_trans_io_get_control(ns, cdb_info);
2086                 c.rw.control = cpu_to_le16(control);
2087
2088                 iod = nvme_map_user_pages(dev,
2089                         (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2090                         (unsigned long)next_mapping_addr, unit_len);
2091                 if (IS_ERR(iod)) {
2092                         res = PTR_ERR(iod);
2093                         goto out;
2094                 }
2095                 retcode = nvme_setup_prps(dev, &c.common, iod, unit_len,
2096                                                         GFP_KERNEL);
2097                 if (retcode != unit_len) {
2098                         nvme_unmap_user_pages(dev,
2099                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2100                                 iod);
2101                         nvme_free_iod(dev, iod);
2102                         res = -ENOMEM;
2103                         goto out;
2104                 }
2105
2106                 nvme_offset += unit_num_blocks;
2107
2108                 nvmeq = get_nvmeq(dev);
2109                 /*
2110                  * Since nvme_submit_sync_cmd sleeps, we can't keep
2111                  * preemption disabled.  We may be preempted at any
2112                  * point, and be rescheduled to a different CPU.  That
2113                  * will cause cacheline bouncing, but no additional
2114                  * races since q_lock already protects against other
2115                  * CPUs.
2116                  */
2117                 put_nvmeq(nvmeq);
2118                 nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL,
2119                                                 NVME_IO_TIMEOUT);
2120                 if (nvme_sc != NVME_SC_SUCCESS) {
2121                         nvme_unmap_user_pages(dev,
2122                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2123                                 iod);
2124                         nvme_free_iod(dev, iod);
2125                         res = nvme_trans_status_code(hdr, nvme_sc);
2126                         goto out;
2127                 }
2128                 nvme_unmap_user_pages(dev,
2129                                 (is_write) ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
2130                                 iod);
2131                 nvme_free_iod(dev, iod);
2132         }
2133         res = nvme_trans_status_code(hdr, NVME_SC_SUCCESS);
2134
2135  out:
2136         return res;
2137 }
2138
2139
2140 /* SCSI Command Translation Functions */
2141
2142 static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
2143                                                         u8 *cmd)
2144 {
2145         int res = SNTI_TRANSLATION_SUCCESS;
2146         struct nvme_trans_io_cdb cdb_info;
2147         u8 opcode = cmd[0];
2148         u64 xfer_bytes;
2149         u64 sum_iov_len = 0;
2150         struct sg_iovec sgl;
2151         int i;
2152         size_t not_copied;
2153
2154         /* Extract Fields from CDB */
2155         switch (opcode) {
2156         case WRITE_6:
2157         case READ_6:
2158                 nvme_trans_get_io_cdb6(cmd, &cdb_info);
2159                 break;
2160         case WRITE_10:
2161         case READ_10:
2162                 nvme_trans_get_io_cdb10(cmd, &cdb_info);
2163                 break;
2164         case WRITE_12:
2165         case READ_12:
2166                 nvme_trans_get_io_cdb12(cmd, &cdb_info);
2167                 break;
2168         case WRITE_16:
2169         case READ_16:
2170                 nvme_trans_get_io_cdb16(cmd, &cdb_info);
2171                 break;
2172         default:
2173                 /* Will never really reach here */
2174                 res = SNTI_INTERNAL_ERROR;
2175                 goto out;
2176         }
2177
2178         /* Calculate total length of transfer (in bytes) */
2179         if (hdr->iovec_count > 0) {
2180                 for (i = 0; i < hdr->iovec_count; i++) {
2181                         not_copied = copy_from_user(&sgl, hdr->dxferp +
2182                                                 i * sizeof(struct sg_iovec),
2183                                                 sizeof(struct sg_iovec));
2184                         if (not_copied)
2185                                 return -EFAULT;
2186                         sum_iov_len += sgl.iov_len;
2187                         /* IO vector sizes should be multiples of block size */
2188                         if (sgl.iov_len % (1 << ns->lba_shift) != 0) {
2189                                 res = nvme_trans_completion(hdr,
2190                                                 SAM_STAT_CHECK_CONDITION,
2191                                                 ILLEGAL_REQUEST,
2192                                                 SCSI_ASC_INVALID_PARAMETER,
2193                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2194                                 goto out;
2195                         }
2196                 }
2197         } else {
2198                 sum_iov_len = hdr->dxfer_len;
2199         }
2200
2201         /* As Per sg ioctl howto, if the lengths differ, use the lower one */
2202         xfer_bytes = min(((u64)hdr->dxfer_len), sum_iov_len);
2203
2204         /* If block count and actual data buffer size dont match, error out */
2205         if (xfer_bytes != (cdb_info.xfer_len << ns->lba_shift)) {
2206                 res = -EINVAL;
2207                 goto out;
2208         }
2209
2210         /* Check for 0 length transfer - it is not illegal */
2211         if (cdb_info.xfer_len == 0)
2212                 goto out;
2213
2214         /* Send NVMe IO Command(s) */
2215         res = nvme_trans_do_nvme_io(ns, hdr, &cdb_info, is_write);
2216         if (res != SNTI_TRANSLATION_SUCCESS)
2217                 goto out;
2218
2219  out:
2220         return res;
2221 }
2222
2223 static int nvme_trans_inquiry(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2224                                                         u8 *cmd)
2225 {
2226         int res = SNTI_TRANSLATION_SUCCESS;
2227         u8 evpd;
2228         u8 page_code;
2229         int alloc_len;
2230         u8 *inq_response;
2231
2232         evpd = GET_INQ_EVPD_BIT(cmd);
2233         page_code = GET_INQ_PAGE_CODE(cmd);
2234         alloc_len = GET_INQ_ALLOC_LENGTH(cmd);
2235
2236         inq_response = kmalloc(STANDARD_INQUIRY_LENGTH, GFP_KERNEL);
2237         if (inq_response == NULL) {
2238                 res = -ENOMEM;
2239                 goto out_mem;
2240         }
2241
2242         if (evpd == 0) {
2243                 if (page_code == INQ_STANDARD_INQUIRY_PAGE) {
2244                         res = nvme_trans_standard_inquiry_page(ns, hdr,
2245                                                 inq_response, alloc_len);
2246                 } else {
2247                         res = nvme_trans_completion(hdr,
2248                                                 SAM_STAT_CHECK_CONDITION,
2249                                                 ILLEGAL_REQUEST,
2250                                                 SCSI_ASC_INVALID_CDB,
2251                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2252                 }
2253         } else {
2254                 switch (page_code) {
2255                 case VPD_SUPPORTED_PAGES:
2256                         res = nvme_trans_supported_vpd_pages(ns, hdr,
2257                                                 inq_response, alloc_len);
2258                         break;
2259                 case VPD_SERIAL_NUMBER:
2260                         res = nvme_trans_unit_serial_page(ns, hdr, inq_response,
2261                                                                 alloc_len);
2262                         break;
2263                 case VPD_DEVICE_IDENTIFIERS:
2264                         res = nvme_trans_device_id_page(ns, hdr, inq_response,
2265                                                                 alloc_len);
2266                         break;
2267                 case VPD_EXTENDED_INQUIRY:
2268                         res = nvme_trans_ext_inq_page(ns, hdr, alloc_len);
2269                         break;
2270                 case VPD_BLOCK_DEV_CHARACTERISTICS:
2271                         res = nvme_trans_bdev_char_page(ns, hdr, alloc_len);
2272                         break;
2273                 default:
2274                         res = nvme_trans_completion(hdr,
2275                                                 SAM_STAT_CHECK_CONDITION,
2276                                                 ILLEGAL_REQUEST,
2277                                                 SCSI_ASC_INVALID_CDB,
2278                                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2279                         break;
2280                 }
2281         }
2282         kfree(inq_response);
2283  out_mem:
2284         return res;
2285 }
2286
2287 static int nvme_trans_log_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2288                                                         u8 *cmd)
2289 {
2290         int res = SNTI_TRANSLATION_SUCCESS;
2291         u16 alloc_len;
2292         u8 sp;
2293         u8 pc;
2294         u8 page_code;
2295
2296         sp = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_SP_OFFSET);
2297         if (sp != LOG_SENSE_CDB_SP_NOT_ENABLED) {
2298                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2299                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2300                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2301                 goto out;
2302         }
2303         pc = GET_U8_FROM_CDB(cmd, LOG_SENSE_CDB_PC_OFFSET);
2304         page_code = pc & LOG_SENSE_CDB_PAGE_CODE_MASK;
2305         pc = (pc & LOG_SENSE_CDB_PC_MASK) >> LOG_SENSE_CDB_PC_SHIFT;
2306         if (pc != LOG_SENSE_CDB_PC_CUMULATIVE_VALUES) {
2307                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2308                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2309                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2310                 goto out;
2311         }
2312         alloc_len = GET_U16_FROM_CDB(cmd, LOG_SENSE_CDB_ALLOC_LENGTH_OFFSET);
2313         switch (page_code) {
2314         case LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE:
2315                 res = nvme_trans_log_supp_pages(ns, hdr, alloc_len);
2316                 break;
2317         case LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE:
2318                 res = nvme_trans_log_info_exceptions(ns, hdr, alloc_len);
2319                 break;
2320         case LOG_PAGE_TEMPERATURE_PAGE:
2321                 res = nvme_trans_log_temperature(ns, hdr, alloc_len);
2322                 break;
2323         default:
2324                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2325                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2326                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2327                 break;
2328         }
2329
2330  out:
2331         return res;
2332 }
2333
2334 static int nvme_trans_mode_select(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2335                                                         u8 *cmd)
2336 {
2337         int res = SNTI_TRANSLATION_SUCCESS;
2338         u8 cdb10 = 0;
2339         u16 parm_list_len;
2340         u8 page_format;
2341         u8 save_pages;
2342
2343         page_format = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_PAGE_FORMAT_OFFSET);
2344         page_format &= MODE_SELECT_CDB_PAGE_FORMAT_MASK;
2345
2346         save_pages = GET_U8_FROM_CDB(cmd, MODE_SELECT_CDB_SAVE_PAGES_OFFSET);
2347         save_pages &= MODE_SELECT_CDB_SAVE_PAGES_MASK;
2348
2349         if (GET_OPCODE(cmd) == MODE_SELECT) {
2350                 parm_list_len = GET_U8_FROM_CDB(cmd,
2351                                 MODE_SELECT_6_CDB_PARAM_LIST_LENGTH_OFFSET);
2352         } else {
2353                 parm_list_len = GET_U16_FROM_CDB(cmd,
2354                                 MODE_SELECT_10_CDB_PARAM_LIST_LENGTH_OFFSET);
2355                 cdb10 = 1;
2356         }
2357
2358         if (parm_list_len != 0) {
2359                 /*
2360                  * According to SPC-4 r24, a paramter list length field of 0
2361                  * shall not be considered an error
2362                  */
2363                 res = nvme_trans_modesel_data(ns, hdr, cmd, parm_list_len,
2364                                                 page_format, save_pages, cdb10);
2365         }
2366
2367         return res;
2368 }
2369
2370 static int nvme_trans_mode_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2371                                                         u8 *cmd)
2372 {
2373         int res = SNTI_TRANSLATION_SUCCESS;
2374         u16 alloc_len;
2375         u8 cdb10 = 0;
2376         u8 page_code;
2377         u8 pc;
2378
2379         if (GET_OPCODE(cmd) == MODE_SENSE) {
2380                 alloc_len = GET_U8_FROM_CDB(cmd, MODE_SENSE6_ALLOC_LEN_OFFSET);
2381         } else {
2382                 alloc_len = GET_U16_FROM_CDB(cmd,
2383                                                 MODE_SENSE10_ALLOC_LEN_OFFSET);
2384                 cdb10 = 1;
2385         }
2386
2387         pc = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CONTROL_OFFSET) &
2388                                                 MODE_SENSE_PAGE_CONTROL_MASK;
2389         if (pc != MODE_SENSE_PC_CURRENT_VALUES) {
2390                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2391                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2392                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2393                 goto out;
2394         }
2395
2396         page_code = GET_U8_FROM_CDB(cmd, MODE_SENSE_PAGE_CODE_OFFSET) &
2397                                         MODE_SENSE_PAGE_CODE_MASK;
2398         switch (page_code) {
2399         case MODE_PAGE_CACHING:
2400                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2401                                                 cdb10,
2402                                                 &nvme_trans_fill_caching_page,
2403                                                 MODE_PAGE_CACHING_LEN);
2404                 break;
2405         case MODE_PAGE_CONTROL:
2406                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2407                                                 cdb10,
2408                                                 &nvme_trans_fill_control_page,
2409                                                 MODE_PAGE_CONTROL_LEN);
2410                 break;
2411         case MODE_PAGE_POWER_CONDITION:
2412                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2413                                                 cdb10,
2414                                                 &nvme_trans_fill_pow_cnd_page,
2415                                                 MODE_PAGE_POW_CND_LEN);
2416                 break;
2417         case MODE_PAGE_INFO_EXCEP:
2418                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2419                                                 cdb10,
2420                                                 &nvme_trans_fill_inf_exc_page,
2421                                                 MODE_PAGE_INF_EXC_LEN);
2422                 break;
2423         case MODE_PAGE_RETURN_ALL:
2424                 res = nvme_trans_mode_page_create(ns, hdr, cmd, alloc_len,
2425                                                 cdb10,
2426                                                 &nvme_trans_fill_all_pages,
2427                                                 MODE_PAGE_ALL_LEN);
2428                 break;
2429         default:
2430                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2431                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2432                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2433                 break;
2434         }
2435
2436  out:
2437         return res;
2438 }
2439
2440 static int nvme_trans_read_capacity(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2441                                                         u8 *cmd)
2442 {
2443         int res = SNTI_TRANSLATION_SUCCESS;
2444         int nvme_sc;
2445         u32 alloc_len = READ_CAP_10_RESP_SIZE;
2446         u32 resp_size = READ_CAP_10_RESP_SIZE;
2447         u32 xfer_len;
2448         u8 cdb16;
2449         struct nvme_dev *dev = ns->dev;
2450         dma_addr_t dma_addr;
2451         void *mem;
2452         struct nvme_id_ns *id_ns;
2453         u8 *response;
2454
2455         cdb16 = IS_READ_CAP_16(cmd);
2456         if (cdb16) {
2457                 alloc_len = GET_READ_CAP_16_ALLOC_LENGTH(cmd);
2458                 resp_size = READ_CAP_16_RESP_SIZE;
2459         }
2460
2461         mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
2462                                                         &dma_addr, GFP_KERNEL);
2463         if (mem == NULL) {
2464                 res = -ENOMEM;
2465                 goto out;
2466         }
2467         /* nvme ns identify */
2468         nvme_sc = nvme_identify(dev, ns->ns_id, 0, dma_addr);
2469         res = nvme_trans_status_code(hdr, nvme_sc);
2470         if (res)
2471                 goto out_dma;
2472         if (nvme_sc) {
2473                 res = nvme_sc;
2474                 goto out_dma;
2475         }
2476         id_ns = mem;
2477
2478         response = kzalloc(resp_size, GFP_KERNEL);
2479         if (response == NULL) {
2480                 res = -ENOMEM;
2481                 goto out_dma;
2482         }
2483         nvme_trans_fill_read_cap(response, id_ns, cdb16);
2484
2485         xfer_len = min(alloc_len, resp_size);
2486         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2487
2488         kfree(response);
2489  out_dma:
2490         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns), mem,
2491                           dma_addr);
2492  out:
2493         return res;
2494 }
2495
2496 static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2497                                                         u8 *cmd)
2498 {
2499         int res = SNTI_TRANSLATION_SUCCESS;
2500         int nvme_sc;
2501         u32 alloc_len, xfer_len, resp_size;
2502         u8 select_report;
2503         u8 *response;
2504         struct nvme_dev *dev = ns->dev;
2505         dma_addr_t dma_addr;
2506         void *mem;
2507         struct nvme_id_ctrl *id_ctrl;
2508         u32 ll_length, lun_id;
2509         u8 lun_id_offset = REPORT_LUNS_FIRST_LUN_OFFSET;
2510         __be32 tmp_len;
2511
2512         alloc_len = GET_REPORT_LUNS_ALLOC_LENGTH(cmd);
2513         select_report = GET_U8_FROM_CDB(cmd, REPORT_LUNS_SR_OFFSET);
2514
2515         if ((select_report != ALL_LUNS_RETURNED) &&
2516             (select_report != ALL_WELL_KNOWN_LUNS_RETURNED) &&
2517             (select_report != RESTRICTED_LUNS_RETURNED)) {
2518                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2519                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2520                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2521                 goto out;
2522         } else {
2523                 /* NVMe Controller Identify */
2524                 mem = dma_alloc_coherent(&dev->pci_dev->dev,
2525                                         sizeof(struct nvme_id_ctrl),
2526                                         &dma_addr, GFP_KERNEL);
2527                 if (mem == NULL) {
2528                         res = -ENOMEM;
2529                         goto out;
2530                 }
2531                 nvme_sc = nvme_identify(dev, 0, 1, dma_addr);
2532                 res = nvme_trans_status_code(hdr, nvme_sc);
2533                 if (res)
2534                         goto out_dma;
2535                 if (nvme_sc) {
2536                         res = nvme_sc;
2537                         goto out_dma;
2538                 }
2539                 id_ctrl = mem;
2540                 ll_length = le32_to_cpu(id_ctrl->nn) * LUN_ENTRY_SIZE;
2541                 resp_size = ll_length + LUN_DATA_HEADER_SIZE;
2542
2543                 if (alloc_len < resp_size) {
2544                         res = nvme_trans_completion(hdr,
2545                                         SAM_STAT_CHECK_CONDITION,
2546                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2547                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2548                         goto out_dma;
2549                 }
2550
2551                 response = kzalloc(resp_size, GFP_KERNEL);
2552                 if (response == NULL) {
2553                         res = -ENOMEM;
2554                         goto out_dma;
2555                 }
2556
2557                 /* The first LUN ID will always be 0 per the SAM spec */
2558                 for (lun_id = 0; lun_id < le32_to_cpu(id_ctrl->nn); lun_id++) {
2559                         /*
2560                          * Set the LUN Id and then increment to the next LUN
2561                          * location in the parameter data.
2562                          */
2563                         __be64 tmp_id = cpu_to_be64(lun_id);
2564                         memcpy(&response[lun_id_offset], &tmp_id, sizeof(u64));
2565                         lun_id_offset += LUN_ENTRY_SIZE;
2566                 }
2567                 tmp_len = cpu_to_be32(ll_length);
2568                 memcpy(response, &tmp_len, sizeof(u32));
2569         }
2570
2571         xfer_len = min(alloc_len, resp_size);
2572         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2573
2574         kfree(response);
2575  out_dma:
2576         dma_free_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ctrl), mem,
2577                           dma_addr);
2578  out:
2579         return res;
2580 }
2581
2582 static int nvme_trans_request_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2583                                                         u8 *cmd)
2584 {
2585         int res = SNTI_TRANSLATION_SUCCESS;
2586         u8 alloc_len, xfer_len, resp_size;
2587         u8 desc_format;
2588         u8 *response;
2589
2590         alloc_len = GET_REQUEST_SENSE_ALLOC_LENGTH(cmd);
2591         desc_format = GET_U8_FROM_CDB(cmd, REQUEST_SENSE_DESC_OFFSET);
2592         desc_format &= REQUEST_SENSE_DESC_MASK;
2593
2594         resp_size = ((desc_format) ? (DESC_FMT_SENSE_DATA_SIZE) :
2595                                         (FIXED_FMT_SENSE_DATA_SIZE));
2596         response = kzalloc(resp_size, GFP_KERNEL);
2597         if (response == NULL) {
2598                 res = -ENOMEM;
2599                 goto out;
2600         }
2601
2602         if (desc_format == DESCRIPTOR_FORMAT_SENSE_DATA_TYPE) {
2603                 /* Descriptor Format Sense Data */
2604                 response[0] = DESC_FORMAT_SENSE_DATA;
2605                 response[1] = NO_SENSE;
2606                 /* TODO How is LOW POWER CONDITION ON handled? (byte 2) */
2607                 response[2] = SCSI_ASC_NO_SENSE;
2608                 response[3] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
2609                 /* SDAT_OVFL = 0 | Additional Sense Length = 0 */
2610         } else {
2611                 /* Fixed Format Sense Data */
2612                 response[0] = FIXED_SENSE_DATA;
2613                 /* Byte 1 = Obsolete */
2614                 response[2] = NO_SENSE; /* FM, EOM, ILI, SDAT_OVFL = 0 */
2615                 /* Bytes 3-6 - Information - set to zero */
2616                 response[7] = FIXED_SENSE_DATA_ADD_LENGTH;
2617                 /* Bytes 8-11 - Cmd Specific Information - set to zero */
2618                 response[12] = SCSI_ASC_NO_SENSE;
2619                 response[13] = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
2620                 /* Byte 14 = Field Replaceable Unit Code = 0 */
2621                 /* Bytes 15-17 - SKSV=0; Sense Key Specific = 0 */
2622         }
2623
2624         xfer_len = min(alloc_len, resp_size);
2625         res = nvme_trans_copy_to_user(hdr, response, xfer_len);
2626
2627         kfree(response);
2628  out:
2629         return res;
2630 }
2631
2632 static int nvme_trans_security_protocol(struct nvme_ns *ns,
2633                                         struct sg_io_hdr *hdr,
2634                                         u8 *cmd)
2635 {
2636         return nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2637                                 ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
2638                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2639 }
2640
2641 static int nvme_trans_start_stop(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2642                                                         u8 *cmd)
2643 {
2644         int res = SNTI_TRANSLATION_SUCCESS;
2645         int nvme_sc;
2646         struct nvme_queue *nvmeq;
2647         struct nvme_command c;
2648         u8 immed, pcmod, pc, no_flush, start;
2649
2650         immed = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_IMMED_OFFSET);
2651         pcmod = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_MOD_OFFSET);
2652         pc = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_POWER_COND_OFFSET);
2653         no_flush = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_NO_FLUSH_OFFSET);
2654         start = GET_U8_FROM_CDB(cmd, START_STOP_UNIT_CDB_START_OFFSET);
2655
2656         immed &= START_STOP_UNIT_CDB_IMMED_MASK;
2657         pcmod &= START_STOP_UNIT_CDB_POWER_COND_MOD_MASK;
2658         pc = (pc & START_STOP_UNIT_CDB_POWER_COND_MASK) >> NIBBLE_SHIFT;
2659         no_flush &= START_STOP_UNIT_CDB_NO_FLUSH_MASK;
2660         start &= START_STOP_UNIT_CDB_START_MASK;
2661
2662         if (immed != 0) {
2663                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2664                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2665                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2666         } else {
2667                 if (no_flush == 0) {
2668                         /* Issue NVME FLUSH command prior to START STOP UNIT */
2669                         memset(&c, 0, sizeof(c));
2670                         c.common.opcode = nvme_cmd_flush;
2671                         c.common.nsid = cpu_to_le32(ns->ns_id);
2672
2673                         nvmeq = get_nvmeq(ns->dev);
2674                         put_nvmeq(nvmeq);
2675                         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2676
2677                         res = nvme_trans_status_code(hdr, nvme_sc);
2678                         if (res)
2679                                 goto out;
2680                         if (nvme_sc) {
2681                                 res = nvme_sc;
2682                                 goto out;
2683                         }
2684                 }
2685                 /* Setup the expected power state transition */
2686                 res = nvme_trans_power_state(ns, hdr, pc, pcmod, start);
2687         }
2688
2689  out:
2690         return res;
2691 }
2692
2693 static int nvme_trans_synchronize_cache(struct nvme_ns *ns,
2694                                         struct sg_io_hdr *hdr, u8 *cmd)
2695 {
2696         int res = SNTI_TRANSLATION_SUCCESS;
2697         int nvme_sc;
2698         struct nvme_command c;
2699         struct nvme_queue *nvmeq;
2700
2701         memset(&c, 0, sizeof(c));
2702         c.common.opcode = nvme_cmd_flush;
2703         c.common.nsid = cpu_to_le32(ns->ns_id);
2704
2705         nvmeq = get_nvmeq(ns->dev);
2706         put_nvmeq(nvmeq);
2707         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2708
2709         res = nvme_trans_status_code(hdr, nvme_sc);
2710         if (res)
2711                 goto out;
2712         if (nvme_sc)
2713                 res = nvme_sc;
2714
2715  out:
2716         return res;
2717 }
2718
2719 static int nvme_trans_format_unit(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2720                                                         u8 *cmd)
2721 {
2722         int res = SNTI_TRANSLATION_SUCCESS;
2723         u8 parm_hdr_len = 0;
2724         u8 nvme_pf_code = 0;
2725         u8 format_prot_info, long_list, format_data;
2726
2727         format_prot_info = GET_U8_FROM_CDB(cmd,
2728                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_OFFSET);
2729         long_list = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_LONG_LIST_OFFSET);
2730         format_data = GET_U8_FROM_CDB(cmd, FORMAT_UNIT_CDB_FORMAT_DATA_OFFSET);
2731
2732         format_prot_info = (format_prot_info &
2733                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_MASK) >>
2734                                 FORMAT_UNIT_CDB_FORMAT_PROT_INFO_SHIFT;
2735         long_list &= FORMAT_UNIT_CDB_LONG_LIST_MASK;
2736         format_data &= FORMAT_UNIT_CDB_FORMAT_DATA_MASK;
2737
2738         if (format_data != 0) {
2739                 if (format_prot_info != 0) {
2740                         if (long_list == 0)
2741                                 parm_hdr_len = FORMAT_UNIT_SHORT_PARM_LIST_LEN;
2742                         else
2743                                 parm_hdr_len = FORMAT_UNIT_LONG_PARM_LIST_LEN;
2744                 }
2745         } else if (format_data == 0 && format_prot_info != 0) {
2746                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2747                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2748                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2749                 goto out;
2750         }
2751
2752         /* Get parm header from data-in/out buffer */
2753         /*
2754          * According to the translation spec, the only fields in the parameter
2755          * list we are concerned with are in the header. So allocate only that.
2756          */
2757         if (parm_hdr_len > 0) {
2758                 res = nvme_trans_fmt_get_parm_header(hdr, parm_hdr_len,
2759                                         format_prot_info, &nvme_pf_code);
2760                 if (res != SNTI_TRANSLATION_SUCCESS)
2761                         goto out;
2762         }
2763
2764         /* Attempt to activate any previously downloaded firmware image */
2765         res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw, 0, 0, 0);
2766
2767         /* Determine Block size and count and send format command */
2768         res = nvme_trans_fmt_set_blk_size_count(ns, hdr);
2769         if (res != SNTI_TRANSLATION_SUCCESS)
2770                 goto out;
2771
2772         res = nvme_trans_fmt_send_cmd(ns, hdr, nvme_pf_code);
2773
2774  out:
2775         return res;
2776 }
2777
2778 static int nvme_trans_test_unit_ready(struct nvme_ns *ns,
2779                                         struct sg_io_hdr *hdr,
2780                                         u8 *cmd)
2781 {
2782         int res = SNTI_TRANSLATION_SUCCESS;
2783         struct nvme_dev *dev = ns->dev;
2784
2785         if (!(readl(&dev->bar->csts) & NVME_CSTS_RDY))
2786                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2787                                             NOT_READY, SCSI_ASC_LUN_NOT_READY,
2788                                             SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2789         else
2790                 res = nvme_trans_completion(hdr, SAM_STAT_GOOD, NO_SENSE, 0, 0);
2791
2792         return res;
2793 }
2794
2795 static int nvme_trans_write_buffer(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2796                                                         u8 *cmd)
2797 {
2798         int res = SNTI_TRANSLATION_SUCCESS;
2799         u32 buffer_offset, parm_list_length;
2800         u8 buffer_id, mode;
2801
2802         parm_list_length =
2803                 GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_PARM_LIST_LENGTH_OFFSET);
2804         if (parm_list_length % BYTES_TO_DWORDS != 0) {
2805                 /* NVMe expects Firmware file to be a whole number of DWORDS */
2806                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2807                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2808                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2809                 goto out;
2810         }
2811         buffer_id = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_ID_OFFSET);
2812         if (buffer_id > NVME_MAX_FIRMWARE_SLOT) {
2813                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2814                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2815                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2816                 goto out;
2817         }
2818         mode = GET_U8_FROM_CDB(cmd, WRITE_BUFFER_CDB_MODE_OFFSET) &
2819                                                 WRITE_BUFFER_CDB_MODE_MASK;
2820         buffer_offset =
2821                 GET_U24_FROM_CDB(cmd, WRITE_BUFFER_CDB_BUFFER_OFFSET_OFFSET);
2822
2823         switch (mode) {
2824         case DOWNLOAD_SAVE_ACTIVATE:
2825                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
2826                                                 parm_list_length, buffer_offset,
2827                                                 buffer_id);
2828                 if (res != SNTI_TRANSLATION_SUCCESS)
2829                         goto out;
2830                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
2831                                                 parm_list_length, buffer_offset,
2832                                                 buffer_id);
2833                 break;
2834         case DOWNLOAD_SAVE_DEFER_ACTIVATE:
2835                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_download_fw,
2836                                                 parm_list_length, buffer_offset,
2837                                                 buffer_id);
2838                 break;
2839         case ACTIVATE_DEFERRED_MICROCODE:
2840                 res = nvme_trans_send_fw_cmd(ns, hdr, nvme_admin_activate_fw,
2841                                                 parm_list_length, buffer_offset,
2842                                                 buffer_id);
2843                 break;
2844         default:
2845                 res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
2846                                         ILLEGAL_REQUEST, SCSI_ASC_INVALID_CDB,
2847                                         SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
2848                 break;
2849         }
2850
2851  out:
2852         return res;
2853 }
2854
2855 struct scsi_unmap_blk_desc {
2856         __be64  slba;
2857         __be32  nlb;
2858         u32     resv;
2859 };
2860
2861 struct scsi_unmap_parm_list {
2862         __be16  unmap_data_len;
2863         __be16  unmap_blk_desc_data_len;
2864         u32     resv;
2865         struct scsi_unmap_blk_desc desc[0];
2866 };
2867
2868 static int nvme_trans_unmap(struct nvme_ns *ns, struct sg_io_hdr *hdr,
2869                                                         u8 *cmd)
2870 {
2871         struct nvme_dev *dev = ns->dev;
2872         struct scsi_unmap_parm_list *plist;
2873         struct nvme_dsm_range *range;
2874         struct nvme_queue *nvmeq;
2875         struct nvme_command c;
2876         int i, nvme_sc, res = -ENOMEM;
2877         u16 ndesc, list_len;
2878         dma_addr_t dma_addr;
2879
2880         list_len = GET_U16_FROM_CDB(cmd, UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET);
2881         if (!list_len)
2882                 return -EINVAL;
2883
2884         plist = kmalloc(list_len, GFP_KERNEL);
2885         if (!plist)
2886                 return -ENOMEM;
2887
2888         res = nvme_trans_copy_from_user(hdr, plist, list_len);
2889         if (res != SNTI_TRANSLATION_SUCCESS)
2890                 goto out;
2891
2892         ndesc = be16_to_cpu(plist->unmap_blk_desc_data_len) >> 4;
2893         if (!ndesc || ndesc > 256) {
2894                 res = -EINVAL;
2895                 goto out;
2896         }
2897
2898         range = dma_alloc_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
2899                                                         &dma_addr, GFP_KERNEL);
2900         if (!range)
2901                 goto out;
2902
2903         for (i = 0; i < ndesc; i++) {
2904                 range[i].nlb = cpu_to_le32(be32_to_cpu(plist->desc[i].nlb));
2905                 range[i].slba = cpu_to_le64(be64_to_cpu(plist->desc[i].slba));
2906                 range[i].cattr = 0;
2907         }
2908
2909         memset(&c, 0, sizeof(c));
2910         c.dsm.opcode = nvme_cmd_dsm;
2911         c.dsm.nsid = cpu_to_le32(ns->ns_id);
2912         c.dsm.prp1 = cpu_to_le64(dma_addr);
2913         c.dsm.nr = cpu_to_le32(ndesc - 1);
2914         c.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
2915
2916         nvmeq = get_nvmeq(dev);
2917         put_nvmeq(nvmeq);
2918
2919         nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
2920         res = nvme_trans_status_code(hdr, nvme_sc);
2921
2922         dma_free_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range),
2923                                                         range, dma_addr);
2924  out:
2925         kfree(plist);
2926         return res;
2927 }
2928
2929 static int nvme_scsi_translate(struct nvme_ns *ns, struct sg_io_hdr *hdr)
2930 {
2931         u8 cmd[BLK_MAX_CDB];
2932         int retcode;
2933         unsigned int opcode;
2934
2935         if (hdr->cmdp == NULL)
2936                 return -EMSGSIZE;
2937         if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
2938                 return -EFAULT;
2939
2940         opcode = cmd[0];
2941
2942         switch (opcode) {
2943         case READ_6:
2944         case READ_10:
2945         case READ_12:
2946         case READ_16:
2947                 retcode = nvme_trans_io(ns, hdr, 0, cmd);
2948                 break;
2949         case WRITE_6:
2950         case WRITE_10:
2951         case WRITE_12:
2952         case WRITE_16:
2953                 retcode = nvme_trans_io(ns, hdr, 1, cmd);
2954                 break;
2955         case INQUIRY:
2956                 retcode = nvme_trans_inquiry(ns, hdr, cmd);
2957                 break;
2958         case LOG_SENSE:
2959                 retcode = nvme_trans_log_sense(ns, hdr, cmd);
2960                 break;
2961         case MODE_SELECT:
2962         case MODE_SELECT_10:
2963                 retcode = nvme_trans_mode_select(ns, hdr, cmd);
2964                 break;
2965         case MODE_SENSE:
2966         case MODE_SENSE_10:
2967                 retcode = nvme_trans_mode_sense(ns, hdr, cmd);
2968                 break;
2969         case READ_CAPACITY:
2970                 retcode = nvme_trans_read_capacity(ns, hdr, cmd);
2971                 break;
2972         case SERVICE_ACTION_IN:
2973                 if (IS_READ_CAP_16(cmd))
2974                         retcode = nvme_trans_read_capacity(ns, hdr, cmd);
2975                 else
2976                         goto out;
2977                 break;
2978         case REPORT_LUNS:
2979                 retcode = nvme_trans_report_luns(ns, hdr, cmd);
2980                 break;
2981         case REQUEST_SENSE:
2982                 retcode = nvme_trans_request_sense(ns, hdr, cmd);
2983                 break;
2984         case SECURITY_PROTOCOL_IN:
2985         case SECURITY_PROTOCOL_OUT:
2986                 retcode = nvme_trans_security_protocol(ns, hdr, cmd);
2987                 break;
2988         case START_STOP:
2989                 retcode = nvme_trans_start_stop(ns, hdr, cmd);
2990                 break;
2991         case SYNCHRONIZE_CACHE:
2992                 retcode = nvme_trans_synchronize_cache(ns, hdr, cmd);
2993                 break;
2994         case FORMAT_UNIT:
2995                 retcode = nvme_trans_format_unit(ns, hdr, cmd);
2996                 break;
2997         case TEST_UNIT_READY:
2998                 retcode = nvme_trans_test_unit_ready(ns, hdr, cmd);
2999                 break;
3000         case WRITE_BUFFER:
3001                 retcode = nvme_trans_write_buffer(ns, hdr, cmd);
3002                 break;
3003         case UNMAP:
3004                 retcode = nvme_trans_unmap(ns, hdr, cmd);
3005                 break;
3006         default:
3007  out:
3008                 retcode = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
3009                                 ILLEGAL_REQUEST, SCSI_ASC_ILLEGAL_COMMAND,
3010                                 SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
3011                 break;
3012         }
3013         return retcode;
3014 }
3015
3016 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr)
3017 {
3018         struct sg_io_hdr hdr;
3019         int retcode;
3020
3021         if (!capable(CAP_SYS_ADMIN))
3022                 return -EACCES;
3023         if (copy_from_user(&hdr, u_hdr, sizeof(hdr)))
3024                 return -EFAULT;
3025         if (hdr.interface_id != 'S')
3026                 return -EINVAL;
3027         if (hdr.cmd_len > BLK_MAX_CDB)
3028                 return -EINVAL;
3029
3030         retcode = nvme_scsi_translate(ns, &hdr);
3031         if (retcode < 0)
3032                 return retcode;
3033         if (retcode > 0)
3034                 retcode = SNTI_TRANSLATION_SUCCESS;
3035         if (copy_to_user(u_hdr, &hdr, sizeof(sg_io_hdr_t)) > 0)
3036                 return -EFAULT;
3037
3038         return retcode;
3039 }
3040
3041 int nvme_sg_get_version_num(int __user *ip)
3042 {
3043         return put_user(sg_version_num, ip);
3044 }