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 <[email protected]> max_luns+scsi_level [20021031]
  23  *   Mike Anderson <[email protected]> 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 long lba_to_map_index(sector_t lba)
2001 {
2002         if (scsi_debug_unmap_alignment) {
2003                 lba += scsi_debug_unmap_granularity -
2004                         scsi_debug_unmap_alignment;
2005         }
2006         do_div(lba, scsi_debug_unmap_granularity);
2007
2008         return lba;
2009 }
2010
2011 static sector_t map_index_to_lba(unsigned long index)
2012 {
2013         return index * scsi_debug_unmap_granularity -
2014                 scsi_debug_unmap_alignment;
2015 }
2016
2017 static unsigned int map_state(sector_t lba, unsigned int *num)
2018 {
2019         sector_t end;
2020         unsigned int mapped;
2021         unsigned long index;
2022         unsigned long next;
2023
2024         index = lba_to_map_index(lba);
2025         mapped = test_bit(index, map_storep);
2026
2027         if (mapped)
2028                 next = find_next_zero_bit(map_storep, map_size, index);
2029         else
2030                 next = find_next_bit(map_storep, map_size, index);
2031
2032         end = min_t(sector_t, sdebug_store_sectors,  map_index_to_lba(next));
2033         *num = end - lba;
2034
2035         return mapped;
2036 }
2037
2038 static void map_region(sector_t lba, unsigned int len)
2039 {
2040         sector_t end = lba + len;
2041
2042         while (lba < end) {
2043                 unsigned long index = lba_to_map_index(lba);
2044
2045                 if (index < map_size)
2046                         set_bit(index, map_storep);
2047
2048                 lba = map_index_to_lba(index + 1);
2049         }
2050 }
2051
2052 static void unmap_region(sector_t lba, unsigned int len)
2053 {
2054         sector_t end = lba + len;
2055
2056         while (lba < end) {
2057                 unsigned long index = lba_to_map_index(lba);
2058
2059                 if (lba == map_index_to_lba(index) &&
2060                     lba + scsi_debug_unmap_granularity <= end &&
2061                     index < map_size) {
2062                         clear_bit(index, map_storep);
2063                         if (scsi_debug_lbprz) {
2064                                 memset(fake_storep +
2065                                        lba * scsi_debug_sector_size, 0,
2066                                        scsi_debug_sector_size *
2067                                        scsi_debug_unmap_granularity);
2068                         }
2069                 }
2070                 lba = map_index_to_lba(index + 1);
2071         }
2072 }
2073
2074 static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
2075                       unsigned int num, struct sdebug_dev_info *devip,
2076                       u32 ei_lba)
2077 {
2078         unsigned long iflags;
2079         int ret;
2080
2081         ret = check_device_access_params(devip, lba, num);
2082         if (ret)
2083                 return ret;
2084
2085         /* DIX + T10 DIF */
2086         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
2087                 int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
2088
2089                 if (prot_ret) {
2090                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
2091                         return illegal_condition_result;
2092                 }
2093         }
2094
2095         write_lock_irqsave(&atomic_rw, iflags);
2096         ret = do_device_access(SCpnt, devip, lba, num, 1);
2097         if (scsi_debug_lbp())
2098                 map_region(lba, num);
2099         write_unlock_irqrestore(&atomic_rw, iflags);
2100         if (-1 == ret)
2101                 return (DID_ERROR << 16);
2102         else if ((ret < (num * scsi_debug_sector_size)) &&
2103                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2104                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
2105                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2106
2107         return 0;
2108 }
2109
2110 static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
2111                       unsigned int num, struct sdebug_dev_info *devip,
2112                            u32 ei_lba, unsigned int unmap)
2113 {
2114         unsigned long iflags;
2115         unsigned long long i;
2116         int ret;
2117
2118         ret = check_device_access_params(devip, lba, num);
2119         if (ret)
2120                 return ret;
2121
2122         if (num > scsi_debug_write_same_length) {
2123                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2124                                 0);
2125                 return check_condition_result;
2126         }
2127
2128         write_lock_irqsave(&atomic_rw, iflags);
2129
2130         if (unmap && scsi_debug_lbp()) {
2131                 unmap_region(lba, num);
2132                 goto out;
2133         }
2134
2135         /* Else fetch one logical block */
2136         ret = fetch_to_dev_buffer(scmd,
2137                                   fake_storep + (lba * scsi_debug_sector_size),
2138                                   scsi_debug_sector_size);
2139
2140         if (-1 == ret) {
2141                 write_unlock_irqrestore(&atomic_rw, iflags);
2142                 return (DID_ERROR << 16);
2143         } else if ((ret < (num * scsi_debug_sector_size)) &&
2144                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2145                 printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
2146                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2147
2148         /* Copy first sector to remaining blocks */
2149         for (i = 1 ; i < num ; i++)
2150                 memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
2151                        fake_storep + (lba * scsi_debug_sector_size),
2152                        scsi_debug_sector_size);
2153
2154         if (scsi_debug_lbp())
2155                 map_region(lba, num);
2156 out:
2157         write_unlock_irqrestore(&atomic_rw, iflags);
2158
2159         return 0;
2160 }
2161
2162 struct unmap_block_desc {
2163         __be64  lba;
2164         __be32  blocks;
2165         __be32  __reserved;
2166 };
2167
2168 static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
2169 {
2170         unsigned char *buf;
2171         struct unmap_block_desc *desc;
2172         unsigned int i, payload_len, descriptors;
2173         int ret;
2174
2175         ret = check_readiness(scmd, 1, devip);
2176         if (ret)
2177                 return ret;
2178
2179         payload_len = get_unaligned_be16(&scmd->cmnd[7]);
2180         BUG_ON(scsi_bufflen(scmd) != payload_len);
2181
2182         descriptors = (payload_len - 8) / 16;
2183
2184         buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
2185         if (!buf)
2186                 return check_condition_result;
2187
2188         scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
2189
2190         BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
2191         BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
2192
2193         desc = (void *)&buf[8];
2194
2195         for (i = 0 ; i < descriptors ; i++) {
2196                 unsigned long long lba = get_unaligned_be64(&desc[i].lba);
2197                 unsigned int num = get_unaligned_be32(&desc[i].blocks);
2198
2199                 ret = check_device_access_params(devip, lba, num);
2200                 if (ret)
2201                         goto out;
2202
2203                 unmap_region(lba, num);
2204         }
2205
2206         ret = 0;
2207
2208 out:
2209         kfree(buf);
2210
2211         return ret;
2212 }
2213
2214 #define SDEBUG_GET_LBA_STATUS_LEN 32
2215
2216 static int resp_get_lba_status(struct scsi_cmnd * scmd,
2217                                struct sdebug_dev_info * devip)
2218 {
2219         unsigned long long lba;
2220         unsigned int alloc_len, mapped, num;
2221         unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
2222         int ret;
2223
2224         ret = check_readiness(scmd, 1, devip);
2225         if (ret)
2226                 return ret;
2227
2228         lba = get_unaligned_be64(&scmd->cmnd[2]);
2229         alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
2230
2231         if (alloc_len < 24)
2232                 return 0;
2233
2234         ret = check_device_access_params(devip, lba, 1);
2235         if (ret)
2236                 return ret;
2237
2238         mapped = map_state(lba, &num);
2239
2240         memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
2241         put_unaligned_be32(20, &arr[0]);        /* Parameter Data Length */
2242         put_unaligned_be64(lba, &arr[8]);       /* LBA */
2243         put_unaligned_be32(num, &arr[16]);      /* Number of blocks */
2244         arr[20] = !mapped;                      /* mapped = 0, unmapped = 1 */
2245
2246         return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
2247 }
2248
2249 #define SDEBUG_RLUN_ARR_SZ 256
2250
2251 static int resp_report_luns(struct scsi_cmnd * scp,
2252                             struct sdebug_dev_info * devip)
2253 {
2254         unsigned int alloc_len;
2255         int lun_cnt, i, upper, num, n, wlun, lun;
2256         unsigned char *cmd = (unsigned char *)scp->cmnd;
2257         int select_report = (int)cmd[2];
2258         struct scsi_lun *one_lun;
2259         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
2260         unsigned char * max_addr;
2261
2262         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
2263         if ((alloc_len < 4) || (select_report > 2)) {
2264                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2265                                 0);
2266                 return check_condition_result;
2267         }
2268         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
2269         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
2270         lun_cnt = scsi_debug_max_luns;
2271         if (1 == select_report)
2272                 lun_cnt = 0;
2273         else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
2274                 --lun_cnt;
2275         wlun = (select_report > 0) ? 1 : 0;
2276         num = lun_cnt + wlun;
2277         arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
2278         arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
2279         n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
2280                             sizeof(struct scsi_lun)), num);
2281         if (n < num) {
2282                 wlun = 0;
2283                 lun_cnt = n;
2284         }
2285         one_lun = (struct scsi_lun *) &arr[8];
2286         max_addr = arr + SDEBUG_RLUN_ARR_SZ;
2287         for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
2288              ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
2289              i++, lun++) {
2290                 upper = (lun >> 8) & 0x3f;
2291                 if (upper)
2292                         one_lun[i].scsi_lun[0] =
2293                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
2294                 one_lun[i].scsi_lun[1] = lun & 0xff;
2295         }
2296         if (wlun) {
2297                 one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
2298                 one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
2299                 i++;
2300         }
2301         alloc_len = (unsigned char *)(one_lun + i) - arr;
2302         return fill_from_dev_buffer(scp, arr,
2303                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
2304 }
2305
2306 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
2307                             unsigned int num, struct sdebug_dev_info *devip)
2308 {
2309         int i, j, ret = -1;
2310         unsigned char *kaddr, *buf;
2311         unsigned int offset;
2312         struct scatterlist *sg;
2313         struct scsi_data_buffer *sdb = scsi_in(scp);
2314
2315         /* better not to use temporary buffer. */
2316         buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
2317         if (!buf)
2318                 return ret;
2319
2320         scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
2321
2322         offset = 0;
2323         for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
2324                 kaddr = (unsigned char *)kmap_atomic(sg_page(sg));
2325                 if (!kaddr)
2326                         goto out;
2327
2328                 for (j = 0; j < sg->length; j++)
2329                         *(kaddr + sg->offset + j) ^= *(buf + offset + j);
2330
2331                 offset += sg->length;
2332                 kunmap_atomic(kaddr);
2333         }
2334         ret = 0;
2335 out:
2336         kfree(buf);
2337
2338         return ret;
2339 }
2340
2341 /* When timer goes off this function is called. */
2342 static void timer_intr_handler(unsigned long indx)
2343 {
2344         struct sdebug_queued_cmd * sqcp;
2345         unsigned long iflags;
2346
2347         if (indx >= scsi_debug_max_queue) {
2348                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
2349                        "large\n");
2350                 return;
2351         }
2352         spin_lock_irqsave(&queued_arr_lock, iflags);
2353         sqcp = &queued_arr[(int)indx];
2354         if (! sqcp->in_use) {
2355                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
2356                        "interrupt\n");
2357                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2358                 return;
2359         }
2360         sqcp->in_use = 0;
2361         if (sqcp->done_funct) {
2362                 sqcp->a_cmnd->result = sqcp->scsi_result;
2363                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
2364         }
2365         sqcp->done_funct = NULL;
2366         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2367 }
2368
2369
2370 static struct sdebug_dev_info *
2371 sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
2372 {
2373         struct sdebug_dev_info *devip;
2374
2375         devip = kzalloc(sizeof(*devip), flags);
2376         if (devip) {
2377                 devip->sdbg_host = sdbg_host;
2378                 list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
2379         }
2380         return devip;
2381 }
2382
2383 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
2384 {
2385         struct sdebug_host_info * sdbg_host;
2386         struct sdebug_dev_info * open_devip = NULL;
2387         struct sdebug_dev_info * devip =
2388                         (struct sdebug_dev_info *)sdev->hostdata;
2389
2390         if (devip)
2391                 return devip;
2392         sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
2393         if (!sdbg_host) {
2394                 printk(KERN_ERR "Host info NULL\n");
2395                 return NULL;
2396         }
2397         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
2398                 if ((devip->used) && (devip->channel == sdev->channel) &&
2399                     (devip->target == sdev->id) &&
2400                     (devip->lun == sdev->lun))
2401                         return devip;
2402                 else {
2403                         if ((!devip->used) && (!open_devip))
2404                                 open_devip = devip;
2405                 }
2406         }
2407         if (!open_devip) { /* try and make a new one */
2408                 open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
2409                 if (!open_devip) {
2410                         printk(KERN_ERR "%s: out of memory at line %d\n",
2411                                 __func__, __LINE__);
2412                         return NULL;
2413                 }
2414         }
2415
2416         open_devip->channel = sdev->channel;
2417         open_devip->target = sdev->id;
2418         open_devip->lun = sdev->lun;
2419         open_devip->sdbg_host = sdbg_host;
2420         open_devip->reset = 1;
2421         open_devip->used = 1;
2422         memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
2423         if (scsi_debug_dsense)
2424                 open_devip->sense_buff[0] = 0x72;
2425         else {
2426                 open_devip->sense_buff[0] = 0x70;
2427                 open_devip->sense_buff[7] = 0xa;
2428         }
2429         if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
2430                 open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
2431
2432         return open_devip;
2433 }
2434
2435 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
2436 {
2437         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2438                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
2439                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2440         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
2441         return 0;
2442 }
2443
2444 static int scsi_debug_slave_configure(struct scsi_device *sdp)
2445 {
2446         struct sdebug_dev_info *devip;
2447
2448         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2449                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
2450                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2451         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
2452                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
2453         devip = devInfoReg(sdp);
2454         if (NULL == devip)
2455                 return 1;       /* no resources, will be marked offline */
2456         sdp->hostdata = devip;
2457         if (sdp->host->cmd_per_lun)
2458                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
2459                                         sdp->host->cmd_per_lun);
2460         blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
2461         if (scsi_debug_no_uld)
2462                 sdp->no_uld_attach = 1;
2463         return 0;
2464 }
2465
2466 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
2467 {
2468         struct sdebug_dev_info *devip =
2469                 (struct sdebug_dev_info *)sdp->hostdata;
2470
2471         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2472                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
2473                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2474         if (devip) {
2475                 /* make this slot available for re-use */
2476                 devip->used = 0;
2477                 sdp->hostdata = NULL;
2478         }
2479 }
2480
2481 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
2482 static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
2483 {
2484         unsigned long iflags;
2485         int k;
2486         struct sdebug_queued_cmd *sqcp;
2487
2488         spin_lock_irqsave(&queued_arr_lock, iflags);
2489         for (k = 0; k < scsi_debug_max_queue; ++k) {
2490                 sqcp = &queued_arr[k];
2491                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
2492                         del_timer_sync(&sqcp->cmnd_timer);
2493                         sqcp->in_use = 0;
2494                         sqcp->a_cmnd = NULL;
2495                         break;
2496                 }
2497         }
2498         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2499         return (k < scsi_debug_max_queue) ? 1 : 0;
2500 }
2501
2502 /* Deletes (stops) timers of all queued commands */
2503 static void stop_all_queued(void)
2504 {
2505         unsigned long iflags;
2506         int k;
2507         struct sdebug_queued_cmd *sqcp;
2508
2509         spin_lock_irqsave(&queued_arr_lock, iflags);
2510         for (k = 0; k < scsi_debug_max_queue; ++k) {
2511                 sqcp = &queued_arr[k];
2512                 if (sqcp->in_use && sqcp->a_cmnd) {
2513                         del_timer_sync(&sqcp->cmnd_timer);
2514                         sqcp->in_use = 0;
2515                         sqcp->a_cmnd = NULL;
2516                 }
2517         }
2518         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2519 }
2520
2521 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
2522 {
2523         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2524                 printk(KERN_INFO "scsi_debug: abort\n");
2525         ++num_aborts;
2526         stop_queued_cmnd(SCpnt);
2527         return SUCCESS;
2528 }
2529
2530 static int scsi_debug_biosparam(struct scsi_device *sdev,
2531                 struct block_device * bdev, sector_t capacity, int *info)
2532 {
2533         int res;
2534         unsigned char *buf;
2535
2536         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2537                 printk(KERN_INFO "scsi_debug: biosparam\n");
2538         buf = scsi_bios_ptable(bdev);
2539         if (buf) {
2540                 res = scsi_partsize(buf, capacity,
2541                                     &info[2], &info[0], &info[1]);
2542                 kfree(buf);
2543                 if (! res)
2544                         return res;
2545         }
2546         info[0] = sdebug_heads;
2547         info[1] = sdebug_sectors_per;
2548         info[2] = sdebug_cylinders_per;
2549         return 0;
2550 }
2551
2552 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
2553 {
2554         struct sdebug_dev_info * devip;
2555
2556         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2557                 printk(KERN_INFO "scsi_debug: device_reset\n");
2558         ++num_dev_resets;
2559         if (SCpnt) {
2560                 devip = devInfoReg(SCpnt->device);
2561                 if (devip)
2562                         devip->reset = 1;
2563         }
2564         return SUCCESS;
2565 }
2566
2567 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
2568 {
2569         struct sdebug_host_info *sdbg_host;
2570         struct sdebug_dev_info * dev_info;
2571         struct scsi_device * sdp;
2572         struct Scsi_Host * hp;
2573
2574         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2575                 printk(KERN_INFO "scsi_debug: bus_reset\n");
2576         ++num_bus_resets;
2577         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
2578                 sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
2579                 if (sdbg_host) {
2580                         list_for_each_entry(dev_info,
2581                                             &sdbg_host->dev_info_list,
2582                                             dev_list)
2583                                 dev_info->reset = 1;
2584                 }
2585         }
2586         return SUCCESS;
2587 }
2588
2589 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
2590 {
2591         struct sdebug_host_info * sdbg_host;
2592         struct sdebug_dev_info * dev_info;
2593
2594         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2595                 printk(KERN_INFO "scsi_debug: host_reset\n");
2596         ++num_host_resets;
2597         spin_lock(&sdebug_host_list_lock);
2598         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
2599                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
2600                                     dev_list)
2601                         dev_info->reset = 1;
2602         }
2603         spin_unlock(&sdebug_host_list_lock);
2604         stop_all_queued();
2605         return SUCCESS;
2606 }
2607
2608 /* Initializes timers in queued array */
2609 static void __init init_all_queued(void)
2610 {
2611         unsigned long iflags;
2612         int k;
2613         struct sdebug_queued_cmd * sqcp;
2614
2615         spin_lock_irqsave(&queued_arr_lock, iflags);
2616         for (k = 0; k < scsi_debug_max_queue; ++k) {
2617                 sqcp = &queued_arr[k];
2618                 init_timer(&sqcp->cmnd_timer);
2619                 sqcp->in_use = 0;
2620                 sqcp->a_cmnd = NULL;
2621         }
2622         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2623 }
2624
2625 static void __init sdebug_build_parts(unsigned char *ramp,
2626                                       unsigned long store_size)
2627 {
2628         struct partition * pp;
2629         int starts[SDEBUG_MAX_PARTS + 2];
2630         int sectors_per_part, num_sectors, k;
2631         int heads_by_sects, start_sec, end_sec;
2632
2633         /* assume partition table already zeroed */
2634         if ((scsi_debug_num_parts < 1) || (store_size < 1048576))
2635                 return;
2636         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
2637                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
2638                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
2639                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
2640         }
2641         num_sectors = (int)sdebug_store_sectors;
2642         sectors_per_part = (num_sectors - sdebug_sectors_per)
2643                            / scsi_debug_num_parts;
2644         heads_by_sects = sdebug_heads * sdebug_sectors_per;
2645         starts[0] = sdebug_sectors_per;
2646         for (k = 1; k < scsi_debug_num_parts; ++k)
2647                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
2648                             * heads_by_sects;
2649         starts[scsi_debug_num_parts] = num_sectors;
2650         starts[scsi_debug_num_parts + 1] = 0;
2651
2652         ramp[510] = 0x55;       /* magic partition markings */
2653         ramp[511] = 0xAA;
2654         pp = (struct partition *)(ramp + 0x1be);
2655         for (k = 0; starts[k + 1]; ++k, ++pp) {
2656                 start_sec = starts[k];
2657                 end_sec = starts[k + 1] - 1;
2658                 pp->boot_ind = 0;
2659
2660                 pp->cyl = start_sec / heads_by_sects;
2661                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
2662                            / sdebug_sectors_per;
2663                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
2664
2665                 pp->end_cyl = end_sec / heads_by_sects;
2666                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
2667                                / sdebug_sectors_per;
2668                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
2669
2670                 pp->start_sect = start_sec;
2671                 pp->nr_sects = end_sec - start_sec + 1;
2672                 pp->sys_ind = 0x83;     /* plain Linux partition */
2673         }
2674 }
2675
2676 static int schedule_resp(struct scsi_cmnd * cmnd,
2677                          struct sdebug_dev_info * devip,
2678                          done_funct_t done, int scsi_result, int delta_jiff)
2679 {
2680         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
2681                 if (scsi_result) {
2682                         struct scsi_device * sdp = cmnd->device;
2683
2684                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
2685                                "non-zero result=0x%x\n", sdp->host->host_no,
2686                                sdp->channel, sdp->id, sdp->lun, scsi_result);
2687                 }
2688         }
2689         if (cmnd && devip) {
2690                 /* simulate autosense by this driver */
2691                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
2692                         memcpy(cmnd->sense_buffer, devip->sense_buff,
2693                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
2694                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
2695         }
2696         if (delta_jiff <= 0) {
2697                 if (cmnd)
2698                         cmnd->result = scsi_result;
2699                 if (done)
2700                         done(cmnd);
2701                 return 0;
2702         } else {
2703                 unsigned long iflags;
2704                 int k;
2705                 struct sdebug_queued_cmd * sqcp = NULL;
2706
2707                 spin_lock_irqsave(&queued_arr_lock, iflags);
2708                 for (k = 0; k < scsi_debug_max_queue; ++k) {
2709                         sqcp = &queued_arr[k];
2710                         if (! sqcp->in_use)
2711                                 break;
2712                 }
2713                 if (k >= scsi_debug_max_queue) {
2714                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2715                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
2716                         return 1;       /* report busy to mid level */
2717                 }
2718                 sqcp->in_use = 1;
2719                 sqcp->a_cmnd = cmnd;
2720                 sqcp->scsi_result = scsi_result;
2721                 sqcp->done_funct = done;
2722                 sqcp->cmnd_timer.function = timer_intr_handler;
2723                 sqcp->cmnd_timer.data = k;
2724                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
2725                 add_timer(&sqcp->cmnd_timer);
2726                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2727                 if (cmnd)
2728                         cmnd->result = 0;
2729                 return 0;
2730         }
2731 }
2732 /* Note: The following macros create attribute files in the
2733    /sys/module/scsi_debug/parameters directory. Unfortunately this
2734    driver is unaware of a change and cannot trigger auxiliary actions
2735    as it can when the corresponding attribute in the
2736    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
2737  */
2738 module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
2739 module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
2740 module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
2741 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
2742 module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
2743 module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
2744 module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
2745 module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
2746 module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
2747 module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
2748 module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
2749 module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
2750 module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
2751 module_param_named(lbprz, scsi_debug_lbprz, int, S_IRUGO);
2752 module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
2753 module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
2754 module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
2755 module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
2756 module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
2757 module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
2758 module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
2759 module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
2760 module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
2761 module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
2762 module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
2763 module_param_named(removable, scsi_debug_removable, bool, S_IRUGO | S_IWUSR);
2764 module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
2765 module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
2766 module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
2767 module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
2768 module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
2769 module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
2770 module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
2771 module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
2772                    S_IRUGO | S_IWUSR);
2773 module_param_named(write_same_length, scsi_debug_write_same_length, int,
2774                    S_IRUGO | S_IWUSR);
2775
2776 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
2777 MODULE_DESCRIPTION("SCSI debug adapter driver");
2778 MODULE_LICENSE("GPL");
2779 MODULE_VERSION(SCSI_DEBUG_VERSION);
2780
2781 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
2782 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
2783 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
2784 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)");
2785 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
2786 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
2787 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
2788 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
2789 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
2790 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
2791 MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
2792 MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
2793 MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
2794 MODULE_PARM_DESC(lbprz, "unmapped blocks return 0 on read (def=1)");
2795 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
2796 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
2797 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
2798 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
2799 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
2800 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
2801 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
2802 MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
2803 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
2804 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
2805 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
2806 MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
2807 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
2808 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
2809 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
2810 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
2811 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
2812 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
2813 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
2814 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
2815 MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
2816
2817 static char sdebug_info[256];
2818
2819 static const char * scsi_debug_info(struct Scsi_Host * shp)
2820 {
2821         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
2822                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
2823                 scsi_debug_version_date, scsi_debug_dev_size_mb,
2824                 scsi_debug_opts);
2825         return sdebug_info;
2826 }
2827
2828 /* scsi_debug_proc_info
2829  * Used if the driver currently has no own support for /proc/scsi
2830  */
2831 static int scsi_debug_write_info(struct Scsi_Host *host, char *buffer, int length)
2832 {
2833         char arr[16];
2834         int opts;
2835         int minLen = length > 15 ? 15 : length;
2836
2837         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2838                 return -EACCES;
2839         memcpy(arr, buffer, minLen);
2840         arr[minLen] = '\0';
2841         if (1 != sscanf(arr, "%d", &opts))
2842                 return -EINVAL;
2843         scsi_debug_opts = opts;
2844         if (scsi_debug_every_nth != 0)
2845                 scsi_debug_cmnd_count = 0;
2846         return length;
2847 }
2848
2849 static int scsi_debug_show_info(struct seq_file *m, struct Scsi_Host *host)
2850 {
2851         seq_printf(m, "scsi_debug adapter driver, version "
2852             "%s [%s]\n"
2853             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
2854             "every_nth=%d(curr:%d)\n"
2855             "delay=%d, max_luns=%d, scsi_level=%d\n"
2856             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
2857             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
2858             "host_resets=%d\ndix_reads=%d dix_writes=%d dif_errors=%d\n",
2859             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
2860             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
2861             scsi_debug_cmnd_count, scsi_debug_delay,
2862             scsi_debug_max_luns, scsi_debug_scsi_level,
2863             scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
2864             sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
2865             num_host_resets, dix_reads, dix_writes, dif_errors);
2866         return 0;
2867 }
2868
2869 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
2870 {
2871         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
2872 }
2873
2874 static ssize_t sdebug_delay_store(struct device_driver * ddp,
2875                                   const char * buf, size_t count)
2876 {
2877         int delay;
2878         char work[20];
2879
2880         if (1 == sscanf(buf, "%10s", work)) {
2881                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
2882                         scsi_debug_delay = delay;
2883                         return count;
2884                 }
2885         }
2886         return -EINVAL;
2887 }
2888 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
2889             sdebug_delay_store);
2890
2891 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
2892 {
2893         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
2894 }
2895
2896 static ssize_t sdebug_opts_store(struct device_driver * ddp,
2897                                  const char * buf, size_t count)
2898 {
2899         int opts;
2900         char work[20];
2901
2902         if (1 == sscanf(buf, "%10s", work)) {
2903                 if (0 == strnicmp(work,"0x", 2)) {
2904                         if (1 == sscanf(&work[2], "%x", &opts))
2905                                 goto opts_done;
2906                 } else {
2907                         if (1 == sscanf(work, "%d", &opts))
2908                                 goto opts_done;
2909                 }
2910         }
2911         return -EINVAL;
2912 opts_done:
2913         scsi_debug_opts = opts;
2914         scsi_debug_cmnd_count = 0;
2915         return count;
2916 }
2917 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
2918             sdebug_opts_store);
2919
2920 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
2921 {
2922         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
2923 }
2924 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
2925                                   const char * buf, size_t count)
2926 {
2927         int n;
2928
2929         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2930                 scsi_debug_ptype = n;
2931                 return count;
2932         }
2933         return -EINVAL;
2934 }
2935 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
2936
2937 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
2938 {
2939         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
2940 }
2941 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
2942                                   const char * buf, size_t count)
2943 {
2944         int n;
2945
2946         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2947                 scsi_debug_dsense = n;
2948                 return count;
2949         }
2950         return -EINVAL;
2951 }
2952 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
2953             sdebug_dsense_store);
2954
2955 static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)
2956 {
2957         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
2958 }
2959 static ssize_t sdebug_fake_rw_store(struct device_driver * ddp,
2960                                     const char * buf, size_t count)
2961 {
2962         int n;
2963
2964         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2965                 scsi_debug_fake_rw = n;
2966                 return count;
2967         }
2968         return -EINVAL;
2969 }
2970 DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
2971             sdebug_fake_rw_store);
2972
2973 static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
2974 {
2975         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
2976 }
2977 static ssize_t sdebug_no_lun_0_store(struct device_driver * ddp,
2978                                      const char * buf, size_t count)
2979 {
2980         int n;
2981
2982         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2983                 scsi_debug_no_lun_0 = n;
2984                 return count;
2985         }
2986         return -EINVAL;
2987 }
2988 DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
2989             sdebug_no_lun_0_store);
2990
2991 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
2992 {
2993         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
2994 }
2995 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
2996                                      const char * buf, size_t count)
2997 {
2998         int n;
2999
3000         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3001                 scsi_debug_num_tgts = n;
3002                 sdebug_max_tgts_luns();
3003                 return count;
3004         }
3005         return -EINVAL;
3006 }
3007 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
3008             sdebug_num_tgts_store);
3009
3010 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
3011 {
3012         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
3013 }
3014 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
3015
3016 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
3017 {
3018         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
3019 }
3020 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
3021
3022 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
3023 {
3024         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
3025 }
3026 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
3027                                       const char * buf, size_t count)
3028 {
3029         int nth;
3030
3031         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
3032                 scsi_debug_every_nth = nth;
3033                 scsi_debug_cmnd_count = 0;
3034                 return count;
3035         }
3036         return -EINVAL;
3037 }
3038 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
3039             sdebug_every_nth_store);
3040
3041 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
3042 {
3043         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
3044 }
3045 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
3046                                      const char * buf, size_t count)
3047 {
3048         int n;
3049
3050         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3051                 scsi_debug_max_luns = n;
3052                 sdebug_max_tgts_luns();
3053                 return count;
3054         }
3055         return -EINVAL;
3056 }
3057 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
3058             sdebug_max_luns_store);
3059
3060 static ssize_t sdebug_max_queue_show(struct device_driver * ddp, char * buf)
3061 {
3062         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
3063 }
3064 static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
3065                                       const char * buf, size_t count)
3066 {
3067         int n;
3068
3069         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
3070             (n <= SCSI_DEBUG_CANQUEUE)) {
3071                 scsi_debug_max_queue = n;
3072                 return count;
3073         }
3074         return -EINVAL;
3075 }
3076 DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
3077             sdebug_max_queue_store);
3078
3079 static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
3080 {
3081         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
3082 }
3083 DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
3084
3085 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
3086 {
3087         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
3088 }
3089 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
3090
3091 static ssize_t sdebug_virtual_gb_show(struct device_driver * ddp, char * buf)
3092 {
3093         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
3094 }
3095 static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
3096                                        const char * buf, size_t count)
3097 {
3098         int n;
3099
3100         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3101                 scsi_debug_virtual_gb = n;
3102
3103                 sdebug_capacity = get_sdebug_capacity();
3104
3105                 return count;
3106         }
3107         return -EINVAL;
3108 }
3109 DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
3110             sdebug_virtual_gb_store);
3111
3112 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
3113 {
3114         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
3115 }
3116
3117 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
3118                                      const char * buf, size_t count)
3119 {
3120         int delta_hosts;
3121
3122         if (sscanf(buf, "%d", &delta_hosts) != 1)
3123                 return -EINVAL;
3124         if (delta_hosts > 0) {
3125                 do {
3126                         sdebug_add_adapter();
3127                 } while (--delta_hosts);
3128         } else if (delta_hosts < 0) {
3129                 do {
3130                         sdebug_remove_adapter();
3131                 } while (++delta_hosts);
3132         }
3133         return count;
3134 }
3135 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
3136             sdebug_add_host_store);
3137
3138 static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
3139                                           char * buf)
3140 {
3141         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
3142 }
3143 static ssize_t sdebug_vpd_use_hostno_store(struct device_driver * ddp,
3144                                            const char * buf, size_t count)
3145 {
3146         int n;
3147
3148         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3149                 scsi_debug_vpd_use_hostno = n;
3150                 return count;
3151         }
3152         return -EINVAL;
3153 }
3154 DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
3155             sdebug_vpd_use_hostno_store);
3156
3157 static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
3158 {
3159         return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
3160 }
3161 DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
3162
3163 static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
3164 {
3165         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
3166 }
3167 DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
3168
3169 static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
3170 {
3171         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
3172 }
3173 DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
3174
3175 static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
3176 {
3177         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
3178 }
3179 DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
3180
3181 static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
3182 {
3183         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
3184 }
3185 DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
3186
3187 static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
3188 {
3189         ssize_t count;
3190
3191         if (!scsi_debug_lbp())
3192                 return scnprintf(buf, PAGE_SIZE, "0-%u\n",
3193                                  sdebug_store_sectors);
3194
3195         count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
3196
3197         buf[count++] = '\n';
3198         buf[count++] = 0;
3199
3200         return count;
3201 }
3202 DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
3203
3204 static ssize_t sdebug_removable_show(struct device_driver *ddp,
3205                                      char *buf)
3206 {
3207         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_removable ? 1 : 0);
3208 }
3209 static ssize_t sdebug_removable_store(struct device_driver *ddp,
3210                                       const char *buf, size_t count)
3211 {
3212         int n;
3213
3214         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3215                 scsi_debug_removable = (n > 0);
3216                 return count;
3217         }
3218         return -EINVAL;
3219 }
3220 DRIVER_ATTR(removable, S_IRUGO | S_IWUSR, sdebug_removable_show,
3221             sdebug_removable_store);
3222
3223
3224 /* Note: The following function creates attribute files in the
3225    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
3226    files (over those found in the /sys/module/scsi_debug/parameters
3227    directory) is that auxiliary actions can be triggered when an attribute
3228    is changed. For example see: sdebug_add_host_store() above.
3229  */
3230 static int do_create_driverfs_files(void)
3231 {
3232         int ret;
3233
3234         ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3235         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
3236         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3237         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3238         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3239         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3240         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3241         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3242         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3243         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3244         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3245         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3246         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3247         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
3248         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_removable);
3249         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3250         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3251         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3252         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3253         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
3254         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
3255         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
3256         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
3257         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
3258         return ret;
3259 }
3260
3261 static void do_remove_driverfs_files(void)
3262 {
3263         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
3264         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
3265         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
3266         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
3267         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
3268         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3269         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3270         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3271         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3272         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
3273         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3274         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_removable);
3275         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3276         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3277         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3278         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3279         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3280         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3281         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3282         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3283         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3284         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3285         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
3286         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3287 }
3288
3289 struct device *pseudo_primary;
3290
3291 static int __init scsi_debug_init(void)
3292 {
3293         unsigned long sz;
3294         int host_to_add;
3295         int k;
3296         int ret;
3297
3298         switch (scsi_debug_sector_size) {
3299         case  512:
3300         case 1024:
3301         case 2048:
3302         case 4096:
3303                 break;
3304         default:
3305                 printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
3306                        scsi_debug_sector_size);
3307                 return -EINVAL;
3308         }
3309
3310         switch (scsi_debug_dif) {
3311
3312         case SD_DIF_TYPE0_PROTECTION:
3313         case SD_DIF_TYPE1_PROTECTION:
3314         case SD_DIF_TYPE2_PROTECTION:
3315         case SD_DIF_TYPE3_PROTECTION:
3316                 break;
3317
3318         default:
3319                 printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
3320                 return -EINVAL;
3321         }
3322
3323         if (scsi_debug_guard > 1) {
3324                 printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
3325                 return -EINVAL;
3326         }
3327
3328         if (scsi_debug_ato > 1) {
3329                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
3330                 return -EINVAL;
3331         }
3332
3333         if (scsi_debug_physblk_exp > 15) {
3334                 printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
3335                        scsi_debug_physblk_exp);
3336                 return -EINVAL;
3337         }
3338
3339         if (scsi_debug_lowest_aligned > 0x3fff) {
3340                 printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
3341                        scsi_debug_lowest_aligned);
3342                 return -EINVAL;
3343         }
3344
3345         if (scsi_debug_dev_size_mb < 1)
3346                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
3347         sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
3348         sdebug_store_sectors = sz / scsi_debug_sector_size;
3349         sdebug_capacity = get_sdebug_capacity();
3350
3351         /* play around with geometry, don't waste too much on track 0 */
3352         sdebug_heads = 8;
3353         sdebug_sectors_per = 32;
3354         if (scsi_debug_dev_size_mb >= 16)
3355                 sdebug_heads = 32;
3356         else if (scsi_debug_dev_size_mb >= 256)
3357                 sdebug_heads = 64;
3358         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3359                                (sdebug_sectors_per * sdebug_heads);
3360         if (sdebug_cylinders_per >= 1024) {
3361                 /* other LLDs do this; implies >= 1GB ram disk ... */
3362                 sdebug_heads = 255;
3363                 sdebug_sectors_per = 63;
3364                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3365                                (sdebug_sectors_per * sdebug_heads);
3366         }
3367
3368         fake_storep = vmalloc(sz);
3369         if (NULL == fake_storep) {
3370                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
3371                 return -ENOMEM;
3372         }
3373         memset(fake_storep, 0, sz);
3374         if (scsi_debug_num_parts > 0)
3375                 sdebug_build_parts(fake_storep, sz);
3376
3377         if (scsi_debug_dif) {
3378                 int dif_size;
3379
3380                 dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
3381                 dif_storep = vmalloc(dif_size);
3382
3383                 printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
3384                        dif_size, dif_storep);
3385
3386                 if (dif_storep == NULL) {
3387                         printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
3388                         ret = -ENOMEM;
3389                         goto free_vm;
3390                 }
3391
3392                 memset(dif_storep, 0xff, dif_size);
3393         }
3394
3395         /* Logical Block Provisioning */
3396         if (scsi_debug_lbp()) {
3397                 scsi_debug_unmap_max_blocks =
3398                         clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
3399
3400                 scsi_debug_unmap_max_desc =
3401                         clamp(scsi_debug_unmap_max_desc, 0U, 256U);
3402
3403                 scsi_debug_unmap_granularity =
3404                         clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
3405
3406                 if (scsi_debug_unmap_alignment &&
3407                     scsi_debug_unmap_granularity <=
3408                     scsi_debug_unmap_alignment) {
3409                         printk(KERN_ERR
3410                                "%s: ERR: unmap_granularity <= unmap_alignment\n",
3411                                __func__);
3412                         return -EINVAL;
3413                 }
3414
3415                 map_size = lba_to_map_index(sdebug_store_sectors - 1) + 1;
3416                 map_storep = vmalloc(BITS_TO_LONGS(map_size) * sizeof(long));
3417
3418                 printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
3419                        map_size);
3420
3421                 if (map_storep == NULL) {
3422                         printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
3423                         ret = -ENOMEM;
3424                         goto free_vm;
3425                 }
3426
3427                 bitmap_zero(map_storep, map_size);
3428
3429                 /* Map first 1KB for partition table */
3430                 if (scsi_debug_num_parts)
3431                         map_region(0, 2);
3432         }
3433
3434         pseudo_primary = root_device_register("pseudo_0");
3435         if (IS_ERR(pseudo_primary)) {
3436                 printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
3437                 ret = PTR_ERR(pseudo_primary);
3438                 goto free_vm;
3439         }
3440         ret = bus_register(&pseudo_lld_bus);
3441         if (ret < 0) {
3442                 printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
3443                         ret);
3444                 goto dev_unreg;
3445         }
3446         ret = driver_register(&sdebug_driverfs_driver);
3447         if (ret < 0) {
3448                 printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
3449                         ret);
3450                 goto bus_unreg;
3451         }
3452         ret = do_create_driverfs_files();
3453         if (ret < 0) {
3454                 printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
3455                         ret);
3456                 goto del_files;
3457         }
3458
3459         init_all_queued();
3460
3461         host_to_add = scsi_debug_add_host;
3462         scsi_debug_add_host = 0;
3463
3464         for (k = 0; k < host_to_add; k++) {
3465                 if (sdebug_add_adapter()) {
3466                         printk(KERN_ERR "scsi_debug_init: "
3467                                "sdebug_add_adapter failed k=%d\n", k);
3468                         break;
3469                 }
3470         }
3471
3472         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
3473                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
3474                        scsi_debug_add_host);
3475         }
3476         return 0;
3477
3478 del_files:
3479         do_remove_driverfs_files();
3480         driver_unregister(&sdebug_driverfs_driver);
3481 bus_unreg:
3482         bus_unregister(&pseudo_lld_bus);
3483 dev_unreg:
3484         root_device_unregister(pseudo_primary);
3485 free_vm:
3486         if (map_storep)
3487                 vfree(map_storep);
3488         if (dif_storep)
3489                 vfree(dif_storep);
3490         vfree(fake_storep);
3491
3492         return ret;
3493 }
3494
3495 static void __exit scsi_debug_exit(void)
3496 {
3497         int k = scsi_debug_add_host;
3498
3499         stop_all_queued();
3500         for (; k; k--)
3501                 sdebug_remove_adapter();
3502         do_remove_driverfs_files();
3503         driver_unregister(&sdebug_driverfs_driver);
3504         bus_unregister(&pseudo_lld_bus);
3505         root_device_unregister(pseudo_primary);
3506
3507         if (dif_storep)
3508                 vfree(dif_storep);
3509
3510         vfree(fake_storep);
3511 }
3512
3513 device_initcall(scsi_debug_init);
3514 module_exit(scsi_debug_exit);
3515
3516 static void sdebug_release_adapter(struct device * dev)
3517 {
3518         struct sdebug_host_info *sdbg_host;
3519
3520         sdbg_host = to_sdebug_host(dev);
3521         kfree(sdbg_host);
3522 }
3523
3524 static int sdebug_add_adapter(void)
3525 {
3526         int k, devs_per_host;
3527         int error = 0;
3528         struct sdebug_host_info *sdbg_host;
3529         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3530
3531         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
3532         if (NULL == sdbg_host) {
3533                 printk(KERN_ERR "%s: out of memory at line %d\n",
3534                        __func__, __LINE__);
3535                 return -ENOMEM;
3536         }
3537
3538         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
3539
3540         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
3541         for (k = 0; k < devs_per_host; k++) {
3542                 sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
3543                 if (!sdbg_devinfo) {
3544                         printk(KERN_ERR "%s: out of memory at line %d\n",
3545                                __func__, __LINE__);
3546                         error = -ENOMEM;
3547                         goto clean;
3548                 }
3549         }
3550
3551         spin_lock(&sdebug_host_list_lock);
3552         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
3553         spin_unlock(&sdebug_host_list_lock);
3554
3555         sdbg_host->dev.bus = &pseudo_lld_bus;
3556         sdbg_host->dev.parent = pseudo_primary;
3557         sdbg_host->dev.release = &sdebug_release_adapter;
3558         dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
3559
3560         error = device_register(&sdbg_host->dev);
3561
3562         if (error)
3563                 goto clean;
3564
3565         ++scsi_debug_add_host;
3566         return error;
3567
3568 clean:
3569         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
3570                                  dev_list) {
3571                 list_del(&sdbg_devinfo->dev_list);
3572                 kfree(sdbg_devinfo);
3573         }
3574
3575         kfree(sdbg_host);
3576         return error;
3577 }
3578
3579 static void sdebug_remove_adapter(void)
3580 {
3581         struct sdebug_host_info * sdbg_host = NULL;
3582
3583         spin_lock(&sdebug_host_list_lock);
3584         if (!list_empty(&sdebug_host_list)) {
3585                 sdbg_host = list_entry(sdebug_host_list.prev,
3586                                        struct sdebug_host_info, host_list);
3587                 list_del(&sdbg_host->host_list);
3588         }
3589         spin_unlock(&sdebug_host_list_lock);
3590
3591         if (!sdbg_host)
3592                 return;
3593
3594         device_unregister(&sdbg_host->dev);
3595         --scsi_debug_add_host;
3596 }
3597
3598 static
3599 int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
3600 {
3601         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
3602         int len, k;
3603         unsigned int num;
3604         unsigned long long lba;
3605         u32 ei_lba;
3606         int errsts = 0;
3607         int target = SCpnt->device->id;
3608         struct sdebug_dev_info *devip = NULL;
3609         int inj_recovered = 0;
3610         int inj_transport = 0;
3611         int inj_dif = 0;
3612         int inj_dix = 0;
3613         int delay_override = 0;
3614         int unmap = 0;
3615
3616         scsi_set_resid(SCpnt, 0);
3617         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
3618                 printk(KERN_INFO "scsi_debug: cmd ");
3619                 for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
3620                         printk("%02x ", (int)cmd[k]);
3621                 printk("\n");
3622         }
3623
3624         if (target == SCpnt->device->host->hostt->this_id) {
3625                 printk(KERN_INFO "scsi_debug: initiator's id used as "
3626                        "target!\n");
3627                 return schedule_resp(SCpnt, NULL, done,
3628                                      DID_NO_CONNECT << 16, 0);
3629         }
3630
3631         if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
3632             (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
3633                 return schedule_resp(SCpnt, NULL, done,
3634                                      DID_NO_CONNECT << 16, 0);
3635         devip = devInfoReg(SCpnt->device);
3636         if (NULL == devip)
3637                 return schedule_resp(SCpnt, NULL, done,
3638                                      DID_NO_CONNECT << 16, 0);
3639
3640         if ((scsi_debug_every_nth != 0) &&
3641             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
3642                 scsi_debug_cmnd_count = 0;
3643                 if (scsi_debug_every_nth < -1)
3644                         scsi_debug_every_nth = -1;
3645                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
3646                         return 0; /* ignore command causing timeout */
3647                 else if (SCSI_DEBUG_OPT_MAC_TIMEOUT & scsi_debug_opts &&
3648                          scsi_medium_access_command(SCpnt))
3649                         return 0; /* time out reads and writes */
3650                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
3651                         inj_recovered = 1; /* to reads and writes below */
3652                 else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
3653                         inj_transport = 1; /* to reads and writes below */
3654                 else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
3655                         inj_dif = 1; /* to reads and writes below */
3656                 else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
3657                         inj_dix = 1; /* to reads and writes below */
3658         }
3659
3660         if (devip->wlun) {
3661                 switch (*cmd) {
3662                 case INQUIRY:
3663                 case REQUEST_SENSE:
3664                 case TEST_UNIT_READY:
3665                 case REPORT_LUNS:
3666                         break;  /* only allowable wlun commands */
3667                 default:
3668                         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3669                                 printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
3670                                        "not supported for wlun\n", *cmd);
3671                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3672                                         INVALID_OPCODE, 0);
3673                         errsts = check_condition_result;
3674                         return schedule_resp(SCpnt, devip, done, errsts,
3675                                              0);
3676                 }
3677         }
3678
3679         switch (*cmd) {
3680         case INQUIRY:     /* mandatory, ignore unit attention */
3681                 delay_override = 1;
3682                 errsts = resp_inquiry(SCpnt, target, devip);
3683                 break;
3684         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
3685                 delay_override = 1;
3686                 errsts = resp_requests(SCpnt, devip);
3687                 break;
3688         case REZERO_UNIT:       /* actually this is REWIND for SSC */
3689         case START_STOP:
3690                 errsts = resp_start_stop(SCpnt, devip);
3691                 break;
3692         case ALLOW_MEDIUM_REMOVAL:
3693                 errsts = check_readiness(SCpnt, 1, devip);
3694                 if (errsts)
3695                         break;
3696                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3697                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
3698                                cmd[4] ? "inhibited" : "enabled");
3699                 break;
3700         case SEND_DIAGNOSTIC:     /* mandatory */
3701                 errsts = check_readiness(SCpnt, 1, devip);
3702                 break;
3703         case TEST_UNIT_READY:     /* mandatory */
3704                 delay_override = 1;
3705                 errsts = check_readiness(SCpnt, 0, devip);
3706                 break;
3707         case RESERVE:
3708                 errsts = check_readiness(SCpnt, 1, devip);
3709                 break;
3710         case RESERVE_10:
3711                 errsts = check_readiness(SCpnt, 1, devip);
3712                 break;
3713         case RELEASE:
3714                 errsts = check_readiness(SCpnt, 1, devip);
3715                 break;
3716         case RELEASE_10:
3717                 errsts = check_readiness(SCpnt, 1, devip);
3718                 break;
3719         case READ_CAPACITY:
3720                 errsts = resp_readcap(SCpnt, devip);
3721                 break;
3722         case SERVICE_ACTION_IN:
3723                 if (cmd[1] == SAI_READ_CAPACITY_16)
3724                         errsts = resp_readcap16(SCpnt, devip);
3725                 else if (cmd[1] == SAI_GET_LBA_STATUS) {
3726
3727                         if (scsi_debug_lbp() == 0) {
3728                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3729                                                 INVALID_COMMAND_OPCODE, 0);
3730                                 errsts = check_condition_result;
3731                         } else
3732                                 errsts = resp_get_lba_status(SCpnt, devip);
3733                 } else {
3734                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3735                                         INVALID_OPCODE, 0);
3736                         errsts = check_condition_result;
3737                 }
3738                 break;
3739         case MAINTENANCE_IN:
3740                 if (MI_REPORT_TARGET_PGS != cmd[1]) {
3741                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3742                                         INVALID_OPCODE, 0);
3743                         errsts = check_condition_result;
3744                         break;
3745                 }
3746                 errsts = resp_report_tgtpgs(SCpnt, devip);
3747                 break;
3748         case READ_16:
3749         case READ_12:
3750         case READ_10:
3751                 /* READ{10,12,16} and DIF Type 2 are natural enemies */
3752                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3753                     cmd[1] & 0xe0) {
3754                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3755                                         INVALID_COMMAND_OPCODE, 0);
3756                         errsts = check_condition_result;
3757                         break;
3758                 }
3759
3760                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3761                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3762                     (cmd[1] & 0xe0) == 0)
3763                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3764
3765                 /* fall through */
3766         case READ_6:
3767 read:
3768                 errsts = check_readiness(SCpnt, 0, devip);
3769                 if (errsts)
3770                         break;
3771                 if (scsi_debug_fake_rw)
3772                         break;
3773                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3774                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3775                 if (inj_recovered && (0 == errsts)) {
3776                         mk_sense_buffer(devip, RECOVERED_ERROR,
3777                                         THRESHOLD_EXCEEDED, 0);
3778                         errsts = check_condition_result;
3779                 } else if (inj_transport && (0 == errsts)) {
3780                         mk_sense_buffer(devip, ABORTED_COMMAND,
3781                                         TRANSPORT_PROBLEM, ACK_NAK_TO);
3782                         errsts = check_condition_result;
3783                 } else if (inj_dif && (0 == errsts)) {
3784                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3785                         errsts = illegal_condition_result;
3786                 } else if (inj_dix && (0 == errsts)) {
3787                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3788                         errsts = illegal_condition_result;
3789                 }
3790                 break;
3791         case REPORT_LUNS:       /* mandatory, ignore unit attention */
3792                 delay_override = 1;
3793                 errsts = resp_report_luns(SCpnt, devip);
3794                 break;
3795         case VERIFY:            /* 10 byte SBC-2 command */
3796                 errsts = check_readiness(SCpnt, 0, devip);
3797                 break;
3798         case WRITE_16:
3799         case WRITE_12:
3800         case WRITE_10:
3801                 /* WRITE{10,12,16} and DIF Type 2 are natural enemies */
3802                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3803                     cmd[1] & 0xe0) {
3804                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3805                                         INVALID_COMMAND_OPCODE, 0);
3806                         errsts = check_condition_result;
3807                         break;
3808                 }
3809
3810                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3811                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3812                     (cmd[1] & 0xe0) == 0)
3813                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3814
3815                 /* fall through */
3816         case WRITE_6:
3817 write:
3818                 errsts = check_readiness(SCpnt, 0, devip);
3819                 if (errsts)
3820                         break;
3821                 if (scsi_debug_fake_rw)
3822                         break;
3823                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3824                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3825                 if (inj_recovered && (0 == errsts)) {
3826                         mk_sense_buffer(devip, RECOVERED_ERROR,
3827                                         THRESHOLD_EXCEEDED, 0);
3828                         errsts = check_condition_result;
3829                 } else if (inj_dif && (0 == errsts)) {
3830                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3831                         errsts = illegal_condition_result;
3832                 } else if (inj_dix && (0 == errsts)) {
3833                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3834                         errsts = illegal_condition_result;
3835                 }
3836                 break;
3837         case WRITE_SAME_16:
3838         case WRITE_SAME:
3839                 if (cmd[1] & 0x8) {
3840                         if ((*cmd == WRITE_SAME_16 && scsi_debug_lbpws == 0) ||
3841                             (*cmd == WRITE_SAME && scsi_debug_lbpws10 == 0)) {
3842                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3843                                                 INVALID_FIELD_IN_CDB, 0);
3844                                 errsts = check_condition_result;
3845                         } else
3846                                 unmap = 1;
3847                 }
3848                 if (errsts)
3849                         break;
3850                 errsts = check_readiness(SCpnt, 0, devip);
3851                 if (errsts)
3852                         break;
3853                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3854                 errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
3855                 break;
3856         case UNMAP:
3857                 errsts = check_readiness(SCpnt, 0, devip);
3858                 if (errsts)
3859                         break;
3860
3861                 if (scsi_debug_unmap_max_desc == 0 || scsi_debug_lbpu == 0) {
3862                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3863                                         INVALID_COMMAND_OPCODE, 0);
3864                         errsts = check_condition_result;
3865                 } else
3866                         errsts = resp_unmap(SCpnt, devip);
3867                 break;
3868         case MODE_SENSE:
3869         case MODE_SENSE_10:
3870                 errsts = resp_mode_sense(SCpnt, target, devip);
3871                 break;
3872         case MODE_SELECT:
3873                 errsts = resp_mode_select(SCpnt, 1, devip);
3874                 break;
3875         case MODE_SELECT_10:
3876                 errsts = resp_mode_select(SCpnt, 0, devip);
3877                 break;
3878         case LOG_SENSE:
3879                 errsts = resp_log_sense(SCpnt, devip);
3880                 break;
3881         case SYNCHRONIZE_CACHE:
3882                 delay_override = 1;
3883                 errsts = check_readiness(SCpnt, 0, devip);
3884                 break;
3885         case WRITE_BUFFER:
3886                 errsts = check_readiness(SCpnt, 1, devip);
3887                 break;
3888         case XDWRITEREAD_10:
3889                 if (!scsi_bidi_cmnd(SCpnt)) {
3890                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3891                                         INVALID_FIELD_IN_CDB, 0);
3892                         errsts = check_condition_result;
3893                         break;
3894                 }
3895
3896                 errsts = check_readiness(SCpnt, 0, devip);
3897                 if (errsts)
3898                         break;
3899                 if (scsi_debug_fake_rw)
3900                         break;
3901                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3902                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3903                 if (errsts)
3904                         break;
3905                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3906                 if (errsts)
3907                         break;
3908                 errsts = resp_xdwriteread(SCpnt, lba, num, devip);
3909                 break;
3910         case VARIABLE_LENGTH_CMD:
3911                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
3912
3913                         if ((cmd[10] & 0xe0) == 0)
3914                                 printk(KERN_ERR
3915                                        "Unprotected RD/WR to DIF device\n");
3916
3917                         if (cmd[9] == READ_32) {
3918                                 BUG_ON(SCpnt->cmd_len < 32);
3919                                 goto read;
3920                         }
3921
3922                         if (cmd[9] == WRITE_32) {
3923                                 BUG_ON(SCpnt->cmd_len < 32);
3924                                 goto write;
3925                         }
3926                 }
3927
3928                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3929                                 INVALID_FIELD_IN_CDB, 0);
3930                 errsts = check_condition_result;
3931                 break;
3932
3933         default:
3934                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3935                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
3936                                "supported\n", *cmd);
3937                 errsts = check_readiness(SCpnt, 1, devip);
3938                 if (errsts)
3939                         break;  /* Unit attention takes precedence */
3940                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
3941                 errsts = check_condition_result;
3942                 break;
3943         }
3944         return schedule_resp(SCpnt, devip, done, errsts,
3945                              (delay_override ? 0 : scsi_debug_delay));
3946 }
3947
3948 static DEF_SCSI_QCMD(scsi_debug_queuecommand)
3949
3950 static struct scsi_host_template sdebug_driver_template = {
3951         .show_info =            scsi_debug_show_info,
3952         .write_info =           scsi_debug_write_info,
3953         .proc_name =            sdebug_proc_name,
3954         .name =                 "SCSI DEBUG",
3955         .info =                 scsi_debug_info,
3956         .slave_alloc =          scsi_debug_slave_alloc,
3957         .slave_configure =      scsi_debug_slave_configure,
3958         .slave_destroy =        scsi_debug_slave_destroy,
3959         .ioctl =                scsi_debug_ioctl,
3960         .queuecommand =         scsi_debug_queuecommand,
3961         .eh_abort_handler =     scsi_debug_abort,
3962         .eh_bus_reset_handler = scsi_debug_bus_reset,
3963         .eh_device_reset_handler = scsi_debug_device_reset,
3964         .eh_host_reset_handler = scsi_debug_host_reset,
3965         .bios_param =           scsi_debug_biosparam,
3966         .can_queue =            SCSI_DEBUG_CANQUEUE,
3967         .this_id =              7,
3968         .sg_tablesize =         256,
3969         .cmd_per_lun =          16,
3970         .max_sectors =          0xffff,
3971         .use_clustering =       DISABLE_CLUSTERING,
3972         .module =               THIS_MODULE,
3973 };
3974
3975 static int sdebug_driver_probe(struct device * dev)
3976 {
3977         int error = 0;
3978         struct sdebug_host_info *sdbg_host;
3979         struct Scsi_Host *hpnt;
3980         int host_prot;
3981
3982         sdbg_host = to_sdebug_host(dev);
3983
3984         sdebug_driver_template.can_queue = scsi_debug_max_queue;
3985         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
3986         if (NULL == hpnt) {
3987                 printk(KERN_ERR "%s: scsi_register failed\n", __func__);
3988                 error = -ENODEV;
3989                 return error;
3990         }
3991
3992         sdbg_host->shost = hpnt;
3993         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
3994         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
3995                 hpnt->max_id = scsi_debug_num_tgts + 1;
3996         else
3997                 hpnt->max_id = scsi_debug_num_tgts;
3998         hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;  /* = scsi_debug_max_luns; */
3999
4000         host_prot = 0;
4001
4002         switch (scsi_debug_dif) {
4003
4004         case SD_DIF_TYPE1_PROTECTION:
4005                 host_prot = SHOST_DIF_TYPE1_PROTECTION;
4006                 if (scsi_debug_dix)
4007                         host_prot |= SHOST_DIX_TYPE1_PROTECTION;
4008                 break;
4009
4010         case SD_DIF_TYPE2_PROTECTION:
4011                 host_prot = SHOST_DIF_TYPE2_PROTECTION;
4012                 if (scsi_debug_dix)
4013                         host_prot |= SHOST_DIX_TYPE2_PROTECTION;
4014                 break;
4015
4016         case SD_DIF_TYPE3_PROTECTION:
4017                 host_prot = SHOST_DIF_TYPE3_PROTECTION;
4018                 if (scsi_debug_dix)
4019                         host_prot |= SHOST_DIX_TYPE3_PROTECTION;
4020                 break;
4021
4022         default:
4023                 if (scsi_debug_dix)
4024                         host_prot |= SHOST_DIX_TYPE0_PROTECTION;
4025                 break;
4026         }
4027
4028         scsi_host_set_prot(hpnt, host_prot);
4029
4030         printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
4031                (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
4032                (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
4033                (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
4034                (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
4035                (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
4036                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
4037                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
4038
4039         if (scsi_debug_guard == 1)
4040                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
4041         else
4042                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
4043
4044         error = scsi_add_host(hpnt, &sdbg_host->dev);
4045         if (error) {
4046                 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
4047                 error = -ENODEV;
4048                 scsi_host_put(hpnt);
4049         } else
4050                 scsi_scan_host(hpnt);
4051
4052
4053         return error;
4054 }
4055
4056 static int sdebug_driver_remove(struct device * dev)
4057 {
4058         struct sdebug_host_info *sdbg_host;
4059         struct sdebug_dev_info *sdbg_devinfo, *tmp;
4060
4061         sdbg_host = to_sdebug_host(dev);
4062
4063         if (!sdbg_host) {
4064                 printk(KERN_ERR "%s: Unable to locate host info\n",
4065                        __func__);
4066                 return -ENODEV;
4067         }
4068
4069         scsi_remove_host(sdbg_host->shost);
4070
4071         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
4072                                  dev_list) {
4073                 list_del(&sdbg_devinfo->dev_list);
4074                 kfree(sdbg_devinfo);
4075         }
4076
4077         scsi_host_put(sdbg_host->shost);
4078         return 0;
4079 }
4080
4081 static int pseudo_lld_bus_match(struct device *dev,
4082                                 struct device_driver *dev_driver)
4083 {
4084         return 1;
4085 }
4086
4087 static struct bus_type pseudo_lld_bus = {
4088         .name = "pseudo",
4089         .match = pseudo_lld_bus_match,
4090         .probe = sdebug_driver_probe,
4091         .remove = sdebug_driver_remove,
4092 };