drivers/scsi/scsi_debug.c

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