Pileus Git - ~andy/linux/blob - drivers/scsi/scsi_debug.c

   1 /*
   2  * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
   3  *  Copyright (C) 1992  Eric Youngdale
   4  *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
   5  *  to make sure that we are not getting blocks mixed up, and PANIC if
   6  *  anything out of the ordinary is seen.
   7  * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   8  *
   9  *  This version is more generic, simulating a variable number of disk
  10  *  (or disk like devices) sharing a common amount of RAM. To be more
  11  *  realistic, the simulated devices have the transport attributes of
  12  *  SAS disks.
  13  *
  14  *
  15  *  For documentation see http://sg.danny.cz/sg/sdebug26.html
  16  *
  17  *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
  18  *   dpg: work for devfs large number of disks [20010809]
  19  *        forked for lk 2.5 series [20011216, 20020101]
  20  *        use vmalloc() more inquiry+mode_sense [20020302]
  21  *        add timers for delayed responses [20020721]
  22  *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
  23  *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
  24  *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
  25  *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
  26  */
  27
  28 #include <linux/module.h>
  29
  30 #include <linux/kernel.h>
  31 #include <linux/errno.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/genhd.h>
  37 #include <linux/fs.h>
  38 #include <linux/init.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/scatterlist.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/crc-t10dif.h>
  45
  46 #include <net/checksum.h>
  47
  48 #include <asm/unaligned.h>
  49
  50 #include <scsi/scsi.h>
  51 #include <scsi/scsi_cmnd.h>
  52 #include <scsi/scsi_device.h>
  53 #include <scsi/scsi_host.h>
  54 #include <scsi/scsicam.h>
  55 #include <scsi/scsi_eh.h>
  56 #include <scsi/scsi_dbg.h>
  57
  58 #include "sd.h"
  59 #include "scsi_logging.h"
  60
  61 #define SCSI_DEBUG_VERSION "1.82"
  62 static const char * scsi_debug_version_date = "20100324";
  63
  64 /* Additional Sense Code (ASC) */
  65 #define NO_ADDITIONAL_SENSE 0x0
  66 #define LOGICAL_UNIT_NOT_READY 0x4
  67 #define UNRECOVERED_READ_ERR 0x11
  68 #define PARAMETER_LIST_LENGTH_ERR 0x1a
  69 #define INVALID_OPCODE 0x20
  70 #define ADDR_OUT_OF_RANGE 0x21
  71 #define INVALID_COMMAND_OPCODE 0x20
  72 #define INVALID_FIELD_IN_CDB 0x24
  73 #define INVALID_FIELD_IN_PARAM_LIST 0x26
  74 #define POWERON_RESET 0x29
  75 #define SAVING_PARAMS_UNSUP 0x39
  76 #define TRANSPORT_PROBLEM 0x4b
  77 #define THRESHOLD_EXCEEDED 0x5d
  78 #define LOW_POWER_COND_ON 0x5e
  79
  80 /* Additional Sense Code Qualifier (ASCQ) */
  81 #define ACK_NAK_TO 0x3
  82
  83 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
  84
  85 /* Default values for driver parameters */
  86 #define DEF_NUM_HOST   1
  87 #define DEF_NUM_TGTS   1
  88 #define DEF_MAX_LUNS   1
  89 /* With these defaults, this driver will make 1 host with 1 target
  90  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  91  */
  92 #define DEF_ATO 1
  93 #define DEF_DELAY   1
  94 #define DEF_DEV_SIZE_MB   8
  95 #define DEF_DIF 0
  96 #define DEF_DIX 0
  97 #define DEF_D_SENSE   0
  98 #define DEF_EVERY_NTH   0
  99 #define DEF_FAKE_RW     0
 100 #define DEF_GUARD 0
 101 #define DEF_LBPU 0
 102 #define DEF_LBPWS 0
 103 #define DEF_LBPWS10 0
 104 #define DEF_LBPRZ 1
 105 #define DEF_LOWEST_ALIGNED 0
 106 #define DEF_NO_LUN_0   0
 107 #define DEF_NUM_PARTS   0
 108 #define DEF_OPTS   0
 109 #define DEF_OPT_BLKS 64
 110 #define DEF_PHYSBLK_EXP 0
 111 #define DEF_PTYPE   0
 112 #define DEF_REMOVABLE false
 113 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
 114 #define DEF_SECTOR_SIZE 512
 115 #define DEF_UNMAP_ALIGNMENT 0
 116 #define DEF_UNMAP_GRANULARITY 1
 117 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
 118 #define DEF_UNMAP_MAX_DESC 256
 119 #define DEF_VIRTUAL_GB   0
 120 #define DEF_VPD_USE_HOSTNO 1
 121 #define DEF_WRITESAME_LENGTH 0xFFFF
 122
 123 /* bit mask values for scsi_debug_opts */
 124 #define SCSI_DEBUG_OPT_NOISE   1
 125 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
 126 #define SCSI_DEBUG_OPT_TIMEOUT   4
 127 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
 128 #define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
 129 #define SCSI_DEBUG_OPT_DIF_ERR   32
 130 #define SCSI_DEBUG_OPT_DIX_ERR   64
 131 #define SCSI_DEBUG_OPT_MAC_TIMEOUT  128
 132 /* When "every_nth" > 0 then modulo "every_nth" commands:
 133  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
 134  *   - a RECOVERED_ERROR is simulated on successful read and write
 135  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
 136  *   - a TRANSPORT_ERROR is simulated on successful read and write
 137  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
 138  *
 139  * When "every_nth" < 0 then after "- every_nth" commands:
 140  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
 141  *   - a RECOVERED_ERROR is simulated on successful read and write
 142  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
 143  *   - a TRANSPORT_ERROR is simulated on successful read and write
 144  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
 145  * This will continue until some other action occurs (e.g. the user
 146  * writing a new value (other than -1 or 1) to every_nth via sysfs).
 147  */
 148
 149 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
 150  * sector on read commands: */
 151 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
 152 #define OPT_MEDIUM_ERR_NUM    10     /* number of consecutive medium errs */
 153
 154 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
 155  * or "peripheral device" addressing (value 0) */
 156 #define SAM2_LUN_ADDRESS_METHOD 0
 157 #define SAM2_WLUN_REPORT_LUNS 0xc101
 158
 159 /* Can queue up to this number of commands. Typically commands that
 160  * that have a non-zero delay are queued. */
 161 #define SCSI_DEBUG_CANQUEUE  255
 162
 163 static int scsi_debug_add_host = DEF_NUM_HOST;
 164 static int scsi_debug_ato = DEF_ATO;
 165 static int scsi_debug_delay = DEF_DELAY;
 166 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
 167 static int scsi_debug_dif = DEF_DIF;
 168 static int scsi_debug_dix = DEF_DIX;
 169 static int scsi_debug_dsense = DEF_D_SENSE;
 170 static int scsi_debug_every_nth = DEF_EVERY_NTH;
 171 static int scsi_debug_fake_rw = DEF_FAKE_RW;
 172 static int scsi_debug_guard = DEF_GUARD;
 173 static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
 174 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 175 static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
 176 static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
 177 static int scsi_debug_no_uld = 0;
 178 static int scsi_debug_num_parts = DEF_NUM_PARTS;
 179 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
 180 static int scsi_debug_opt_blks = DEF_OPT_BLKS;
 181 static int scsi_debug_opts = DEF_OPTS;
 182 static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
 183 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
 184 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
 185 static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
 186 static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
 187 static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
 188 static unsigned int scsi_debug_lbpu = DEF_LBPU;
 189 static unsigned int scsi_debug_lbpws = DEF_LBPWS;
 190 static unsigned int scsi_debug_lbpws10 = DEF_LBPWS10;
 191 static unsigned int scsi_debug_lbprz = DEF_LBPRZ;
 192 static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
 193 static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
 194 static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
 195 static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
 196 static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH;
 197 static bool scsi_debug_removable = DEF_REMOVABLE;
 198
 199 static int scsi_debug_cmnd_count = 0;
 200
 201 #define DEV_READONLY(TGT)      (0)
 202
 203 static unsigned int sdebug_store_sectors;
 204 static sector_t sdebug_capacity;        /* in sectors */
 205
 206 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
 207    may still need them */
 208 static int sdebug_heads;                /* heads per disk */
 209 static int sdebug_cylinders_per;        /* cylinders per surface */
 210 static int sdebug_sectors_per;          /* sectors per cylinder */
 211
 212 #define SDEBUG_MAX_PARTS 4
 213
 214 #define SDEBUG_SENSE_LEN 32
 215
 216 #define SCSI_DEBUG_MAX_CMD_LEN 32
 217
 218 static unsigned int scsi_debug_lbp(void)
 219 {
 220         return scsi_debug_lbpu | scsi_debug_lbpws | scsi_debug_lbpws10;
 221 }
 222
 223 struct sdebug_dev_info {
 224         struct list_head dev_list;
 225         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
 226         unsigned int channel;
 227         unsigned int target;
 228         unsigned int lun;
 229         struct sdebug_host_info *sdbg_host;
 230         unsigned int wlun;
 231         char reset;
 232         char stopped;
 233         char used;
 234 };
 235
 236 struct sdebug_host_info {
 237         struct list_head host_list;
 238         struct Scsi_Host *shost;
 239         struct device dev;
 240         struct list_head dev_info_list;
 241 };
 242
 243 #define to_sdebug_host(d)       \
 244         container_of(d, struct sdebug_host_info, dev)
 245
 246 static LIST_HEAD(sdebug_host_list);
 247 static DEFINE_SPINLOCK(sdebug_host_list_lock);
 248
 249 typedef void (* done_funct_t) (struct scsi_cmnd *);
 250
 251 struct sdebug_queued_cmd {
 252         int in_use;
 253         struct timer_list cmnd_timer;
 254         done_funct_t done_funct;
 255         struct scsi_cmnd * a_cmnd;
 256         int scsi_result;
 257 };
 258 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 259
 260 static unsigned char * fake_storep;     /* ramdisk storage */
 261 static unsigned char *dif_storep;       /* protection info */
 262 static void *map_storep;                /* provisioning map */
 263
 264 static unsigned long map_size;
 265 static int num_aborts = 0;
 266 static int num_dev_resets = 0;
 267 static int num_bus_resets = 0;
 268 static int num_host_resets = 0;
 269 static int dix_writes;
 270 static int dix_reads;
 271 static int dif_errors;
 272
 273 static DEFINE_SPINLOCK(queued_arr_lock);
 274 static DEFINE_RWLOCK(atomic_rw);
 275
 276 static char sdebug_proc_name[] = "scsi_debug";
 277
 278 static struct bus_type pseudo_lld_bus;
 279
 280 static inline sector_t dif_offset(sector_t sector)
 281 {
 282         return sector << 3;
 283 }
 284
 285 static struct device_driver sdebug_driverfs_driver = {
 286         .name           = sdebug_proc_name,
 287         .bus            = &pseudo_lld_bus,
 288 };
 289
 290 static const int check_condition_result =
 291                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 292
 293 static const int illegal_condition_result =
 294         (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
 295
 296 static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 297                                     0, 0, 0x2, 0x4b};
 298 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 299                                    0, 0, 0x0, 0x0};
 300
 301 static int sdebug_add_adapter(void);
 302 static void sdebug_remove_adapter(void);
 303
 304 static void sdebug_max_tgts_luns(void)
 305 {
 306         struct sdebug_host_info *sdbg_host;
 307         struct Scsi_Host *hpnt;
 308
 309         spin_lock(&sdebug_host_list_lock);
 310         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
 311                 hpnt = sdbg_host->shost;
 312                 if ((hpnt->this_id >= 0) &&
 313                     (scsi_debug_num_tgts > hpnt->this_id))
 314                         hpnt->max_id = scsi_debug_num_tgts + 1;
 315                 else
 316                         hpnt->max_id = scsi_debug_num_tgts;
 317                 /* scsi_debug_max_luns; */
 318                 hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;
 319         }
 320         spin_unlock(&sdebug_host_list_lock);
 321 }
 322
 323 static void mk_sense_buffer(struct sdebug_dev_info *devip, int key,
 324                             int asc, int asq)
 325 {
 326         unsigned char *sbuff;
 327
 328         sbuff = devip->sense_buff;
 329         memset(sbuff, 0, SDEBUG_SENSE_LEN);
 330
 331         scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, asq);
 332
 333         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 334                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
 335                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
 336 }
 337
 338 static void get_data_transfer_info(unsigned char *cmd,
 339                                    unsigned long long *lba, unsigned int *num,
 340                                    u32 *ei_lba)
 341 {
 342         *ei_lba = 0;
 343
 344         switch (*cmd) {
 345         case VARIABLE_LENGTH_CMD:
 346                 *lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
 347                         (u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
 348                         (u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
 349                         (u64)cmd[13] << 48 | (u64)cmd[12] << 56;
 350
 351                 *ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
 352                         (u32)cmd[21] << 16 | (u32)cmd[20] << 24;
 353
 354                 *num = (u32)cmd[31] | (u32)cmd[30] << 8 | (u32)cmd[29] << 16 |
 355                         (u32)cmd[28] << 24;
 356                 break;
 357
 358         case WRITE_SAME_16:
 359         case WRITE_16:
 360         case READ_16:
 361                 *lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
 362                         (u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
 363                         (u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
 364                         (u64)cmd[3] << 48 | (u64)cmd[2] << 56;
 365
 366                 *num = (u32)cmd[13] | (u32)cmd[12] << 8 | (u32)cmd[11] << 16 |
 367                         (u32)cmd[10] << 24;
 368                 break;
 369         case WRITE_12:
 370         case READ_12:
 371                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
 372                         (u32)cmd[2] << 24;
 373
 374                 *num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7] << 16 |
 375                         (u32)cmd[6] << 24;
 376                 break;
 377         case WRITE_SAME:
 378         case WRITE_10:
 379         case READ_10:
 380         case XDWRITEREAD_10:
 381                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
 382                         (u32)cmd[2] << 24;
 383
 384                 *num = (u32)cmd[8] | (u32)cmd[7] << 8;
 385                 break;
 386         case WRITE_6:
 387         case READ_6:
 388                 *lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
 389                         (u32)(cmd[1] & 0x1f) << 16;
 390                 *num = (0 == cmd[4]) ? 256 : cmd[4];
 391                 break;
 392         default:
 393                 break;
 394         }
 395 }
 396
 397 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
 398 {
 399         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
 400                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
 401         }
 402         return -EINVAL;
 403         /* return -ENOTTY; // correct return but upsets fdisk */
 404 }
 405
 406 static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
 407                            struct sdebug_dev_info * devip)
 408 {
 409         if (devip->reset) {
 410                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 411                         printk(KERN_INFO "scsi_debug: Reporting Unit "
 412                                "attention: power on reset\n");
 413                 devip->reset = 0;
 414                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
 415                 return check_condition_result;
 416         }
 417         if ((0 == reset_only) && devip->stopped) {
 418                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 419                         printk(KERN_INFO "scsi_debug: Reporting Not "
 420                                "ready: initializing command required\n");
 421                 mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
 422                                 0x2);
 423                 return check_condition_result;
 424         }
 425         return 0;
 426 }
 427
 428 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
 429 static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
 430                                 int arr_len)
 431 {
 432         int act_len;
 433         struct scsi_data_buffer *sdb = scsi_in(scp);
 434
 435         if (!sdb->length)
 436                 return 0;
 437         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
 438                 return (DID_ERROR << 16);
 439
 440         act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
 441                                       arr, arr_len);
 442         if (sdb->resid)
 443                 sdb->resid -= act_len;
 444         else
 445                 sdb->resid = scsi_bufflen(scp) - act_len;
 446
 447         return 0;
 448 }
 449
 450 /* Returns number of bytes fetched into 'arr' or -1 if error. */
 451 static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
 452                                int arr_len)
 453 {
 454         if (!scsi_bufflen(scp))
 455                 return 0;
 456         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
 457                 return -1;
 458
 459         return scsi_sg_copy_to_buffer(scp, arr, arr_len);
 460 }
 461
 462
 463 static const char * inq_vendor_id = "Linux   ";
 464 static const char * inq_product_id = "scsi_debug      ";
 465 static const char * inq_product_rev = "0004";
 466
 467 static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
 468                            int target_dev_id, int dev_id_num,
 469                            const char * dev_id_str,
 470                            int dev_id_str_len)
 471 {
 472         int num, port_a;
 473         char b[32];
 474
 475         port_a = target_dev_id + 1;
 476         /* T10 vendor identifier field format (faked) */
 477         arr[0] = 0x2;   /* ASCII */
 478         arr[1] = 0x1;
 479         arr[2] = 0x0;
 480         memcpy(&arr[4], inq_vendor_id, 8);
 481         memcpy(&arr[12], inq_product_id, 16);
 482         memcpy(&arr[28], dev_id_str, dev_id_str_len);
 483         num = 8 + 16 + dev_id_str_len;
 484         arr[3] = num;
 485         num += 4;
 486         if (dev_id_num >= 0) {
 487                 /* NAA-5, Logical unit identifier (binary) */
 488                 arr[num++] = 0x1;       /* binary (not necessarily sas) */
 489                 arr[num++] = 0x3;       /* PIV=0, lu, naa */
 490                 arr[num++] = 0x0;
 491                 arr[num++] = 0x8;
 492                 arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
 493                 arr[num++] = 0x33;
 494                 arr[num++] = 0x33;
 495                 arr[num++] = 0x30;
 496                 arr[num++] = (dev_id_num >> 24);
 497                 arr[num++] = (dev_id_num >> 16) & 0xff;
 498                 arr[num++] = (dev_id_num >> 8) & 0xff;
 499                 arr[num++] = dev_id_num & 0xff;
 500                 /* Target relative port number */
 501                 arr[num++] = 0x61;      /* proto=sas, binary */
 502                 arr[num++] = 0x94;      /* PIV=1, target port, rel port */
 503                 arr[num++] = 0x0;       /* reserved */
 504                 arr[num++] = 0x4;       /* length */
 505                 arr[num++] = 0x0;       /* reserved */
 506                 arr[num++] = 0x0;       /* reserved */
 507                 arr[num++] = 0x0;
 508                 arr[num++] = 0x1;       /* relative port A */
 509         }
 510         /* NAA-5, Target port identifier */
 511         arr[num++] = 0x61;      /* proto=sas, binary */
 512         arr[num++] = 0x93;      /* piv=1, target port, naa */
 513         arr[num++] = 0x0;
 514         arr[num++] = 0x8;
 515         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
 516         arr[num++] = 0x22;
 517         arr[num++] = 0x22;
 518         arr[num++] = 0x20;
 519         arr[num++] = (port_a >> 24);
 520         arr[num++] = (port_a >> 16) & 0xff;
 521         arr[num++] = (port_a >> 8) & 0xff;
 522         arr[num++] = port_a & 0xff;
 523         /* NAA-5, Target port group identifier */
 524         arr[num++] = 0x61;      /* proto=sas, binary */
 525         arr[num++] = 0x95;      /* piv=1, target port group id */
 526         arr[num++] = 0x0;
 527         arr[num++] = 0x4;
 528         arr[num++] = 0;
 529         arr[num++] = 0;
 530         arr[num++] = (port_group_id >> 8) & 0xff;
 531         arr[num++] = port_group_id & 0xff;
 532         /* NAA-5, Target device identifier */
 533         arr[num++] = 0x61;      /* proto=sas, binary */
 534         arr[num++] = 0xa3;      /* piv=1, target device, naa */
 535         arr[num++] = 0x0;
 536         arr[num++] = 0x8;
 537         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
 538         arr[num++] = 0x22;
 539         arr[num++] = 0x22;
 540         arr[num++] = 0x20;
 541         arr[num++] = (target_dev_id >> 24);
 542         arr[num++] = (target_dev_id >> 16) & 0xff;
 543         arr[num++] = (target_dev_id >> 8) & 0xff;
 544         arr[num++] = target_dev_id & 0xff;
 545         /* SCSI name string: Target device identifier */
 546         arr[num++] = 0x63;      /* proto=sas, UTF-8 */
 547         arr[num++] = 0xa8;      /* piv=1, target device, SCSI name string */
 548         arr[num++] = 0x0;
 549         arr[num++] = 24;
 550         memcpy(arr + num, "naa.52222220", 12);
 551         num += 12;
 552         snprintf(b, sizeof(b), "%08X", target_dev_id);
 553         memcpy(arr + num, b, 8);
 554         num += 8;
 555         memset(arr + num, 0, 4);
 556         num += 4;
 557         return num;
 558 }
 559
 560
 561 static unsigned char vpd84_data[] = {
 562 /* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
 563     0x22,0x22,0x22,0x0,0xbb,0x1,
 564     0x22,0x22,0x22,0x0,0xbb,0x2,
 565 };
 566
 567 static int inquiry_evpd_84(unsigned char * arr)
 568 {
 569         memcpy(arr, vpd84_data, sizeof(vpd84_data));
 570         return sizeof(vpd84_data);
 571 }
 572
 573 static int inquiry_evpd_85(unsigned char * arr)
 574 {
 575         int num = 0;
 576         const char * na1 = "https://www.kernel.org/config";
 577         const char * na2 = "http://www.kernel.org/log";
 578         int plen, olen;
 579
 580         arr[num++] = 0x1;       /* lu, storage config */
 581         arr[num++] = 0x0;       /* reserved */
 582         arr[num++] = 0x0;
 583         olen = strlen(na1);
 584         plen = olen + 1;
 585         if (plen % 4)
 586                 plen = ((plen / 4) + 1) * 4;
 587         arr[num++] = plen;      /* length, null termianted, padded */
 588         memcpy(arr + num, na1, olen);
 589         memset(arr + num + olen, 0, plen - olen);
 590         num += plen;
 591
 592         arr[num++] = 0x4;       /* lu, logging */
 593         arr[num++] = 0x0;       /* reserved */
 594         arr[num++] = 0x0;
 595         olen = strlen(na2);
 596         plen = olen + 1;
 597         if (plen % 4)
 598                 plen = ((plen / 4) + 1) * 4;
 599         arr[num++] = plen;      /* length, null terminated, padded */
 600         memcpy(arr + num, na2, olen);
 601         memset(arr + num + olen, 0, plen - olen);
 602         num += plen;
 603
 604         return num;
 605 }
 606
 607 /* SCSI ports VPD page */
 608 static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
 609 {
 610         int num = 0;
 611         int port_a, port_b;
 612
 613         port_a = target_dev_id + 1;
 614         port_b = port_a + 1;
 615         arr[num++] = 0x0;       /* reserved */
 616         arr[num++] = 0x0;       /* reserved */
 617         arr[num++] = 0x0;
 618         arr[num++] = 0x1;       /* relative port 1 (primary) */
 619         memset(arr + num, 0, 6);
 620         num += 6;
 621         arr[num++] = 0x0;
 622         arr[num++] = 12;        /* length tp descriptor */
 623         /* naa-5 target port identifier (A) */
 624         arr[num++] = 0x61;      /* proto=sas, binary */
 625         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
 626         arr[num++] = 0x0;       /* reserved */
 627         arr[num++] = 0x8;       /* length */
 628         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
 629         arr[num++] = 0x22;
 630         arr[num++] = 0x22;
 631         arr[num++] = 0x20;
 632         arr[num++] = (port_a >> 24);
 633         arr[num++] = (port_a >> 16) & 0xff;
 634         arr[num++] = (port_a >> 8) & 0xff;
 635         arr[num++] = port_a & 0xff;
 636
 637         arr[num++] = 0x0;       /* reserved */
 638         arr[num++] = 0x0;       /* reserved */
 639         arr[num++] = 0x0;
 640         arr[num++] = 0x2;       /* relative port 2 (secondary) */
 641         memset(arr + num, 0, 6);
 642         num += 6;
 643         arr[num++] = 0x0;
 644         arr[num++] = 12;        /* length tp descriptor */
 645         /* naa-5 target port identifier (B) */
 646         arr[num++] = 0x61;      /* proto=sas, binary */
 647         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
 648         arr[num++] = 0x0;       /* reserved */
 649         arr[num++] = 0x8;       /* length */
 650         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
 651         arr[num++] = 0x22;
 652         arr[num++] = 0x22;
 653         arr[num++] = 0x20;
 654         arr[num++] = (port_b >> 24);
 655         arr[num++] = (port_b >> 16) & 0xff;
 656         arr[num++] = (port_b >> 8) & 0xff;
 657         arr[num++] = port_b & 0xff;
 658
 659         return num;
 660 }
 661
 662
 663 static unsigned char vpd89_data[] = {
 664 /* from 4th byte */ 0,0,0,0,
 665 'l','i','n','u','x',' ',' ',' ',
 666 'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
 667 '1','2','3','4',
 668 0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
 669 0xec,0,0,0,
 670 0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
 671 0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
 672 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
 673 0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
 674 0x53,0x41,
 675 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
 676 0x20,0x20,
 677 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
 678 0x10,0x80,
 679 0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
 680 0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
 681 0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
 682 0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
 683 0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
 684 0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
 685 0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
 686 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 687 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 688 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 689 0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
 690 0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
 691 0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
 692 0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
 693 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 694 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 695 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 696 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 697 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 698 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 699 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 700 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 701 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 702 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 703 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 704 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
 705 };
 706
 707 static int inquiry_evpd_89(unsigned char * arr)
 708 {
 709         memcpy(arr, vpd89_data, sizeof(vpd89_data));
 710         return sizeof(vpd89_data);
 711 }
 712
 713
 714 /* Block limits VPD page (SBC-3) */
 715 static unsigned char vpdb0_data[] = {
 716         /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
 717         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 718         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 719         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 720 };
 721
 722 static int inquiry_evpd_b0(unsigned char * arr)
 723 {
 724         unsigned int gran;
 725
 726         memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
 727
 728         /* Optimal transfer length granularity */
 729         gran = 1 << scsi_debug_physblk_exp;
 730         arr[2] = (gran >> 8) & 0xff;
 731         arr[3] = gran & 0xff;
 732
 733         /* Maximum Transfer Length */
 734         if (sdebug_store_sectors > 0x400) {
 735                 arr[4] = (sdebug_store_sectors >> 24) & 0xff;
 736                 arr[5] = (sdebug_store_sectors >> 16) & 0xff;
 737                 arr[6] = (sdebug_store_sectors >> 8) & 0xff;
 738                 arr[7] = sdebug_store_sectors & 0xff;
 739         }
 740
 741         /* Optimal Transfer Length */
 742         put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
 743
 744         if (scsi_debug_lbpu) {
 745                 /* Maximum Unmap LBA Count */
 746                 put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]);
 747
 748                 /* Maximum Unmap Block Descriptor Count */
 749                 put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
 750         }
 751
 752         /* Unmap Granularity Alignment */
 753         if (scsi_debug_unmap_alignment) {
 754                 put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
 755                 arr[28] |= 0x80; /* UGAVALID */
 756         }
 757
 758         /* Optimal Unmap Granularity */
 759         put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
 760
 761         /* Maximum WRITE SAME Length */
 762         put_unaligned_be64(scsi_debug_write_same_length, &arr[32]);
 763
 764         return 0x3c; /* Mandatory page length for Logical Block Provisioning */
 765
 766         return sizeof(vpdb0_data);
 767 }
 768
 769 /* Block device characteristics VPD page (SBC-3) */
 770 static int inquiry_evpd_b1(unsigned char *arr)
 771 {
 772         memset(arr, 0, 0x3c);
 773         arr[0] = 0;
 774         arr[1] = 1;     /* non rotating medium (e.g. solid state) */
 775         arr[2] = 0;
 776         arr[3] = 5;     /* less than 1.8" */
 777
 778         return 0x3c;
 779 }
 780
 781 /* Logical block provisioning VPD page (SBC-3) */
 782 static int inquiry_evpd_b2(unsigned char *arr)
 783 {
 784         memset(arr, 0, 0x4);
 785         arr[0] = 0;                     /* threshold exponent */
 786
 787         if (scsi_debug_lbpu)
 788                 arr[1] = 1 << 7;
 789
 790         if (scsi_debug_lbpws)
 791                 arr[1] |= 1 << 6;
 792
 793         if (scsi_debug_lbpws10)
 794                 arr[1] |= 1 << 5;
 795
 796         if (scsi_debug_lbprz)
 797                 arr[1] |= 1 << 2;
 798
 799         return 0x4;
 800 }
 801
 802 #define SDEBUG_LONG_INQ_SZ 96
 803 #define SDEBUG_MAX_INQ_ARR_SZ 584
 804
 805 static int resp_inquiry(struct scsi_cmnd * scp, int target,
 806                         struct sdebug_dev_info * devip)
 807 {
 808         unsigned char pq_pdt;
 809         unsigned char * arr;
 810         unsigned char *cmd = (unsigned char *)scp->cmnd;
 811         int alloc_len, n, ret;
 812
 813         alloc_len = (cmd[3] << 8) + cmd[4];
 814         arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
 815         if (! arr)
 816                 return DID_REQUEUE << 16;
 817         if (devip->wlun)
 818                 pq_pdt = 0x1e;  /* present, wlun */
 819         else if (scsi_debug_no_lun_0 && (0 == devip->lun))
 820                 pq_pdt = 0x7f;  /* not present, no device type */
 821         else
 822                 pq_pdt = (scsi_debug_ptype & 0x1f);
 823         arr[0] = pq_pdt;
 824         if (0x2 & cmd[1]) {  /* CMDDT bit set */
 825                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 826                                 0);
 827                 kfree(arr);
 828                 return check_condition_result;
 829         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
 830                 int lu_id_num, port_group_id, target_dev_id, len;
 831                 char lu_id_str[6];
 832                 int host_no = devip->sdbg_host->shost->host_no;
 833
 834                 port_group_id = (((host_no + 1) & 0x7f) << 8) +
 835                     (devip->channel & 0x7f);
 836                 if (0 == scsi_debug_vpd_use_hostno)
 837                         host_no = 0;
 838                 lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
 839                             (devip->target * 1000) + devip->lun);
 840                 target_dev_id = ((host_no + 1) * 2000) +
 841                                  (devip->target * 1000) - 3;
 842                 len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
 843                 if (0 == cmd[2]) { /* supported vital product data pages */
 844                         arr[1] = cmd[2];        /*sanity */
 845                         n = 4;
 846                         arr[n++] = 0x0;   /* this page */
 847                         arr[n++] = 0x80;  /* unit serial number */
 848                         arr[n++] = 0x83;  /* device identification */
 849                         arr[n++] = 0x84;  /* software interface ident. */
 850                         arr[n++] = 0x85;  /* management network addresses */
 851                         arr[n++] = 0x86;  /* extended inquiry */
 852                         arr[n++] = 0x87;  /* mode page policy */
 853                         arr[n++] = 0x88;  /* SCSI ports */
 854                         arr[n++] = 0x89;  /* ATA information */
 855                         arr[n++] = 0xb0;  /* Block limits (SBC) */
 856                         arr[n++] = 0xb1;  /* Block characteristics (SBC) */
 857                         if (scsi_debug_lbp()) /* Logical Block Prov. (SBC) */
 858                                 arr[n++] = 0xb2;
 859                         arr[3] = n - 4;   /* number of supported VPD pages */
 860                 } else if (0x80 == cmd[2]) { /* unit serial number */
 861                         arr[1] = cmd[2];        /*sanity */
 862                         arr[3] = len;
 863                         memcpy(&arr[4], lu_id_str, len);
 864                 } else if (0x83 == cmd[2]) { /* device identification */
 865                         arr[1] = cmd[2];        /*sanity */
 866                         arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
 867                                                  target_dev_id, lu_id_num,
 868                                                  lu_id_str, len);
 869                 } else if (0x84 == cmd[2]) { /* Software interface ident. */
 870                         arr[1] = cmd[2];        /*sanity */
 871                         arr[3] = inquiry_evpd_84(&arr[4]);
 872                 } else if (0x85 == cmd[2]) { /* Management network addresses */
 873                         arr[1] = cmd[2];        /*sanity */
 874                         arr[3] = inquiry_evpd_85(&arr[4]);
 875                 } else if (0x86 == cmd[2]) { /* extended inquiry */
 876                         arr[1] = cmd[2];        /*sanity */
 877                         arr[3] = 0x3c;  /* number of following entries */
 878                         if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION)
 879                                 arr[4] = 0x4;   /* SPT: GRD_CHK:1 */
 880                         else if (scsi_debug_dif)
 881                                 arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
 882                         else
 883                                 arr[4] = 0x0;   /* no protection stuff */
 884                         arr[5] = 0x7;   /* head of q, ordered + simple q's */
 885                 } else if (0x87 == cmd[2]) { /* mode page policy */
 886                         arr[1] = cmd[2];        /*sanity */
 887                         arr[3] = 0x8;   /* number of following entries */
 888                         arr[4] = 0x2;   /* disconnect-reconnect mp */
 889                         arr[6] = 0x80;  /* mlus, shared */
 890                         arr[8] = 0x18;   /* protocol specific lu */
 891                         arr[10] = 0x82;  /* mlus, per initiator port */
 892                 } else if (0x88 == cmd[2]) { /* SCSI Ports */
 893                         arr[1] = cmd[2];        /*sanity */
 894                         arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
 895                 } else if (0x89 == cmd[2]) { /* ATA information */
 896                         arr[1] = cmd[2];        /*sanity */
 897                         n = inquiry_evpd_89(&arr[4]);
 898                         arr[2] = (n >> 8);
 899                         arr[3] = (n & 0xff);
 900                 } else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
 901                         arr[1] = cmd[2];        /*sanity */
 902                         arr[3] = inquiry_evpd_b0(&arr[4]);
 903                 } else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */
 904                         arr[1] = cmd[2];        /*sanity */
 905                         arr[3] = inquiry_evpd_b1(&arr[4]);
 906                 } else if (0xb2 == cmd[2]) { /* Logical Block Prov. (SBC) */
 907                         arr[1] = cmd[2];        /*sanity */
 908                         arr[3] = inquiry_evpd_b2(&arr[4]);
 909                 } else {
 910                         /* Illegal request, invalid field in cdb */
 911                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
 912                                         INVALID_FIELD_IN_CDB, 0);
 913                         kfree(arr);
 914                         return check_condition_result;
 915                 }
 916                 len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
 917                 ret = fill_from_dev_buffer(scp, arr,
 918                             min(len, SDEBUG_MAX_INQ_ARR_SZ));
 919                 kfree(arr);
 920                 return ret;
 921         }
 922         /* drops through here for a standard inquiry */
 923         arr[1] = scsi_debug_removable ? 0x80 : 0;       /* Removable disk */
 924         arr[2] = scsi_debug_scsi_level;
 925         arr[3] = 2;    /* response_data_format==2 */
 926         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
 927         arr[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */
 928         if (0 == scsi_debug_vpd_use_hostno)
 929                 arr[5] = 0x10; /* claim: implicit TGPS */
 930         arr[6] = 0x10; /* claim: MultiP */
 931         /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
 932         arr[7] = 0xa; /* claim: LINKED + CMDQUE */
 933         memcpy(&arr[8], inq_vendor_id, 8);
 934         memcpy(&arr[16], inq_product_id, 16);
 935         memcpy(&arr[32], inq_product_rev, 4);
 936         /* version descriptors (2 bytes each) follow */
 937         arr[58] = 0x0; arr[59] = 0x77; /* SAM-3 ANSI */
 938         arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
 939         n = 62;
 940         if (scsi_debug_ptype == 0) {
 941                 arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
 942         } else if (scsi_debug_ptype == 1) {
 943                 arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
 944         }
 945         arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
 946         ret = fill_from_dev_buffer(scp, arr,
 947                             min(alloc_len, SDEBUG_LONG_INQ_SZ));
 948         kfree(arr);
 949         return ret;
 950 }
 951
 952 static int resp_requests(struct scsi_cmnd * scp,
 953                          struct sdebug_dev_info * devip)
 954 {
 955         unsigned char * sbuff;
 956         unsigned char *cmd = (unsigned char *)scp->cmnd;
 957         unsigned char arr[SDEBUG_SENSE_LEN];
 958         int want_dsense;
 959         int len = 18;
 960
 961         memset(arr, 0, sizeof(arr));
 962         if (devip->reset == 1)
 963                 mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
 964         want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
 965         sbuff = devip->sense_buff;
 966         if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
 967                 if (want_dsense) {
 968                         arr[0] = 0x72;
 969                         arr[1] = 0x0;           /* NO_SENSE in sense_key */
 970                         arr[2] = THRESHOLD_EXCEEDED;
 971                         arr[3] = 0xff;          /* TEST set and MRIE==6 */
 972                 } else {
 973                         arr[0] = 0x70;
 974                         arr[2] = 0x0;           /* NO_SENSE in sense_key */
 975                         arr[7] = 0xa;           /* 18 byte sense buffer */
 976                         arr[12] = THRESHOLD_EXCEEDED;
 977                         arr[13] = 0xff;         /* TEST set and MRIE==6 */
 978                 }
 979         } else {
 980                 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
 981                 if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
 982                         /* DESC bit set and sense_buff in fixed format */
 983                         memset(arr, 0, sizeof(arr));
 984                         arr[0] = 0x72;
 985                         arr[1] = sbuff[2];     /* sense key */
 986                         arr[2] = sbuff[12];    /* asc */
 987                         arr[3] = sbuff[13];    /* ascq */
 988                         len = 8;
 989                 }
 990         }
 991         mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
 992         return fill_from_dev_buffer(scp, arr, len);
 993 }
 994
 995 static int resp_start_stop(struct scsi_cmnd * scp,
 996                            struct sdebug_dev_info * devip)
 997 {
 998         unsigned char *cmd = (unsigned char *)scp->cmnd;
 999         int power_cond, errsts, start;
1000
1001         if ((errsts = check_readiness(scp, 1, devip)))
1002                 return errsts;
1003         power_cond = (cmd[4] & 0xf0) >> 4;
1004         if (power_cond) {
1005                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1006                                 0);
1007                 return check_condition_result;
1008         }
1009         start = cmd[4] & 1;
1010         if (start == devip->stopped)
1011                 devip->stopped = !start;
1012         return 0;
1013 }
1014
1015 static sector_t get_sdebug_capacity(void)
1016 {
1017         if (scsi_debug_virtual_gb > 0)
1018                 return (sector_t)scsi_debug_virtual_gb *
1019                         (1073741824 / scsi_debug_sector_size);
1020         else
1021                 return sdebug_store_sectors;
1022 }
1023
1024 #define SDEBUG_READCAP_ARR_SZ 8
1025 static int resp_readcap(struct scsi_cmnd * scp,
1026                         struct sdebug_dev_info * devip)
1027 {
1028         unsigned char arr[SDEBUG_READCAP_ARR_SZ];
1029         unsigned int capac;
1030         int errsts;
1031
1032         if ((errsts = check_readiness(scp, 1, devip)))
1033                 return errsts;
1034         /* following just in case virtual_gb changed */
1035         sdebug_capacity = get_sdebug_capacity();
1036         memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
1037         if (sdebug_capacity < 0xffffffff) {
1038                 capac = (unsigned int)sdebug_capacity - 1;
1039                 arr[0] = (capac >> 24);
1040                 arr[1] = (capac >> 16) & 0xff;
1041                 arr[2] = (capac >> 8) & 0xff;
1042                 arr[3] = capac & 0xff;
1043         } else {
1044                 arr[0] = 0xff;
1045                 arr[1] = 0xff;
1046                 arr[2] = 0xff;
1047                 arr[3] = 0xff;
1048         }
1049         arr[6] = (scsi_debug_sector_size >> 8) & 0xff;
1050         arr[7] = scsi_debug_sector_size & 0xff;
1051         return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
1052 }
1053
1054 #define SDEBUG_READCAP16_ARR_SZ 32
1055 static int resp_readcap16(struct scsi_cmnd * scp,
1056                           struct sdebug_dev_info * devip)
1057 {
1058         unsigned char *cmd = (unsigned char *)scp->cmnd;
1059         unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
1060         unsigned long long capac;
1061         int errsts, k, alloc_len;
1062
1063         if ((errsts = check_readiness(scp, 1, devip)))
1064                 return errsts;
1065         alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
1066                      + cmd[13]);
1067         /* following just in case virtual_gb changed */
1068         sdebug_capacity = get_sdebug_capacity();
1069         memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
1070         capac = sdebug_capacity - 1;
1071         for (k = 0; k < 8; ++k, capac >>= 8)
1072                 arr[7 - k] = capac & 0xff;
1073         arr[8] = (scsi_debug_sector_size >> 24) & 0xff;
1074         arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
1075         arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
1076         arr[11] = scsi_debug_sector_size & 0xff;
1077         arr[13] = scsi_debug_physblk_exp & 0xf;
1078         arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
1079
1080         if (scsi_debug_lbp()) {
1081                 arr[14] |= 0x80; /* LBPME */
1082                 if (scsi_debug_lbprz)
1083                         arr[14] |= 0x40; /* LBPRZ */
1084         }
1085
1086         arr[15] = scsi_debug_lowest_aligned & 0xff;
1087
1088         if (scsi_debug_dif) {
1089                 arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
1090                 arr[12] |= 1; /* PROT_EN */
1091         }
1092
1093         return fill_from_dev_buffer(scp, arr,
1094                                     min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
1095 }
1096
1097 #define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
1098
1099 static int resp_report_tgtpgs(struct scsi_cmnd * scp,
1100                               struct sdebug_dev_info * devip)
1101 {
1102         unsigned char *cmd = (unsigned char *)scp->cmnd;
1103         unsigned char * arr;
1104         int host_no = devip->sdbg_host->shost->host_no;
1105         int n, ret, alen, rlen;
1106         int port_group_a, port_group_b, port_a, port_b;
1107
1108         alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
1109                 + cmd[9]);
1110
1111         arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
1112         if (! arr)
1113                 return DID_REQUEUE << 16;
1114         /*
1115          * EVPD page 0x88 states we have two ports, one
1116          * real and a fake port with no device connected.
1117          * So we create two port groups with one port each
1118          * and set the group with port B to unavailable.
1119          */
1120         port_a = 0x1; /* relative port A */
1121         port_b = 0x2; /* relative port B */
1122         port_group_a = (((host_no + 1) & 0x7f) << 8) +
1123             (devip->channel & 0x7f);
1124         port_group_b = (((host_no + 1) & 0x7f) << 8) +
1125             (devip->channel & 0x7f) + 0x80;
1126
1127         /*
1128          * The asymmetric access state is cycled according to the host_id.
1129          */
1130         n = 4;
1131         if (0 == scsi_debug_vpd_use_hostno) {
1132             arr[n++] = host_no % 3; /* Asymm access state */
1133             arr[n++] = 0x0F; /* claim: all states are supported */
1134         } else {
1135             arr[n++] = 0x0; /* Active/Optimized path */
1136             arr[n++] = 0x01; /* claim: only support active/optimized paths */
1137         }
1138         arr[n++] = (port_group_a >> 8) & 0xff;
1139         arr[n++] = port_group_a & 0xff;
1140         arr[n++] = 0;    /* Reserved */
1141         arr[n++] = 0;    /* Status code */
1142         arr[n++] = 0;    /* Vendor unique */
1143         arr[n++] = 0x1;  /* One port per group */
1144         arr[n++] = 0;    /* Reserved */
1145         arr[n++] = 0;    /* Reserved */
1146         arr[n++] = (port_a >> 8) & 0xff;
1147         arr[n++] = port_a & 0xff;
1148         arr[n++] = 3;    /* Port unavailable */
1149         arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
1150         arr[n++] = (port_group_b >> 8) & 0xff;
1151         arr[n++] = port_group_b & 0xff;
1152         arr[n++] = 0;    /* Reserved */
1153         arr[n++] = 0;    /* Status code */
1154         arr[n++] = 0;    /* Vendor unique */
1155         arr[n++] = 0x1;  /* One port per group */
1156         arr[n++] = 0;    /* Reserved */
1157         arr[n++] = 0;    /* Reserved */
1158         arr[n++] = (port_b >> 8) & 0xff;
1159         arr[n++] = port_b & 0xff;
1160
1161         rlen = n - 4;
1162         arr[0] = (rlen >> 24) & 0xff;
1163         arr[1] = (rlen >> 16) & 0xff;
1164         arr[2] = (rlen >> 8) & 0xff;
1165         arr[3] = rlen & 0xff;
1166
1167         /*
1168          * Return the smallest value of either
1169          * - The allocated length
1170          * - The constructed command length
1171          * - The maximum array size
1172          */
1173         rlen = min(alen,n);
1174         ret = fill_from_dev_buffer(scp, arr,
1175                                    min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
1176         kfree(arr);
1177         return ret;
1178 }
1179
1180 /* <<Following mode page info copied from ST318451LW>> */
1181
1182 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
1183 {       /* Read-Write Error Recovery page for mode_sense */
1184         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
1185                                         5, 0, 0xff, 0xff};
1186
1187         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
1188         if (1 == pcontrol)
1189                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
1190         return sizeof(err_recov_pg);
1191 }
1192
1193 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
1194 {       /* Disconnect-Reconnect page for mode_sense */
1195         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
1196                                          0, 0, 0, 0, 0, 0, 0, 0};
1197
1198         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
1199         if (1 == pcontrol)
1200                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
1201         return sizeof(disconnect_pg);
1202 }
1203
1204 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
1205 {       /* Format device page for mode_sense */
1206         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
1207                                      0, 0, 0, 0, 0, 0, 0, 0,
1208                                      0, 0, 0, 0, 0x40, 0, 0, 0};
1209
1210         memcpy(p, format_pg, sizeof(format_pg));
1211         p[10] = (sdebug_sectors_per >> 8) & 0xff;
1212         p[11] = sdebug_sectors_per & 0xff;
1213         p[12] = (scsi_debug_sector_size >> 8) & 0xff;
1214         p[13] = scsi_debug_sector_size & 0xff;
1215         if (scsi_debug_removable)
1216                 p[20] |= 0x20; /* should agree with INQUIRY */
1217         if (1 == pcontrol)
1218                 memset(p + 2, 0, sizeof(format_pg) - 2);
1219         return sizeof(format_pg);
1220 }
1221
1222 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
1223 {       /* Caching page for mode_sense */
1224         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1225                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
1226
1227         memcpy(p, caching_pg, sizeof(caching_pg));
1228         if (1 == pcontrol)
1229                 memset(p + 2, 0, sizeof(caching_pg) - 2);
1230         return sizeof(caching_pg);
1231 }
1232
1233 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
1234 {       /* Control mode page for mode_sense */
1235         unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
1236                                         0, 0, 0, 0};
1237         unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1238                                      0, 0, 0x2, 0x4b};
1239
1240         if (scsi_debug_dsense)
1241                 ctrl_m_pg[2] |= 0x4;
1242         else
1243                 ctrl_m_pg[2] &= ~0x4;
1244
1245         if (scsi_debug_ato)
1246                 ctrl_m_pg[5] |= 0x80; /* ATO=1 */
1247
1248         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
1249         if (1 == pcontrol)
1250                 memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
1251         else if (2 == pcontrol)
1252                 memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
1253         return sizeof(ctrl_m_pg);
1254 }
1255
1256
1257 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
1258 {       /* Informational Exceptions control mode page for mode_sense */
1259         unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
1260                                        0, 0, 0x0, 0x0};
1261         unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1262                                       0, 0, 0x0, 0x0};
1263
1264         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
1265         if (1 == pcontrol)
1266                 memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
1267         else if (2 == pcontrol)
1268                 memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
1269         return sizeof(iec_m_pg);
1270 }
1271
1272 static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
1273 {       /* SAS SSP mode page - short format for mode_sense */
1274         unsigned char sas_sf_m_pg[] = {0x19, 0x6,
1275                 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
1276
1277         memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
1278         if (1 == pcontrol)
1279                 memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
1280         return sizeof(sas_sf_m_pg);
1281 }
1282
1283
1284 static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
1285                               int target_dev_id)
1286 {       /* SAS phy control and discover mode page for mode_sense */
1287         unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
1288                     0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
1289                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1290                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1291                     0x2, 0, 0, 0, 0, 0, 0, 0,
1292                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1293                     0, 0, 0, 0, 0, 0, 0, 0,
1294                     0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
1295                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1296                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1297                     0x3, 0, 0, 0, 0, 0, 0, 0,
1298                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1299                     0, 0, 0, 0, 0, 0, 0, 0,
1300                 };
1301         int port_a, port_b;
1302
1303         port_a = target_dev_id + 1;
1304         port_b = port_a + 1;
1305         memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
1306         p[20] = (port_a >> 24);
1307         p[21] = (port_a >> 16) & 0xff;
1308         p[22] = (port_a >> 8) & 0xff;
1309         p[23] = port_a & 0xff;
1310         p[48 + 20] = (port_b >> 24);
1311         p[48 + 21] = (port_b >> 16) & 0xff;
1312         p[48 + 22] = (port_b >> 8) & 0xff;
1313         p[48 + 23] = port_b & 0xff;
1314         if (1 == pcontrol)
1315                 memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
1316         return sizeof(sas_pcd_m_pg);
1317 }
1318
1319 static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
1320 {       /* SAS SSP shared protocol specific port mode subpage */
1321         unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
1322                     0, 0, 0, 0, 0, 0, 0, 0,
1323                 };
1324
1325         memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
1326         if (1 == pcontrol)
1327                 memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
1328         return sizeof(sas_sha_m_pg);
1329 }
1330
1331 #define SDEBUG_MAX_MSENSE_SZ 256
1332
1333 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
1334                            struct sdebug_dev_info * devip)
1335 {
1336         unsigned char dbd, llbaa;
1337         int pcontrol, pcode, subpcode, bd_len;
1338         unsigned char dev_spec;
1339         int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
1340         unsigned char * ap;
1341         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
1342         unsigned char *cmd = (unsigned char *)scp->cmnd;
1343
1344         if ((errsts = check_readiness(scp, 1, devip)))
1345                 return errsts;
1346         dbd = !!(cmd[1] & 0x8);
1347         pcontrol = (cmd[2] & 0xc0) >> 6;
1348         pcode = cmd[2] & 0x3f;
1349         subpcode = cmd[3];
1350         msense_6 = (MODE_SENSE == cmd[0]);
1351         llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
1352         if ((0 == scsi_debug_ptype) && (0 == dbd))
1353                 bd_len = llbaa ? 16 : 8;
1354         else
1355                 bd_len = 0;
1356         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
1357         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
1358         if (0x3 == pcontrol) {  /* Saving values not supported */
1359                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
1360                                 0);
1361                 return check_condition_result;
1362         }
1363         target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
1364                         (devip->target * 1000) - 3;
1365         /* set DPOFUA bit for disks */
1366         if (0 == scsi_debug_ptype)
1367                 dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
1368         else
1369                 dev_spec = 0x0;
1370         if (msense_6) {
1371                 arr[2] = dev_spec;
1372                 arr[3] = bd_len;
1373                 offset = 4;
1374         } else {
1375                 arr[3] = dev_spec;
1376                 if (16 == bd_len)
1377                         arr[4] = 0x1;   /* set LONGLBA bit */
1378                 arr[7] = bd_len;        /* assume 255 or less */
1379                 offset = 8;
1380         }
1381         ap = arr + offset;
1382         if ((bd_len > 0) && (!sdebug_capacity))
1383                 sdebug_capacity = get_sdebug_capacity();
1384
1385         if (8 == bd_len) {
1386                 if (sdebug_capacity > 0xfffffffe) {
1387                         ap[0] = 0xff;
1388                         ap[1] = 0xff;
1389                         ap[2] = 0xff;
1390                         ap[3] = 0xff;
1391                 } else {
1392                         ap[0] = (sdebug_capacity >> 24) & 0xff;
1393                         ap[1] = (sdebug_capacity >> 16) & 0xff;
1394                         ap[2] = (sdebug_capacity >> 8) & 0xff;
1395                         ap[3] = sdebug_capacity & 0xff;
1396                 }
1397                 ap[6] = (scsi_debug_sector_size >> 8) & 0xff;
1398                 ap[7] = scsi_debug_sector_size & 0xff;
1399                 offset += bd_len;
1400                 ap = arr + offset;
1401         } else if (16 == bd_len) {
1402                 unsigned long long capac = sdebug_capacity;
1403
1404                 for (k = 0; k < 8; ++k, capac >>= 8)
1405                         ap[7 - k] = capac & 0xff;
1406                 ap[12] = (scsi_debug_sector_size >> 24) & 0xff;
1407                 ap[13] = (scsi_debug_sector_size >> 16) & 0xff;
1408                 ap[14] = (scsi_debug_sector_size >> 8) & 0xff;
1409                 ap[15] = scsi_debug_sector_size & 0xff;
1410                 offset += bd_len;
1411                 ap = arr + offset;
1412         }
1413
1414         if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
1415                 /* TODO: Control Extension page */
1416                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1417                                 0);
1418                 return check_condition_result;
1419         }
1420         switch (pcode) {
1421         case 0x1:       /* Read-Write error recovery page, direct access */
1422                 len = resp_err_recov_pg(ap, pcontrol, target);
1423                 offset += len;
1424                 break;
1425         case 0x2:       /* Disconnect-Reconnect page, all devices */
1426                 len = resp_disconnect_pg(ap, pcontrol, target);
1427                 offset += len;
1428                 break;
1429         case 0x3:       /* Format device page, direct access */
1430                 len = resp_format_pg(ap, pcontrol, target);
1431                 offset += len;
1432                 break;
1433         case 0x8:       /* Caching page, direct access */
1434                 len = resp_caching_pg(ap, pcontrol, target);
1435                 offset += len;
1436                 break;
1437         case 0xa:       /* Control Mode page, all devices */
1438                 len = resp_ctrl_m_pg(ap, pcontrol, target);
1439                 offset += len;
1440                 break;
1441         case 0x19:      /* if spc==1 then sas phy, control+discover */
1442                 if ((subpcode > 0x2) && (subpcode < 0xff)) {
1443                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1444                                         INVALID_FIELD_IN_CDB, 0);
1445                         return check_condition_result;
1446                 }
1447                 len = 0;
1448                 if ((0x0 == subpcode) || (0xff == subpcode))
1449                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1450                 if ((0x1 == subpcode) || (0xff == subpcode))
1451                         len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
1452                                                   target_dev_id);
1453                 if ((0x2 == subpcode) || (0xff == subpcode))
1454                         len += resp_sas_sha_m_spg(ap + len, pcontrol);
1455                 offset += len;
1456                 break;
1457         case 0x1c:      /* Informational Exceptions Mode page, all devices */
1458                 len = resp_iec_m_pg(ap, pcontrol, target);
1459                 offset += len;
1460                 break;
1461         case 0x3f:      /* Read all Mode pages */
1462                 if ((0 == subpcode) || (0xff == subpcode)) {
1463                         len = resp_err_recov_pg(ap, pcontrol, target);
1464                         len += resp_disconnect_pg(ap + len, pcontrol, target);
1465                         len += resp_format_pg(ap + len, pcontrol, target);
1466                         len += resp_caching_pg(ap + len, pcontrol, target);
1467                         len += resp_ctrl_m_pg(ap + len, pcontrol, target);
1468                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1469                         if (0xff == subpcode) {
1470                                 len += resp_sas_pcd_m_spg(ap + len, pcontrol,
1471                                                   target, target_dev_id);
1472                                 len += resp_sas_sha_m_spg(ap + len, pcontrol);
1473                         }
1474                         len += resp_iec_m_pg(ap + len, pcontrol, target);
1475                 } else {
1476                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1477                                         INVALID_FIELD_IN_CDB, 0);
1478                         return check_condition_result;
1479                 }
1480                 offset += len;
1481                 break;
1482         default:
1483                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1484                                 0);
1485                 return check_condition_result;
1486         }
1487         if (msense_6)
1488                 arr[0] = offset - 1;
1489         else {
1490                 arr[0] = ((offset - 2) >> 8) & 0xff;
1491                 arr[1] = (offset - 2) & 0xff;
1492         }
1493         return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
1494 }
1495
1496 #define SDEBUG_MAX_MSELECT_SZ 512
1497
1498 static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
1499                             struct sdebug_dev_info * devip)
1500 {
1501         int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
1502         int param_len, res, errsts, mpage;
1503         unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
1504         unsigned char *cmd = (unsigned char *)scp->cmnd;
1505
1506         if ((errsts = check_readiness(scp, 1, devip)))
1507                 return errsts;
1508         memset(arr, 0, sizeof(arr));
1509         pf = cmd[1] & 0x10;
1510         sp = cmd[1] & 0x1;
1511         param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]);
1512         if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
1513                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1514                                 INVALID_FIELD_IN_CDB, 0);
1515                 return check_condition_result;
1516         }
1517         res = fetch_to_dev_buffer(scp, arr, param_len);
1518         if (-1 == res)
1519                 return (DID_ERROR << 16);
1520         else if ((res < param_len) &&
1521                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
1522                 printk(KERN_INFO "scsi_debug: mode_select: cdb indicated=%d, "
1523                        " IO sent=%d bytes\n", param_len, res);
1524         md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);
1525         bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);
1526         if (md_len > 2) {
1527                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1528                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1529                 return check_condition_result;
1530         }
1531         off = bd_len + (mselect6 ? 4 : 8);
1532         mpage = arr[off] & 0x3f;
1533         ps = !!(arr[off] & 0x80);
1534         if (ps) {
1535                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1536                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1537                 return check_condition_result;
1538         }
1539         spf = !!(arr[off] & 0x40);
1540         pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) :
1541                        (arr[off + 1] + 2);
1542         if ((pg_len + off) > param_len) {
1543                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1544                                 PARAMETER_LIST_LENGTH_ERR, 0);
1545                 return check_condition_result;
1546         }
1547         switch (mpage) {
1548         case 0xa:      /* Control Mode page */
1549                 if (ctrl_m_pg[1] == arr[off + 1]) {
1550                         memcpy(ctrl_m_pg + 2, arr + off + 2,
1551                                sizeof(ctrl_m_pg) - 2);
1552                         scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4);
1553                         return 0;
1554                 }
1555                 break;
1556         case 0x1c:      /* Informational Exceptions Mode page */
1557                 if (iec_m_pg[1] == arr[off + 1]) {
1558                         memcpy(iec_m_pg + 2, arr + off + 2,
1559                                sizeof(iec_m_pg) - 2);
1560                         return 0;
1561                 }
1562                 break;
1563         default:
1564                 break;
1565         }
1566         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1567                         INVALID_FIELD_IN_PARAM_LIST, 0);
1568         return check_condition_result;
1569 }
1570
1571 static int resp_temp_l_pg(unsigned char * arr)
1572 {
1573         unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
1574                                      0x0, 0x1, 0x3, 0x2, 0x0, 65,
1575                 };
1576
1577         memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
1578         return sizeof(temp_l_pg);
1579 }
1580
1581 static int resp_ie_l_pg(unsigned char * arr)
1582 {
1583         unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
1584                 };
1585
1586         memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
1587         if (iec_m_pg[2] & 0x4) {        /* TEST bit set */
1588                 arr[4] = THRESHOLD_EXCEEDED;
1589                 arr[5] = 0xff;
1590         }
1591         return sizeof(ie_l_pg);
1592 }
1593
1594 #define SDEBUG_MAX_LSENSE_SZ 512
1595
1596 static int resp_log_sense(struct scsi_cmnd * scp,
1597                           struct sdebug_dev_info * devip)
1598 {
1599         int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;
1600         unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
1601         unsigned char *cmd = (unsigned char *)scp->cmnd;
1602
1603         if ((errsts = check_readiness(scp, 1, devip)))
1604                 return errsts;
1605         memset(arr, 0, sizeof(arr));
1606         ppc = cmd[1] & 0x2;
1607         sp = cmd[1] & 0x1;
1608         if (ppc || sp) {
1609                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1610                                 INVALID_FIELD_IN_CDB, 0);
1611                 return check_condition_result;
1612         }
1613         pcontrol = (cmd[2] & 0xc0) >> 6;
1614         pcode = cmd[2] & 0x3f;
1615         subpcode = cmd[3] & 0xff;
1616         alloc_len = (cmd[7] << 8) + cmd[8];
1617         arr[0] = pcode;
1618         if (0 == subpcode) {
1619                 switch (pcode) {
1620                 case 0x0:       /* Supported log pages log page */
1621                         n = 4;
1622                         arr[n++] = 0x0;         /* this page */
1623                         arr[n++] = 0xd;         /* Temperature */
1624                         arr[n++] = 0x2f;        /* Informational exceptions */
1625                         arr[3] = n - 4;
1626                         break;
1627                 case 0xd:       /* Temperature log page */
1628                         arr[3] = resp_temp_l_pg(arr + 4);
1629                         break;
1630                 case 0x2f:      /* Informational exceptions log page */
1631                         arr[3] = resp_ie_l_pg(arr + 4);
1632                         break;
1633                 default:
1634                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1635                                         INVALID_FIELD_IN_CDB, 0);
1636                         return check_condition_result;
1637                 }
1638         } else if (0xff == subpcode) {
1639                 arr[0] |= 0x40;
1640                 arr[1] = subpcode;
1641                 switch (pcode) {
1642                 case 0x0:       /* Supported log pages and subpages log page */
1643                         n = 4;
1644                         arr[n++] = 0x0;
1645                         arr[n++] = 0x0;         /* 0,0 page */
1646                         arr[n++] = 0x0;
1647                         arr[n++] = 0xff;        /* this page */
1648                         arr[n++] = 0xd;
1649                         arr[n++] = 0x0;         /* Temperature */
1650                         arr[n++] = 0x2f;
1651                         arr[n++] = 0x0; /* Informational exceptions */
1652                         arr[3] = n - 4;
1653                         break;
1654                 case 0xd:       /* Temperature subpages */
1655                         n = 4;
1656                         arr[n++] = 0xd;
1657                         arr[n++] = 0x0;         /* Temperature */
1658                         arr[3] = n - 4;
1659                         break;
1660                 case 0x2f:      /* Informational exceptions subpages */
1661                         n = 4;
1662                         arr[n++] = 0x2f;
1663                         arr[n++] = 0x0;         /* Informational exceptions */
1664                         arr[3] = n - 4;
1665                         break;
1666                 default:
1667                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1668                                         INVALID_FIELD_IN_CDB, 0);
1669                         return check_condition_result;
1670                 }
1671         } else {
1672                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1673                                 INVALID_FIELD_IN_CDB, 0);
1674                 return check_condition_result;
1675         }
1676         len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
1677         return fill_from_dev_buffer(scp, arr,
1678                     min(len, SDEBUG_MAX_INQ_ARR_SZ));
1679 }
1680
1681 static int check_device_access_params(struct sdebug_dev_info *devi,
1682                                       unsigned long long lba, unsigned int num)
1683 {
1684         if (lba + num > sdebug_capacity) {
1685                 mk_sense_buffer(devi, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0);
1686                 return check_condition_result;
1687         }
1688         /* transfer length excessive (tie in to block limits VPD page) */
1689         if (num > sdebug_store_sectors) {
1690                 mk_sense_buffer(devi, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
1691                 return check_condition_result;
1692         }
1693         return 0;
1694 }
1695
1696 static int do_device_access(struct scsi_cmnd *scmd,
1697                             struct sdebug_dev_info *devi,
1698                             unsigned long long lba, unsigned int num, int write)
1699 {
1700         int ret;
1701         unsigned long long block, rest = 0;
1702         int (*func)(struct scsi_cmnd *, unsigned char *, int);
1703
1704         func = write ? fetch_to_dev_buffer : fill_from_dev_buffer;
1705
1706         block = do_div(lba, sdebug_store_sectors);
1707         if (block + num > sdebug_store_sectors)
1708                 rest = block + num - sdebug_store_sectors;
1709
1710         ret = func(scmd, fake_storep + (block * scsi_debug_sector_size),
1711                    (num - rest) * scsi_debug_sector_size);
1712         if (!ret && rest)
1713                 ret = func(scmd, fake_storep, rest * scsi_debug_sector_size);
1714
1715         return ret;
1716 }
1717
1718 static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
1719                             unsigned int sectors, u32 ei_lba)
1720 {
1721         unsigned int i, resid;
1722         struct scatterlist *psgl;
1723         struct sd_dif_tuple *sdt;
1724         sector_t sector;
1725         sector_t tmp_sec = start_sec;
1726         void *paddr;
1727
1728         start_sec = do_div(tmp_sec, sdebug_store_sectors);
1729
1730         sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
1731
1732         for (i = 0 ; i < sectors ; i++) {
1733                 u16 csum;
1734
1735                 if (sdt[i].app_tag == 0xffff)
1736                         continue;
1737
1738                 sector = start_sec + i;
1739
1740                 switch (scsi_debug_guard) {
1741                 case 1:
1742                         csum = ip_compute_csum(fake_storep +
1743                                                sector * scsi_debug_sector_size,
1744                                                scsi_debug_sector_size);
1745                         break;
1746                 case 0:
1747                         csum = crc_t10dif(fake_storep +
1748                                           sector * scsi_debug_sector_size,
1749                                           scsi_debug_sector_size);
1750                         csum = cpu_to_be16(csum);
1751                         break;
1752                 default:
1753                         BUG();
1754                 }
1755
1756                 if (sdt[i].guard_tag != csum) {
1757                         printk(KERN_ERR "%s: GUARD check failed on sector %lu" \
1758                                " rcvd 0x%04x, data 0x%04x\n", __func__,
1759                                (unsigned long)sector,
1760                                be16_to_cpu(sdt[i].guard_tag),
1761                                be16_to_cpu(csum));
1762                         dif_errors++;
1763                         return 0x01;
1764                 }
1765
1766                 if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1767                     be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) {
1768                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1769                                __func__, (unsigned long)sector);
1770                         dif_errors++;
1771                         return 0x03;
1772                 }
1773
1774                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1775                     be32_to_cpu(sdt[i].ref_tag) != ei_lba) {
1776                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1777                                __func__, (unsigned long)sector);
1778                         dif_errors++;
1779                         return 0x03;
1780                 }
1781
1782                 ei_lba++;
1783         }
1784
1785         resid = sectors * 8; /* Bytes of protection data to copy into sgl */
1786         sector = start_sec;
1787
1788         scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
1789                 int len = min(psgl->length, resid);
1790
1791                 paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
1792                 memcpy(paddr, dif_storep + dif_offset(sector), len);
1793
1794                 sector += len >> 3;
1795                 if (sector >= sdebug_store_sectors) {
1796                         /* Force wrap */
1797                         tmp_sec = sector;
1798                         sector = do_div(tmp_sec, sdebug_store_sectors);
1799                 }
1800                 resid -= len;
1801                 kunmap_atomic(paddr);
1802         }
1803
1804         dix_reads++;
1805
1806         return 0;
1807 }
1808
1809 static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
1810                      unsigned int num, struct sdebug_dev_info *devip,
1811                      u32 ei_lba)
1812 {
1813         unsigned long iflags;
1814         int ret;
1815
1816         ret = check_device_access_params(devip, lba, num);
1817         if (ret)
1818                 return ret;
1819
1820         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
1821             (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) &&
1822             ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
1823                 /* claim unrecoverable read error */
1824                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0);
1825                 /* set info field and valid bit for fixed descriptor */
1826                 if (0x70 == (devip->sense_buff[0] & 0x7f)) {
1827                         devip->sense_buff[0] |= 0x80;   /* Valid bit */
1828                         ret = (lba < OPT_MEDIUM_ERR_ADDR)
1829                               ? OPT_MEDIUM_ERR_ADDR : (int)lba;
1830                         devip->sense_buff[3] = (ret >> 24) & 0xff;
1831                         devip->sense_buff[4] = (ret >> 16) & 0xff;
1832                         devip->sense_buff[5] = (ret >> 8) & 0xff;
1833                         devip->sense_buff[6] = ret & 0xff;
1834                 }
1835                 scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
1836                 return check_condition_result;
1837         }
1838
1839         /* DIX + T10 DIF */
1840         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
1841                 int prot_ret = prot_verify_read(SCpnt, lba, num, ei_lba);
1842
1843                 if (prot_ret) {
1844                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, prot_ret);
1845                         return illegal_condition_result;
1846                 }
1847         }
1848
1849         read_lock_irqsave(&atomic_rw, iflags);
1850         ret = do_device_access(SCpnt, devip, lba, num, 0);
1851         read_unlock_irqrestore(&atomic_rw, iflags);
1852         return ret;
1853 }
1854
1855 void dump_sector(unsigned char *buf, int len)
1856 {
1857         int i, j;
1858
1859         printk(KERN_ERR ">>> Sector Dump <<<\n");
1860
1861         for (i = 0 ; i < len ; i += 16) {
1862                 printk(KERN_ERR "%04d: ", i);
1863
1864                 for (j = 0 ; j < 16 ; j++) {
1865                         unsigned char c = buf[i+j];
1866                         if (c >= 0x20 && c < 0x7e)
1867                                 printk(" %c ", buf[i+j]);
1868                         else
1869                                 printk("%02x ", buf[i+j]);
1870                 }
1871
1872                 printk("\n");
1873         }
1874 }
1875
1876 static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
1877                              unsigned int sectors, u32 ei_lba)
1878 {
1879         int i, j, ret;
1880         struct sd_dif_tuple *sdt;
1881         struct scatterlist *dsgl = scsi_sglist(SCpnt);
1882         struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
1883         void *daddr, *paddr;
1884         sector_t tmp_sec = start_sec;
1885         sector_t sector;
1886         int ppage_offset;
1887         unsigned short csum;
1888
1889         sector = do_div(tmp_sec, sdebug_store_sectors);
1890
1891         BUG_ON(scsi_sg_count(SCpnt) == 0);
1892         BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
1893
1894         paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
1895         ppage_offset = 0;
1896
1897         /* For each data page */
1898         scsi_for_each_sg(SCpnt, dsgl, scsi_sg_count(SCpnt), i) {
1899                 daddr = kmap_atomic(sg_page(dsgl)) + dsgl->offset;
1900
1901                 /* For each sector-sized chunk in data page */
1902                 for (j = 0 ; j < dsgl->length ; j += scsi_debug_sector_size) {
1903
1904                         /* If we're at the end of the current
1905                          * protection page advance to the next one
1906                          */
1907                         if (ppage_offset >= psgl->length) {
1908                                 kunmap_atomic(paddr);
1909                                 psgl = sg_next(psgl);
1910                                 BUG_ON(psgl == NULL);
1911                                 paddr = kmap_atomic(sg_page(psgl))
1912                                         + psgl->offset;
1913                                 ppage_offset = 0;
1914                         }
1915
1916                         sdt = paddr + ppage_offset;
1917
1918                         switch (scsi_debug_guard) {
1919                         case 1:
1920                                 csum = ip_compute_csum(daddr,
1921                                                        scsi_debug_sector_size);
1922                                 break;
1923                         case 0:
1924                                 csum = cpu_to_be16(crc_t10dif(daddr,
1925                                                       scsi_debug_sector_size));
1926                                 break;
1927                         default:
1928                                 BUG();
1929                                 ret = 0;
1930                                 goto out;
1931                         }
1932
1933                         if (sdt->guard_tag != csum) {
1934                                 printk(KERN_ERR
1935                                        "%s: GUARD check failed on sector %lu " \
1936                                        "rcvd 0x%04x, calculated 0x%04x\n",
1937                                        __func__, (unsigned long)sector,
1938                                        be16_to_cpu(sdt->guard_tag),
1939                                        be16_to_cpu(csum));
1940                                 ret = 0x01;
1941                                 dump_sector(daddr, scsi_debug_sector_size);
1942                                 goto out;
1943                         }
1944
1945                         if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1946                             be32_to_cpu(sdt->ref_tag)
1947                             != (start_sec & 0xffffffff)) {
1948                                 printk(KERN_ERR
1949                                        "%s: REF check failed on sector %lu\n",
1950                                        __func__, (unsigned long)sector);
1951                                 ret = 0x03;
1952                                 dump_sector(daddr, scsi_debug_sector_size);
1953                                 goto out;
1954                         }
1955
1956                         if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1957                             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1958                                 printk(KERN_ERR
1959                                        "%s: REF check failed on sector %lu\n",
1960                                        __func__, (unsigned long)sector);
1961                                 ret = 0x03;
1962                                 dump_sector(daddr, scsi_debug_sector_size);
1963                                 goto out;
1964                         }
1965
1966                         /* Would be great to copy this in bigger
1967                          * chunks.  However, for the sake of
1968                          * correctness we need to verify each sector
1969                          * before writing it to "stable" storage
1970                          */
1971                         memcpy(dif_storep + dif_offset(sector), sdt, 8);
1972
1973                         sector++;
1974
1975                         if (sector == sdebug_store_sectors)
1976                                 sector = 0;     /* Force wrap */
1977
1978                         start_sec++;
1979                         ei_lba++;
1980                         daddr += scsi_debug_sector_size;
1981                         ppage_offset += sizeof(struct sd_dif_tuple);
1982                 }
1983
1984                 kunmap_atomic(daddr);
1985         }
1986
1987         kunmap_atomic(paddr);
1988
1989         dix_writes++;
1990
1991         return 0;
1992
1993 out:
1994         dif_errors++;
1995         kunmap_atomic(daddr);
1996         kunmap_atomic(paddr);
1997         return ret;
1998 }
1999
2000 static unsigned int map_state(sector_t lba, unsigned int *num)
2001 {
2002         unsigned int granularity, alignment, mapped;
2003         sector_t block, next, end;
2004
2005         granularity = scsi_debug_unmap_granularity;
2006         alignment = granularity - scsi_debug_unmap_alignment;
2007         block = lba + alignment;
2008         do_div(block, granularity);
2009
2010         mapped = test_bit(block, map_storep);
2011
2012         if (mapped)
2013                 next = find_next_zero_bit(map_storep, map_size, block);
2014         else
2015                 next = find_next_bit(map_storep, map_size, block);
2016
2017         end = next * granularity - scsi_debug_unmap_alignment;
2018         *num = end - lba;
2019
2020         return mapped;
2021 }
2022
2023 static void map_region(sector_t lba, unsigned int len)
2024 {
2025         unsigned int granularity, alignment;
2026         sector_t end = lba + len;
2027
2028         granularity = scsi_debug_unmap_granularity;
2029         alignment = granularity - scsi_debug_unmap_alignment;
2030
2031         while (lba < end) {
2032                 sector_t block, rem;
2033
2034                 block = lba + alignment;
2035                 rem = do_div(block, granularity);
2036
2037                 if (block < map_size)
2038                         set_bit(block, map_storep);
2039
2040                 lba += granularity - rem;
2041         }
2042 }
2043
2044 static void unmap_region(sector_t lba, unsigned int len)
2045 {
2046         unsigned int granularity, alignment;
2047         sector_t end = lba + len;
2048
2049         granularity = scsi_debug_unmap_granularity;
2050         alignment = granularity - scsi_debug_unmap_alignment;
2051
2052         while (lba < end) {
2053                 sector_t block, rem;
2054
2055                 block = lba + alignment;
2056                 rem = do_div(block, granularity);
2057
2058                 if (rem == 0 && lba + granularity < end && block < map_size) {
2059                         clear_bit(block, map_storep);
2060                         if (scsi_debug_lbprz)
2061                                 memset(fake_storep +
2062                                        lba * scsi_debug_sector_size, 0,
2063                                        scsi_debug_sector_size *
2064                                        scsi_debug_unmap_granularity);
2065                 }
2066                 lba += granularity - rem;
2067         }
2068 }
2069
2070 static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
2071                       unsigned int num, struct sdebug_dev_info *devip,
2072                       u32 ei_lba)
2073 {
2074         unsigned long iflags;
2075         int ret;
2076
2077         ret = check_device_access_params(devip, lba, num);
2078         if (ret)
2079                 return ret;
2080
2081         /* DIX + T10 DIF */
2082         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
2083                 int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
2084
2085                 if (prot_ret) {
2086                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
2087                         return illegal_condition_result;
2088                 }
2089         }
2090
2091         write_lock_irqsave(&atomic_rw, iflags);
2092         ret = do_device_access(SCpnt, devip, lba, num, 1);
2093         if (scsi_debug_lbp())
2094                 map_region(lba, num);
2095         write_unlock_irqrestore(&atomic_rw, iflags);
2096         if (-1 == ret)
2097                 return (DID_ERROR << 16);
2098         else if ((ret < (num * scsi_debug_sector_size)) &&
2099                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2100                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
2101                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2102
2103         return 0;
2104 }
2105
2106 static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
2107                       unsigned int num, struct sdebug_dev_info *devip,
2108                            u32 ei_lba, unsigned int unmap)
2109 {
2110         unsigned long iflags;
2111         unsigned long long i;
2112         int ret;
2113
2114         ret = check_device_access_params(devip, lba, num);
2115         if (ret)
2116                 return ret;
2117
2118         if (num > scsi_debug_write_same_length) {
2119                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2120                                 0);
2121                 return check_condition_result;
2122         }
2123
2124         write_lock_irqsave(&atomic_rw, iflags);
2125
2126         if (unmap && scsi_debug_lbp()) {
2127                 unmap_region(lba, num);
2128                 goto out;
2129         }
2130
2131         /* Else fetch one logical block */
2132         ret = fetch_to_dev_buffer(scmd,
2133                                   fake_storep + (lba * scsi_debug_sector_size),
2134                                   scsi_debug_sector_size);
2135
2136         if (-1 == ret) {
2137                 write_unlock_irqrestore(&atomic_rw, iflags);
2138                 return (DID_ERROR << 16);
2139         } else if ((ret < (num * scsi_debug_sector_size)) &&
2140                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2141                 printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
2142                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2143
2144         /* Copy first sector to remaining blocks */
2145         for (i = 1 ; i < num ; i++)
2146                 memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
2147                        fake_storep + (lba * scsi_debug_sector_size),
2148                        scsi_debug_sector_size);
2149
2150         if (scsi_debug_lbp())
2151                 map_region(lba, num);
2152 out:
2153         write_unlock_irqrestore(&atomic_rw, iflags);
2154
2155         return 0;
2156 }
2157
2158 struct unmap_block_desc {
2159         __be64  lba;
2160         __be32  blocks;
2161         __be32  __reserved;
2162 };
2163
2164 static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
2165 {
2166         unsigned char *buf;
2167         struct unmap_block_desc *desc;
2168         unsigned int i, payload_len, descriptors;
2169         int ret;
2170
2171         ret = check_readiness(scmd, 1, devip);
2172         if (ret)
2173                 return ret;
2174
2175         payload_len = get_unaligned_be16(&scmd->cmnd[7]);
2176         BUG_ON(scsi_bufflen(scmd) != payload_len);
2177
2178         descriptors = (payload_len - 8) / 16;
2179
2180         buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
2181         if (!buf)
2182                 return check_condition_result;
2183
2184         scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
2185
2186         BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
2187         BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
2188
2189         desc = (void *)&buf[8];
2190
2191         for (i = 0 ; i < descriptors ; i++) {
2192                 unsigned long long lba = get_unaligned_be64(&desc[i].lba);
2193                 unsigned int num = get_unaligned_be32(&desc[i].blocks);
2194
2195                 ret = check_device_access_params(devip, lba, num);
2196                 if (ret)
2197                         goto out;
2198
2199                 unmap_region(lba, num);
2200         }
2201
2202         ret = 0;
2203
2204 out:
2205         kfree(buf);
2206
2207         return ret;
2208 }
2209
2210 #define SDEBUG_GET_LBA_STATUS_LEN 32
2211
2212 static int resp_get_lba_status(struct scsi_cmnd * scmd,
2213                                struct sdebug_dev_info * devip)
2214 {
2215         unsigned long long lba;
2216         unsigned int alloc_len, mapped, num;
2217         unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
2218         int ret;
2219
2220         ret = check_readiness(scmd, 1, devip);
2221         if (ret)
2222                 return ret;
2223
2224         lba = get_unaligned_be64(&scmd->cmnd[2]);
2225         alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
2226
2227         if (alloc_len < 24)
2228                 return 0;
2229
2230         ret = check_device_access_params(devip, lba, 1);
2231         if (ret)
2232                 return ret;
2233
2234         mapped = map_state(lba, &num);
2235
2236         memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
2237         put_unaligned_be32(20, &arr[0]);        /* Parameter Data Length */
2238         put_unaligned_be64(lba, &arr[8]);       /* LBA */
2239         put_unaligned_be32(num, &arr[16]);      /* Number of blocks */
2240         arr[20] = !mapped;                      /* mapped = 0, unmapped = 1 */
2241
2242         return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
2243 }
2244
2245 #define SDEBUG_RLUN_ARR_SZ 256
2246
2247 static int resp_report_luns(struct scsi_cmnd * scp,
2248                             struct sdebug_dev_info * devip)
2249 {
2250         unsigned int alloc_len;
2251         int lun_cnt, i, upper, num, n, wlun, lun;
2252         unsigned char *cmd = (unsigned char *)scp->cmnd;
2253         int select_report = (int)cmd[2];
2254         struct scsi_lun *one_lun;
2255         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
2256         unsigned char * max_addr;
2257
2258         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
2259         if ((alloc_len < 4) || (select_report > 2)) {
2260                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2261                                 0);
2262                 return check_condition_result;
2263         }
2264         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
2265         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
2266         lun_cnt = scsi_debug_max_luns;
2267         if (1 == select_report)
2268                 lun_cnt = 0;
2269         else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
2270                 --lun_cnt;
2271         wlun = (select_report > 0) ? 1 : 0;
2272         num = lun_cnt + wlun;
2273         arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
2274         arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
2275         n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
2276                             sizeof(struct scsi_lun)), num);
2277         if (n < num) {
2278                 wlun = 0;
2279                 lun_cnt = n;
2280         }
2281         one_lun = (struct scsi_lun *) &arr[8];
2282         max_addr = arr + SDEBUG_RLUN_ARR_SZ;
2283         for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
2284              ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
2285              i++, lun++) {
2286                 upper = (lun >> 8) & 0x3f;
2287                 if (upper)
2288                         one_lun[i].scsi_lun[0] =
2289                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
2290                 one_lun[i].scsi_lun[1] = lun & 0xff;
2291         }
2292         if (wlun) {
2293                 one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
2294                 one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
2295                 i++;
2296         }
2297         alloc_len = (unsigned char *)(one_lun + i) - arr;
2298         return fill_from_dev_buffer(scp, arr,
2299                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
2300 }
2301
2302 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
2303                             unsigned int num, struct sdebug_dev_info *devip)
2304 {
2305         int i, j, ret = -1;
2306         unsigned char *kaddr, *buf;
2307         unsigned int offset;
2308         struct scatterlist *sg;
2309         struct scsi_data_buffer *sdb = scsi_in(scp);
2310
2311         /* better not to use temporary buffer. */
2312         buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
2313         if (!buf)
2314                 return ret;
2315
2316         scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
2317
2318         offset = 0;
2319         for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
2320                 kaddr = (unsigned char *)kmap_atomic(sg_page(sg));
2321                 if (!kaddr)
2322                         goto out;
2323
2324                 for (j = 0; j < sg->length; j++)
2325                         *(kaddr + sg->offset + j) ^= *(buf + offset + j);
2326
2327                 offset += sg->length;
2328                 kunmap_atomic(kaddr);
2329         }
2330         ret = 0;
2331 out:
2332         kfree(buf);
2333
2334         return ret;
2335 }
2336
2337 /* When timer goes off this function is called. */
2338 static void timer_intr_handler(unsigned long indx)
2339 {
2340         struct sdebug_queued_cmd * sqcp;
2341         unsigned long iflags;
2342
2343         if (indx >= scsi_debug_max_queue) {
2344                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
2345                        "large\n");
2346                 return;
2347         }
2348         spin_lock_irqsave(&queued_arr_lock, iflags);
2349         sqcp = &queued_arr[(int)indx];
2350         if (! sqcp->in_use) {
2351                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
2352                        "interrupt\n");
2353                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2354                 return;
2355         }
2356         sqcp->in_use = 0;
2357         if (sqcp->done_funct) {
2358                 sqcp->a_cmnd->result = sqcp->scsi_result;
2359                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
2360         }
2361         sqcp->done_funct = NULL;
2362         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2363 }
2364
2365
2366 static struct sdebug_dev_info *
2367 sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
2368 {
2369         struct sdebug_dev_info *devip;
2370
2371         devip = kzalloc(sizeof(*devip), flags);
2372         if (devip) {
2373                 devip->sdbg_host = sdbg_host;
2374                 list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
2375         }
2376         return devip;
2377 }
2378
2379 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
2380 {
2381         struct sdebug_host_info * sdbg_host;
2382         struct sdebug_dev_info * open_devip = NULL;
2383         struct sdebug_dev_info * devip =
2384                         (struct sdebug_dev_info *)sdev->hostdata;
2385
2386         if (devip)
2387                 return devip;
2388         sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
2389         if (!sdbg_host) {
2390                 printk(KERN_ERR "Host info NULL\n");
2391                 return NULL;
2392         }
2393         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
2394                 if ((devip->used) && (devip->channel == sdev->channel) &&
2395                     (devip->target == sdev->id) &&
2396                     (devip->lun == sdev->lun))
2397                         return devip;
2398                 else {
2399                         if ((!devip->used) && (!open_devip))
2400                                 open_devip = devip;
2401                 }
2402         }
2403         if (!open_devip) { /* try and make a new one */
2404                 open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
2405                 if (!open_devip) {
2406                         printk(KERN_ERR "%s: out of memory at line %d\n",
2407                                 __func__, __LINE__);
2408                         return NULL;
2409                 }
2410         }
2411
2412         open_devip->channel = sdev->channel;
2413         open_devip->target = sdev->id;
2414         open_devip->lun = sdev->lun;
2415         open_devip->sdbg_host = sdbg_host;
2416         open_devip->reset = 1;
2417         open_devip->used = 1;
2418         memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
2419         if (scsi_debug_dsense)
2420                 open_devip->sense_buff[0] = 0x72;
2421         else {
2422                 open_devip->sense_buff[0] = 0x70;
2423                 open_devip->sense_buff[7] = 0xa;
2424         }
2425         if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
2426                 open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
2427
2428         return open_devip;
2429 }
2430
2431 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
2432 {
2433         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2434                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
2435                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2436         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
2437         return 0;
2438 }
2439
2440 static int scsi_debug_slave_configure(struct scsi_device *sdp)
2441 {
2442         struct sdebug_dev_info *devip;
2443
2444         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2445                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
2446                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2447         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
2448                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
2449         devip = devInfoReg(sdp);
2450         if (NULL == devip)
2451                 return 1;       /* no resources, will be marked offline */
2452         sdp->hostdata = devip;
2453         if (sdp->host->cmd_per_lun)
2454                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
2455                                         sdp->host->cmd_per_lun);
2456         blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
2457         if (scsi_debug_no_uld)
2458                 sdp->no_uld_attach = 1;
2459         return 0;
2460 }
2461
2462 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
2463 {
2464         struct sdebug_dev_info *devip =
2465                 (struct sdebug_dev_info *)sdp->hostdata;
2466
2467         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2468                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
2469                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2470         if (devip) {
2471                 /* make this slot available for re-use */
2472                 devip->used = 0;
2473                 sdp->hostdata = NULL;
2474         }
2475 }
2476
2477 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
2478 static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
2479 {
2480         unsigned long iflags;
2481         int k;
2482         struct sdebug_queued_cmd *sqcp;
2483
2484         spin_lock_irqsave(&queued_arr_lock, iflags);
2485         for (k = 0; k < scsi_debug_max_queue; ++k) {
2486                 sqcp = &queued_arr[k];
2487                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
2488                         del_timer_sync(&sqcp->cmnd_timer);
2489                         sqcp->in_use = 0;
2490                         sqcp->a_cmnd = NULL;
2491                         break;
2492                 }
2493         }
2494         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2495         return (k < scsi_debug_max_queue) ? 1 : 0;
2496 }
2497
2498 /* Deletes (stops) timers of all queued commands */
2499 static void stop_all_queued(void)
2500 {
2501         unsigned long iflags;
2502         int k;
2503         struct sdebug_queued_cmd *sqcp;
2504
2505         spin_lock_irqsave(&queued_arr_lock, iflags);
2506         for (k = 0; k < scsi_debug_max_queue; ++k) {
2507                 sqcp = &queued_arr[k];
2508                 if (sqcp->in_use && sqcp->a_cmnd) {
2509                         del_timer_sync(&sqcp->cmnd_timer);
2510                         sqcp->in_use = 0;
2511                         sqcp->a_cmnd = NULL;
2512                 }
2513         }
2514         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2515 }
2516
2517 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
2518 {
2519         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2520                 printk(KERN_INFO "scsi_debug: abort\n");
2521         ++num_aborts;
2522         stop_queued_cmnd(SCpnt);
2523         return SUCCESS;
2524 }
2525
2526 static int scsi_debug_biosparam(struct scsi_device *sdev,
2527                 struct block_device * bdev, sector_t capacity, int *info)
2528 {
2529         int res;
2530         unsigned char *buf;
2531
2532         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2533                 printk(KERN_INFO "scsi_debug: biosparam\n");
2534         buf = scsi_bios_ptable(bdev);
2535         if (buf) {
2536                 res = scsi_partsize(buf, capacity,
2537                                     &info[2], &info[0], &info[1]);
2538                 kfree(buf);
2539                 if (! res)
2540                         return res;
2541         }
2542         info[0] = sdebug_heads;
2543         info[1] = sdebug_sectors_per;
2544         info[2] = sdebug_cylinders_per;
2545         return 0;
2546 }
2547
2548 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
2549 {
2550         struct sdebug_dev_info * devip;
2551
2552         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2553                 printk(KERN_INFO "scsi_debug: device_reset\n");
2554         ++num_dev_resets;
2555         if (SCpnt) {
2556                 devip = devInfoReg(SCpnt->device);
2557                 if (devip)
2558                         devip->reset = 1;
2559         }
2560         return SUCCESS;
2561 }
2562
2563 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
2564 {
2565         struct sdebug_host_info *sdbg_host;
2566         struct sdebug_dev_info * dev_info;
2567         struct scsi_device * sdp;
2568         struct Scsi_Host * hp;
2569
2570         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2571                 printk(KERN_INFO "scsi_debug: bus_reset\n");
2572         ++num_bus_resets;
2573         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
2574                 sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
2575                 if (sdbg_host) {
2576                         list_for_each_entry(dev_info,
2577                                             &sdbg_host->dev_info_list,
2578                                             dev_list)
2579                                 dev_info->reset = 1;
2580                 }
2581         }
2582         return SUCCESS;
2583 }
2584
2585 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
2586 {
2587         struct sdebug_host_info * sdbg_host;
2588         struct sdebug_dev_info * dev_info;
2589
2590         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2591                 printk(KERN_INFO "scsi_debug: host_reset\n");
2592         ++num_host_resets;
2593         spin_lock(&sdebug_host_list_lock);
2594         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
2595                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
2596                                     dev_list)
2597                         dev_info->reset = 1;
2598         }
2599         spin_unlock(&sdebug_host_list_lock);
2600         stop_all_queued();
2601         return SUCCESS;
2602 }
2603
2604 /* Initializes timers in queued array */
2605 static void __init init_all_queued(void)
2606 {
2607         unsigned long iflags;
2608         int k;
2609         struct sdebug_queued_cmd * sqcp;
2610
2611         spin_lock_irqsave(&queued_arr_lock, iflags);
2612         for (k = 0; k < scsi_debug_max_queue; ++k) {
2613                 sqcp = &queued_arr[k];
2614                 init_timer(&sqcp->cmnd_timer);
2615                 sqcp->in_use = 0;
2616                 sqcp->a_cmnd = NULL;
2617         }
2618         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2619 }
2620
2621 static void __init sdebug_build_parts(unsigned char *ramp,
2622                                       unsigned long store_size)
2623 {
2624         struct partition * pp;
2625         int starts[SDEBUG_MAX_PARTS + 2];
2626         int sectors_per_part, num_sectors, k;
2627         int heads_by_sects, start_sec, end_sec;
2628
2629         /* assume partition table already zeroed */
2630         if ((scsi_debug_num_parts < 1) || (store_size < 1048576))
2631                 return;
2632         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
2633                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
2634                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
2635                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
2636         }
2637         num_sectors = (int)sdebug_store_sectors;
2638         sectors_per_part = (num_sectors - sdebug_sectors_per)
2639                            / scsi_debug_num_parts;
2640         heads_by_sects = sdebug_heads * sdebug_sectors_per;
2641         starts[0] = sdebug_sectors_per;
2642         for (k = 1; k < scsi_debug_num_parts; ++k)
2643                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
2644                             * heads_by_sects;
2645         starts[scsi_debug_num_parts] = num_sectors;
2646         starts[scsi_debug_num_parts + 1] = 0;
2647
2648         ramp[510] = 0x55;       /* magic partition markings */
2649         ramp[511] = 0xAA;
2650         pp = (struct partition *)(ramp + 0x1be);
2651         for (k = 0; starts[k + 1]; ++k, ++pp) {
2652                 start_sec = starts[k];
2653                 end_sec = starts[k + 1] - 1;
2654                 pp->boot_ind = 0;
2655
2656                 pp->cyl = start_sec / heads_by_sects;
2657                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
2658                            / sdebug_sectors_per;
2659                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
2660
2661                 pp->end_cyl = end_sec / heads_by_sects;
2662                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
2663                                / sdebug_sectors_per;
2664                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
2665
2666                 pp->start_sect = start_sec;
2667                 pp->nr_sects = end_sec - start_sec + 1;
2668                 pp->sys_ind = 0x83;     /* plain Linux partition */
2669         }
2670 }
2671
2672 static int schedule_resp(struct scsi_cmnd * cmnd,
2673                          struct sdebug_dev_info * devip,
2674                          done_funct_t done, int scsi_result, int delta_jiff)
2675 {
2676         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
2677                 if (scsi_result) {
2678                         struct scsi_device * sdp = cmnd->device;
2679
2680                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
2681                                "non-zero result=0x%x\n", sdp->host->host_no,
2682                                sdp->channel, sdp->id, sdp->lun, scsi_result);
2683                 }
2684         }
2685         if (cmnd && devip) {
2686                 /* simulate autosense by this driver */
2687                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
2688                         memcpy(cmnd->sense_buffer, devip->sense_buff,
2689                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
2690                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
2691         }
2692         if (delta_jiff <= 0) {
2693                 if (cmnd)
2694                         cmnd->result = scsi_result;
2695                 if (done)
2696                         done(cmnd);
2697                 return 0;
2698         } else {
2699                 unsigned long iflags;
2700                 int k;
2701                 struct sdebug_queued_cmd * sqcp = NULL;
2702
2703                 spin_lock_irqsave(&queued_arr_lock, iflags);
2704                 for (k = 0; k < scsi_debug_max_queue; ++k) {
2705                         sqcp = &queued_arr[k];
2706                         if (! sqcp->in_use)
2707                                 break;
2708                 }
2709                 if (k >= scsi_debug_max_queue) {
2710                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2711                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
2712                         return 1;       /* report busy to mid level */
2713                 }
2714                 sqcp->in_use = 1;
2715                 sqcp->a_cmnd = cmnd;
2716                 sqcp->scsi_result = scsi_result;
2717                 sqcp->done_funct = done;
2718                 sqcp->cmnd_timer.function = timer_intr_handler;
2719                 sqcp->cmnd_timer.data = k;
2720                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
2721                 add_timer(&sqcp->cmnd_timer);
2722                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2723                 if (cmnd)
2724                         cmnd->result = 0;
2725                 return 0;
2726         }
2727 }
2728 /* Note: The following macros create attribute files in the
2729    /sys/module/scsi_debug/parameters directory. Unfortunately this
2730    driver is unaware of a change and cannot trigger auxiliary actions
2731    as it can when the corresponding attribute in the
2732    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
2733  */
2734 module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
2735 module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
2736 module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
2737 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
2738 module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
2739 module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
2740 module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
2741 module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
2742 module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
2743 module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
2744 module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
2745 module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
2746 module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
2747 module_param_named(lbprz, scsi_debug_lbprz, int, S_IRUGO);
2748 module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
2749 module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
2750 module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
2751 module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
2752 module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
2753 module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
2754 module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
2755 module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
2756 module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
2757 module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
2758 module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
2759 module_param_named(removable, scsi_debug_removable, bool, S_IRUGO | S_IWUSR);
2760 module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
2761 module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
2762 module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
2763 module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
2764 module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
2765 module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
2766 module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
2767 module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
2768                    S_IRUGO | S_IWUSR);
2769 module_param_named(write_same_length, scsi_debug_write_same_length, int,
2770                    S_IRUGO | S_IWUSR);
2771
2772 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
2773 MODULE_DESCRIPTION("SCSI debug adapter driver");
2774 MODULE_LICENSE("GPL");
2775 MODULE_VERSION(SCSI_DEBUG_VERSION);
2776
2777 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
2778 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
2779 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
2780 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)");
2781 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
2782 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
2783 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
2784 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
2785 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
2786 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
2787 MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
2788 MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
2789 MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
2790 MODULE_PARM_DESC(lbprz, "unmapped blocks return 0 on read (def=1)");
2791 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
2792 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
2793 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
2794 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
2795 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
2796 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
2797 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
2798 MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
2799 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
2800 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
2801 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
2802 MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
2803 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
2804 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
2805 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
2806 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
2807 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
2808 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
2809 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
2810 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
2811 MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
2812
2813 static char sdebug_info[256];
2814
2815 static const char * scsi_debug_info(struct Scsi_Host * shp)
2816 {
2817         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
2818                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
2819                 scsi_debug_version_date, scsi_debug_dev_size_mb,
2820                 scsi_debug_opts);
2821         return sdebug_info;
2822 }
2823
2824 /* scsi_debug_proc_info
2825  * Used if the driver currently has no own support for /proc/scsi
2826  */
2827 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
2828                                 int length, int inout)
2829 {
2830         int len, pos, begin;
2831         int orig_length;
2832
2833         orig_length = length;
2834
2835         if (inout == 1) {
2836                 char arr[16];
2837                 int minLen = length > 15 ? 15 : length;
2838
2839                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2840                         return -EACCES;
2841                 memcpy(arr, buffer, minLen);
2842                 arr[minLen] = '\0';
2843                 if (1 != sscanf(arr, "%d", &pos))
2844                         return -EINVAL;
2845                 scsi_debug_opts = pos;
2846                 if (scsi_debug_every_nth != 0)
2847                         scsi_debug_cmnd_count = 0;
2848                 return length;
2849         }
2850         begin = 0;
2851         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
2852             "%s [%s]\n"
2853             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
2854             "every_nth=%d(curr:%d)\n"
2855             "delay=%d, max_luns=%d, scsi_level=%d\n"
2856             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
2857             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
2858             "host_resets=%d\ndix_reads=%d dix_writes=%d dif_errors=%d\n",
2859             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
2860             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
2861             scsi_debug_cmnd_count, scsi_debug_delay,
2862             scsi_debug_max_luns, scsi_debug_scsi_level,
2863             scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
2864             sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
2865             num_host_resets, dix_reads, dix_writes, dif_errors);
2866         if (pos < offset) {
2867                 len = 0;
2868                 begin = pos;
2869         }
2870         *start = buffer + (offset - begin);     /* Start of wanted data */
2871         len -= (offset - begin);
2872         if (len > length)
2873                 len = length;
2874         return len;
2875 }
2876
2877 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
2878 {
2879         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
2880 }
2881
2882 static ssize_t sdebug_delay_store(struct device_driver * ddp,
2883                                   const char * buf, size_t count)
2884 {
2885         int delay;
2886         char work[20];
2887
2888         if (1 == sscanf(buf, "%10s", work)) {
2889                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
2890                         scsi_debug_delay = delay;
2891                         return count;
2892                 }
2893         }
2894         return -EINVAL;
2895 }
2896 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
2897             sdebug_delay_store);
2898
2899 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
2900 {
2901         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
2902 }
2903
2904 static ssize_t sdebug_opts_store(struct device_driver * ddp,
2905                                  const char * buf, size_t count)
2906 {
2907         int opts;
2908         char work[20];
2909
2910         if (1 == sscanf(buf, "%10s", work)) {
2911                 if (0 == strnicmp(work,"0x", 2)) {
2912                         if (1 == sscanf(&work[2], "%x", &opts))
2913                                 goto opts_done;
2914                 } else {
2915                         if (1 == sscanf(work, "%d", &opts))
2916                                 goto opts_done;
2917                 }
2918         }
2919         return -EINVAL;
2920 opts_done:
2921         scsi_debug_opts = opts;
2922         scsi_debug_cmnd_count = 0;
2923         return count;
2924 }
2925 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
2926             sdebug_opts_store);
2927
2928 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
2929 {
2930         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
2931 }
2932 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
2933                                   const char * buf, size_t count)
2934 {
2935         int n;
2936
2937         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2938                 scsi_debug_ptype = n;
2939                 return count;
2940         }
2941         return -EINVAL;
2942 }
2943 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
2944
2945 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
2946 {
2947         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
2948 }
2949 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
2950                                   const char * buf, size_t count)
2951 {
2952         int n;
2953
2954         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2955                 scsi_debug_dsense = n;
2956                 return count;
2957         }
2958         return -EINVAL;
2959 }
2960 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
2961             sdebug_dsense_store);
2962
2963 static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)
2964 {
2965         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
2966 }
2967 static ssize_t sdebug_fake_rw_store(struct device_driver * ddp,
2968                                     const char * buf, size_t count)
2969 {
2970         int n;
2971
2972         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2973                 scsi_debug_fake_rw = n;
2974                 return count;
2975         }
2976         return -EINVAL;
2977 }
2978 DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
2979             sdebug_fake_rw_store);
2980
2981 static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
2982 {
2983         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
2984 }
2985 static ssize_t sdebug_no_lun_0_store(struct device_driver * ddp,
2986                                      const char * buf, size_t count)
2987 {
2988         int n;
2989
2990         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2991                 scsi_debug_no_lun_0 = n;
2992                 return count;
2993         }
2994         return -EINVAL;
2995 }
2996 DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
2997             sdebug_no_lun_0_store);
2998
2999 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
3000 {
3001         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
3002 }
3003 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
3004                                      const char * buf, size_t count)
3005 {
3006         int n;
3007
3008         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3009                 scsi_debug_num_tgts = n;
3010                 sdebug_max_tgts_luns();
3011                 return count;
3012         }
3013         return -EINVAL;
3014 }
3015 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
3016             sdebug_num_tgts_store);
3017
3018 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
3019 {
3020         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
3021 }
3022 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
3023
3024 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
3025 {
3026         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
3027 }
3028 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
3029
3030 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
3031 {
3032         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
3033 }
3034 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
3035                                       const char * buf, size_t count)
3036 {
3037         int nth;
3038
3039         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
3040                 scsi_debug_every_nth = nth;
3041                 scsi_debug_cmnd_count = 0;
3042                 return count;
3043         }
3044         return -EINVAL;
3045 }
3046 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
3047             sdebug_every_nth_store);
3048
3049 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
3050 {
3051         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
3052 }
3053 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
3054                                      const char * buf, size_t count)
3055 {
3056         int n;
3057
3058         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3059                 scsi_debug_max_luns = n;
3060                 sdebug_max_tgts_luns();
3061                 return count;
3062         }
3063         return -EINVAL;
3064 }
3065 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
3066             sdebug_max_luns_store);
3067
3068 static ssize_t sdebug_max_queue_show(struct device_driver * ddp, char * buf)
3069 {
3070         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
3071 }
3072 static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
3073                                       const char * buf, size_t count)
3074 {
3075         int n;
3076
3077         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
3078             (n <= SCSI_DEBUG_CANQUEUE)) {
3079                 scsi_debug_max_queue = n;
3080                 return count;
3081         }
3082         return -EINVAL;
3083 }
3084 DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
3085             sdebug_max_queue_store);
3086
3087 static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
3088 {
3089         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
3090 }
3091 DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
3092
3093 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
3094 {
3095         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
3096 }
3097 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
3098
3099 static ssize_t sdebug_virtual_gb_show(struct device_driver * ddp, char * buf)
3100 {
3101         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
3102 }
3103 static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
3104                                        const char * buf, size_t count)
3105 {
3106         int n;
3107
3108         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3109                 scsi_debug_virtual_gb = n;
3110
3111                 sdebug_capacity = get_sdebug_capacity();
3112
3113                 return count;
3114         }
3115         return -EINVAL;
3116 }
3117 DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
3118             sdebug_virtual_gb_store);
3119
3120 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
3121 {
3122         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
3123 }
3124
3125 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
3126                                      const char * buf, size_t count)
3127 {
3128         int delta_hosts;
3129
3130         if (sscanf(buf, "%d", &delta_hosts) != 1)
3131                 return -EINVAL;
3132         if (delta_hosts > 0) {
3133                 do {
3134                         sdebug_add_adapter();
3135                 } while (--delta_hosts);
3136         } else if (delta_hosts < 0) {
3137                 do {
3138                         sdebug_remove_adapter();
3139                 } while (++delta_hosts);
3140         }
3141         return count;
3142 }
3143 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
3144             sdebug_add_host_store);
3145
3146 static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
3147                                           char * buf)
3148 {
3149         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
3150 }
3151 static ssize_t sdebug_vpd_use_hostno_store(struct device_driver * ddp,
3152                                            const char * buf, size_t count)
3153 {
3154         int n;
3155
3156         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3157                 scsi_debug_vpd_use_hostno = n;
3158                 return count;
3159         }
3160         return -EINVAL;
3161 }
3162 DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
3163             sdebug_vpd_use_hostno_store);
3164
3165 static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
3166 {
3167         return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
3168 }
3169 DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
3170
3171 static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
3172 {
3173         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
3174 }
3175 DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
3176
3177 static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
3178 {
3179         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
3180 }
3181 DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
3182
3183 static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
3184 {
3185         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
3186 }
3187 DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
3188
3189 static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
3190 {
3191         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
3192 }
3193 DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
3194
3195 static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
3196 {
3197         ssize_t count;
3198
3199         if (!scsi_debug_lbp())
3200                 return scnprintf(buf, PAGE_SIZE, "0-%u\n",
3201                                  sdebug_store_sectors);
3202
3203         count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
3204
3205         buf[count++] = '\n';
3206         buf[count++] = 0;
3207
3208         return count;
3209 }
3210 DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
3211
3212 static ssize_t sdebug_removable_show(struct device_driver *ddp,
3213                                      char *buf)
3214 {
3215         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_removable ? 1 : 0);
3216 }
3217 static ssize_t sdebug_removable_store(struct device_driver *ddp,
3218                                       const char *buf, size_t count)
3219 {
3220         int n;
3221
3222         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3223                 scsi_debug_removable = (n > 0);
3224                 return count;
3225         }
3226         return -EINVAL;
3227 }
3228 DRIVER_ATTR(removable, S_IRUGO | S_IWUSR, sdebug_removable_show,
3229             sdebug_removable_store);
3230
3231
3232 /* Note: The following function creates attribute files in the
3233    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
3234    files (over those found in the /sys/module/scsi_debug/parameters
3235    directory) is that auxiliary actions can be triggered when an attribute
3236    is changed. For example see: sdebug_add_host_store() above.
3237  */
3238 static int do_create_driverfs_files(void)
3239 {
3240         int ret;
3241
3242         ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3243         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
3244         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3245         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3246         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3247         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3248         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3249         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3250         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3251         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3252         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3253         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3254         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3255         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
3256         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_removable);
3257         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3258         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3259         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3260         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3261         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
3262         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
3263         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
3264         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
3265         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
3266         return ret;
3267 }
3268
3269 static void do_remove_driverfs_files(void)
3270 {
3271         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
3272         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
3273         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
3274         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
3275         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
3276         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3277         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3278         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3279         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3280         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
3281         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3282         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_removable);
3283         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3284         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3285         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3286         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3287         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3288         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3289         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3290         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3291         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3292         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3293         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
3294         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3295 }
3296
3297 struct device *pseudo_primary;
3298
3299 static int __init scsi_debug_init(void)
3300 {
3301         unsigned long sz;
3302         int host_to_add;
3303         int k;
3304         int ret;
3305
3306         switch (scsi_debug_sector_size) {
3307         case  512:
3308         case 1024:
3309         case 2048:
3310         case 4096:
3311                 break;
3312         default:
3313                 printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
3314                        scsi_debug_sector_size);
3315                 return -EINVAL;
3316         }
3317
3318         switch (scsi_debug_dif) {
3319
3320         case SD_DIF_TYPE0_PROTECTION:
3321         case SD_DIF_TYPE1_PROTECTION:
3322         case SD_DIF_TYPE2_PROTECTION:
3323         case SD_DIF_TYPE3_PROTECTION:
3324                 break;
3325
3326         default:
3327                 printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
3328                 return -EINVAL;
3329         }
3330
3331         if (scsi_debug_guard > 1) {
3332                 printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
3333                 return -EINVAL;
3334         }
3335
3336         if (scsi_debug_ato > 1) {
3337                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
3338                 return -EINVAL;
3339         }
3340
3341         if (scsi_debug_physblk_exp > 15) {
3342                 printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
3343                        scsi_debug_physblk_exp);
3344                 return -EINVAL;
3345         }
3346
3347         if (scsi_debug_lowest_aligned > 0x3fff) {
3348                 printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
3349                        scsi_debug_lowest_aligned);
3350                 return -EINVAL;
3351         }
3352
3353         if (scsi_debug_dev_size_mb < 1)
3354                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
3355         sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
3356         sdebug_store_sectors = sz / scsi_debug_sector_size;
3357         sdebug_capacity = get_sdebug_capacity();
3358
3359         /* play around with geometry, don't waste too much on track 0 */
3360         sdebug_heads = 8;
3361         sdebug_sectors_per = 32;
3362         if (scsi_debug_dev_size_mb >= 16)
3363                 sdebug_heads = 32;
3364         else if (scsi_debug_dev_size_mb >= 256)
3365                 sdebug_heads = 64;
3366         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3367                                (sdebug_sectors_per * sdebug_heads);
3368         if (sdebug_cylinders_per >= 1024) {
3369                 /* other LLDs do this; implies >= 1GB ram disk ... */
3370                 sdebug_heads = 255;
3371                 sdebug_sectors_per = 63;
3372                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3373                                (sdebug_sectors_per * sdebug_heads);
3374         }
3375
3376         fake_storep = vmalloc(sz);
3377         if (NULL == fake_storep) {
3378                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
3379                 return -ENOMEM;
3380         }
3381         memset(fake_storep, 0, sz);
3382         if (scsi_debug_num_parts > 0)
3383                 sdebug_build_parts(fake_storep, sz);
3384
3385         if (scsi_debug_dif) {
3386                 int dif_size;
3387
3388                 dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
3389                 dif_storep = vmalloc(dif_size);
3390
3391                 printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
3392                        dif_size, dif_storep);
3393
3394                 if (dif_storep == NULL) {
3395                         printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
3396                         ret = -ENOMEM;
3397                         goto free_vm;
3398                 }
3399
3400                 memset(dif_storep, 0xff, dif_size);
3401         }
3402
3403         /* Logical Block Provisioning */
3404         if (scsi_debug_lbp()) {
3405                 unsigned int map_bytes;
3406
3407                 scsi_debug_unmap_max_blocks =
3408                         clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
3409
3410                 scsi_debug_unmap_max_desc =
3411                         clamp(scsi_debug_unmap_max_desc, 0U, 256U);
3412
3413                 scsi_debug_unmap_granularity =
3414                         clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
3415
3416                 if (scsi_debug_unmap_alignment &&
3417                     scsi_debug_unmap_granularity <=
3418                     scsi_debug_unmap_alignment) {
3419                         printk(KERN_ERR
3420                                "%s: ERR: unmap_granularity <= unmap_alignment\n",
3421                                __func__);
3422                         return -EINVAL;
3423                 }
3424
3425                 map_size = (sdebug_store_sectors / scsi_debug_unmap_granularity);
3426                 map_bytes = map_size >> 3;
3427                 map_storep = vmalloc(map_bytes);
3428
3429                 printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
3430                        map_size);
3431
3432                 if (map_storep == NULL) {
3433                         printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
3434                         ret = -ENOMEM;
3435                         goto free_vm;
3436                 }
3437
3438                 memset(map_storep, 0x0, map_bytes);
3439
3440                 /* Map first 1KB for partition table */
3441                 if (scsi_debug_num_parts)
3442                         map_region(0, 2);
3443         }
3444
3445         pseudo_primary = root_device_register("pseudo_0");
3446         if (IS_ERR(pseudo_primary)) {
3447                 printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
3448                 ret = PTR_ERR(pseudo_primary);
3449                 goto free_vm;
3450         }
3451         ret = bus_register(&pseudo_lld_bus);
3452         if (ret < 0) {
3453                 printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
3454                         ret);
3455                 goto dev_unreg;
3456         }
3457         ret = driver_register(&sdebug_driverfs_driver);
3458         if (ret < 0) {
3459                 printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
3460                         ret);
3461                 goto bus_unreg;
3462         }
3463         ret = do_create_driverfs_files();
3464         if (ret < 0) {
3465                 printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
3466                         ret);
3467                 goto del_files;
3468         }
3469
3470         init_all_queued();
3471
3472         host_to_add = scsi_debug_add_host;
3473         scsi_debug_add_host = 0;
3474
3475         for (k = 0; k < host_to_add; k++) {
3476                 if (sdebug_add_adapter()) {
3477                         printk(KERN_ERR "scsi_debug_init: "
3478                                "sdebug_add_adapter failed k=%d\n", k);
3479                         break;
3480                 }
3481         }
3482
3483         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
3484                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
3485                        scsi_debug_add_host);
3486         }
3487         return 0;
3488
3489 del_files:
3490         do_remove_driverfs_files();
3491         driver_unregister(&sdebug_driverfs_driver);
3492 bus_unreg:
3493         bus_unregister(&pseudo_lld_bus);
3494 dev_unreg:
3495         root_device_unregister(pseudo_primary);
3496 free_vm:
3497         if (map_storep)
3498                 vfree(map_storep);
3499         if (dif_storep)
3500                 vfree(dif_storep);
3501         vfree(fake_storep);
3502
3503         return ret;
3504 }
3505
3506 static void __exit scsi_debug_exit(void)
3507 {
3508         int k = scsi_debug_add_host;
3509
3510         stop_all_queued();
3511         for (; k; k--)
3512                 sdebug_remove_adapter();
3513         do_remove_driverfs_files();
3514         driver_unregister(&sdebug_driverfs_driver);
3515         bus_unregister(&pseudo_lld_bus);
3516         root_device_unregister(pseudo_primary);
3517
3518         if (dif_storep)
3519                 vfree(dif_storep);
3520
3521         vfree(fake_storep);
3522 }
3523
3524 device_initcall(scsi_debug_init);
3525 module_exit(scsi_debug_exit);
3526
3527 static void sdebug_release_adapter(struct device * dev)
3528 {
3529         struct sdebug_host_info *sdbg_host;
3530
3531         sdbg_host = to_sdebug_host(dev);
3532         kfree(sdbg_host);
3533 }
3534
3535 static int sdebug_add_adapter(void)
3536 {
3537         int k, devs_per_host;
3538         int error = 0;
3539         struct sdebug_host_info *sdbg_host;
3540         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3541
3542         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
3543         if (NULL == sdbg_host) {
3544                 printk(KERN_ERR "%s: out of memory at line %d\n",
3545                        __func__, __LINE__);
3546                 return -ENOMEM;
3547         }
3548
3549         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
3550
3551         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
3552         for (k = 0; k < devs_per_host; k++) {
3553                 sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
3554                 if (!sdbg_devinfo) {
3555                         printk(KERN_ERR "%s: out of memory at line %d\n",
3556                                __func__, __LINE__);
3557                         error = -ENOMEM;
3558                         goto clean;
3559                 }
3560         }
3561
3562         spin_lock(&sdebug_host_list_lock);
3563         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
3564         spin_unlock(&sdebug_host_list_lock);
3565
3566         sdbg_host->dev.bus = &pseudo_lld_bus;
3567         sdbg_host->dev.parent = pseudo_primary;
3568         sdbg_host->dev.release = &sdebug_release_adapter;
3569         dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
3570
3571         error = device_register(&sdbg_host->dev);
3572
3573         if (error)
3574                 goto clean;
3575
3576         ++scsi_debug_add_host;
3577         return error;
3578
3579 clean:
3580         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
3581                                  dev_list) {
3582                 list_del(&sdbg_devinfo->dev_list);
3583                 kfree(sdbg_devinfo);
3584         }
3585
3586         kfree(sdbg_host);
3587         return error;
3588 }
3589
3590 static void sdebug_remove_adapter(void)
3591 {
3592         struct sdebug_host_info * sdbg_host = NULL;
3593
3594         spin_lock(&sdebug_host_list_lock);
3595         if (!list_empty(&sdebug_host_list)) {
3596                 sdbg_host = list_entry(sdebug_host_list.prev,
3597                                        struct sdebug_host_info, host_list);
3598                 list_del(&sdbg_host->host_list);
3599         }
3600         spin_unlock(&sdebug_host_list_lock);
3601
3602         if (!sdbg_host)
3603                 return;
3604
3605         device_unregister(&sdbg_host->dev);
3606         --scsi_debug_add_host;
3607 }
3608
3609 static
3610 int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
3611 {
3612         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
3613         int len, k;
3614         unsigned int num;
3615         unsigned long long lba;
3616         u32 ei_lba;
3617         int errsts = 0;
3618         int target = SCpnt->device->id;
3619         struct sdebug_dev_info *devip = NULL;
3620         int inj_recovered = 0;
3621         int inj_transport = 0;
3622         int inj_dif = 0;
3623         int inj_dix = 0;
3624         int delay_override = 0;
3625         int unmap = 0;
3626
3627         scsi_set_resid(SCpnt, 0);
3628         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
3629                 printk(KERN_INFO "scsi_debug: cmd ");
3630                 for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
3631                         printk("%02x ", (int)cmd[k]);
3632                 printk("\n");
3633         }
3634
3635         if (target == SCpnt->device->host->hostt->this_id) {
3636                 printk(KERN_INFO "scsi_debug: initiator's id used as "
3637                        "target!\n");
3638                 return schedule_resp(SCpnt, NULL, done,
3639                                      DID_NO_CONNECT << 16, 0);
3640         }
3641
3642         if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
3643             (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
3644                 return schedule_resp(SCpnt, NULL, done,
3645                                      DID_NO_CONNECT << 16, 0);
3646         devip = devInfoReg(SCpnt->device);
3647         if (NULL == devip)
3648                 return schedule_resp(SCpnt, NULL, done,
3649                                      DID_NO_CONNECT << 16, 0);
3650
3651         if ((scsi_debug_every_nth != 0) &&
3652             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
3653                 scsi_debug_cmnd_count = 0;
3654                 if (scsi_debug_every_nth < -1)
3655                         scsi_debug_every_nth = -1;
3656                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
3657                         return 0; /* ignore command causing timeout */
3658                 else if (SCSI_DEBUG_OPT_MAC_TIMEOUT & scsi_debug_opts &&
3659                          scsi_medium_access_command(SCpnt))
3660                         return 0; /* time out reads and writes */
3661                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
3662                         inj_recovered = 1; /* to reads and writes below */
3663                 else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
3664                         inj_transport = 1; /* to reads and writes below */
3665                 else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
3666                         inj_dif = 1; /* to reads and writes below */
3667                 else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
3668                         inj_dix = 1; /* to reads and writes below */
3669         }
3670
3671         if (devip->wlun) {
3672                 switch (*cmd) {
3673                 case INQUIRY:
3674                 case REQUEST_SENSE:
3675                 case TEST_UNIT_READY:
3676                 case REPORT_LUNS:
3677                         break;  /* only allowable wlun commands */
3678                 default:
3679                         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3680                                 printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
3681                                        "not supported for wlun\n", *cmd);
3682                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3683                                         INVALID_OPCODE, 0);
3684                         errsts = check_condition_result;
3685                         return schedule_resp(SCpnt, devip, done, errsts,
3686                                              0);
3687                 }
3688         }
3689
3690         switch (*cmd) {
3691         case INQUIRY:     /* mandatory, ignore unit attention */
3692                 delay_override = 1;
3693                 errsts = resp_inquiry(SCpnt, target, devip);
3694                 break;
3695         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
3696                 delay_override = 1;
3697                 errsts = resp_requests(SCpnt, devip);
3698                 break;
3699         case REZERO_UNIT:       /* actually this is REWIND for SSC */
3700         case START_STOP:
3701                 errsts = resp_start_stop(SCpnt, devip);
3702                 break;
3703         case ALLOW_MEDIUM_REMOVAL:
3704                 errsts = check_readiness(SCpnt, 1, devip);
3705                 if (errsts)
3706                         break;
3707                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3708                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
3709                                cmd[4] ? "inhibited" : "enabled");
3710                 break;
3711         case SEND_DIAGNOSTIC:     /* mandatory */
3712                 errsts = check_readiness(SCpnt, 1, devip);
3713                 break;
3714         case TEST_UNIT_READY:     /* mandatory */
3715                 delay_override = 1;
3716                 errsts = check_readiness(SCpnt, 0, devip);
3717                 break;
3718         case RESERVE:
3719                 errsts = check_readiness(SCpnt, 1, devip);
3720                 break;
3721         case RESERVE_10:
3722                 errsts = check_readiness(SCpnt, 1, devip);
3723                 break;
3724         case RELEASE:
3725                 errsts = check_readiness(SCpnt, 1, devip);
3726                 break;
3727         case RELEASE_10:
3728                 errsts = check_readiness(SCpnt, 1, devip);
3729                 break;
3730         case READ_CAPACITY:
3731                 errsts = resp_readcap(SCpnt, devip);
3732                 break;
3733         case SERVICE_ACTION_IN:
3734                 if (cmd[1] == SAI_READ_CAPACITY_16)
3735                         errsts = resp_readcap16(SCpnt, devip);
3736                 else if (cmd[1] == SAI_GET_LBA_STATUS) {
3737
3738                         if (scsi_debug_lbp() == 0) {
3739                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3740                                                 INVALID_COMMAND_OPCODE, 0);
3741                                 errsts = check_condition_result;
3742                         } else
3743                                 errsts = resp_get_lba_status(SCpnt, devip);
3744                 } else {
3745                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3746                                         INVALID_OPCODE, 0);
3747                         errsts = check_condition_result;
3748                 }
3749                 break;
3750         case MAINTENANCE_IN:
3751                 if (MI_REPORT_TARGET_PGS != cmd[1]) {
3752                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3753                                         INVALID_OPCODE, 0);
3754                         errsts = check_condition_result;
3755                         break;
3756                 }
3757                 errsts = resp_report_tgtpgs(SCpnt, devip);
3758                 break;
3759         case READ_16:
3760         case READ_12:
3761         case READ_10:
3762                 /* READ{10,12,16} and DIF Type 2 are natural enemies */
3763                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3764                     cmd[1] & 0xe0) {
3765                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3766                                         INVALID_COMMAND_OPCODE, 0);
3767                         errsts = check_condition_result;
3768                         break;
3769                 }
3770
3771                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3772                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3773                     (cmd[1] & 0xe0) == 0)
3774                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3775
3776                 /* fall through */
3777         case READ_6:
3778 read:
3779                 errsts = check_readiness(SCpnt, 0, devip);
3780                 if (errsts)
3781                         break;
3782                 if (scsi_debug_fake_rw)
3783                         break;
3784                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3785                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3786                 if (inj_recovered && (0 == errsts)) {
3787                         mk_sense_buffer(devip, RECOVERED_ERROR,
3788                                         THRESHOLD_EXCEEDED, 0);
3789                         errsts = check_condition_result;
3790                 } else if (inj_transport && (0 == errsts)) {
3791                         mk_sense_buffer(devip, ABORTED_COMMAND,
3792                                         TRANSPORT_PROBLEM, ACK_NAK_TO);
3793                         errsts = check_condition_result;
3794                 } else if (inj_dif && (0 == errsts)) {
3795                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3796                         errsts = illegal_condition_result;
3797                 } else if (inj_dix && (0 == errsts)) {
3798                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3799                         errsts = illegal_condition_result;
3800                 }
3801                 break;
3802         case REPORT_LUNS:       /* mandatory, ignore unit attention */
3803                 delay_override = 1;
3804                 errsts = resp_report_luns(SCpnt, devip);
3805                 break;
3806         case VERIFY:            /* 10 byte SBC-2 command */
3807                 errsts = check_readiness(SCpnt, 0, devip);
3808                 break;
3809         case WRITE_16:
3810         case WRITE_12:
3811         case WRITE_10:
3812                 /* WRITE{10,12,16} and DIF Type 2 are natural enemies */
3813                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3814                     cmd[1] & 0xe0) {
3815                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3816                                         INVALID_COMMAND_OPCODE, 0);
3817                         errsts = check_condition_result;
3818                         break;
3819                 }
3820
3821                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3822                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3823                     (cmd[1] & 0xe0) == 0)
3824                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3825
3826                 /* fall through */
3827         case WRITE_6:
3828 write:
3829                 errsts = check_readiness(SCpnt, 0, devip);
3830                 if (errsts)
3831                         break;
3832                 if (scsi_debug_fake_rw)
3833                         break;
3834                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3835                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3836                 if (inj_recovered && (0 == errsts)) {
3837                         mk_sense_buffer(devip, RECOVERED_ERROR,
3838                                         THRESHOLD_EXCEEDED, 0);
3839                         errsts = check_condition_result;
3840                 } else if (inj_dif && (0 == errsts)) {
3841                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3842                         errsts = illegal_condition_result;
3843                 } else if (inj_dix && (0 == errsts)) {
3844                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3845                         errsts = illegal_condition_result;
3846                 }
3847                 break;
3848         case WRITE_SAME_16:
3849         case WRITE_SAME:
3850                 if (cmd[1] & 0x8) {
3851                         if ((*cmd == WRITE_SAME_16 && scsi_debug_lbpws == 0) ||
3852                             (*cmd == WRITE_SAME && scsi_debug_lbpws10 == 0)) {
3853                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3854                                                 INVALID_FIELD_IN_CDB, 0);
3855                                 errsts = check_condition_result;
3856                         } else
3857                                 unmap = 1;
3858                 }
3859                 if (errsts)
3860                         break;
3861                 errsts = check_readiness(SCpnt, 0, devip);
3862                 if (errsts)
3863                         break;
3864                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3865                 errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
3866                 break;
3867         case UNMAP:
3868                 errsts = check_readiness(SCpnt, 0, devip);
3869                 if (errsts)
3870                         break;
3871
3872                 if (scsi_debug_unmap_max_desc == 0 || scsi_debug_lbpu == 0) {
3873                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3874                                         INVALID_COMMAND_OPCODE, 0);
3875                         errsts = check_condition_result;
3876                 } else
3877                         errsts = resp_unmap(SCpnt, devip);
3878                 break;
3879         case MODE_SENSE:
3880         case MODE_SENSE_10:
3881                 errsts = resp_mode_sense(SCpnt, target, devip);
3882                 break;
3883         case MODE_SELECT:
3884                 errsts = resp_mode_select(SCpnt, 1, devip);
3885                 break;
3886         case MODE_SELECT_10:
3887                 errsts = resp_mode_select(SCpnt, 0, devip);
3888                 break;
3889         case LOG_SENSE:
3890                 errsts = resp_log_sense(SCpnt, devip);
3891                 break;
3892         case SYNCHRONIZE_CACHE:
3893                 delay_override = 1;
3894                 errsts = check_readiness(SCpnt, 0, devip);
3895                 break;
3896         case WRITE_BUFFER:
3897                 errsts = check_readiness(SCpnt, 1, devip);
3898                 break;
3899         case XDWRITEREAD_10:
3900                 if (!scsi_bidi_cmnd(SCpnt)) {
3901                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3902                                         INVALID_FIELD_IN_CDB, 0);
3903                         errsts = check_condition_result;
3904                         break;
3905                 }
3906
3907                 errsts = check_readiness(SCpnt, 0, devip);
3908                 if (errsts)
3909                         break;
3910                 if (scsi_debug_fake_rw)
3911                         break;
3912                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3913                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3914                 if (errsts)
3915                         break;
3916                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3917                 if (errsts)
3918                         break;
3919                 errsts = resp_xdwriteread(SCpnt, lba, num, devip);
3920                 break;
3921         case VARIABLE_LENGTH_CMD:
3922                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
3923
3924                         if ((cmd[10] & 0xe0) == 0)
3925                                 printk(KERN_ERR
3926                                        "Unprotected RD/WR to DIF device\n");
3927
3928                         if (cmd[9] == READ_32) {
3929                                 BUG_ON(SCpnt->cmd_len < 32);
3930                                 goto read;
3931                         }
3932
3933                         if (cmd[9] == WRITE_32) {
3934                                 BUG_ON(SCpnt->cmd_len < 32);
3935                                 goto write;
3936                         }
3937                 }
3938
3939                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3940                                 INVALID_FIELD_IN_CDB, 0);
3941                 errsts = check_condition_result;
3942                 break;
3943
3944         default:
3945                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3946                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
3947                                "supported\n", *cmd);
3948                 errsts = check_readiness(SCpnt, 1, devip);
3949                 if (errsts)
3950                         break;  /* Unit attention takes precedence */
3951                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
3952                 errsts = check_condition_result;
3953                 break;
3954         }
3955         return schedule_resp(SCpnt, devip, done, errsts,
3956                              (delay_override ? 0 : scsi_debug_delay));
3957 }
3958
3959 static DEF_SCSI_QCMD(scsi_debug_queuecommand)
3960
3961 static struct scsi_host_template sdebug_driver_template = {
3962         .proc_info =            scsi_debug_proc_info,
3963         .proc_name =            sdebug_proc_name,
3964         .name =                 "SCSI DEBUG",
3965         .info =                 scsi_debug_info,
3966         .slave_alloc =          scsi_debug_slave_alloc,
3967         .slave_configure =      scsi_debug_slave_configure,
3968         .slave_destroy =        scsi_debug_slave_destroy,
3969         .ioctl =                scsi_debug_ioctl,
3970         .queuecommand =         scsi_debug_queuecommand,
3971         .eh_abort_handler =     scsi_debug_abort,
3972         .eh_bus_reset_handler = scsi_debug_bus_reset,
3973         .eh_device_reset_handler = scsi_debug_device_reset,
3974         .eh_host_reset_handler = scsi_debug_host_reset,
3975         .bios_param =           scsi_debug_biosparam,
3976         .can_queue =            SCSI_DEBUG_CANQUEUE,
3977         .this_id =              7,
3978         .sg_tablesize =         256,
3979         .cmd_per_lun =          16,
3980         .max_sectors =          0xffff,
3981         .use_clustering =       DISABLE_CLUSTERING,
3982         .module =               THIS_MODULE,
3983 };
3984
3985 static int sdebug_driver_probe(struct device * dev)
3986 {
3987         int error = 0;
3988         struct sdebug_host_info *sdbg_host;
3989         struct Scsi_Host *hpnt;
3990         int host_prot;
3991
3992         sdbg_host = to_sdebug_host(dev);
3993
3994         sdebug_driver_template.can_queue = scsi_debug_max_queue;
3995         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
3996         if (NULL == hpnt) {
3997                 printk(KERN_ERR "%s: scsi_register failed\n", __func__);
3998                 error = -ENODEV;
3999                 return error;
4000         }
4001
4002         sdbg_host->shost = hpnt;
4003         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
4004         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
4005                 hpnt->max_id = scsi_debug_num_tgts + 1;
4006         else
4007                 hpnt->max_id = scsi_debug_num_tgts;
4008         hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;  /* = scsi_debug_max_luns; */
4009
4010         host_prot = 0;
4011
4012         switch (scsi_debug_dif) {
4013
4014         case SD_DIF_TYPE1_PROTECTION:
4015                 host_prot = SHOST_DIF_TYPE1_PROTECTION;
4016                 if (scsi_debug_dix)
4017                         host_prot |= SHOST_DIX_TYPE1_PROTECTION;
4018                 break;
4019
4020         case SD_DIF_TYPE2_PROTECTION:
4021                 host_prot = SHOST_DIF_TYPE2_PROTECTION;
4022                 if (scsi_debug_dix)
4023                         host_prot |= SHOST_DIX_TYPE2_PROTECTION;
4024                 break;
4025
4026         case SD_DIF_TYPE3_PROTECTION:
4027                 host_prot = SHOST_DIF_TYPE3_PROTECTION;
4028                 if (scsi_debug_dix)
4029                         host_prot |= SHOST_DIX_TYPE3_PROTECTION;
4030                 break;
4031
4032         default:
4033                 if (scsi_debug_dix)
4034                         host_prot |= SHOST_DIX_TYPE0_PROTECTION;
4035                 break;
4036         }
4037
4038         scsi_host_set_prot(hpnt, host_prot);
4039
4040         printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
4041                (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
4042                (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
4043                (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
4044                (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
4045                (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
4046                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
4047                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
4048
4049         if (scsi_debug_guard == 1)
4050                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
4051         else
4052                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
4053
4054         error = scsi_add_host(hpnt, &sdbg_host->dev);
4055         if (error) {
4056                 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
4057                 error = -ENODEV;
4058                 scsi_host_put(hpnt);
4059         } else
4060                 scsi_scan_host(hpnt);
4061
4062
4063         return error;
4064 }
4065
4066 static int sdebug_driver_remove(struct device * dev)
4067 {
4068         struct sdebug_host_info *sdbg_host;
4069         struct sdebug_dev_info *sdbg_devinfo, *tmp;
4070
4071         sdbg_host = to_sdebug_host(dev);
4072
4073         if (!sdbg_host) {
4074                 printk(KERN_ERR "%s: Unable to locate host info\n",
4075                        __func__);
4076                 return -ENODEV;
4077         }
4078
4079         scsi_remove_host(sdbg_host->shost);
4080
4081         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
4082                                  dev_list) {
4083                 list_del(&sdbg_devinfo->dev_list);
4084                 kfree(sdbg_devinfo);
4085         }
4086
4087         scsi_host_put(sdbg_host->shost);
4088         return 0;
4089 }
4090
4091 static int pseudo_lld_bus_match(struct device *dev,
4092                                 struct device_driver *dev_driver)
4093 {
4094         return 1;
4095 }
4096
4097 static struct bus_type pseudo_lld_bus = {
4098         .name = "pseudo",
4099         .match = pseudo_lld_bus_match,
4100         .probe = sdebug_driver_probe,
4101         .remove = sdebug_driver_remove,
4102 };