drivers/scsi/scsi_debug.c

   1 /*
   2  * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
   3  *  Copyright (C) 1992  Eric Youngdale
   4  *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
   5  *  to make sure that we are not getting blocks mixed up, and PANIC if
   6  *  anything out of the ordinary is seen.
   7  * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   8  *
   9  *  This version is more generic, simulating a variable number of disk
  10  *  (or disk like devices) sharing a common amount of RAM. To be more
  11  *  realistic, the simulated devices have the transport attributes of
  12  *  SAS disks.
  13  *
  14  *
  15  *  For documentation see http://sg.danny.cz/sg/sdebug26.html
  16  *
  17  *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
  18  *   dpg: work for devfs large number of disks [20010809]
  19  *        forked for lk 2.5 series [20011216, 20020101]
  20  *        use vmalloc() more inquiry+mode_sense [20020302]
  21  *        add timers for delayed responses [20020721]
  22  *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
  23  *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
  24  *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
  25  *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
  26  */
  27
  28 #include <linux/module.h>
  29
  30 #include <linux/kernel.h>
  31 #include <linux/errno.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/genhd.h>
  37 #include <linux/fs.h>
  38 #include <linux/init.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/scatterlist.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/crc-t10dif.h>
  45
  46 #include <net/checksum.h>
  47
  48 #include <asm/unaligned.h>
  49
  50 #include <scsi/scsi.h>
  51 #include <scsi/scsi_cmnd.h>
  52 #include <scsi/scsi_device.h>
  53 #include <scsi/scsi_host.h>
  54 #include <scsi/scsicam.h>
  55 #include <scsi/scsi_eh.h>
  56 #include <scsi/scsi_dbg.h>
  57
  58 #include "sd.h"
  59 #include "scsi_logging.h"
  60
  61 #define SCSI_DEBUG_VERSION "1.82"
  62 static const char * scsi_debug_version_date = "20100324";
  63
  64 /* Additional Sense Code (ASC) */
  65 #define NO_ADDITIONAL_SENSE 0x0
  66 #define LOGICAL_UNIT_NOT_READY 0x4
  67 #define UNRECOVERED_READ_ERR 0x11
  68 #define PARAMETER_LIST_LENGTH_ERR 0x1a
  69 #define INVALID_OPCODE 0x20
  70 #define ADDR_OUT_OF_RANGE 0x21
  71 #define INVALID_COMMAND_OPCODE 0x20
  72 #define INVALID_FIELD_IN_CDB 0x24
  73 #define INVALID_FIELD_IN_PARAM_LIST 0x26
  74 #define POWERON_RESET 0x29
  75 #define SAVING_PARAMS_UNSUP 0x39
  76 #define TRANSPORT_PROBLEM 0x4b
  77 #define THRESHOLD_EXCEEDED 0x5d
  78 #define LOW_POWER_COND_ON 0x5e
  79
  80 /* Additional Sense Code Qualifier (ASCQ) */
  81 #define ACK_NAK_TO 0x3
  82
  83 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
  84
  85 /* Default values for driver parameters */
  86 #define DEF_NUM_HOST   1
  87 #define DEF_NUM_TGTS   1
  88 #define DEF_MAX_LUNS   1
  89 /* With these defaults, this driver will make 1 host with 1 target
  90  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  91  */
  92 #define DEF_ATO 1
  93 #define DEF_DELAY   1
  94 #define DEF_DEV_SIZE_MB   8
  95 #define DEF_DIF 0
  96 #define DEF_DIX 0
  97 #define DEF_D_SENSE   0
  98 #define DEF_EVERY_NTH   0
  99 #define DEF_FAKE_RW     0
 100 #define DEF_GUARD 0
 101 #define DEF_LBPU 0
 102 #define DEF_LBPWS 0
 103 #define DEF_LBPWS10 0
 104 #define DEF_LBPRZ 1
 105 #define DEF_LOWEST_ALIGNED 0
 106 #define DEF_NO_LUN_0   0
 107 #define DEF_NUM_PARTS   0
 108 #define DEF_OPTS   0
 109 #define DEF_OPT_BLKS 64
 110 #define DEF_PHYSBLK_EXP 0
 111 #define DEF_PTYPE   0
 112 #define DEF_REMOVABLE false
 113 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
 114 #define DEF_SECTOR_SIZE 512
 115 #define DEF_UNMAP_ALIGNMENT 0
 116 #define DEF_UNMAP_GRANULARITY 1
 117 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
 118 #define DEF_UNMAP_MAX_DESC 256
 119 #define DEF_VIRTUAL_GB   0
 120 #define DEF_VPD_USE_HOSTNO 1
 121 #define DEF_WRITESAME_LENGTH 0xFFFF
 122
 123 /* bit mask values for scsi_debug_opts */
 124 #define SCSI_DEBUG_OPT_NOISE   1
 125 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
 126 #define SCSI_DEBUG_OPT_TIMEOUT   4
 127 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
 128 #define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
 129 #define SCSI_DEBUG_OPT_DIF_ERR   32
 130 #define SCSI_DEBUG_OPT_DIX_ERR   64
 131 #define SCSI_DEBUG_OPT_MAC_TIMEOUT  128
 132 /* When "every_nth" > 0 then modulo "every_nth" commands:
 133  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
 134  *   - a RECOVERED_ERROR is simulated on successful read and write
 135  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
 136  *   - a TRANSPORT_ERROR is simulated on successful read and write
 137  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
 138  *
 139  * When "every_nth" < 0 then after "- every_nth" commands:
 140  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
 141  *   - a RECOVERED_ERROR is simulated on successful read and write
 142  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
 143  *   - a TRANSPORT_ERROR is simulated on successful read and write
 144  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
 145  * This will continue until some other action occurs (e.g. the user
 146  * writing a new value (other than -1 or 1) to every_nth via sysfs).
 147  */
 148
 149 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
 150  * sector on read commands: */
 151 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
 152 #define OPT_MEDIUM_ERR_NUM    10     /* number of consecutive medium errs */
 153
 154 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
 155  * or "peripheral device" addressing (value 0) */
 156 #define SAM2_LUN_ADDRESS_METHOD 0
 157 #define SAM2_WLUN_REPORT_LUNS 0xc101
 158
 159 /* Can queue up to this number of commands. Typically commands that
 160  * that have a non-zero delay are queued. */
 161 #define SCSI_DEBUG_CANQUEUE  255
 162
 163 static int scsi_debug_add_host = DEF_NUM_HOST;
 164 static int scsi_debug_ato = DEF_ATO;
 165 static int scsi_debug_delay = DEF_DELAY;
 166 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
 167 static int scsi_debug_dif = DEF_DIF;
 168 static int scsi_debug_dix = DEF_DIX;
 169 static int scsi_debug_dsense = DEF_D_SENSE;
 170 static int scsi_debug_every_nth = DEF_EVERY_NTH;
 171 static int scsi_debug_fake_rw = DEF_FAKE_RW;
 172 static int scsi_debug_guard = DEF_GUARD;
 173 static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
 174 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 175 static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
 176 static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
 177 static int scsi_debug_no_uld = 0;
 178 static int scsi_debug_num_parts = DEF_NUM_PARTS;
 179 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
 180 static int scsi_debug_opt_blks = DEF_OPT_BLKS;
 181 static int scsi_debug_opts = DEF_OPTS;
 182 static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
 183 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
 184 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
 185 static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
 186 static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
 187 static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
 188 static unsigned int scsi_debug_lbpu = DEF_LBPU;
 189 static unsigned int scsi_debug_lbpws = DEF_LBPWS;
 190 static unsigned int scsi_debug_lbpws10 = DEF_LBPWS10;
 191 static unsigned int scsi_debug_lbprz = DEF_LBPRZ;
 192 static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
 193 static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
 194 static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
 195 static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
 196 static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH;
 197 static bool scsi_debug_removable = DEF_REMOVABLE;
 198
 199 static int scsi_debug_cmnd_count = 0;
 200
 201 #define DEV_READONLY(TGT)      (0)
 202
 203 static unsigned int sdebug_store_sectors;
 204 static sector_t sdebug_capacity;        /* in sectors */
 205
 206 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
 207    may still need them */
 208 static int sdebug_heads;                /* heads per disk */
 209 static int sdebug_cylinders_per;        /* cylinders per surface */
 210 static int sdebug_sectors_per;          /* sectors per cylinder */
 211
 212 #define SDEBUG_MAX_PARTS 4
 213
 214 #define SDEBUG_SENSE_LEN 32
 215
 216 #define SCSI_DEBUG_MAX_CMD_LEN 32
 217
 218 static unsigned int scsi_debug_lbp(void)
 219 {
 220         return scsi_debug_lbpu | scsi_debug_lbpws | scsi_debug_lbpws10;
 221 }
 222
 223 struct sdebug_dev_info {
 224         struct list_head dev_list;
 225         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
 226         unsigned int channel;
 227         unsigned int target;
 228         unsigned int lun;
 229         struct sdebug_host_info *sdbg_host;
 230         unsigned int wlun;
 231         char reset;
 232         char stopped;
 233         char used;
 234 };
 235
 236 struct sdebug_host_info {
 237         struct list_head host_list;
 238         struct Scsi_Host *shost;
 239         struct device dev;
 240         struct list_head dev_info_list;
 241 };
 242
 243 #define to_sdebug_host(d)       \
 244         container_of(d, struct sdebug_host_info, dev)
 245
 246 static LIST_HEAD(sdebug_host_list);
 247 static DEFINE_SPINLOCK(sdebug_host_list_lock);
 248
 249 typedef void (* done_funct_t) (struct scsi_cmnd *);
 250
 251 struct sdebug_queued_cmd {
 252         int in_use;
 253         struct timer_list cmnd_timer;
 254         done_funct_t done_funct;
 255         struct scsi_cmnd * a_cmnd;
 256         int scsi_result;
 257 };
 258 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 259
 260 static unsigned char * fake_storep;     /* ramdisk storage */
 261 static unsigned char *dif_storep;       /* protection info */
 262 static void *map_storep;                /* provisioning map */
 263
 264 static unsigned long map_size;
 265 static int num_aborts = 0;
 266 static int num_dev_resets = 0;
 267 static int num_bus_resets = 0;
 268 static int num_host_resets = 0;
 269 static int dix_writes;
 270 static int dix_reads;
 271 static int dif_errors;
 272
 273 static DEFINE_SPINLOCK(queued_arr_lock);
 274 static DEFINE_RWLOCK(atomic_rw);
 275
 276 static char sdebug_proc_name[] = "scsi_debug";
 277
 278 static struct bus_type pseudo_lld_bus;
 279
 280 static inline sector_t dif_offset(sector_t sector)
 281 {
 282         return sector << 3;
 283 }
 284
 285 static struct device_driver sdebug_driverfs_driver = {
 286         .name           = sdebug_proc_name,
 287         .bus            = &pseudo_lld_bus,
 288 };
 289
 290 static const int check_condition_result =
 291                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 292
 293 static const int illegal_condition_result =
 294         (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
 295
 296 static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 297                                     0, 0, 0x2, 0x4b};
 298 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 299                                    0, 0, 0x0, 0x0};
 300
 301 static int sdebug_add_adapter(void);
 302 static void sdebug_remove_adapter(void);
 303
 304 static void sdebug_max_tgts_luns(void)
 305 {
 306         struct sdebug_host_info *sdbg_host;
 307         struct Scsi_Host *hpnt;
 308
 309         spin_lock(&sdebug_host_list_lock);
 310         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
 311                 hpnt = sdbg_host->shost;
 312                 if ((hpnt->this_id >= 0) &&
 313                     (scsi_debug_num_tgts > hpnt->this_id))
 314                         hpnt->max_id = scsi_debug_num_tgts + 1;
 315                 else
 316                         hpnt->max_id = scsi_debug_num_tgts;
 317                 /* scsi_debug_max_luns; */
 318                 hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;
 319         }
 320         spin_unlock(&sdebug_host_list_lock);
 321 }
 322
 323 static void mk_sense_buffer(struct sdebug_dev_info *devip, int key,
 324                             int asc, int asq)
 325 {
 326         unsigned char *sbuff;
 327
 328         sbuff = devip->sense_buff;
 329         memset(sbuff, 0, SDEBUG_SENSE_LEN);
 330
 331         scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, asq);
 332
 333         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 334                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
 335                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
 336 }
 337
 338 static void get_data_transfer_info(unsigned char *cmd,
 339                                    unsigned long long *lba, unsigned int *num,
 340                                    u32 *ei_lba)
 341 {
 342         *ei_lba = 0;
 343
 344         switch (*cmd) {
 345         case VARIABLE_LENGTH_CMD:
 346                 *lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
 347                         (u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
 348                         (u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
 349                         (u64)cmd[13] << 48 | (u64)cmd[12] << 56;
 350
 351                 *ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
 352                         (u32)cmd[21] << 16 | (u32)cmd[20] << 24;
 353
 354                 *num = (u32)cmd[31] | (u32)cmd[30] << 8 | (u32)cmd[29] << 16 |
 355                         (u32)cmd[28] << 24;
 356                 break;
 357
 358         case WRITE_SAME_16:
 359         case WRITE_16:
 360         case READ_16:
 361                 *lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
 362                         (u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
 363                         (u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
 364                         (u64)cmd[3] << 48 | (u64)cmd[2] << 56;
 365
 366                 *num = (u32)cmd[13] | (u32)cmd[12] << 8 | (u32)cmd[11] << 16 |
 367                         (u32)cmd[10] << 24;
 368                 break;
 369         case WRITE_12:
 370         case READ_12:
 371                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
 372                         (u32)cmd[2] << 24;
 373
 374                 *num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7] << 16 |
 375                         (u32)cmd[6] << 24;
 376                 break;
 377         case WRITE_SAME:
 378         case WRITE_10:
 379         case READ_10:
 380         case XDWRITEREAD_10:
 381                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
 382                         (u32)cmd[2] << 24;
 383
 384                 *num = (u32)cmd[8] | (u32)cmd[7] << 8;
 385                 break;
 386         case WRITE_6:
 387         case READ_6:
 388                 *lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
 389                         (u32)(cmd[1] & 0x1f) << 16;
 390                 *num = (0 == cmd[4]) ? 256 : cmd[4];
 391                 break;
 392         default:
 393                 break;
 394         }
 395 }
 396
 397 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
 398 {
 399         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
 400                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
 401         }
 402         return -EINVAL;
 403         /* return -ENOTTY; // correct return but upsets fdisk */
 404 }
 405
 406 static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
 407                            struct sdebug_dev_info * devip)
 408 {
 409         if (devip->reset) {
 410                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 411                         printk(KERN_INFO "scsi_debug: Reporting Unit "
 412                                "attention: power on reset\n");
 413                 devip->reset = 0;
 414                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
 415                 return check_condition_result;
 416         }
 417         if ((0 == reset_only) && devip->stopped) {
 418                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 419                         printk(KERN_INFO "scsi_debug: Reporting Not "
 420                                "ready: initializing command required\n");
 421                 mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
 422                                 0x2);
 423                 return check_condition_result;
 424         }
 425         return 0;
 426 }
 427
 428 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
 429 static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
 430                                 int arr_len)
 431 {
 432         int act_len;
 433         struct scsi_data_buffer *sdb = scsi_in(scp);
 434
 435         if (!sdb->length)
 436                 return 0;
 437         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
 438                 return (DID_ERROR << 16);
 439
 440         act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
 441                                       arr, arr_len);
 442         if (sdb->resid)
 443                 sdb->resid -= act_len;
 444         else
 445                 sdb->resid = scsi_bufflen(scp) - act_len;
 446
 447         return 0;
 448 }
 449
 450 /* Returns number of bytes fetched into 'arr' or -1 if error. */
 451 static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
 452                                int arr_len)
 453 {
 454         if (!scsi_bufflen(scp))
 455                 return 0;
 456         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
 457                 return -1;
 458
 459         return scsi_sg_copy_to_buffer(scp, arr, arr_len);
 460 }
 461
 462
 463 static const char * inq_vendor_id = "Linux   ";
 464 static const char * inq_product_id = "scsi_debug      ";
 465 static const char * inq_product_rev = "0004";
 466
 467 static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
 468                            int target_dev_id, int dev_id_num,
 469                            const char * dev_id_str,
 470                            int dev_id_str_len)
 471 {
 472         int num, port_a;
 473         char b[32];
 474
 475         port_a = target_dev_id + 1;
 476         /* T10 vendor identifier field format (faked) */
 477         arr[0] = 0x2;   /* ASCII */
 478         arr[1] = 0x1;
 479         arr[2] = 0x0;
 480         memcpy(&arr[4], inq_vendor_id, 8);
 481         memcpy(&arr[12], inq_product_id, 16);
 482         memcpy(&arr[28], dev_id_str, dev_id_str_len);
 483         num = 8 + 16 + dev_id_str_len;
 484         arr[3] = num;
 485         num += 4;
 486         if (dev_id_num >= 0) {
 487                 /* NAA-5, Logical unit identifier (binary) */
 488                 arr[num++] = 0x1;       /* binary (not necessarily sas) */
 489                 arr[num++] = 0x3;       /* PIV=0, lu, naa */
 490                 arr[num++] = 0x0;
 491                 arr[num++] = 0x8;
 492                 arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
 493                 arr[num++] = 0x33;
 494                 arr[num++] = 0x33;
 495                 arr[num++] = 0x30;
 496                 arr[num++] = (dev_id_num >> 24);
 497                 arr[num++] = (dev_id_num >> 16) & 0xff;
 498                 arr[num++] = (dev_id_num >> 8) & 0xff;
 499                 arr[num++] = dev_id_num & 0xff;
 500                 /* Target relative port number */
 501                 arr[num++] = 0x61;      /* proto=sas, binary */
 502                 arr[num++] = 0x94;      /* PIV=1, target port, rel port */
 503                 arr[num++] = 0x0;       /* reserved */
 504                 arr[num++] = 0x4;       /* length */
 505                 arr[num++] = 0x0;       /* reserved */
 506                 arr[num++] = 0x0;       /* reserved */
 507                 arr[num++] = 0x0;
 508                 arr[num++] = 0x1;       /* relative port A */
 509         }
 510         /* NAA-5, Target port identifier */
 511         arr[num++] = 0x61;      /* proto=sas, binary */
 512         arr[num++] = 0x93;      /* piv=1, target port, naa */
 513         arr[num++] = 0x0;
 514         arr[num++] = 0x8;
 515         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
 516         arr[num++] = 0x22;
 517         arr[num++] = 0x22;
 518         arr[num++] = 0x20;
 519         arr[num++] = (port_a >> 24);
 520         arr[num++] = (port_a >> 16) & 0xff;
 521         arr[num++] = (port_a >> 8) & 0xff;
 522         arr[num++] = port_a & 0xff;
 523         /* NAA-5, Target port group identifier */
 524         arr[num++] = 0x61;      /* proto=sas, binary */
 525         arr[num++] = 0x95;      /* piv=1, target port group id */
 526         arr[num++] = 0x0;
 527         arr[num++] = 0x4;
 528         arr[num++] = 0;
 529         arr[num++] = 0;
 530         arr[num++] = (port_group_id >> 8) & 0xff;
 531         arr[num++] = port_group_id & 0xff;
 532         /* NAA-5, Target device identifier */
 533         arr[num++] = 0x61;      /* proto=sas, binary */
 534         arr[num++] = 0xa3;      /* piv=1, target device, naa */
 535         arr[num++] = 0x0;
 536         arr[num++] = 0x8;
 537         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
 538         arr[num++] = 0x22;
 539         arr[num++] = 0x22;
 540         arr[num++] = 0x20;
 541         arr[num++] = (target_dev_id >> 24);
 542         arr[num++] = (target_dev_id >> 16) & 0xff;
 543         arr[num++] = (target_dev_id >> 8) & 0xff;
 544         arr[num++] = target_dev_id & 0xff;
 545         /* SCSI name string: Target device identifier */
 546         arr[num++] = 0x63;      /* proto=sas, UTF-8 */
 547         arr[num++] = 0xa8;      /* piv=1, target device, SCSI name string */
 548         arr[num++] = 0x0;
 549         arr[num++] = 24;
 550         memcpy(arr + num, "naa.52222220", 12);
 551         num += 12;
 552         snprintf(b, sizeof(b), "%08X", target_dev_id);
 553         memcpy(arr + num, b, 8);
 554         num += 8;
 555         memset(arr + num, 0, 4);
 556         num += 4;
 557         return num;
 558 }
 559
 560
 561 static unsigned char vpd84_data[] = {
 562 /* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
 563     0x22,0x22,0x22,0x0,0xbb,0x1,
 564     0x22,0x22,0x22,0x0,0xbb,0x2,
 565 };
 566
 567 static int inquiry_evpd_84(unsigned char * arr)
 568 {
 569         memcpy(arr, vpd84_data, sizeof(vpd84_data));
 570         return sizeof(vpd84_data);
 571 }
 572
 573 static int inquiry_evpd_85(unsigned char * arr)
 574 {
 575         int num = 0;
 576         const char * na1 = "https://www.kernel.org/config";
 577         const char * na2 = "http://www.kernel.org/log";
 578         int plen, olen;
 579
 580         arr[num++] = 0x1;       /* lu, storage config */
 581         arr[num++] = 0x0;       /* reserved */
 582         arr[num++] = 0x0;
 583         olen = strlen(na1);
 584         plen = olen + 1;
 585         if (plen % 4)
 586                 plen = ((plen / 4) + 1) * 4;
 587         arr[num++] = plen;      /* length, null termianted, padded */
 588         memcpy(arr + num, na1, olen);
 589         memset(arr + num + olen, 0, plen - olen);
 590         num += plen;
 591
 592         arr[num++] = 0x4;       /* lu, logging */
 593         arr[num++] = 0x0;       /* reserved */
 594         arr[num++] = 0x0;
 595         olen = strlen(na2);
 596         plen = olen + 1;
 597         if (plen % 4)
 598                 plen = ((plen / 4) + 1) * 4;
 599         arr[num++] = plen;      /* length, null terminated, padded */
 600         memcpy(arr + num, na2, olen);
 601         memset(arr + num + olen, 0, plen - olen);
 602         num += plen;
 603
 604         return num;
 605 }
 606
 607 /* SCSI ports VPD page */
 608 static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
 609 {
 610         int num = 0;
 611         int port_a, port_b;
 612
 613         port_a = target_dev_id + 1;
 614         port_b = port_a + 1;
 615         arr[num++] = 0x0;       /* reserved */
 616         arr[num++] = 0x0;       /* reserved */
 617         arr[num++] = 0x0;
 618         arr[num++] = 0x1;       /* relative port 1 (primary) */
 619         memset(arr + num, 0, 6);
 620         num += 6;
 621         arr[num++] = 0x0;
 622         arr[num++] = 12;        /* length tp descriptor */
 623         /* naa-5 target port identifier (A) */
 624         arr[num++] = 0x61;      /* proto=sas, binary */
 625         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
 626         arr[num++] = 0x0;       /* reserved */
 627         arr[num++] = 0x8;       /* length */
 628         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
 629         arr[num++] = 0x22;
 630         arr[num++] = 0x22;
 631         arr[num++] = 0x20;
 632         arr[num++] = (port_a >> 24);
 633         arr[num++] = (port_a >> 16) & 0xff;
 634         arr[num++] = (port_a >> 8) & 0xff;
 635         arr[num++] = port_a & 0xff;
 636
 637         arr[num++] = 0x0;       /* reserved */
 638         arr[num++] = 0x0;       /* reserved */
 639         arr[num++] = 0x0;
 640         arr[num++] = 0x2;       /* relative port 2 (secondary) */
 641         memset(arr + num, 0, 6);
 642         num += 6;
 643         arr[num++] = 0x0;
 644         arr[num++] = 12;        /* length tp descriptor */
 645         /* naa-5 target port identifier (B) */
 646         arr[num++] = 0x61;      /* proto=sas, binary */
 647         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
 648         arr[num++] = 0x0;       /* reserved */
 649         arr[num++] = 0x8;       /* length */
 650         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
 651         arr[num++] = 0x22;
 652         arr[num++] = 0x22;
 653         arr[num++] = 0x20;
 654         arr[num++] = (port_b >> 24);
 655         arr[num++] = (port_b >> 16) & 0xff;
 656         arr[num++] = (port_b >> 8) & 0xff;
 657         arr[num++] = port_b & 0xff;
 658
 659         return num;
 660 }
 661
 662
 663 static unsigned char vpd89_data[] = {
 664 /* from 4th byte */ 0,0,0,0,
 665 'l','i','n','u','x',' ',' ',' ',
 666 'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
 667 '1','2','3','4',
 668 0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
 669 0xec,0,0,0,
 670 0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
 671 0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
 672 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
 673 0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
 674 0x53,0x41,
 675 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
 676 0x20,0x20,
 677 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
 678 0x10,0x80,
 679 0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
 680 0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
 681 0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
 682 0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
 683 0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
 684 0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
 685 0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
 686 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 687 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 688 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 689 0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
 690 0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
 691 0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
 692 0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
 693 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 694 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 695 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 696 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 697 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 698 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 699 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 700 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 701 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 702 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 703 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 704 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
 705 };
 706
 707 static int inquiry_evpd_89(unsigned char * arr)
 708 {
 709         memcpy(arr, vpd89_data, sizeof(vpd89_data));
 710         return sizeof(vpd89_data);
 711 }
 712
 713
 714 /* Block limits VPD page (SBC-3) */
 715 static unsigned char vpdb0_data[] = {
 716         /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
 717         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 718         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 719         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 720 };
 721
 722 static int inquiry_evpd_b0(unsigned char * arr)
 723 {
 724         unsigned int gran;
 725
 726         memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
 727
 728         /* Optimal transfer length granularity */
 729         gran = 1 << scsi_debug_physblk_exp;
 730         arr[2] = (gran >> 8) & 0xff;
 731         arr[3] = gran & 0xff;
 732
 733         /* Maximum Transfer Length */
 734         if (sdebug_store_sectors > 0x400) {
 735                 arr[4] = (sdebug_store_sectors >> 24) & 0xff;
 736                 arr[5] = (sdebug_store_sectors >> 16) & 0xff;
 737                 arr[6] = (sdebug_store_sectors >> 8) & 0xff;
 738                 arr[7] = sdebug_store_sectors & 0xff;
 739         }
 740
 741         /* Optimal Transfer Length */
 742         put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
 743
 744         if (scsi_debug_lbpu) {
 745                 /* Maximum Unmap LBA Count */
 746                 put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]);
 747
 748                 /* Maximum Unmap Block Descriptor Count */
 749                 put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
 750         }
 751
 752         /* Unmap Granularity Alignment */
 753         if (scsi_debug_unmap_alignment) {
 754                 put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
 755                 arr[28] |= 0x80; /* UGAVALID */
 756         }
 757
 758         /* Optimal Unmap Granularity */
 759         put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
 760
 761         /* Maximum WRITE SAME Length */
 762         put_unaligned_be64(scsi_debug_write_same_length, &arr[32]);
 763
 764         return 0x3c; /* Mandatory page length for Logical Block Provisioning */
 765
 766         return sizeof(vpdb0_data);
 767 }
 768
 769 /* Block device characteristics VPD page (SBC-3) */
 770 static int inquiry_evpd_b1(unsigned char *arr)
 771 {
 772         memset(arr, 0, 0x3c);
 773         arr[0] = 0;
 774         arr[1] = 1;     /* non rotating medium (e.g. solid state) */
 775         arr[2] = 0;
 776         arr[3] = 5;     /* less than 1.8" */
 777
 778         return 0x3c;
 779 }
 780
 781 /* Logical block provisioning VPD page (SBC-3) */
 782 static int inquiry_evpd_b2(unsigned char *arr)
 783 {
 784         memset(arr, 0, 0x4);
 785         arr[0] = 0;                     /* threshold exponent */
 786
 787         if (scsi_debug_lbpu)
 788                 arr[1] = 1 << 7;
 789
 790         if (scsi_debug_lbpws)
 791                 arr[1] |= 1 << 6;
 792
 793         if (scsi_debug_lbpws10)
 794                 arr[1] |= 1 << 5;
 795
 796         if (scsi_debug_lbprz)
 797                 arr[1] |= 1 << 2;
 798
 799         return 0x4;
 800 }
 801
 802 #define SDEBUG_LONG_INQ_SZ 96
 803 #define SDEBUG_MAX_INQ_ARR_SZ 584
 804
 805 static int resp_inquiry(struct scsi_cmnd * scp, int target,
 806                         struct sdebug_dev_info * devip)
 807 {
 808         unsigned char pq_pdt;
 809         unsigned char * arr;
 810         unsigned char *cmd = (unsigned char *)scp->cmnd;
 811         int alloc_len, n, ret;
 812
 813         alloc_len = (cmd[3] << 8) + cmd[4];
 814         arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
 815         if (! arr)
 816                 return DID_REQUEUE << 16;
 817         if (devip->wlun)
 818                 pq_pdt = 0x1e;  /* present, wlun */
 819         else if (scsi_debug_no_lun_0 && (0 == devip->lun))
 820                 pq_pdt = 0x7f;  /* not present, no device type */
 821         else
 822                 pq_pdt = (scsi_debug_ptype & 0x1f);
 823         arr[0] = pq_pdt;
 824         if (0x2 & cmd[1]) {  /* CMDDT bit set */
 825                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 826                                 0);
 827                 kfree(arr);
 828                 return check_condition_result;
 829         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
 830                 int lu_id_num, port_group_id, target_dev_id, len;
 831                 char lu_id_str[6];
 832                 int host_no = devip->sdbg_host->shost->host_no;
 833
 834                 port_group_id = (((host_no + 1) & 0x7f) << 8) +
 835                     (devip->channel & 0x7f);
 836                 if (0 == scsi_debug_vpd_use_hostno)
 837                         host_no = 0;
 838                 lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
 839                             (devip->target * 1000) + devip->lun);
 840                 target_dev_id = ((host_no + 1) * 2000) +
 841                                  (devip->target * 1000) - 3;
 842                 len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
 843                 if (0 == cmd[2]) { /* supported vital product data pages */
 844                         arr[1] = cmd[2];        /*sanity */
 845                         n = 4;
 846                         arr[n++] = 0x0;   /* this page */
 847                         arr[n++] = 0x80;  /* unit serial number */
 848                         arr[n++] = 0x83;  /* device identification */
 849                         arr[n++] = 0x84;  /* software interface ident. */
 850                         arr[n++] = 0x85;  /* management network addresses */
 851                         arr[n++] = 0x86;  /* extended inquiry */
 852                         arr[n++] = 0x87;  /* mode page policy */
 853                         arr[n++] = 0x88;  /* SCSI ports */
 854                         arr[n++] = 0x89;  /* ATA information */
 855                         arr[n++] = 0xb0;  /* Block limits (SBC) */
 856                         arr[n++] = 0xb1;  /* Block characteristics (SBC) */
 857                         if (scsi_debug_lbp()) /* Logical Block Prov. (SBC) */
 858                                 arr[n++] = 0xb2;
 859                         arr[3] = n - 4;   /* number of supported VPD pages */
 860                 } else if (0x80 == cmd[2]) { /* unit serial number */
 861                         arr[1] = cmd[2];        /*sanity */
 862                         arr[3] = len;
 863                         memcpy(&arr[4], lu_id_str, len);
 864                 } else if (0x83 == cmd[2]) { /* device identification */
 865                         arr[1] = cmd[2];        /*sanity */
 866                         arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
 867                                                  target_dev_id, lu_id_num,
 868                                                  lu_id_str, len);
 869                 } else if (0x84 == cmd[2]) { /* Software interface ident. */
 870                         arr[1] = cmd[2];        /*sanity */
 871                         arr[3] = inquiry_evpd_84(&arr[4]);
 872                 } else if (0x85 == cmd[2]) { /* Management network addresses */
 873                         arr[1] = cmd[2];        /*sanity */
 874                         arr[3] = inquiry_evpd_85(&arr[4]);
 875                 } else if (0x86 == cmd[2]) { /* extended inquiry */
 876                         arr[1] = cmd[2];        /*sanity */
 877                         arr[3] = 0x3c;  /* number of following entries */
 878                         if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION)
 879                                 arr[4] = 0x4;   /* SPT: GRD_CHK:1 */
 880                         else if (scsi_debug_dif)
 881                                 arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
 882                         else
 883                                 arr[4] = 0x0;   /* no protection stuff */
 884                         arr[5] = 0x7;   /* head of q, ordered + simple q's */
 885                 } else if (0x87 == cmd[2]) { /* mode page policy */
 886                         arr[1] = cmd[2];        /*sanity */
 887                         arr[3] = 0x8;   /* number of following entries */
 888                         arr[4] = 0x2;   /* disconnect-reconnect mp */
 889                         arr[6] = 0x80;  /* mlus, shared */
 890                         arr[8] = 0x18;   /* protocol specific lu */
 891                         arr[10] = 0x82;  /* mlus, per initiator port */
 892                 } else if (0x88 == cmd[2]) { /* SCSI Ports */
 893                         arr[1] = cmd[2];        /*sanity */
 894                         arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
 895                 } else if (0x89 == cmd[2]) { /* ATA information */
 896                         arr[1] = cmd[2];        /*sanity */
 897                         n = inquiry_evpd_89(&arr[4]);
 898                         arr[2] = (n >> 8);
 899                         arr[3] = (n & 0xff);
 900                 } else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
 901                         arr[1] = cmd[2];        /*sanity */
 902                         arr[3] = inquiry_evpd_b0(&arr[4]);
 903                 } else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */
 904                         arr[1] = cmd[2];        /*sanity */
 905                         arr[3] = inquiry_evpd_b1(&arr[4]);
 906                 } else if (0xb2 == cmd[2]) { /* Logical Block Prov. (SBC) */
 907                         arr[1] = cmd[2];        /*sanity */
 908                         arr[3] = inquiry_evpd_b2(&arr[4]);
 909                 } else {
 910                         /* Illegal request, invalid field in cdb */
 911                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
 912                                         INVALID_FIELD_IN_CDB, 0);
 913                         kfree(arr);
 914                         return check_condition_result;
 915                 }
 916                 len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
 917                 ret = fill_from_dev_buffer(scp, arr,
 918                             min(len, SDEBUG_MAX_INQ_ARR_SZ));
 919                 kfree(arr);
 920                 return ret;
 921         }
 922         /* drops through here for a standard inquiry */
 923         arr[1] = scsi_debug_removable ? 0x80 : 0;       /* Removable disk */
 924         arr[2] = scsi_debug_scsi_level;
 925         arr[3] = 2;    /* response_data_format==2 */
 926         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
 927         arr[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */
 928         if (0 == scsi_debug_vpd_use_hostno)
 929                 arr[5] = 0x10; /* claim: implicit TGPS */
 930         arr[6] = 0x10; /* claim: MultiP */
 931         /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
 932         arr[7] = 0xa; /* claim: LINKED + CMDQUE */
 933         memcpy(&arr[8], inq_vendor_id, 8);
 934         memcpy(&arr[16], inq_product_id, 16);
 935         memcpy(&arr[32], inq_product_rev, 4);
 936         /* version descriptors (2 bytes each) follow */
 937         arr[58] = 0x0; arr[59] = 0x77; /* SAM-3 ANSI */
 938         arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
 939         n = 62;
 940         if (scsi_debug_ptype == 0) {
 941                 arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
 942         } else if (scsi_debug_ptype == 1) {
 943                 arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
 944         }
 945         arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
 946         ret = fill_from_dev_buffer(scp, arr,
 947                             min(alloc_len, SDEBUG_LONG_INQ_SZ));
 948         kfree(arr);
 949         return ret;
 950 }
 951
 952 static int resp_requests(struct scsi_cmnd * scp,
 953                          struct sdebug_dev_info * devip)
 954 {
 955         unsigned char * sbuff;
 956         unsigned char *cmd = (unsigned char *)scp->cmnd;
 957         unsigned char arr[SDEBUG_SENSE_LEN];
 958         int want_dsense;
 959         int len = 18;
 960
 961         memset(arr, 0, sizeof(arr));
 962         if (devip->reset == 1)
 963                 mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
 964         want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
 965         sbuff = devip->sense_buff;
 966         if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
 967                 if (want_dsense) {
 968                         arr[0] = 0x72;
 969                         arr[1] = 0x0;           /* NO_SENSE in sense_key */
 970                         arr[2] = THRESHOLD_EXCEEDED;
 971                         arr[3] = 0xff;          /* TEST set and MRIE==6 */
 972                 } else {
 973                         arr[0] = 0x70;
 974                         arr[2] = 0x0;           /* NO_SENSE in sense_key */
 975                         arr[7] = 0xa;           /* 18 byte sense buffer */
 976                         arr[12] = THRESHOLD_EXCEEDED;
 977                         arr[13] = 0xff;         /* TEST set and MRIE==6 */
 978                 }
 979         } else {
 980                 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
 981                 if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
 982                         /* DESC bit set and sense_buff in fixed format */
 983                         memset(arr, 0, sizeof(arr));
 984                         arr[0] = 0x72;
 985                         arr[1] = sbuff[2];     /* sense key */
 986                         arr[2] = sbuff[12];    /* asc */
 987                         arr[3] = sbuff[13];    /* ascq */
 988                         len = 8;
 989                 }
 990         }
 991         mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
 992         return fill_from_dev_buffer(scp, arr, len);
 993 }
 994
 995 static int resp_start_stop(struct scsi_cmnd * scp,
 996                            struct sdebug_dev_info * devip)
 997 {
 998         unsigned char *cmd = (unsigned char *)scp->cmnd;
 999         int power_cond, errsts, start;
1000
1001         if ((errsts = check_readiness(scp, 1, devip)))
1002                 return errsts;
1003         power_cond = (cmd[4] & 0xf0) >> 4;
1004         if (power_cond) {
1005                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1006                                 0);
1007                 return check_condition_result;
1008         }
1009         start = cmd[4] & 1;
1010         if (start == devip->stopped)
1011                 devip->stopped = !start;
1012         return 0;
1013 }
1014
1015 static sector_t get_sdebug_capacity(void)
1016 {
1017         if (scsi_debug_virtual_gb > 0)
1018                 return (sector_t)scsi_debug_virtual_gb *
1019                         (1073741824 / scsi_debug_sector_size);
1020         else
1021                 return sdebug_store_sectors;
1022 }
1023
1024 #define SDEBUG_READCAP_ARR_SZ 8
1025 static int resp_readcap(struct scsi_cmnd * scp,
1026                         struct sdebug_dev_info * devip)
1027 {
1028         unsigned char arr[SDEBUG_READCAP_ARR_SZ];
1029         unsigned int capac;
1030         int errsts;
1031
1032         if ((errsts = check_readiness(scp, 1, devip)))
1033                 return errsts;
1034         /* following just in case virtual_gb changed */
1035         sdebug_capacity = get_sdebug_capacity();
1036         memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
1037         if (sdebug_capacity < 0xffffffff) {
1038                 capac = (unsigned int)sdebug_capacity - 1;
1039                 arr[0] = (capac >> 24);
1040                 arr[1] = (capac >> 16) & 0xff;
1041                 arr[2] = (capac >> 8) & 0xff;
1042                 arr[3] = capac & 0xff;
1043         } else {
1044                 arr[0] = 0xff;
1045                 arr[1] = 0xff;
1046                 arr[2] = 0xff;
1047                 arr[3] = 0xff;
1048         }
1049         arr[6] = (scsi_debug_sector_size >> 8) & 0xff;
1050         arr[7] = scsi_debug_sector_size & 0xff;
1051         return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
1052 }
1053
1054 #define SDEBUG_READCAP16_ARR_SZ 32
1055 static int resp_readcap16(struct scsi_cmnd * scp,
1056                           struct sdebug_dev_info * devip)
1057 {
1058         unsigned char *cmd = (unsigned char *)scp->cmnd;
1059         unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
1060         unsigned long long capac;
1061         int errsts, k, alloc_len;
1062
1063         if ((errsts = check_readiness(scp, 1, devip)))
1064                 return errsts;
1065         alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
1066                      + cmd[13]);
1067         /* following just in case virtual_gb changed */
1068         sdebug_capacity = get_sdebug_capacity();
1069         memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
1070         capac = sdebug_capacity - 1;
1071         for (k = 0; k < 8; ++k, capac >>= 8)
1072                 arr[7 - k] = capac & 0xff;
1073         arr[8] = (scsi_debug_sector_size >> 24) & 0xff;
1074         arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
1075         arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
1076         arr[11] = scsi_debug_sector_size & 0xff;
1077         arr[13] = scsi_debug_physblk_exp & 0xf;
1078         arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
1079
1080         if (scsi_debug_lbp()) {
1081                 arr[14] |= 0x80; /* LBPME */
1082                 if (scsi_debug_lbprz)
1083                         arr[14] |= 0x40; /* LBPRZ */
1084         }
1085
1086         arr[15] = scsi_debug_lowest_aligned & 0xff;
1087
1088         if (scsi_debug_dif) {
1089                 arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
1090                 arr[12] |= 1; /* PROT_EN */
1091         }
1092
1093         return fill_from_dev_buffer(scp, arr,
1094                                     min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
1095 }
1096
1097 #define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
1098
1099 static int resp_report_tgtpgs(struct scsi_cmnd * scp,
1100                               struct sdebug_dev_info * devip)
1101 {
1102         unsigned char *cmd = (unsigned char *)scp->cmnd;
1103         unsigned char * arr;
1104         int host_no = devip->sdbg_host->shost->host_no;
1105         int n, ret, alen, rlen;
1106         int port_group_a, port_group_b, port_a, port_b;
1107
1108         alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
1109                 + cmd[9]);
1110
1111         arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
1112         if (! arr)
1113                 return DID_REQUEUE << 16;
1114         /*
1115          * EVPD page 0x88 states we have two ports, one
1116          * real and a fake port with no device connected.
1117          * So we create two port groups with one port each
1118          * and set the group with port B to unavailable.
1119          */
1120         port_a = 0x1; /* relative port A */
1121         port_b = 0x2; /* relative port B */
1122         port_group_a = (((host_no + 1) & 0x7f) << 8) +
1123             (devip->channel & 0x7f);
1124         port_group_b = (((host_no + 1) & 0x7f) << 8) +
1125             (devip->channel & 0x7f) + 0x80;
1126
1127         /*
1128          * The asymmetric access state is cycled according to the host_id.
1129          */
1130         n = 4;
1131         if (0 == scsi_debug_vpd_use_hostno) {
1132             arr[n++] = host_no % 3; /* Asymm access state */
1133             arr[n++] = 0x0F; /* claim: all states are supported */
1134         } else {
1135             arr[n++] = 0x0; /* Active/Optimized path */
1136             arr[n++] = 0x01; /* claim: only support active/optimized paths */
1137         }
1138         arr[n++] = (port_group_a >> 8) & 0xff;
1139         arr[n++] = port_group_a & 0xff;
1140         arr[n++] = 0;    /* Reserved */
1141         arr[n++] = 0;    /* Status code */
1142         arr[n++] = 0;    /* Vendor unique */
1143         arr[n++] = 0x1;  /* One port per group */
1144         arr[n++] = 0;    /* Reserved */
1145         arr[n++] = 0;    /* Reserved */
1146         arr[n++] = (port_a >> 8) & 0xff;
1147         arr[n++] = port_a & 0xff;
1148         arr[n++] = 3;    /* Port unavailable */
1149         arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
1150         arr[n++] = (port_group_b >> 8) & 0xff;
1151         arr[n++] = port_group_b & 0xff;
1152         arr[n++] = 0;    /* Reserved */
1153         arr[n++] = 0;    /* Status code */
1154         arr[n++] = 0;    /* Vendor unique */
1155         arr[n++] = 0x1;  /* One port per group */
1156         arr[n++] = 0;    /* Reserved */
1157         arr[n++] = 0;    /* Reserved */
1158         arr[n++] = (port_b >> 8) & 0xff;
1159         arr[n++] = port_b & 0xff;
1160
1161         rlen = n - 4;
1162         arr[0] = (rlen >> 24) & 0xff;
1163         arr[1] = (rlen >> 16) & 0xff;
1164         arr[2] = (rlen >> 8) & 0xff;
1165         arr[3] = rlen & 0xff;
1166
1167         /*
1168          * Return the smallest value of either
1169          * - The allocated length
1170          * - The constructed command length
1171          * - The maximum array size
1172          */
1173         rlen = min(alen,n);
1174         ret = fill_from_dev_buffer(scp, arr,
1175                                    min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
1176         kfree(arr);
1177         return ret;
1178 }
1179
1180 /* <<Following mode page info copied from ST318451LW>> */
1181
1182 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
1183 {       /* Read-Write Error Recovery page for mode_sense */
1184         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
1185                                         5, 0, 0xff, 0xff};
1186
1187         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
1188         if (1 == pcontrol)
1189                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
1190         return sizeof(err_recov_pg);
1191 }
1192
1193 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
1194 {       /* Disconnect-Reconnect page for mode_sense */
1195         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
1196                                          0, 0, 0, 0, 0, 0, 0, 0};
1197
1198         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
1199         if (1 == pcontrol)
1200                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
1201         return sizeof(disconnect_pg);
1202 }
1203
1204 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
1205 {       /* Format device page for mode_sense */
1206         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
1207                                      0, 0, 0, 0, 0, 0, 0, 0,
1208                                      0, 0, 0, 0, 0x40, 0, 0, 0};
1209
1210         memcpy(p, format_pg, sizeof(format_pg));
1211         p[10] = (sdebug_sectors_per >> 8) & 0xff;
1212         p[11] = sdebug_sectors_per & 0xff;
1213         p[12] = (scsi_debug_sector_size >> 8) & 0xff;
1214         p[13] = scsi_debug_sector_size & 0xff;
1215         if (scsi_debug_removable)
1216                 p[20] |= 0x20; /* should agree with INQUIRY */
1217         if (1 == pcontrol)
1218                 memset(p + 2, 0, sizeof(format_pg) - 2);
1219         return sizeof(format_pg);
1220 }
1221
1222 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
1223 {       /* Caching page for mode_sense */
1224         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1225                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
1226
1227         memcpy(p, caching_pg, sizeof(caching_pg));
1228         if (1 == pcontrol)
1229                 memset(p + 2, 0, sizeof(caching_pg) - 2);
1230         return sizeof(caching_pg);
1231 }
1232
1233 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
1234 {       /* Control mode page for mode_sense */
1235         unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
1236                                         0, 0, 0, 0};
1237         unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1238                                      0, 0, 0x2, 0x4b};
1239
1240         if (scsi_debug_dsense)
1241                 ctrl_m_pg[2] |= 0x4;
1242         else
1243                 ctrl_m_pg[2] &= ~0x4;
1244
1245         if (scsi_debug_ato)
1246                 ctrl_m_pg[5] |= 0x80; /* ATO=1 */
1247
1248         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
1249         if (1 == pcontrol)
1250                 memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
1251         else if (2 == pcontrol)
1252                 memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
1253         return sizeof(ctrl_m_pg);
1254 }
1255
1256
1257 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
1258 {       /* Informational Exceptions control mode page for mode_sense */
1259         unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
1260                                        0, 0, 0x0, 0x0};
1261         unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1262                                       0, 0, 0x0, 0x0};
1263
1264         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
1265         if (1 == pcontrol)
1266                 memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
1267         else if (2 == pcontrol)
1268                 memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
1269         return sizeof(iec_m_pg);
1270 }
1271
1272 static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
1273 {       /* SAS SSP mode page - short format for mode_sense */
1274         unsigned char sas_sf_m_pg[] = {0x19, 0x6,
1275                 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
1276
1277         memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
1278         if (1 == pcontrol)
1279                 memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
1280         return sizeof(sas_sf_m_pg);
1281 }
1282
1283
1284 static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
1285                               int target_dev_id)
1286 {       /* SAS phy control and discover mode page for mode_sense */
1287         unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
1288                     0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
1289                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1290                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1291                     0x2, 0, 0, 0, 0, 0, 0, 0,
1292                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1293                     0, 0, 0, 0, 0, 0, 0, 0,
1294                     0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
1295                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1296                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1297                     0x3, 0, 0, 0, 0, 0, 0, 0,
1298                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1299                     0, 0, 0, 0, 0, 0, 0, 0,
1300                 };
1301         int port_a, port_b;
1302
1303         port_a = target_dev_id + 1;
1304         port_b = port_a + 1;
1305         memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
1306         p[20] = (port_a >> 24);
1307         p[21] = (port_a >> 16) & 0xff;
1308         p[22] = (port_a >> 8) & 0xff;
1309         p[23] = port_a & 0xff;
1310         p[48 + 20] = (port_b >> 24);
1311         p[48 + 21] = (port_b >> 16) & 0xff;
1312         p[48 + 22] = (port_b >> 8) & 0xff;
1313         p[48 + 23] = port_b & 0xff;
1314         if (1 == pcontrol)
1315                 memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
1316         return sizeof(sas_pcd_m_pg);
1317 }
1318
1319 static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
1320 {       /* SAS SSP shared protocol specific port mode subpage */
1321         unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
1322                     0, 0, 0, 0, 0, 0, 0, 0,
1323                 };
1324
1325         memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
1326         if (1 == pcontrol)
1327                 memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
1328         return sizeof(sas_sha_m_pg);
1329 }
1330
1331 #define SDEBUG_MAX_MSENSE_SZ 256
1332
1333 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
1334                            struct sdebug_dev_info * devip)
1335 {
1336         unsigned char dbd, llbaa;
1337         int pcontrol, pcode, subpcode, bd_len;
1338         unsigned char dev_spec;
1339         int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
1340         unsigned char * ap;
1341         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
1342         unsigned char *cmd = (unsigned char *)scp->cmnd;
1343
1344         if ((errsts = check_readiness(scp, 1, devip)))
1345                 return errsts;
1346         dbd = !!(cmd[1] & 0x8);
1347         pcontrol = (cmd[2] & 0xc0) >> 6;
1348         pcode = cmd[2] & 0x3f;
1349         subpcode = cmd[3];
1350         msense_6 = (MODE_SENSE == cmd[0]);
1351         llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
1352         if ((0 == scsi_debug_ptype) && (0 == dbd))
1353                 bd_len = llbaa ? 16 : 8;
1354         else
1355                 bd_len = 0;
1356         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
1357         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
1358         if (0x3 == pcontrol) {  /* Saving values not supported */
1359                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
1360                                 0);
1361                 return check_condition_result;
1362         }
1363         target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
1364                         (devip->target * 1000) - 3;
1365         /* set DPOFUA bit for disks */
1366         if (0 == scsi_debug_ptype)
1367                 dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
1368         else
1369                 dev_spec = 0x0;
1370         if (msense_6) {
1371                 arr[2] = dev_spec;
1372                 arr[3] = bd_len;
1373                 offset = 4;
1374         } else {
1375                 arr[3] = dev_spec;
1376                 if (16 == bd_len)
1377                         arr[4] = 0x1;   /* set LONGLBA bit */
1378                 arr[7] = bd_len;        /* assume 255 or less */
1379                 offset = 8;
1380         }
1381         ap = arr + offset;
1382         if ((bd_len > 0) && (!sdebug_capacity))
1383                 sdebug_capacity = get_sdebug_capacity();
1384
1385         if (8 == bd_len) {
1386                 if (sdebug_capacity > 0xfffffffe) {
1387                         ap[0] = 0xff;
1388                         ap[1] = 0xff;
1389                         ap[2] = 0xff;
1390                         ap[3] = 0xff;
1391                 } else {
1392                         ap[0] = (sdebug_capacity >> 24) & 0xff;
1393                         ap[1] = (sdebug_capacity >> 16) & 0xff;
1394                         ap[2] = (sdebug_capacity >> 8) & 0xff;
1395                         ap[3] = sdebug_capacity & 0xff;
1396                 }
1397                 ap[6] = (scsi_debug_sector_size >> 8) & 0xff;
1398                 ap[7] = scsi_debug_sector_size & 0xff;
1399                 offset += bd_len;
1400                 ap = arr + offset;
1401         } else if (16 == bd_len) {
1402                 unsigned long long capac = sdebug_capacity;
1403
1404                 for (k = 0; k < 8; ++k, capac >>= 8)
1405                         ap[7 - k] = capac & 0xff;
1406                 ap[12] = (scsi_debug_sector_size >> 24) & 0xff;
1407                 ap[13] = (scsi_debug_sector_size >> 16) & 0xff;
1408                 ap[14] = (scsi_debug_sector_size >> 8) & 0xff;
1409                 ap[15] = scsi_debug_sector_size & 0xff;
1410                 offset += bd_len;
1411                 ap = arr + offset;
1412         }
1413
1414         if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
1415                 /* TODO: Control Extension page */
1416                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1417                                 0);
1418                 return check_condition_result;
1419         }
1420         switch (pcode) {
1421         case 0x1:       /* Read-Write error recovery page, direct access */
1422                 len = resp_err_recov_pg(ap, pcontrol, target);
1423                 offset += len;
1424                 break;
1425         case 0x2:       /* Disconnect-Reconnect page, all devices */
1426                 len = resp_disconnect_pg(ap, pcontrol, target);
1427                 offset += len;
1428                 break;
1429         case 0x3:       /* Format device page, direct access */
1430                 len = resp_format_pg(ap, pcontrol, target);
1431                 offset += len;
1432                 break;
1433         case 0x8:       /* Caching page, direct access */
1434                 len = resp_caching_pg(ap, pcontrol, target);
1435                 offset += len;
1436                 break;
1437         case 0xa:       /* Control Mode page, all devices */
1438                 len = resp_ctrl_m_pg(ap, pcontrol, target);
1439                 offset += len;
1440                 break;
1441         case 0x19:      /* if spc==1 then sas phy, control+discover */
1442                 if ((subpcode > 0x2) && (subpcode < 0xff)) {
1443                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1444                                         INVALID_FIELD_IN_CDB, 0);
1445                         return check_condition_result;
1446                 }
1447                 len = 0;
1448                 if ((0x0 == subpcode) || (0xff == subpcode))
1449                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1450                 if ((0x1 == subpcode) || (0xff == subpcode))
1451                         len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
1452                                                   target_dev_id);
1453                 if ((0x2 == subpcode) || (0xff == subpcode))
1454                         len += resp_sas_sha_m_spg(ap + len, pcontrol);
1455                 offset += len;
1456                 break;
1457         case 0x1c:      /* Informational Exceptions Mode page, all devices */
1458                 len = resp_iec_m_pg(ap, pcontrol, target);
1459                 offset += len;
1460                 break;
1461         case 0x3f:      /* Read all Mode pages */
1462                 if ((0 == subpcode) || (0xff == subpcode)) {
1463                         len = resp_err_recov_pg(ap, pcontrol, target);
1464                         len += resp_disconnect_pg(ap + len, pcontrol, target);
1465                         len += resp_format_pg(ap + len, pcontrol, target);
1466                         len += resp_caching_pg(ap + len, pcontrol, target);
1467                         len += resp_ctrl_m_pg(ap + len, pcontrol, target);
1468                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1469                         if (0xff == subpcode) {
1470                                 len += resp_sas_pcd_m_spg(ap + len, pcontrol,
1471                                                   target, target_dev_id);
1472                                 len += resp_sas_sha_m_spg(ap + len, pcontrol);
1473                         }
1474                         len += resp_iec_m_pg(ap + len, pcontrol, target);
1475                 } else {
1476                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1477                                         INVALID_FIELD_IN_CDB, 0);
1478                         return check_condition_result;
1479                 }
1480                 offset += len;
1481                 break;
1482         default:
1483                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1484                                 0);
1485                 return check_condition_result;
1486         }
1487         if (msense_6)
1488                 arr[0] = offset - 1;
1489         else {
1490                 arr[0] = ((offset - 2) >> 8) & 0xff;
1491                 arr[1] = (offset - 2) & 0xff;
1492         }
1493         return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
1494 }
1495
1496 #define SDEBUG_MAX_MSELECT_SZ 512
1497
1498 static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
1499                             struct sdebug_dev_info * devip)
1500 {
1501         int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
1502         int param_len, res, errsts, mpage;
1503         unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
1504         unsigned char *cmd = (unsigned char *)scp->cmnd;
1505
1506         if ((errsts = check_readiness(scp, 1, devip)))
1507                 return errsts;
1508         memset(arr, 0, sizeof(arr));
1509         pf = cmd[1] & 0x10;
1510         sp = cmd[1] & 0x1;
1511         param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]);
1512         if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
1513                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1514                                 INVALID_FIELD_IN_CDB, 0);
1515                 return check_condition_result;
1516         }
1517         res = fetch_to_dev_buffer(scp, arr, param_len);
1518         if (-1 == res)
1519                 return (DID_ERROR << 16);
1520         else if ((res < param_len) &&
1521                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
1522                 printk(KERN_INFO "scsi_debug: mode_select: cdb indicated=%d, "
1523                        " IO sent=%d bytes\n", param_len, res);
1524         md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);
1525         bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);
1526         if (md_len > 2) {
1527                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1528                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1529                 return check_condition_result;
1530         }
1531         off = bd_len + (mselect6 ? 4 : 8);
1532         mpage = arr[off] & 0x3f;
1533         ps = !!(arr[off] & 0x80);
1534         if (ps) {
1535                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1536                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1537                 return check_condition_result;
1538         }
1539         spf = !!(arr[off] & 0x40);
1540         pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) :
1541                        (arr[off + 1] + 2);
1542         if ((pg_len + off) > param_len) {
1543                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1544                                 PARAMETER_LIST_LENGTH_ERR, 0);
1545                 return check_condition_result;
1546         }
1547         switch (mpage) {
1548         case 0xa:      /* Control Mode page */
1549                 if (ctrl_m_pg[1] == arr[off + 1]) {
1550                         memcpy(ctrl_m_pg + 2, arr + off + 2,
1551                                sizeof(ctrl_m_pg) - 2);
1552                         scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4);
1553                         return 0;
1554                 }
1555                 break;
1556         case 0x1c:      /* Informational Exceptions Mode page */
1557                 if (iec_m_pg[1] == arr[off + 1]) {
1558                         memcpy(iec_m_pg + 2, arr + off + 2,
1559                                sizeof(iec_m_pg) - 2);
1560                         return 0;
1561                 }
1562                 break;
1563         default:
1564                 break;
1565         }
1566         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1567                         INVALID_FIELD_IN_PARAM_LIST, 0);
1568         return check_condition_result;
1569 }
1570
1571 static int resp_temp_l_pg(unsigned char * arr)
1572 {
1573         unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
1574                                      0x0, 0x1, 0x3, 0x2, 0x0, 65,
1575                 };
1576
1577         memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
1578         return sizeof(temp_l_pg);
1579 }
1580
1581 static int resp_ie_l_pg(unsigned char * arr)
1582 {
1583         unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
1584                 };
1585
1586         memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
1587         if (iec_m_pg[2] & 0x4) {        /* TEST bit set */
1588                 arr[4] = THRESHOLD_EXCEEDED;
1589                 arr[5] = 0xff;
1590         }
1591         return sizeof(ie_l_pg);
1592 }
1593
1594 #define SDEBUG_MAX_LSENSE_SZ 512
1595
1596 static int resp_log_sense(struct scsi_cmnd * scp,
1597                           struct sdebug_dev_info * devip)
1598 {
1599         int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;
1600         unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
1601         unsigned char *cmd = (unsigned char *)scp->cmnd;
1602
1603         if ((errsts = check_readiness(scp, 1, devip)))
1604                 return errsts;
1605         memset(arr, 0, sizeof(arr));
1606         ppc = cmd[1] & 0x2;
1607         sp = cmd[1] & 0x1;
1608         if (ppc || sp) {
1609                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1610                                 INVALID_FIELD_IN_CDB, 0);
1611                 return check_condition_result;
1612         }
1613         pcontrol = (cmd[2] & 0xc0) >> 6;
1614         pcode = cmd[2] & 0x3f;
1615         subpcode = cmd[3] & 0xff;
1616         alloc_len = (cmd[7] << 8) + cmd[8];
1617         arr[0] = pcode;
1618         if (0 == subpcode) {
1619                 switch (pcode) {
1620                 case 0x0:       /* Supported log pages log page */
1621                         n = 4;
1622                         arr[n++] = 0x0;         /* this page */
1623                         arr[n++] = 0xd;         /* Temperature */
1624                         arr[n++] = 0x2f;        /* Informational exceptions */
1625                         arr[3] = n - 4;
1626                         break;
1627                 case 0xd:       /* Temperature log page */
1628                         arr[3] = resp_temp_l_pg(arr + 4);
1629                         break;
1630                 case 0x2f:      /* Informational exceptions log page */
1631                         arr[3] = resp_ie_l_pg(arr + 4);
1632                         break;
1633                 default:
1634                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1635                                         INVALID_FIELD_IN_CDB, 0);
1636                         return check_condition_result;
1637                 }
1638         } else if (0xff == subpcode) {
1639                 arr[0] |= 0x40;
1640                 arr[1] = subpcode;
1641                 switch (pcode) {
1642                 case 0x0:       /* Supported log pages and subpages log page */
1643                         n = 4;
1644                         arr[n++] = 0x0;
1645                         arr[n++] = 0x0;         /* 0,0 page */
1646                         arr[n++] = 0x0;
1647                         arr[n++] = 0xff;        /* this page */
1648                         arr[n++] = 0xd;
1649                         arr[n++] = 0x0;         /* Temperature */
1650                         arr[n++] = 0x2f;
1651                         arr[n++] = 0x0; /* Informational exceptions */
1652                         arr[3] = n - 4;
1653                         break;
1654                 case 0xd:       /* Temperature subpages */
1655                         n = 4;
1656                         arr[n++] = 0xd;
1657                         arr[n++] = 0x0;         /* Temperature */
1658                         arr[3] = n - 4;
1659                         break;
1660                 case 0x2f:      /* Informational exceptions subpages */
1661                         n = 4;
1662                         arr[n++] = 0x2f;
1663                         arr[n++] = 0x0;         /* Informational exceptions */
1664                         arr[3] = n - 4;
1665                         break;
1666                 default:
1667                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1668                                         INVALID_FIELD_IN_CDB, 0);
1669                         return check_condition_result;
1670                 }
1671         } else {
1672                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1673                                 INVALID_FIELD_IN_CDB, 0);
1674                 return check_condition_result;
1675         }
1676         len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
1677         return fill_from_dev_buffer(scp, arr,
1678                     min(len, SDEBUG_MAX_INQ_ARR_SZ));
1679 }
1680
1681 static int check_device_access_params(struct sdebug_dev_info *devi,
1682                                       unsigned long long lba, unsigned int num)
1683 {
1684         if (lba + num > sdebug_capacity) {
1685                 mk_sense_buffer(devi, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0);
1686                 return check_condition_result;
1687         }
1688         /* transfer length excessive (tie in to block limits VPD page) */
1689         if (num > sdebug_store_sectors) {
1690                 mk_sense_buffer(devi, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
1691                 return check_condition_result;
1692         }
1693         return 0;
1694 }
1695
1696 static int do_device_access(struct scsi_cmnd *scmd,
1697                             struct sdebug_dev_info *devi,
1698                             unsigned long long lba, unsigned int num, int write)
1699 {
1700         int ret;
1701         unsigned long long block, rest = 0;
1702         int (*func)(struct scsi_cmnd *, unsigned char *, int);
1703
1704         func = write ? fetch_to_dev_buffer : fill_from_dev_buffer;
1705
1706         block = do_div(lba, sdebug_store_sectors);
1707         if (block + num > sdebug_store_sectors)
1708                 rest = block + num - sdebug_store_sectors;
1709
1710         ret = func(scmd, fake_storep + (block * scsi_debug_sector_size),
1711                    (num - rest) * scsi_debug_sector_size);
1712         if (!ret && rest)
1713                 ret = func(scmd, fake_storep, rest * scsi_debug_sector_size);
1714
1715         return ret;
1716 }
1717
1718 static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
1719                             unsigned int sectors, u32 ei_lba)
1720 {
1721         unsigned int i, resid;
1722         struct scatterlist *psgl;
1723         struct sd_dif_tuple *sdt;
1724         sector_t sector;
1725         sector_t tmp_sec = start_sec;
1726         void *paddr;
1727
1728         start_sec = do_div(tmp_sec, sdebug_store_sectors);
1729
1730         sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
1731
1732         for (i = 0 ; i < sectors ; i++) {
1733                 u16 csum;
1734
1735                 if (sdt[i].app_tag == 0xffff)
1736                         continue;
1737
1738                 sector = start_sec + i;
1739
1740                 switch (scsi_debug_guard) {
1741                 case 1:
1742                         csum = ip_compute_csum(fake_storep +
1743                                                sector * scsi_debug_sector_size,
1744                                                scsi_debug_sector_size);
1745                         break;
1746                 case 0:
1747                         csum = crc_t10dif(fake_storep +
1748                                           sector * scsi_debug_sector_size,
1749                                           scsi_debug_sector_size);
1750                         csum = cpu_to_be16(csum);
1751                         break;
1752                 default:
1753                         BUG();
1754                 }
1755
1756                 if (sdt[i].guard_tag != csum) {
1757                         printk(KERN_ERR "%s: GUARD check failed on sector %lu" \
1758                                " rcvd 0x%04x, data 0x%04x\n", __func__,
1759                                (unsigned long)sector,
1760                                be16_to_cpu(sdt[i].guard_tag),
1761                                be16_to_cpu(csum));
1762                         dif_errors++;
1763                         return 0x01;
1764                 }
1765
1766                 if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1767                     be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) {
1768                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1769                                __func__, (unsigned long)sector);
1770                         dif_errors++;
1771                         return 0x03;
1772                 }
1773
1774                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1775                     be32_to_cpu(sdt[i].ref_tag) != ei_lba) {
1776                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1777                                __func__, (unsigned long)sector);
1778                         dif_errors++;
1779                         return 0x03;
1780                 }
1781
1782                 ei_lba++;
1783         }
1784
1785         resid = sectors * 8; /* Bytes of protection data to copy into sgl */
1786         sector = start_sec;
1787
1788         scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
1789                 int len = min(psgl->length, resid);
1790
1791                 paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
1792                 memcpy(paddr, dif_storep + dif_offset(sector), len);
1793
1794                 sector += len >> 3;
1795                 if (sector >= sdebug_store_sectors) {
1796                         /* Force wrap */
1797                         tmp_sec = sector;
1798                         sector = do_div(tmp_sec, sdebug_store_sectors);
1799                 }
1800                 resid -= len;
1801                 kunmap_atomic(paddr);
1802         }
1803
1804         dix_reads++;
1805
1806         return 0;
1807 }
1808
1809 static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
1810                      unsigned int num, struct sdebug_dev_info *devip,
1811                      u32 ei_lba)
1812 {
1813         unsigned long iflags;
1814         int ret;
1815
1816         ret = check_device_access_params(devip, lba, num);
1817         if (ret)
1818                 return ret;
1819
1820         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
1821             (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) &&
1822             ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
1823                 /* claim unrecoverable read error */
1824                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0);
1825                 /* set info field and valid bit for fixed descriptor */
1826                 if (0x70 == (devip->sense_buff[0] & 0x7f)) {
1827                         devip->sense_buff[0] |= 0x80;   /* Valid bit */
1828                         ret = (lba < OPT_MEDIUM_ERR_ADDR)
1829                               ? OPT_MEDIUM_ERR_ADDR : (int)lba;
1830                         devip->sense_buff[3] = (ret >> 24) & 0xff;
1831                         devip->sense_buff[4] = (ret >> 16) & 0xff;
1832                         devip->sense_buff[5] = (ret >> 8) & 0xff;
1833                         devip->sense_buff[6] = ret & 0xff;
1834                 }
1835                 scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
1836                 return check_condition_result;
1837         }
1838
1839         /* DIX + T10 DIF */
1840         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
1841                 int prot_ret = prot_verify_read(SCpnt, lba, num, ei_lba);
1842
1843                 if (prot_ret) {
1844                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, prot_ret);
1845                         return illegal_condition_result;
1846                 }
1847         }
1848
1849         read_lock_irqsave(&atomic_rw, iflags);
1850         ret = do_device_access(SCpnt, devip, lba, num, 0);
1851         read_unlock_irqrestore(&atomic_rw, iflags);
1852         return ret;
1853 }
1854
1855 void dump_sector(unsigned char *buf, int len)
1856 {
1857         int i, j;
1858
1859         printk(KERN_ERR ">>> Sector Dump <<<\n");
1860
1861         for (i = 0 ; i < len ; i += 16) {
1862                 printk(KERN_ERR "%04d: ", i);
1863
1864                 for (j = 0 ; j < 16 ; j++) {
1865                         unsigned char c = buf[i+j];
1866                         if (c >= 0x20 && c < 0x7e)
1867                                 printk(" %c ", buf[i+j]);
1868                         else
1869                                 printk("%02x ", buf[i+j]);
1870                 }
1871
1872                 printk("\n");
1873         }
1874 }
1875
1876 static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
1877                              unsigned int sectors, u32 ei_lba)
1878 {
1879         int i, j, ret;
1880         struct sd_dif_tuple *sdt;
1881         struct scatterlist *dsgl = scsi_sglist(SCpnt);
1882         struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
1883         void *daddr, *paddr;
1884         sector_t tmp_sec = start_sec;
1885         sector_t sector;
1886         int ppage_offset;
1887         unsigned short csum;
1888
1889         sector = do_div(tmp_sec, sdebug_store_sectors);
1890
1891         BUG_ON(scsi_sg_count(SCpnt) == 0);
1892         BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
1893
1894         paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
1895         ppage_offset = 0;
1896
1897         /* For each data page */
1898         scsi_for_each_sg(SCpnt, dsgl, scsi_sg_count(SCpnt), i) {
1899                 daddr = kmap_atomic(sg_page(dsgl)) + dsgl->offset;
1900
1901                 /* For each sector-sized chunk in data page */
1902                 for (j = 0 ; j < dsgl->length ; j += scsi_debug_sector_size) {
1903
1904                         /* If we're at the end of the current
1905                          * protection page advance to the next one
1906                          */
1907                         if (ppage_offset >= psgl->length) {
1908                                 kunmap_atomic(paddr);
1909                                 psgl = sg_next(psgl);
1910                                 BUG_ON(psgl == NULL);
1911                                 paddr = kmap_atomic(sg_page(psgl))
1912                                         + psgl->offset;
1913                                 ppage_offset = 0;
1914                         }
1915
1916                         sdt = paddr + ppage_offset;
1917
1918                         switch (scsi_debug_guard) {
1919                         case 1:
1920                                 csum = ip_compute_csum(daddr,
1921                                                        scsi_debug_sector_size);
1922                                 break;
1923                         case 0:
1924                                 csum = cpu_to_be16(crc_t10dif(daddr,
1925                                                       scsi_debug_sector_size));
1926                                 break;
1927                         default:
1928                                 BUG();
1929                                 ret = 0;
1930                                 goto out;
1931                         }
1932
1933                         if (sdt->guard_tag != csum) {
1934                                 printk(KERN_ERR
1935                                        "%s: GUARD check failed on sector %lu " \
1936                                        "rcvd 0x%04x, calculated 0x%04x\n",
1937                                        __func__, (unsigned long)sector,
1938                                        be16_to_cpu(sdt->guard_tag),
1939                                        be16_to_cpu(csum));
1940                                 ret = 0x01;
1941                                 dump_sector(daddr, scsi_debug_sector_size);
1942                                 goto out;
1943                         }
1944
1945                         if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1946                             be32_to_cpu(sdt->ref_tag)
1947                             != (start_sec & 0xffffffff)) {
1948                                 printk(KERN_ERR
1949                                        "%s: REF check failed on sector %lu\n",
1950                                        __func__, (unsigned long)sector);
1951                                 ret = 0x03;
1952                                 dump_sector(daddr, scsi_debug_sector_size);
1953                                 goto out;
1954                         }
1955
1956                         if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1957                             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1958                                 printk(KERN_ERR
1959                                        "%s: REF check failed on sector %lu\n",
1960                                        __func__, (unsigned long)sector);
1961                                 ret = 0x03;
1962                                 dump_sector(daddr, scsi_debug_sector_size);
1963                                 goto out;
1964                         }
1965
1966                         /* Would be great to copy this in bigger
1967                          * chunks.  However, for the sake of
1968                          * correctness we need to verify each sector
1969                          * before writing it to "stable" storage
1970                          */
1971                         memcpy(dif_storep + dif_offset(sector), sdt, 8);
1972
1973                         sector++;
1974
1975                         if (sector == sdebug_store_sectors)
1976                                 sector = 0;     /* Force wrap */
1977
1978                         start_sec++;
1979                         ei_lba++;
1980                         daddr += scsi_debug_sector_size;
1981                         ppage_offset += sizeof(struct sd_dif_tuple);
1982                 }
1983
1984                 kunmap_atomic(daddr);
1985         }
1986
1987         kunmap_atomic(paddr);
1988
1989         dix_writes++;
1990
1991         return 0;
1992
1993 out:
1994         dif_errors++;
1995         kunmap_atomic(daddr);
1996         kunmap_atomic(paddr);
1997         return ret;
1998 }
1999
2000 static unsigned int map_state(sector_t lba, unsigned int *num)
2001 {
2002         unsigned int granularity, alignment, mapped;
2003         sector_t block, next, end;
2004
2005         granularity = scsi_debug_unmap_granularity;
2006         alignment = granularity - scsi_debug_unmap_alignment;
2007         block = lba + alignment;
2008         do_div(block, granularity);
2009
2010         mapped = test_bit(block, map_storep);
2011
2012         if (mapped)
2013                 next = find_next_zero_bit(map_storep, map_size, block);
2014         else
2015                 next = find_next_bit(map_storep, map_size, block);
2016
2017         end = next * granularity - scsi_debug_unmap_alignment;
2018         *num = end - lba;
2019
2020         return mapped;
2021 }
2022
2023 static void map_region(sector_t lba, unsigned int len)
2024 {
2025         unsigned int granularity, alignment;
2026         sector_t end = lba + len;
2027
2028         granularity = scsi_debug_unmap_granularity;
2029         alignment = granularity - scsi_debug_unmap_alignment;
2030
2031         while (lba < end) {
2032                 sector_t block, rem;
2033
2034                 block = lba + alignment;
2035                 rem = do_div(block, granularity);
2036
2037                 if (block < map_size)
2038                         set_bit(block, map_storep);
2039
2040                 lba += granularity - rem;
2041         }
2042 }
2043
2044 static void unmap_region(sector_t lba, unsigned int len)
2045 {
2046         unsigned int granularity, alignment;
2047         sector_t end = lba + len;
2048
2049         granularity = scsi_debug_unmap_granularity;
2050         alignment = granularity - scsi_debug_unmap_alignment;
2051
2052         while (lba < end) {
2053                 sector_t block, rem;
2054
2055                 block = lba + alignment;
2056                 rem = do_div(block, granularity);
2057
2058                 if (rem == 0 && lba + granularity < end && block < map_size) {
2059                         clear_bit(block, map_storep);
2060                         if (scsi_debug_lbprz)
2061                                 memset(fake_storep +
2062                                        block * scsi_debug_sector_size, 0,
2063                                        scsi_debug_sector_size);
2064                 }
2065                 lba += granularity - rem;
2066         }
2067 }
2068
2069 static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
2070                       unsigned int num, struct sdebug_dev_info *devip,
2071                       u32 ei_lba)
2072 {
2073         unsigned long iflags;
2074         int ret;
2075
2076         ret = check_device_access_params(devip, lba, num);
2077         if (ret)
2078                 return ret;
2079
2080         /* DIX + T10 DIF */
2081         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
2082                 int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
2083
2084                 if (prot_ret) {
2085                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
2086                         return illegal_condition_result;
2087                 }
2088         }
2089
2090         write_lock_irqsave(&atomic_rw, iflags);
2091         ret = do_device_access(SCpnt, devip, lba, num, 1);
2092         if (scsi_debug_unmap_granularity)
2093                 map_region(lba, num);
2094         write_unlock_irqrestore(&atomic_rw, iflags);
2095         if (-1 == ret)
2096                 return (DID_ERROR << 16);
2097         else if ((ret < (num * scsi_debug_sector_size)) &&
2098                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2099                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
2100                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2101
2102         return 0;
2103 }
2104
2105 static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
2106                       unsigned int num, struct sdebug_dev_info *devip,
2107                            u32 ei_lba, unsigned int unmap)
2108 {
2109         unsigned long iflags;
2110         unsigned long long i;
2111         int ret;
2112
2113         ret = check_device_access_params(devip, lba, num);
2114         if (ret)
2115                 return ret;
2116
2117         if (num > scsi_debug_write_same_length) {
2118                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2119                                 0);
2120                 return check_condition_result;
2121         }
2122
2123         write_lock_irqsave(&atomic_rw, iflags);
2124
2125         if (unmap && scsi_debug_unmap_granularity) {
2126                 unmap_region(lba, num);
2127                 goto out;
2128         }
2129
2130         /* Else fetch one logical block */
2131         ret = fetch_to_dev_buffer(scmd,
2132                                   fake_storep + (lba * scsi_debug_sector_size),
2133                                   scsi_debug_sector_size);
2134
2135         if (-1 == ret) {
2136                 write_unlock_irqrestore(&atomic_rw, iflags);
2137                 return (DID_ERROR << 16);
2138         } else if ((ret < (num * scsi_debug_sector_size)) &&
2139                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2140                 printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
2141                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2142
2143         /* Copy first sector to remaining blocks */
2144         for (i = 1 ; i < num ; i++)
2145                 memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
2146                        fake_storep + (lba * scsi_debug_sector_size),
2147                        scsi_debug_sector_size);
2148
2149         if (scsi_debug_unmap_granularity)
2150                 map_region(lba, num);
2151 out:
2152         write_unlock_irqrestore(&atomic_rw, iflags);
2153
2154         return 0;
2155 }
2156
2157 struct unmap_block_desc {
2158         __be64  lba;
2159         __be32  blocks;
2160         __be32  __reserved;
2161 };
2162
2163 static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
2164 {
2165         unsigned char *buf;
2166         struct unmap_block_desc *desc;
2167         unsigned int i, payload_len, descriptors;
2168         int ret;
2169
2170         ret = check_readiness(scmd, 1, devip);
2171         if (ret)
2172                 return ret;
2173
2174         payload_len = get_unaligned_be16(&scmd->cmnd[7]);
2175         BUG_ON(scsi_bufflen(scmd) != payload_len);
2176
2177         descriptors = (payload_len - 8) / 16;
2178
2179         buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
2180         if (!buf)
2181                 return check_condition_result;
2182
2183         scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
2184
2185         BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
2186         BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
2187
2188         desc = (void *)&buf[8];
2189
2190         for (i = 0 ; i < descriptors ; i++) {
2191                 unsigned long long lba = get_unaligned_be64(&desc[i].lba);
2192                 unsigned int num = get_unaligned_be32(&desc[i].blocks);
2193
2194                 ret = check_device_access_params(devip, lba, num);
2195                 if (ret)
2196                         goto out;
2197
2198                 unmap_region(lba, num);
2199         }
2200
2201         ret = 0;
2202
2203 out:
2204         kfree(buf);
2205
2206         return ret;
2207 }
2208
2209 #define SDEBUG_GET_LBA_STATUS_LEN 32
2210
2211 static int resp_get_lba_status(struct scsi_cmnd * scmd,
2212                                struct sdebug_dev_info * devip)
2213 {
2214         unsigned long long lba;
2215         unsigned int alloc_len, mapped, num;
2216         unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
2217         int ret;
2218
2219         ret = check_readiness(scmd, 1, devip);
2220         if (ret)
2221                 return ret;
2222
2223         lba = get_unaligned_be64(&scmd->cmnd[2]);
2224         alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
2225
2226         if (alloc_len < 24)
2227                 return 0;
2228
2229         ret = check_device_access_params(devip, lba, 1);
2230         if (ret)
2231                 return ret;
2232
2233         mapped = map_state(lba, &num);
2234
2235         memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
2236         put_unaligned_be32(20, &arr[0]);        /* Parameter Data Length */
2237         put_unaligned_be64(lba, &arr[8]);       /* LBA */
2238         put_unaligned_be32(num, &arr[16]);      /* Number of blocks */
2239         arr[20] = !mapped;                      /* mapped = 0, unmapped = 1 */
2240
2241         return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
2242 }
2243
2244 #define SDEBUG_RLUN_ARR_SZ 256
2245
2246 static int resp_report_luns(struct scsi_cmnd * scp,
2247                             struct sdebug_dev_info * devip)
2248 {
2249         unsigned int alloc_len;
2250         int lun_cnt, i, upper, num, n, wlun, lun;
2251         unsigned char *cmd = (unsigned char *)scp->cmnd;
2252         int select_report = (int)cmd[2];
2253         struct scsi_lun *one_lun;
2254         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
2255         unsigned char * max_addr;
2256
2257         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
2258         if ((alloc_len < 4) || (select_report > 2)) {
2259                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2260                                 0);
2261                 return check_condition_result;
2262         }
2263         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
2264         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
2265         lun_cnt = scsi_debug_max_luns;
2266         if (1 == select_report)
2267                 lun_cnt = 0;
2268         else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
2269                 --lun_cnt;
2270         wlun = (select_report > 0) ? 1 : 0;
2271         num = lun_cnt + wlun;
2272         arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
2273         arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
2274         n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
2275                             sizeof(struct scsi_lun)), num);
2276         if (n < num) {
2277                 wlun = 0;
2278                 lun_cnt = n;
2279         }
2280         one_lun = (struct scsi_lun *) &arr[8];
2281         max_addr = arr + SDEBUG_RLUN_ARR_SZ;
2282         for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
2283              ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
2284              i++, lun++) {
2285                 upper = (lun >> 8) & 0x3f;
2286                 if (upper)
2287                         one_lun[i].scsi_lun[0] =
2288                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
2289                 one_lun[i].scsi_lun[1] = lun & 0xff;
2290         }
2291         if (wlun) {
2292                 one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
2293                 one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
2294                 i++;
2295         }
2296         alloc_len = (unsigned char *)(one_lun + i) - arr;
2297         return fill_from_dev_buffer(scp, arr,
2298                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
2299 }
2300
2301 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
2302                             unsigned int num, struct sdebug_dev_info *devip)
2303 {
2304         int i, j, ret = -1;
2305         unsigned char *kaddr, *buf;
2306         unsigned int offset;
2307         struct scatterlist *sg;
2308         struct scsi_data_buffer *sdb = scsi_in(scp);
2309
2310         /* better not to use temporary buffer. */
2311         buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
2312         if (!buf)
2313                 return ret;
2314
2315         scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
2316
2317         offset = 0;
2318         for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
2319                 kaddr = (unsigned char *)kmap_atomic(sg_page(sg));
2320                 if (!kaddr)
2321                         goto out;
2322
2323                 for (j = 0; j < sg->length; j++)
2324                         *(kaddr + sg->offset + j) ^= *(buf + offset + j);
2325
2326                 offset += sg->length;
2327                 kunmap_atomic(kaddr);
2328         }
2329         ret = 0;
2330 out:
2331         kfree(buf);
2332
2333         return ret;
2334 }
2335
2336 /* When timer goes off this function is called. */
2337 static void timer_intr_handler(unsigned long indx)
2338 {
2339         struct sdebug_queued_cmd * sqcp;
2340         unsigned long iflags;
2341
2342         if (indx >= scsi_debug_max_queue) {
2343                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
2344                        "large\n");
2345                 return;
2346         }
2347         spin_lock_irqsave(&queued_arr_lock, iflags);
2348         sqcp = &queued_arr[(int)indx];
2349         if (! sqcp->in_use) {
2350                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
2351                        "interrupt\n");
2352                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2353                 return;
2354         }
2355         sqcp->in_use = 0;
2356         if (sqcp->done_funct) {
2357                 sqcp->a_cmnd->result = sqcp->scsi_result;
2358                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
2359         }
2360         sqcp->done_funct = NULL;
2361         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2362 }
2363
2364
2365 static struct sdebug_dev_info *
2366 sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
2367 {
2368         struct sdebug_dev_info *devip;
2369
2370         devip = kzalloc(sizeof(*devip), flags);
2371         if (devip) {
2372                 devip->sdbg_host = sdbg_host;
2373                 list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
2374         }
2375         return devip;
2376 }
2377
2378 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
2379 {
2380         struct sdebug_host_info * sdbg_host;
2381         struct sdebug_dev_info * open_devip = NULL;
2382         struct sdebug_dev_info * devip =
2383                         (struct sdebug_dev_info *)sdev->hostdata;
2384
2385         if (devip)
2386                 return devip;
2387         sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
2388         if (!sdbg_host) {
2389                 printk(KERN_ERR "Host info NULL\n");
2390                 return NULL;
2391         }
2392         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
2393                 if ((devip->used) && (devip->channel == sdev->channel) &&
2394                     (devip->target == sdev->id) &&
2395                     (devip->lun == sdev->lun))
2396                         return devip;
2397                 else {
2398                         if ((!devip->used) && (!open_devip))
2399                                 open_devip = devip;
2400                 }
2401         }
2402         if (!open_devip) { /* try and make a new one */
2403                 open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
2404                 if (!open_devip) {
2405                         printk(KERN_ERR "%s: out of memory at line %d\n",
2406                                 __func__, __LINE__);
2407                         return NULL;
2408                 }
2409         }
2410
2411         open_devip->channel = sdev->channel;
2412         open_devip->target = sdev->id;
2413         open_devip->lun = sdev->lun;
2414         open_devip->sdbg_host = sdbg_host;
2415         open_devip->reset = 1;
2416         open_devip->used = 1;
2417         memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
2418         if (scsi_debug_dsense)
2419                 open_devip->sense_buff[0] = 0x72;
2420         else {
2421                 open_devip->sense_buff[0] = 0x70;
2422                 open_devip->sense_buff[7] = 0xa;
2423         }
2424         if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
2425                 open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
2426
2427         return open_devip;
2428 }
2429
2430 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
2431 {
2432         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2433                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
2434                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2435         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
2436         return 0;
2437 }
2438
2439 static int scsi_debug_slave_configure(struct scsi_device *sdp)
2440 {
2441         struct sdebug_dev_info *devip;
2442
2443         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2444                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
2445                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2446         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
2447                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
2448         devip = devInfoReg(sdp);
2449         if (NULL == devip)
2450                 return 1;       /* no resources, will be marked offline */
2451         sdp->hostdata = devip;
2452         if (sdp->host->cmd_per_lun)
2453                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
2454                                         sdp->host->cmd_per_lun);
2455         blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
2456         if (scsi_debug_no_uld)
2457                 sdp->no_uld_attach = 1;
2458         return 0;
2459 }
2460
2461 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
2462 {
2463         struct sdebug_dev_info *devip =
2464                 (struct sdebug_dev_info *)sdp->hostdata;
2465
2466         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2467                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
2468                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2469         if (devip) {
2470                 /* make this slot available for re-use */
2471                 devip->used = 0;
2472                 sdp->hostdata = NULL;
2473         }
2474 }
2475
2476 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
2477 static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
2478 {
2479         unsigned long iflags;
2480         int k;
2481         struct sdebug_queued_cmd *sqcp;
2482
2483         spin_lock_irqsave(&queued_arr_lock, iflags);
2484         for (k = 0; k < scsi_debug_max_queue; ++k) {
2485                 sqcp = &queued_arr[k];
2486                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
2487                         del_timer_sync(&sqcp->cmnd_timer);
2488                         sqcp->in_use = 0;
2489                         sqcp->a_cmnd = NULL;
2490                         break;
2491                 }
2492         }
2493         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2494         return (k < scsi_debug_max_queue) ? 1 : 0;
2495 }
2496
2497 /* Deletes (stops) timers of all queued commands */
2498 static void stop_all_queued(void)
2499 {
2500         unsigned long iflags;
2501         int k;
2502         struct sdebug_queued_cmd *sqcp;
2503
2504         spin_lock_irqsave(&queued_arr_lock, iflags);
2505         for (k = 0; k < scsi_debug_max_queue; ++k) {
2506                 sqcp = &queued_arr[k];
2507                 if (sqcp->in_use && sqcp->a_cmnd) {
2508                         del_timer_sync(&sqcp->cmnd_timer);
2509                         sqcp->in_use = 0;
2510                         sqcp->a_cmnd = NULL;
2511                 }
2512         }
2513         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2514 }
2515
2516 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
2517 {
2518         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2519                 printk(KERN_INFO "scsi_debug: abort\n");
2520         ++num_aborts;
2521         stop_queued_cmnd(SCpnt);
2522         return SUCCESS;
2523 }
2524
2525 static int scsi_debug_biosparam(struct scsi_device *sdev,
2526                 struct block_device * bdev, sector_t capacity, int *info)
2527 {
2528         int res;
2529         unsigned char *buf;
2530
2531         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2532                 printk(KERN_INFO "scsi_debug: biosparam\n");
2533         buf = scsi_bios_ptable(bdev);
2534         if (buf) {
2535                 res = scsi_partsize(buf, capacity,
2536                                     &info[2], &info[0], &info[1]);
2537                 kfree(buf);
2538                 if (! res)
2539                         return res;
2540         }
2541         info[0] = sdebug_heads;
2542         info[1] = sdebug_sectors_per;
2543         info[2] = sdebug_cylinders_per;
2544         return 0;
2545 }
2546
2547 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
2548 {
2549         struct sdebug_dev_info * devip;
2550
2551         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2552                 printk(KERN_INFO "scsi_debug: device_reset\n");
2553         ++num_dev_resets;
2554         if (SCpnt) {
2555                 devip = devInfoReg(SCpnt->device);
2556                 if (devip)
2557                         devip->reset = 1;
2558         }
2559         return SUCCESS;
2560 }
2561
2562 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
2563 {
2564         struct sdebug_host_info *sdbg_host;
2565         struct sdebug_dev_info * dev_info;
2566         struct scsi_device * sdp;
2567         struct Scsi_Host * hp;
2568
2569         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2570                 printk(KERN_INFO "scsi_debug: bus_reset\n");
2571         ++num_bus_resets;
2572         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
2573                 sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
2574                 if (sdbg_host) {
2575                         list_for_each_entry(dev_info,
2576                                             &sdbg_host->dev_info_list,
2577                                             dev_list)
2578                                 dev_info->reset = 1;
2579                 }
2580         }
2581         return SUCCESS;
2582 }
2583
2584 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
2585 {
2586         struct sdebug_host_info * sdbg_host;
2587         struct sdebug_dev_info * dev_info;
2588
2589         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2590                 printk(KERN_INFO "scsi_debug: host_reset\n");
2591         ++num_host_resets;
2592         spin_lock(&sdebug_host_list_lock);
2593         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
2594                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
2595                                     dev_list)
2596                         dev_info->reset = 1;
2597         }
2598         spin_unlock(&sdebug_host_list_lock);
2599         stop_all_queued();
2600         return SUCCESS;
2601 }
2602
2603 /* Initializes timers in queued array */
2604 static void __init init_all_queued(void)
2605 {
2606         unsigned long iflags;
2607         int k;
2608         struct sdebug_queued_cmd * sqcp;
2609
2610         spin_lock_irqsave(&queued_arr_lock, iflags);
2611         for (k = 0; k < scsi_debug_max_queue; ++k) {
2612                 sqcp = &queued_arr[k];
2613                 init_timer(&sqcp->cmnd_timer);
2614                 sqcp->in_use = 0;
2615                 sqcp->a_cmnd = NULL;
2616         }
2617         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2618 }
2619
2620 static void __init sdebug_build_parts(unsigned char *ramp,
2621                                       unsigned long store_size)
2622 {
2623         struct partition * pp;
2624         int starts[SDEBUG_MAX_PARTS + 2];
2625         int sectors_per_part, num_sectors, k;
2626         int heads_by_sects, start_sec, end_sec;
2627
2628         /* assume partition table already zeroed */
2629         if ((scsi_debug_num_parts < 1) || (store_size < 1048576))
2630                 return;
2631         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
2632                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
2633                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
2634                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
2635         }
2636         num_sectors = (int)sdebug_store_sectors;
2637         sectors_per_part = (num_sectors - sdebug_sectors_per)
2638                            / scsi_debug_num_parts;
2639         heads_by_sects = sdebug_heads * sdebug_sectors_per;
2640         starts[0] = sdebug_sectors_per;
2641         for (k = 1; k < scsi_debug_num_parts; ++k)
2642                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
2643                             * heads_by_sects;
2644         starts[scsi_debug_num_parts] = num_sectors;
2645         starts[scsi_debug_num_parts + 1] = 0;
2646
2647         ramp[510] = 0x55;       /* magic partition markings */
2648         ramp[511] = 0xAA;
2649         pp = (struct partition *)(ramp + 0x1be);
2650         for (k = 0; starts[k + 1]; ++k, ++pp) {
2651                 start_sec = starts[k];
2652                 end_sec = starts[k + 1] - 1;
2653                 pp->boot_ind = 0;
2654
2655                 pp->cyl = start_sec / heads_by_sects;
2656                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
2657                            / sdebug_sectors_per;
2658                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
2659
2660                 pp->end_cyl = end_sec / heads_by_sects;
2661                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
2662                                / sdebug_sectors_per;
2663                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
2664
2665                 pp->start_sect = start_sec;
2666                 pp->nr_sects = end_sec - start_sec + 1;
2667                 pp->sys_ind = 0x83;     /* plain Linux partition */
2668         }
2669 }
2670
2671 static int schedule_resp(struct scsi_cmnd * cmnd,
2672                          struct sdebug_dev_info * devip,
2673                          done_funct_t done, int scsi_result, int delta_jiff)
2674 {
2675         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
2676                 if (scsi_result) {
2677                         struct scsi_device * sdp = cmnd->device;
2678
2679                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
2680                                "non-zero result=0x%x\n", sdp->host->host_no,
2681                                sdp->channel, sdp->id, sdp->lun, scsi_result);
2682                 }
2683         }
2684         if (cmnd && devip) {
2685                 /* simulate autosense by this driver */
2686                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
2687                         memcpy(cmnd->sense_buffer, devip->sense_buff,
2688                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
2689                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
2690         }
2691         if (delta_jiff <= 0) {
2692                 if (cmnd)
2693                         cmnd->result = scsi_result;
2694                 if (done)
2695                         done(cmnd);
2696                 return 0;
2697         } else {
2698                 unsigned long iflags;
2699                 int k;
2700                 struct sdebug_queued_cmd * sqcp = NULL;
2701
2702                 spin_lock_irqsave(&queued_arr_lock, iflags);
2703                 for (k = 0; k < scsi_debug_max_queue; ++k) {
2704                         sqcp = &queued_arr[k];
2705                         if (! sqcp->in_use)
2706                                 break;
2707                 }
2708                 if (k >= scsi_debug_max_queue) {
2709                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2710                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
2711                         return 1;       /* report busy to mid level */
2712                 }
2713                 sqcp->in_use = 1;
2714                 sqcp->a_cmnd = cmnd;
2715                 sqcp->scsi_result = scsi_result;
2716                 sqcp->done_funct = done;
2717                 sqcp->cmnd_timer.function = timer_intr_handler;
2718                 sqcp->cmnd_timer.data = k;
2719                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
2720                 add_timer(&sqcp->cmnd_timer);
2721                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2722                 if (cmnd)
2723                         cmnd->result = 0;
2724                 return 0;
2725         }
2726 }
2727 /* Note: The following macros create attribute files in the
2728    /sys/module/scsi_debug/parameters directory. Unfortunately this
2729    driver is unaware of a change and cannot trigger auxiliary actions
2730    as it can when the corresponding attribute in the
2731    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
2732  */
2733 module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
2734 module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
2735 module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
2736 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
2737 module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
2738 module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
2739 module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
2740 module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
2741 module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
2742 module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
2743 module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
2744 module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
2745 module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
2746 module_param_named(lbprz, scsi_debug_lbprz, int, S_IRUGO);
2747 module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
2748 module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
2749 module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
2750 module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
2751 module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
2752 module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
2753 module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
2754 module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
2755 module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
2756 module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
2757 module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
2758 module_param_named(removable, scsi_debug_removable, bool, S_IRUGO | S_IWUSR);
2759 module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
2760 module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
2761 module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
2762 module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
2763 module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
2764 module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
2765 module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
2766 module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
2767                    S_IRUGO | S_IWUSR);
2768 module_param_named(write_same_length, scsi_debug_write_same_length, int,
2769                    S_IRUGO | S_IWUSR);
2770
2771 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
2772 MODULE_DESCRIPTION("SCSI debug adapter driver");
2773 MODULE_LICENSE("GPL");
2774 MODULE_VERSION(SCSI_DEBUG_VERSION);
2775
2776 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
2777 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
2778 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
2779 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)");
2780 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
2781 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
2782 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
2783 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
2784 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
2785 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
2786 MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
2787 MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
2788 MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
2789 MODULE_PARM_DESC(lbprz, "unmapped blocks return 0 on read (def=1)");
2790 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
2791 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
2792 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
2793 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
2794 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
2795 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
2796 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
2797 MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
2798 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
2799 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
2800 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
2801 MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
2802 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
2803 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
2804 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
2805 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
2806 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
2807 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
2808 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
2809 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
2810 MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
2811
2812 static char sdebug_info[256];
2813
2814 static const char * scsi_debug_info(struct Scsi_Host * shp)
2815 {
2816         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
2817                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
2818                 scsi_debug_version_date, scsi_debug_dev_size_mb,
2819                 scsi_debug_opts);
2820         return sdebug_info;
2821 }
2822
2823 /* scsi_debug_proc_info
2824  * Used if the driver currently has no own support for /proc/scsi
2825  */
2826 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
2827                                 int length, int inout)
2828 {
2829         int len, pos, begin;
2830         int orig_length;
2831
2832         orig_length = length;
2833
2834         if (inout == 1) {
2835                 char arr[16];
2836                 int minLen = length > 15 ? 15 : length;
2837
2838                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2839                         return -EACCES;
2840                 memcpy(arr, buffer, minLen);
2841                 arr[minLen] = '\0';
2842                 if (1 != sscanf(arr, "%d", &pos))
2843                         return -EINVAL;
2844                 scsi_debug_opts = pos;
2845                 if (scsi_debug_every_nth != 0)
2846                         scsi_debug_cmnd_count = 0;
2847                 return length;
2848         }
2849         begin = 0;
2850         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
2851             "%s [%s]\n"
2852             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
2853             "every_nth=%d(curr:%d)\n"
2854             "delay=%d, max_luns=%d, scsi_level=%d\n"
2855             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
2856             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
2857             "host_resets=%d\ndix_reads=%d dix_writes=%d dif_errors=%d\n",
2858             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
2859             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
2860             scsi_debug_cmnd_count, scsi_debug_delay,
2861             scsi_debug_max_luns, scsi_debug_scsi_level,
2862             scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
2863             sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
2864             num_host_resets, dix_reads, dix_writes, dif_errors);
2865         if (pos < offset) {
2866                 len = 0;
2867                 begin = pos;
2868         }
2869         *start = buffer + (offset - begin);     /* Start of wanted data */
2870         len -= (offset - begin);
2871         if (len > length)
2872                 len = length;
2873         return len;
2874 }
2875
2876 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
2877 {
2878         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
2879 }
2880
2881 static ssize_t sdebug_delay_store(struct device_driver * ddp,
2882                                   const char * buf, size_t count)
2883 {
2884         int delay;
2885         char work[20];
2886
2887         if (1 == sscanf(buf, "%10s", work)) {
2888                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
2889                         scsi_debug_delay = delay;
2890                         return count;
2891                 }
2892         }
2893         return -EINVAL;
2894 }
2895 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
2896             sdebug_delay_store);
2897
2898 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
2899 {
2900         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
2901 }
2902
2903 static ssize_t sdebug_opts_store(struct device_driver * ddp,
2904                                  const char * buf, size_t count)
2905 {
2906         int opts;
2907         char work[20];
2908
2909         if (1 == sscanf(buf, "%10s", work)) {
2910                 if (0 == strnicmp(work,"0x", 2)) {
2911                         if (1 == sscanf(&work[2], "%x", &opts))
2912                                 goto opts_done;
2913                 } else {
2914                         if (1 == sscanf(work, "%d", &opts))
2915                                 goto opts_done;
2916                 }
2917         }
2918         return -EINVAL;
2919 opts_done:
2920         scsi_debug_opts = opts;
2921         scsi_debug_cmnd_count = 0;
2922         return count;
2923 }
2924 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
2925             sdebug_opts_store);
2926
2927 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
2928 {
2929         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
2930 }
2931 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
2932                                   const char * buf, size_t count)
2933 {
2934         int n;
2935
2936         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2937                 scsi_debug_ptype = n;
2938                 return count;
2939         }
2940         return -EINVAL;
2941 }
2942 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
2943
2944 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
2945 {
2946         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
2947 }
2948 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
2949                                   const char * buf, size_t count)
2950 {
2951         int n;
2952
2953         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2954                 scsi_debug_dsense = n;
2955                 return count;
2956         }
2957         return -EINVAL;
2958 }
2959 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
2960             sdebug_dsense_store);
2961
2962 static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)
2963 {
2964         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
2965 }
2966 static ssize_t sdebug_fake_rw_store(struct device_driver * ddp,
2967                                     const char * buf, size_t count)
2968 {
2969         int n;
2970
2971         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2972                 scsi_debug_fake_rw = n;
2973                 return count;
2974         }
2975         return -EINVAL;
2976 }
2977 DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
2978             sdebug_fake_rw_store);
2979
2980 static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
2981 {
2982         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
2983 }
2984 static ssize_t sdebug_no_lun_0_store(struct device_driver * ddp,
2985                                      const char * buf, size_t count)
2986 {
2987         int n;
2988
2989         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2990                 scsi_debug_no_lun_0 = n;
2991                 return count;
2992         }
2993         return -EINVAL;
2994 }
2995 DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
2996             sdebug_no_lun_0_store);
2997
2998 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
2999 {
3000         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
3001 }
3002 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
3003                                      const char * buf, size_t count)
3004 {
3005         int n;
3006
3007         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3008                 scsi_debug_num_tgts = n;
3009                 sdebug_max_tgts_luns();
3010                 return count;
3011         }
3012         return -EINVAL;
3013 }
3014 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
3015             sdebug_num_tgts_store);
3016
3017 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
3018 {
3019         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
3020 }
3021 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
3022
3023 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
3024 {
3025         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
3026 }
3027 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
3028
3029 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
3030 {
3031         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
3032 }
3033 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
3034                                       const char * buf, size_t count)
3035 {
3036         int nth;
3037
3038         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
3039                 scsi_debug_every_nth = nth;
3040                 scsi_debug_cmnd_count = 0;
3041                 return count;
3042         }
3043         return -EINVAL;
3044 }
3045 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
3046             sdebug_every_nth_store);
3047
3048 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
3049 {
3050         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
3051 }
3052 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
3053                                      const char * buf, size_t count)
3054 {
3055         int n;
3056
3057         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3058                 scsi_debug_max_luns = n;
3059                 sdebug_max_tgts_luns();
3060                 return count;
3061         }
3062         return -EINVAL;
3063 }
3064 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
3065             sdebug_max_luns_store);
3066
3067 static ssize_t sdebug_max_queue_show(struct device_driver * ddp, char * buf)
3068 {
3069         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
3070 }
3071 static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
3072                                       const char * buf, size_t count)
3073 {
3074         int n;
3075
3076         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
3077             (n <= SCSI_DEBUG_CANQUEUE)) {
3078                 scsi_debug_max_queue = n;
3079                 return count;
3080         }
3081         return -EINVAL;
3082 }
3083 DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
3084             sdebug_max_queue_store);
3085
3086 static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
3087 {
3088         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
3089 }
3090 DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
3091
3092 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
3093 {
3094         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
3095 }
3096 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
3097
3098 static ssize_t sdebug_virtual_gb_show(struct device_driver * ddp, char * buf)
3099 {
3100         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
3101 }
3102 static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
3103                                        const char * buf, size_t count)
3104 {
3105         int n;
3106
3107         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3108                 scsi_debug_virtual_gb = n;
3109
3110                 sdebug_capacity = get_sdebug_capacity();
3111
3112                 return count;
3113         }
3114         return -EINVAL;
3115 }
3116 DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
3117             sdebug_virtual_gb_store);
3118
3119 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
3120 {
3121         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
3122 }
3123
3124 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
3125                                      const char * buf, size_t count)
3126 {
3127         int delta_hosts;
3128
3129         if (sscanf(buf, "%d", &delta_hosts) != 1)
3130                 return -EINVAL;
3131         if (delta_hosts > 0) {
3132                 do {
3133                         sdebug_add_adapter();
3134                 } while (--delta_hosts);
3135         } else if (delta_hosts < 0) {
3136                 do {
3137                         sdebug_remove_adapter();
3138                 } while (++delta_hosts);
3139         }
3140         return count;
3141 }
3142 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
3143             sdebug_add_host_store);
3144
3145 static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
3146                                           char * buf)
3147 {
3148         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
3149 }
3150 static ssize_t sdebug_vpd_use_hostno_store(struct device_driver * ddp,
3151                                            const char * buf, size_t count)
3152 {
3153         int n;
3154
3155         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3156                 scsi_debug_vpd_use_hostno = n;
3157                 return count;
3158         }
3159         return -EINVAL;
3160 }
3161 DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
3162             sdebug_vpd_use_hostno_store);
3163
3164 static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
3165 {
3166         return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
3167 }
3168 DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
3169
3170 static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
3171 {
3172         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
3173 }
3174 DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
3175
3176 static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
3177 {
3178         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
3179 }
3180 DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
3181
3182 static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
3183 {
3184         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
3185 }
3186 DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
3187
3188 static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
3189 {
3190         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
3191 }
3192 DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
3193
3194 static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
3195 {
3196         ssize_t count;
3197
3198         if (!scsi_debug_lbp())
3199                 return scnprintf(buf, PAGE_SIZE, "0-%u\n",
3200                                  sdebug_store_sectors);
3201
3202         count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
3203
3204         buf[count++] = '\n';
3205         buf[count++] = 0;
3206
3207         return count;
3208 }
3209 DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
3210
3211 static ssize_t sdebug_removable_show(struct device_driver *ddp,
3212                                      char *buf)
3213 {
3214         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_removable ? 1 : 0);
3215 }
3216 static ssize_t sdebug_removable_store(struct device_driver *ddp,
3217                                       const char *buf, size_t count)
3218 {
3219         int n;
3220
3221         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3222                 scsi_debug_removable = (n > 0);
3223                 return count;
3224         }
3225         return -EINVAL;
3226 }
3227 DRIVER_ATTR(removable, S_IRUGO | S_IWUSR, sdebug_removable_show,
3228             sdebug_removable_store);
3229
3230
3231 /* Note: The following function creates attribute files in the
3232    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
3233    files (over those found in the /sys/module/scsi_debug/parameters
3234    directory) is that auxiliary actions can be triggered when an attribute
3235    is changed. For example see: sdebug_add_host_store() above.
3236  */
3237 static int do_create_driverfs_files(void)
3238 {
3239         int ret;
3240
3241         ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3242         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
3243         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3244         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3245         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3246         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3247         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3248         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3249         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3250         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3251         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3252         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3253         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3254         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
3255         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_removable);
3256         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3257         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3258         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3259         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3260         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
3261         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
3262         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
3263         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
3264         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
3265         return ret;
3266 }
3267
3268 static void do_remove_driverfs_files(void)
3269 {
3270         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
3271         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
3272         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
3273         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
3274         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
3275         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3276         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3277         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3278         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3279         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
3280         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3281         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_removable);
3282         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3283         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3284         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3285         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3286         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3287         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3288         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3289         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3290         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3291         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3292         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
3293         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3294 }
3295
3296 struct device *pseudo_primary;
3297
3298 static int __init scsi_debug_init(void)
3299 {
3300         unsigned long sz;
3301         int host_to_add;
3302         int k;
3303         int ret;
3304
3305         switch (scsi_debug_sector_size) {
3306         case  512:
3307         case 1024:
3308         case 2048:
3309         case 4096:
3310                 break;
3311         default:
3312                 printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
3313                        scsi_debug_sector_size);
3314                 return -EINVAL;
3315         }
3316
3317         switch (scsi_debug_dif) {
3318
3319         case SD_DIF_TYPE0_PROTECTION:
3320         case SD_DIF_TYPE1_PROTECTION:
3321         case SD_DIF_TYPE2_PROTECTION:
3322         case SD_DIF_TYPE3_PROTECTION:
3323                 break;
3324
3325         default:
3326                 printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
3327                 return -EINVAL;
3328         }
3329
3330         if (scsi_debug_guard > 1) {
3331                 printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
3332                 return -EINVAL;
3333         }
3334
3335         if (scsi_debug_ato > 1) {
3336                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
3337                 return -EINVAL;
3338         }
3339
3340         if (scsi_debug_physblk_exp > 15) {
3341                 printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
3342                        scsi_debug_physblk_exp);
3343                 return -EINVAL;
3344         }
3345
3346         if (scsi_debug_lowest_aligned > 0x3fff) {
3347                 printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
3348                        scsi_debug_lowest_aligned);
3349                 return -EINVAL;
3350         }
3351
3352         if (scsi_debug_dev_size_mb < 1)
3353                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
3354         sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
3355         sdebug_store_sectors = sz / scsi_debug_sector_size;
3356         sdebug_capacity = get_sdebug_capacity();
3357
3358         /* play around with geometry, don't waste too much on track 0 */
3359         sdebug_heads = 8;
3360         sdebug_sectors_per = 32;
3361         if (scsi_debug_dev_size_mb >= 16)
3362                 sdebug_heads = 32;
3363         else if (scsi_debug_dev_size_mb >= 256)
3364                 sdebug_heads = 64;
3365         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3366                                (sdebug_sectors_per * sdebug_heads);
3367         if (sdebug_cylinders_per >= 1024) {
3368                 /* other LLDs do this; implies >= 1GB ram disk ... */
3369                 sdebug_heads = 255;
3370                 sdebug_sectors_per = 63;
3371                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3372                                (sdebug_sectors_per * sdebug_heads);
3373         }
3374
3375         fake_storep = vmalloc(sz);
3376         if (NULL == fake_storep) {
3377                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
3378                 return -ENOMEM;
3379         }
3380         memset(fake_storep, 0, sz);
3381         if (scsi_debug_num_parts > 0)
3382                 sdebug_build_parts(fake_storep, sz);
3383
3384         if (scsi_debug_dif) {
3385                 int dif_size;
3386
3387                 dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
3388                 dif_storep = vmalloc(dif_size);
3389
3390                 printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
3391                        dif_size, dif_storep);
3392
3393                 if (dif_storep == NULL) {
3394                         printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
3395                         ret = -ENOMEM;
3396                         goto free_vm;
3397                 }
3398
3399                 memset(dif_storep, 0xff, dif_size);
3400         }
3401
3402         /* Logical Block Provisioning */
3403         if (scsi_debug_lbp()) {
3404                 unsigned int map_bytes;
3405
3406                 scsi_debug_unmap_max_blocks =
3407                         clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
3408
3409                 scsi_debug_unmap_max_desc =
3410                         clamp(scsi_debug_unmap_max_desc, 0U, 256U);
3411
3412                 scsi_debug_unmap_granularity =
3413                         clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
3414
3415                 if (scsi_debug_unmap_alignment &&
3416                     scsi_debug_unmap_granularity < scsi_debug_unmap_alignment) {
3417                         printk(KERN_ERR
3418                                "%s: ERR: unmap_granularity < unmap_alignment\n",
3419                                __func__);
3420                         return -EINVAL;
3421                 }
3422
3423                 map_size = (sdebug_store_sectors / scsi_debug_unmap_granularity);
3424                 map_bytes = map_size >> 3;
3425                 map_storep = vmalloc(map_bytes);
3426
3427                 printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
3428                        map_size);
3429
3430                 if (map_storep == NULL) {
3431                         printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
3432                         ret = -ENOMEM;
3433                         goto free_vm;
3434                 }
3435
3436                 memset(map_storep, 0x0, map_bytes);
3437
3438                 /* Map first 1KB for partition table */
3439                 if (scsi_debug_num_parts)
3440                         map_region(0, 2);
3441         }
3442
3443         pseudo_primary = root_device_register("pseudo_0");
3444         if (IS_ERR(pseudo_primary)) {
3445                 printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
3446                 ret = PTR_ERR(pseudo_primary);
3447                 goto free_vm;
3448         }
3449         ret = bus_register(&pseudo_lld_bus);
3450         if (ret < 0) {
3451                 printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
3452                         ret);
3453                 goto dev_unreg;
3454         }
3455         ret = driver_register(&sdebug_driverfs_driver);
3456         if (ret < 0) {
3457                 printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
3458                         ret);
3459                 goto bus_unreg;
3460         }
3461         ret = do_create_driverfs_files();
3462         if (ret < 0) {
3463                 printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
3464                         ret);
3465                 goto del_files;
3466         }
3467
3468         init_all_queued();
3469
3470         host_to_add = scsi_debug_add_host;
3471         scsi_debug_add_host = 0;
3472
3473         for (k = 0; k < host_to_add; k++) {
3474                 if (sdebug_add_adapter()) {
3475                         printk(KERN_ERR "scsi_debug_init: "
3476                                "sdebug_add_adapter failed k=%d\n", k);
3477                         break;
3478                 }
3479         }
3480
3481         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
3482                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
3483                        scsi_debug_add_host);
3484         }
3485         return 0;
3486
3487 del_files:
3488         do_remove_driverfs_files();
3489         driver_unregister(&sdebug_driverfs_driver);
3490 bus_unreg:
3491         bus_unregister(&pseudo_lld_bus);
3492 dev_unreg:
3493         root_device_unregister(pseudo_primary);
3494 free_vm:
3495         if (map_storep)
3496                 vfree(map_storep);
3497         if (dif_storep)
3498                 vfree(dif_storep);
3499         vfree(fake_storep);
3500
3501         return ret;
3502 }
3503
3504 static void __exit scsi_debug_exit(void)
3505 {
3506         int k = scsi_debug_add_host;
3507
3508         stop_all_queued();
3509         for (; k; k--)
3510                 sdebug_remove_adapter();
3511         do_remove_driverfs_files();
3512         driver_unregister(&sdebug_driverfs_driver);
3513         bus_unregister(&pseudo_lld_bus);
3514         root_device_unregister(pseudo_primary);
3515
3516         if (dif_storep)
3517                 vfree(dif_storep);
3518
3519         vfree(fake_storep);
3520 }
3521
3522 device_initcall(scsi_debug_init);
3523 module_exit(scsi_debug_exit);
3524
3525 static void sdebug_release_adapter(struct device * dev)
3526 {
3527         struct sdebug_host_info *sdbg_host;
3528
3529         sdbg_host = to_sdebug_host(dev);
3530         kfree(sdbg_host);
3531 }
3532
3533 static int sdebug_add_adapter(void)
3534 {
3535         int k, devs_per_host;
3536         int error = 0;
3537         struct sdebug_host_info *sdbg_host;
3538         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3539
3540         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
3541         if (NULL == sdbg_host) {
3542                 printk(KERN_ERR "%s: out of memory at line %d\n",
3543                        __func__, __LINE__);
3544                 return -ENOMEM;
3545         }
3546
3547         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
3548
3549         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
3550         for (k = 0; k < devs_per_host; k++) {
3551                 sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
3552                 if (!sdbg_devinfo) {
3553                         printk(KERN_ERR "%s: out of memory at line %d\n",
3554                                __func__, __LINE__);
3555                         error = -ENOMEM;
3556                         goto clean;
3557                 }
3558         }
3559
3560         spin_lock(&sdebug_host_list_lock);
3561         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
3562         spin_unlock(&sdebug_host_list_lock);
3563
3564         sdbg_host->dev.bus = &pseudo_lld_bus;
3565         sdbg_host->dev.parent = pseudo_primary;
3566         sdbg_host->dev.release = &sdebug_release_adapter;
3567         dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
3568
3569         error = device_register(&sdbg_host->dev);
3570
3571         if (error)
3572                 goto clean;
3573
3574         ++scsi_debug_add_host;
3575         return error;
3576
3577 clean:
3578         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
3579                                  dev_list) {
3580                 list_del(&sdbg_devinfo->dev_list);
3581                 kfree(sdbg_devinfo);
3582         }
3583
3584         kfree(sdbg_host);
3585         return error;
3586 }
3587
3588 static void sdebug_remove_adapter(void)
3589 {
3590         struct sdebug_host_info * sdbg_host = NULL;
3591
3592         spin_lock(&sdebug_host_list_lock);
3593         if (!list_empty(&sdebug_host_list)) {
3594                 sdbg_host = list_entry(sdebug_host_list.prev,
3595                                        struct sdebug_host_info, host_list);
3596                 list_del(&sdbg_host->host_list);
3597         }
3598         spin_unlock(&sdebug_host_list_lock);
3599
3600         if (!sdbg_host)
3601                 return;
3602
3603         device_unregister(&sdbg_host->dev);
3604         --scsi_debug_add_host;
3605 }
3606
3607 static
3608 int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
3609 {
3610         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
3611         int len, k;
3612         unsigned int num;
3613         unsigned long long lba;
3614         u32 ei_lba;
3615         int errsts = 0;
3616         int target = SCpnt->device->id;
3617         struct sdebug_dev_info *devip = NULL;
3618         int inj_recovered = 0;
3619         int inj_transport = 0;
3620         int inj_dif = 0;
3621         int inj_dix = 0;
3622         int delay_override = 0;
3623         int unmap = 0;
3624
3625         scsi_set_resid(SCpnt, 0);
3626         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
3627                 printk(KERN_INFO "scsi_debug: cmd ");
3628                 for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
3629                         printk("%02x ", (int)cmd[k]);
3630                 printk("\n");
3631         }
3632
3633         if (target == SCpnt->device->host->hostt->this_id) {
3634                 printk(KERN_INFO "scsi_debug: initiator's id used as "
3635                        "target!\n");
3636                 return schedule_resp(SCpnt, NULL, done,
3637                                      DID_NO_CONNECT << 16, 0);
3638         }
3639
3640         if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
3641             (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
3642                 return schedule_resp(SCpnt, NULL, done,
3643                                      DID_NO_CONNECT << 16, 0);
3644         devip = devInfoReg(SCpnt->device);
3645         if (NULL == devip)
3646                 return schedule_resp(SCpnt, NULL, done,
3647                                      DID_NO_CONNECT << 16, 0);
3648
3649         if ((scsi_debug_every_nth != 0) &&
3650             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
3651                 scsi_debug_cmnd_count = 0;
3652                 if (scsi_debug_every_nth < -1)
3653                         scsi_debug_every_nth = -1;
3654                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
3655                         return 0; /* ignore command causing timeout */
3656                 else if (SCSI_DEBUG_OPT_MAC_TIMEOUT & scsi_debug_opts &&
3657                          scsi_medium_access_command(SCpnt))
3658                         return 0; /* time out reads and writes */
3659                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
3660                         inj_recovered = 1; /* to reads and writes below */
3661                 else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
3662                         inj_transport = 1; /* to reads and writes below */
3663                 else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
3664                         inj_dif = 1; /* to reads and writes below */
3665                 else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
3666                         inj_dix = 1; /* to reads and writes below */
3667         }
3668
3669         if (devip->wlun) {
3670                 switch (*cmd) {
3671                 case INQUIRY:
3672                 case REQUEST_SENSE:
3673                 case TEST_UNIT_READY:
3674                 case REPORT_LUNS:
3675                         break;  /* only allowable wlun commands */
3676                 default:
3677                         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3678                                 printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
3679                                        "not supported for wlun\n", *cmd);
3680                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3681                                         INVALID_OPCODE, 0);
3682                         errsts = check_condition_result;
3683                         return schedule_resp(SCpnt, devip, done, errsts,
3684                                              0);
3685                 }
3686         }
3687
3688         switch (*cmd) {
3689         case INQUIRY:     /* mandatory, ignore unit attention */
3690                 delay_override = 1;
3691                 errsts = resp_inquiry(SCpnt, target, devip);
3692                 break;
3693         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
3694                 delay_override = 1;
3695                 errsts = resp_requests(SCpnt, devip);
3696                 break;
3697         case REZERO_UNIT:       /* actually this is REWIND for SSC */
3698         case START_STOP:
3699                 errsts = resp_start_stop(SCpnt, devip);
3700                 break;
3701         case ALLOW_MEDIUM_REMOVAL:
3702                 errsts = check_readiness(SCpnt, 1, devip);
3703                 if (errsts)
3704                         break;
3705                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3706                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
3707                                cmd[4] ? "inhibited" : "enabled");
3708                 break;
3709         case SEND_DIAGNOSTIC:     /* mandatory */
3710                 errsts = check_readiness(SCpnt, 1, devip);
3711                 break;
3712         case TEST_UNIT_READY:     /* mandatory */
3713                 delay_override = 1;
3714                 errsts = check_readiness(SCpnt, 0, devip);
3715                 break;
3716         case RESERVE:
3717                 errsts = check_readiness(SCpnt, 1, devip);
3718                 break;
3719         case RESERVE_10:
3720                 errsts = check_readiness(SCpnt, 1, devip);
3721                 break;
3722         case RELEASE:
3723                 errsts = check_readiness(SCpnt, 1, devip);
3724                 break;
3725         case RELEASE_10:
3726                 errsts = check_readiness(SCpnt, 1, devip);
3727                 break;
3728         case READ_CAPACITY:
3729                 errsts = resp_readcap(SCpnt, devip);
3730                 break;
3731         case SERVICE_ACTION_IN:
3732                 if (cmd[1] == SAI_READ_CAPACITY_16)
3733                         errsts = resp_readcap16(SCpnt, devip);
3734                 else if (cmd[1] == SAI_GET_LBA_STATUS) {
3735
3736                         if (scsi_debug_lbp() == 0) {
3737                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3738                                                 INVALID_COMMAND_OPCODE, 0);
3739                                 errsts = check_condition_result;
3740                         } else
3741                                 errsts = resp_get_lba_status(SCpnt, devip);
3742                 } else {
3743                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3744                                         INVALID_OPCODE, 0);
3745                         errsts = check_condition_result;
3746                 }
3747                 break;
3748         case MAINTENANCE_IN:
3749                 if (MI_REPORT_TARGET_PGS != cmd[1]) {
3750                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3751                                         INVALID_OPCODE, 0);
3752                         errsts = check_condition_result;
3753                         break;
3754                 }
3755                 errsts = resp_report_tgtpgs(SCpnt, devip);
3756                 break;
3757         case READ_16:
3758         case READ_12:
3759         case READ_10:
3760                 /* READ{10,12,16} and DIF Type 2 are natural enemies */
3761                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3762                     cmd[1] & 0xe0) {
3763                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3764                                         INVALID_COMMAND_OPCODE, 0);
3765                         errsts = check_condition_result;
3766                         break;
3767                 }
3768
3769                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3770                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3771                     (cmd[1] & 0xe0) == 0)
3772                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3773
3774                 /* fall through */
3775         case READ_6:
3776 read:
3777                 errsts = check_readiness(SCpnt, 0, devip);
3778                 if (errsts)
3779                         break;
3780                 if (scsi_debug_fake_rw)
3781                         break;
3782                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3783                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3784                 if (inj_recovered && (0 == errsts)) {
3785                         mk_sense_buffer(devip, RECOVERED_ERROR,
3786                                         THRESHOLD_EXCEEDED, 0);
3787                         errsts = check_condition_result;
3788                 } else if (inj_transport && (0 == errsts)) {
3789                         mk_sense_buffer(devip, ABORTED_COMMAND,
3790                                         TRANSPORT_PROBLEM, ACK_NAK_TO);
3791                         errsts = check_condition_result;
3792                 } else if (inj_dif && (0 == errsts)) {
3793                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3794                         errsts = illegal_condition_result;
3795                 } else if (inj_dix && (0 == errsts)) {
3796                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3797                         errsts = illegal_condition_result;
3798                 }
3799                 break;
3800         case REPORT_LUNS:       /* mandatory, ignore unit attention */
3801                 delay_override = 1;
3802                 errsts = resp_report_luns(SCpnt, devip);
3803                 break;
3804         case VERIFY:            /* 10 byte SBC-2 command */
3805                 errsts = check_readiness(SCpnt, 0, devip);
3806                 break;
3807         case WRITE_16:
3808         case WRITE_12:
3809         case WRITE_10:
3810                 /* WRITE{10,12,16} and DIF Type 2 are natural enemies */
3811                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3812                     cmd[1] & 0xe0) {
3813                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3814                                         INVALID_COMMAND_OPCODE, 0);
3815                         errsts = check_condition_result;
3816                         break;
3817                 }
3818
3819                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3820                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3821                     (cmd[1] & 0xe0) == 0)
3822                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3823
3824                 /* fall through */
3825         case WRITE_6:
3826 write:
3827                 errsts = check_readiness(SCpnt, 0, devip);
3828                 if (errsts)
3829                         break;
3830                 if (scsi_debug_fake_rw)
3831                         break;
3832                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3833                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3834                 if (inj_recovered && (0 == errsts)) {
3835                         mk_sense_buffer(devip, RECOVERED_ERROR,
3836                                         THRESHOLD_EXCEEDED, 0);
3837                         errsts = check_condition_result;
3838                 } else if (inj_dif && (0 == errsts)) {
3839                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3840                         errsts = illegal_condition_result;
3841                 } else if (inj_dix && (0 == errsts)) {
3842                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3843                         errsts = illegal_condition_result;
3844                 }
3845                 break;
3846         case WRITE_SAME_16:
3847         case WRITE_SAME:
3848                 if (cmd[1] & 0x8) {
3849                         if ((*cmd == WRITE_SAME_16 && scsi_debug_lbpws == 0) ||
3850                             (*cmd == WRITE_SAME && scsi_debug_lbpws10 == 0)) {
3851                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3852                                                 INVALID_FIELD_IN_CDB, 0);
3853                                 errsts = check_condition_result;
3854                         } else
3855                                 unmap = 1;
3856                 }
3857                 if (errsts)
3858                         break;
3859                 errsts = check_readiness(SCpnt, 0, devip);
3860                 if (errsts)
3861                         break;
3862                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3863                 errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
3864                 break;
3865         case UNMAP:
3866                 errsts = check_readiness(SCpnt, 0, devip);
3867                 if (errsts)
3868                         break;
3869
3870                 if (scsi_debug_unmap_max_desc == 0 || scsi_debug_lbpu == 0) {
3871                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3872                                         INVALID_COMMAND_OPCODE, 0);
3873                         errsts = check_condition_result;
3874                 } else
3875                         errsts = resp_unmap(SCpnt, devip);
3876                 break;
3877         case MODE_SENSE:
3878         case MODE_SENSE_10:
3879                 errsts = resp_mode_sense(SCpnt, target, devip);
3880                 break;
3881         case MODE_SELECT:
3882                 errsts = resp_mode_select(SCpnt, 1, devip);
3883                 break;
3884         case MODE_SELECT_10:
3885                 errsts = resp_mode_select(SCpnt, 0, devip);
3886                 break;
3887         case LOG_SENSE:
3888                 errsts = resp_log_sense(SCpnt, devip);
3889                 break;
3890         case SYNCHRONIZE_CACHE:
3891                 delay_override = 1;
3892                 errsts = check_readiness(SCpnt, 0, devip);
3893                 break;
3894         case WRITE_BUFFER:
3895                 errsts = check_readiness(SCpnt, 1, devip);
3896                 break;
3897         case XDWRITEREAD_10:
3898                 if (!scsi_bidi_cmnd(SCpnt)) {
3899                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3900                                         INVALID_FIELD_IN_CDB, 0);
3901                         errsts = check_condition_result;
3902                         break;
3903                 }
3904
3905                 errsts = check_readiness(SCpnt, 0, devip);
3906                 if (errsts)
3907                         break;
3908                 if (scsi_debug_fake_rw)
3909                         break;
3910                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3911                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3912                 if (errsts)
3913                         break;
3914                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3915                 if (errsts)
3916                         break;
3917                 errsts = resp_xdwriteread(SCpnt, lba, num, devip);
3918                 break;
3919         case VARIABLE_LENGTH_CMD:
3920                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
3921
3922                         if ((cmd[10] & 0xe0) == 0)
3923                                 printk(KERN_ERR
3924                                        "Unprotected RD/WR to DIF device\n");
3925
3926                         if (cmd[9] == READ_32) {
3927                                 BUG_ON(SCpnt->cmd_len < 32);
3928                                 goto read;
3929                         }
3930
3931                         if (cmd[9] == WRITE_32) {
3932                                 BUG_ON(SCpnt->cmd_len < 32);
3933                                 goto write;
3934                         }
3935                 }
3936
3937                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3938                                 INVALID_FIELD_IN_CDB, 0);
3939                 errsts = check_condition_result;
3940                 break;
3941
3942         default:
3943                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3944                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
3945                                "supported\n", *cmd);
3946                 errsts = check_readiness(SCpnt, 1, devip);
3947                 if (errsts)
3948                         break;  /* Unit attention takes precedence */
3949                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
3950                 errsts = check_condition_result;
3951                 break;
3952         }
3953         return schedule_resp(SCpnt, devip, done, errsts,
3954                              (delay_override ? 0 : scsi_debug_delay));
3955 }
3956
3957 static DEF_SCSI_QCMD(scsi_debug_queuecommand)
3958
3959 static struct scsi_host_template sdebug_driver_template = {
3960         .proc_info =            scsi_debug_proc_info,
3961         .proc_name =            sdebug_proc_name,
3962         .name =                 "SCSI DEBUG",
3963         .info =                 scsi_debug_info,
3964         .slave_alloc =          scsi_debug_slave_alloc,
3965         .slave_configure =      scsi_debug_slave_configure,
3966         .slave_destroy =        scsi_debug_slave_destroy,
3967         .ioctl =                scsi_debug_ioctl,
3968         .queuecommand =         scsi_debug_queuecommand,
3969         .eh_abort_handler =     scsi_debug_abort,
3970         .eh_bus_reset_handler = scsi_debug_bus_reset,
3971         .eh_device_reset_handler = scsi_debug_device_reset,
3972         .eh_host_reset_handler = scsi_debug_host_reset,
3973         .bios_param =           scsi_debug_biosparam,
3974         .can_queue =            SCSI_DEBUG_CANQUEUE,
3975         .this_id =              7,
3976         .sg_tablesize =         256,
3977         .cmd_per_lun =          16,
3978         .max_sectors =          0xffff,
3979         .use_clustering =       DISABLE_CLUSTERING,
3980         .module =               THIS_MODULE,
3981 };
3982
3983 static int sdebug_driver_probe(struct device * dev)
3984 {
3985         int error = 0;
3986         struct sdebug_host_info *sdbg_host;
3987         struct Scsi_Host *hpnt;
3988         int host_prot;
3989
3990         sdbg_host = to_sdebug_host(dev);
3991
3992         sdebug_driver_template.can_queue = scsi_debug_max_queue;
3993         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
3994         if (NULL == hpnt) {
3995                 printk(KERN_ERR "%s: scsi_register failed\n", __func__);
3996                 error = -ENODEV;
3997                 return error;
3998         }
3999
4000         sdbg_host->shost = hpnt;
4001         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
4002         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
4003                 hpnt->max_id = scsi_debug_num_tgts + 1;
4004         else
4005                 hpnt->max_id = scsi_debug_num_tgts;
4006         hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;  /* = scsi_debug_max_luns; */
4007
4008         host_prot = 0;
4009
4010         switch (scsi_debug_dif) {
4011
4012         case SD_DIF_TYPE1_PROTECTION:
4013                 host_prot = SHOST_DIF_TYPE1_PROTECTION;
4014                 if (scsi_debug_dix)
4015                         host_prot |= SHOST_DIX_TYPE1_PROTECTION;
4016                 break;
4017
4018         case SD_DIF_TYPE2_PROTECTION:
4019                 host_prot = SHOST_DIF_TYPE2_PROTECTION;
4020                 if (scsi_debug_dix)
4021                         host_prot |= SHOST_DIX_TYPE2_PROTECTION;
4022                 break;
4023
4024         case SD_DIF_TYPE3_PROTECTION:
4025                 host_prot = SHOST_DIF_TYPE3_PROTECTION;
4026                 if (scsi_debug_dix)
4027                         host_prot |= SHOST_DIX_TYPE3_PROTECTION;
4028                 break;
4029
4030         default:
4031                 if (scsi_debug_dix)
4032                         host_prot |= SHOST_DIX_TYPE0_PROTECTION;
4033                 break;
4034         }
4035
4036         scsi_host_set_prot(hpnt, host_prot);
4037
4038         printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
4039                (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
4040                (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
4041                (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
4042                (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
4043                (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
4044                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
4045                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
4046
4047         if (scsi_debug_guard == 1)
4048                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
4049         else
4050                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
4051
4052         error = scsi_add_host(hpnt, &sdbg_host->dev);
4053         if (error) {
4054                 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
4055                 error = -ENODEV;
4056                 scsi_host_put(hpnt);
4057         } else
4058                 scsi_scan_host(hpnt);
4059
4060
4061         return error;
4062 }
4063
4064 static int sdebug_driver_remove(struct device * dev)
4065 {
4066         struct sdebug_host_info *sdbg_host;
4067         struct sdebug_dev_info *sdbg_devinfo, *tmp;
4068
4069         sdbg_host = to_sdebug_host(dev);
4070
4071         if (!sdbg_host) {
4072                 printk(KERN_ERR "%s: Unable to locate host info\n",
4073                        __func__);
4074                 return -ENODEV;
4075         }
4076
4077         scsi_remove_host(sdbg_host->shost);
4078
4079         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
4080                                  dev_list) {
4081                 list_del(&sdbg_devinfo->dev_list);
4082                 kfree(sdbg_devinfo);
4083         }
4084
4085         scsi_host_put(sdbg_host->shost);
4086         return 0;
4087 }
4088
4089 static int pseudo_lld_bus_match(struct device *dev,
4090                                 struct device_driver *dev_driver)
4091 {
4092         return 1;
4093 }
4094
4095 static struct bus_type pseudo_lld_bus = {
4096         .name = "pseudo",
4097         .match = pseudo_lld_bus_match,
4098         .probe = sdebug_driver_probe,
4099         .remove = sdebug_driver_remove,
4100 };