drivers/scsi/scsi_debug.c

   1 /*
   2  *  linux/kernel/scsi_debug.c
   3  * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
   4  *  Copyright (C) 1992  Eric Youngdale
   5  *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
   6  *  to make sure that we are not getting blocks mixed up, and PANIC if
   7  *  anything out of the ordinary is seen.
   8  * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   9  *
  10  *  This version is more generic, simulating a variable number of disk
  11  *  (or disk like devices) sharing a common amount of RAM
  12  *
  13  *
  14  *  For documentation see http://www.torque.net/sg/sdebug26.html
  15  *
  16  *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
  17  *   dpg: work for devfs large number of disks [20010809]
  18  *        forked for lk 2.5 series [20011216, 20020101]
  19  *        use vmalloc() more inquiry+mode_sense [20020302]
  20  *        add timers for delayed responses [20020721]
  21  *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
  22  *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
  23  *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
  24  *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29
  30 #include <linux/kernel.h>
  31 #include <linux/sched.h>
  32 #include <linux/errno.h>
  33 #include <linux/timer.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/smp_lock.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/moduleparam.h>
  43
  44 #include <linux/blkdev.h>
  45 #include "scsi.h"
  46 #include <scsi/scsi_host.h>
  47 #include <scsi/scsicam.h>
  48
  49 #include <linux/stat.h>
  50
  51 #include "scsi_logging.h"
  52 #include "scsi_debug.h"
  53
  54 #define SCSI_DEBUG_VERSION "1.75"
  55 static const char * scsi_debug_version_date = "20050113";
  56
  57 /* Additional Sense Code (ASC) used */
  58 #define NO_ADDED_SENSE 0x0
  59 #define UNRECOVERED_READ_ERR 0x11
  60 #define INVALID_OPCODE 0x20
  61 #define ADDR_OUT_OF_RANGE 0x21
  62 #define INVALID_FIELD_IN_CDB 0x24
  63 #define POWERON_RESET 0x29
  64 #define SAVING_PARAMS_UNSUP 0x39
  65 #define THRESHHOLD_EXCEEDED 0x5d
  66
  67 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
  68
  69 /* Default values for driver parameters */
  70 #define DEF_NUM_HOST   1
  71 #define DEF_NUM_TGTS   1
  72 #define DEF_MAX_LUNS   1
  73 /* With these defaults, this driver will make 1 host with 1 target
  74  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  75  */
  76 #define DEF_DELAY   1
  77 #define DEF_DEV_SIZE_MB   8
  78 #define DEF_EVERY_NTH   0
  79 #define DEF_NUM_PARTS   0
  80 #define DEF_OPTS   0
  81 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
  82 #define DEF_PTYPE   0
  83 #define DEF_D_SENSE   0
  84
  85 /* bit mask values for scsi_debug_opts */
  86 #define SCSI_DEBUG_OPT_NOISE   1
  87 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
  88 #define SCSI_DEBUG_OPT_TIMEOUT   4
  89 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
  90 /* When "every_nth" > 0 then modulo "every_nth" commands:
  91  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
  92  *   - a RECOVERED_ERROR is simulated on successful read and write
  93  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
  94  *
  95  * When "every_nth" < 0 then after "- every_nth" commands:
  96  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
  97  *   - a RECOVERED_ERROR is simulated on successful read and write
  98  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
  99  * This will continue until some other action occurs (e.g. the user
 100  * writing a new value (other than -1 or 1) to every_nth via sysfs).
 101  */
 102
 103 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
 104  * sector on read commands: */
 105 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
 106
 107 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
 108  * or "peripheral device" addressing (value 0) */
 109 #define SAM2_LUN_ADDRESS_METHOD 0
 110
 111 static int scsi_debug_add_host = DEF_NUM_HOST;
 112 static int scsi_debug_delay = DEF_DELAY;
 113 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
 114 static int scsi_debug_every_nth = DEF_EVERY_NTH;
 115 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 116 static int scsi_debug_num_parts = DEF_NUM_PARTS;
 117 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
 118 static int scsi_debug_opts = DEF_OPTS;
 119 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
 120 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
 121 static int scsi_debug_dsense = DEF_D_SENSE;
 122
 123 static int scsi_debug_cmnd_count = 0;
 124
 125 #define DEV_READONLY(TGT)      (0)
 126 #define DEV_REMOVEABLE(TGT)    (0)
 127
 128 static unsigned long sdebug_store_size; /* in bytes */
 129 static sector_t sdebug_capacity;        /* in sectors */
 130
 131 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
 132    may still need them */
 133 static int sdebug_heads;                /* heads per disk */
 134 static int sdebug_cylinders_per;        /* cylinders per surface */
 135 static int sdebug_sectors_per;          /* sectors per cylinder */
 136
 137 /* default sector size is 512 bytes, 2**9 bytes */
 138 #define POW2_SECT_SIZE 9
 139 #define SECT_SIZE (1 << POW2_SECT_SIZE)
 140 #define SECT_SIZE_PER(TGT) SECT_SIZE
 141
 142 #define SDEBUG_MAX_PARTS 4
 143
 144 #define SDEBUG_SENSE_LEN 32
 145
 146 struct sdebug_dev_info {
 147         struct list_head dev_list;
 148         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
 149         unsigned int channel;
 150         unsigned int target;
 151         unsigned int lun;
 152         struct sdebug_host_info *sdbg_host;
 153         char reset;
 154         char used;
 155 };
 156
 157 struct sdebug_host_info {
 158         struct list_head host_list;
 159         struct Scsi_Host *shost;
 160         struct device dev;
 161         struct list_head dev_info_list;
 162 };
 163
 164 #define to_sdebug_host(d)       \
 165         container_of(d, struct sdebug_host_info, dev)
 166
 167 static LIST_HEAD(sdebug_host_list);
 168 static DEFINE_SPINLOCK(sdebug_host_list_lock);
 169
 170 typedef void (* done_funct_t) (struct scsi_cmnd *);
 171
 172 struct sdebug_queued_cmd {
 173         int in_use;
 174         struct timer_list cmnd_timer;
 175         done_funct_t done_funct;
 176         struct scsi_cmnd * a_cmnd;
 177         int scsi_result;
 178 };
 179 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 180
 181 static struct scsi_host_template sdebug_driver_template = {
 182         .proc_info =            scsi_debug_proc_info,
 183         .name =                 "SCSI DEBUG",
 184         .info =                 scsi_debug_info,
 185         .slave_alloc =          scsi_debug_slave_alloc,
 186         .slave_configure =      scsi_debug_slave_configure,
 187         .slave_destroy =        scsi_debug_slave_destroy,
 188         .ioctl =                scsi_debug_ioctl,
 189         .queuecommand =         scsi_debug_queuecommand,
 190         .eh_abort_handler =     scsi_debug_abort,
 191         .eh_bus_reset_handler = scsi_debug_bus_reset,
 192         .eh_device_reset_handler = scsi_debug_device_reset,
 193         .eh_host_reset_handler = scsi_debug_host_reset,
 194         .bios_param =           scsi_debug_biosparam,
 195         .can_queue =            SCSI_DEBUG_CANQUEUE,
 196         .this_id =              7,
 197         .sg_tablesize =         64,
 198         .cmd_per_lun =          3,
 199         .max_sectors =          4096,
 200         .unchecked_isa_dma =    0,
 201         .use_clustering =       DISABLE_CLUSTERING,
 202         .module =               THIS_MODULE,
 203 };
 204
 205 static unsigned char * fake_storep;     /* ramdisk storage */
 206
 207 static int num_aborts = 0;
 208 static int num_dev_resets = 0;
 209 static int num_bus_resets = 0;
 210 static int num_host_resets = 0;
 211
 212 static DEFINE_SPINLOCK(queued_arr_lock);
 213 static DEFINE_RWLOCK(atomic_rw);
 214
 215 static char sdebug_proc_name[] = "scsi_debug";
 216
 217 static int sdebug_driver_probe(struct device *);
 218 static int sdebug_driver_remove(struct device *);
 219 static struct bus_type pseudo_lld_bus;
 220
 221 static struct device_driver sdebug_driverfs_driver = {
 222         .name           = sdebug_proc_name,
 223         .bus            = &pseudo_lld_bus,
 224         .probe          = sdebug_driver_probe,
 225         .remove         = sdebug_driver_remove,
 226 };
 227
 228 static const int check_condition_result =
 229                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 230
 231 /* function declarations */
 232 static int resp_inquiry(struct scsi_cmnd * SCpnt, int target,
 233                         struct sdebug_dev_info * devip);
 234 static int resp_requests(struct scsi_cmnd * SCpnt,
 235                          struct sdebug_dev_info * devip);
 236 static int resp_readcap(struct scsi_cmnd * SCpnt,
 237                         struct sdebug_dev_info * devip);
 238 static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target,
 239                            struct sdebug_dev_info * devip);
 240 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 241                      int num, struct sdebug_dev_info * devip);
 242 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 243                       int num, struct sdebug_dev_info * devip);
 244 static int resp_report_luns(struct scsi_cmnd * SCpnt,
 245                             struct sdebug_dev_info * devip);
 246 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 247                                 int arr_len);
 248 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 249                                int max_arr_len);
 250 static void timer_intr_handler(unsigned long);
 251 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
 252 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
 253                             int asc, int asq);
 254 static int check_reset(struct scsi_cmnd * SCpnt,
 255                        struct sdebug_dev_info * devip);
 256 static int schedule_resp(struct scsi_cmnd * cmnd,
 257                          struct sdebug_dev_info * devip,
 258                          done_funct_t done, int scsi_result, int delta_jiff);
 259 static void __init sdebug_build_parts(unsigned char * ramp);
 260 static void __init init_all_queued(void);
 261 static void stop_all_queued(void);
 262 static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
 263 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 264                            const char * dev_id_str, int dev_id_str_len);
 265 static void do_create_driverfs_files(void);
 266 static void do_remove_driverfs_files(void);
 267
 268 static int sdebug_add_adapter(void);
 269 static void sdebug_remove_adapter(void);
 270 static void sdebug_max_tgts_luns(void);
 271
 272 static struct device pseudo_primary;
 273 static struct bus_type pseudo_lld_bus;
 274
 275
 276 static
 277 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
 278 {
 279         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
 280         int block, upper_blk, num, k;
 281         int errsts = 0;
 282         int target = scmd_id(SCpnt);
 283         struct sdebug_dev_info * devip = NULL;
 284         int inj_recovered = 0;
 285
 286         if (done == NULL)
 287                 return 0;       /* assume mid level reprocessing command */
 288
 289         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
 290                 printk(KERN_INFO "scsi_debug: cmd ");
 291                 for (k = 0, num = SCpnt->cmd_len; k < num; ++k)
 292                         printk("%02x ", (int)cmd[k]);
 293                 printk("\n");
 294         }
 295         if(target == sdebug_driver_template.this_id) {
 296                 printk(KERN_INFO "scsi_debug: initiator's id used as "
 297                        "target!\n");
 298                 return schedule_resp(SCpnt, NULL, done,
 299                                      DID_NO_CONNECT << 16, 0);
 300         }
 301
 302         if (SCpnt->device->lun >= scsi_debug_max_luns)
 303                 return schedule_resp(SCpnt, NULL, done,
 304                                      DID_NO_CONNECT << 16, 0);
 305         devip = devInfoReg(SCpnt->device);
 306         if (NULL == devip)
 307                 return schedule_resp(SCpnt, NULL, done,
 308                                      DID_NO_CONNECT << 16, 0);
 309
 310         if ((scsi_debug_every_nth != 0) &&
 311             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
 312                 scsi_debug_cmnd_count = 0;
 313                 if (scsi_debug_every_nth < -1)
 314                         scsi_debug_every_nth = -1;
 315                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
 316                         return 0; /* ignore command causing timeout */
 317                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
 318                         inj_recovered = 1; /* to reads and writes below */
 319         }
 320
 321         switch (*cmd) {
 322         case INQUIRY:     /* mandatory, ignore unit attention */
 323                 errsts = resp_inquiry(SCpnt, target, devip);
 324                 break;
 325         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
 326                 errsts = resp_requests(SCpnt, devip);
 327                 break;
 328         case REZERO_UNIT:       /* actually this is REWIND for SSC */
 329         case START_STOP:
 330                 errsts = check_reset(SCpnt, devip);
 331                 break;
 332         case ALLOW_MEDIUM_REMOVAL:
 333                 if ((errsts = check_reset(SCpnt, devip)))
 334                         break;
 335                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 336                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
 337                                 cmd[4] ? "inhibited" : "enabled");
 338                 break;
 339         case SEND_DIAGNOSTIC:     /* mandatory */
 340                 errsts = check_reset(SCpnt, devip);
 341                 break;
 342         case TEST_UNIT_READY:     /* mandatory */
 343                 errsts = check_reset(SCpnt, devip);
 344                 break;
 345         case RESERVE:
 346                 errsts = check_reset(SCpnt, devip);
 347                 break;
 348         case RESERVE_10:
 349                 errsts = check_reset(SCpnt, devip);
 350                 break;
 351         case RELEASE:
 352                 errsts = check_reset(SCpnt, devip);
 353                 break;
 354         case RELEASE_10:
 355                 errsts = check_reset(SCpnt, devip);
 356                 break;
 357         case READ_CAPACITY:
 358                 errsts = resp_readcap(SCpnt, devip);
 359                 break;
 360         case READ_16:
 361         case READ_12:
 362         case READ_10:
 363         case READ_6:
 364                 if ((errsts = check_reset(SCpnt, devip)))
 365                         break;
 366                 upper_blk = 0;
 367                 if ((*cmd) == READ_16) {
 368                         upper_blk = cmd[5] + (cmd[4] << 8) +
 369                                     (cmd[3] << 16) + (cmd[2] << 24);
 370                         block = cmd[9] + (cmd[8] << 8) +
 371                                 (cmd[7] << 16) + (cmd[6] << 24);
 372                         num = cmd[13] + (cmd[12] << 8) +
 373                                 (cmd[11] << 16) + (cmd[10] << 24);
 374                 } else if ((*cmd) == READ_12) {
 375                         block = cmd[5] + (cmd[4] << 8) +
 376                                 (cmd[3] << 16) + (cmd[2] << 24);
 377                         num = cmd[9] + (cmd[8] << 8) +
 378                                 (cmd[7] << 16) + (cmd[6] << 24);
 379                 } else if ((*cmd) == READ_10) {
 380                         block = cmd[5] + (cmd[4] << 8) +
 381                                 (cmd[3] << 16) + (cmd[2] << 24);
 382                         num = cmd[8] + (cmd[7] << 8);
 383                 } else {
 384                         block = cmd[3] + (cmd[2] << 8) +
 385                                 ((cmd[1] & 0x1f) << 16);
 386                         num = cmd[4];
 387                 }
 388                 errsts = resp_read(SCpnt, upper_blk, block, num, devip);
 389                 if (inj_recovered && (0 == errsts)) {
 390                         mk_sense_buffer(devip, RECOVERED_ERROR,
 391                                         THRESHHOLD_EXCEEDED, 0);
 392                         errsts = check_condition_result;
 393                 }
 394                 break;
 395         case REPORT_LUNS:       /* mandatory, ignore unit attention */
 396                 errsts = resp_report_luns(SCpnt, devip);
 397                 break;
 398         case VERIFY:            /* 10 byte SBC-2 command */
 399                 errsts = check_reset(SCpnt, devip);
 400                 break;
 401         case WRITE_16:
 402         case WRITE_12:
 403         case WRITE_10:
 404         case WRITE_6:
 405                 if ((errsts = check_reset(SCpnt, devip)))
 406                         break;
 407                 upper_blk = 0;
 408                 if ((*cmd) == WRITE_16) {
 409                         upper_blk = cmd[5] + (cmd[4] << 8) +
 410                                     (cmd[3] << 16) + (cmd[2] << 24);
 411                         block = cmd[9] + (cmd[8] << 8) +
 412                                 (cmd[7] << 16) + (cmd[6] << 24);
 413                         num = cmd[13] + (cmd[12] << 8) +
 414                                 (cmd[11] << 16) + (cmd[10] << 24);
 415                 } else if ((*cmd) == WRITE_12) {
 416                         block = cmd[5] + (cmd[4] << 8) +
 417                                 (cmd[3] << 16) + (cmd[2] << 24);
 418                         num = cmd[9] + (cmd[8] << 8) +
 419                                 (cmd[7] << 16) + (cmd[6] << 24);
 420                 } else if ((*cmd) == WRITE_10) {
 421                         block = cmd[5] + (cmd[4] << 8) +
 422                                 (cmd[3] << 16) + (cmd[2] << 24);
 423                         num = cmd[8] + (cmd[7] << 8);
 424                 } else {
 425                         block = cmd[3] + (cmd[2] << 8) +
 426                                 ((cmd[1] & 0x1f) << 16);
 427                         num = cmd[4];
 428                 }
 429                 errsts = resp_write(SCpnt, upper_blk, block, num, devip);
 430                 if (inj_recovered && (0 == errsts)) {
 431                         mk_sense_buffer(devip, RECOVERED_ERROR,
 432                                         THRESHHOLD_EXCEEDED, 0);
 433                         errsts = check_condition_result;
 434                 }
 435                 break;
 436         case MODE_SENSE:
 437         case MODE_SENSE_10:
 438                 errsts = resp_mode_sense(SCpnt, target, devip);
 439                 break;
 440         case SYNCHRONIZE_CACHE:
 441                 errsts = check_reset(SCpnt, devip);
 442                 break;
 443         default:
 444                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 445                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
 446                                "supported\n", *cmd);
 447                 if ((errsts = check_reset(SCpnt, devip)))
 448                         break;  /* Unit attention takes precedence */
 449                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
 450                 errsts = check_condition_result;
 451                 break;
 452         }
 453         return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
 454 }
 455
 456 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
 457 {
 458         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
 459                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
 460         }
 461         return -EINVAL;
 462         /* return -ENOTTY; // correct return but upsets fdisk */
 463 }
 464
 465 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip)
 466 {
 467         if (devip->reset) {
 468                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 469                         printk(KERN_INFO "scsi_debug: Reporting Unit "
 470                                "attention: power on reset\n");
 471                 devip->reset = 0;
 472                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
 473                 return check_condition_result;
 474         }
 475         return 0;
 476 }
 477
 478 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
 479 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 480                                 int arr_len)
 481 {
 482         int k, req_len, act_len, len, active;
 483         void * kaddr;
 484         void * kaddr_off;
 485         struct scatterlist * sgpnt;
 486
 487         if (0 == scp->request_bufflen)
 488                 return 0;
 489         if (NULL == scp->request_buffer)
 490                 return (DID_ERROR << 16);
 491         if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
 492               (scp->sc_data_direction == DMA_FROM_DEVICE)))
 493                 return (DID_ERROR << 16);
 494         if (0 == scp->use_sg) {
 495                 req_len = scp->request_bufflen;
 496                 act_len = (req_len < arr_len) ? req_len : arr_len;
 497                 memcpy(scp->request_buffer, arr, act_len);
 498                 scp->resid = req_len - act_len;
 499                 return 0;
 500         }
 501         sgpnt = (struct scatterlist *)scp->request_buffer;
 502         active = 1;
 503         for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
 504                 if (active) {
 505                         kaddr = (unsigned char *)
 506                                 kmap_atomic(sgpnt->page, KM_USER0);
 507                         if (NULL == kaddr)
 508                                 return (DID_ERROR << 16);
 509                         kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
 510                         len = sgpnt->length;
 511                         if ((req_len + len) > arr_len) {
 512                                 active = 0;
 513                                 len = arr_len - req_len;
 514                         }
 515                         memcpy(kaddr_off, arr + req_len, len);
 516                         kunmap_atomic(kaddr, KM_USER0);
 517                         act_len += len;
 518                 }
 519                 req_len += sgpnt->length;
 520         }
 521         scp->resid = req_len - act_len;
 522         return 0;
 523 }
 524
 525 /* Returns number of bytes fetched into 'arr' or -1 if error. */
 526 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 527                                int max_arr_len)
 528 {
 529         int k, req_len, len, fin;
 530         void * kaddr;
 531         void * kaddr_off;
 532         struct scatterlist * sgpnt;
 533
 534         if (0 == scp->request_bufflen)
 535                 return 0;
 536         if (NULL == scp->request_buffer)
 537                 return -1;
 538         if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
 539               (scp->sc_data_direction == DMA_TO_DEVICE)))
 540                 return -1;
 541         if (0 == scp->use_sg) {
 542                 req_len = scp->request_bufflen;
 543                 len = (req_len < max_arr_len) ? req_len : max_arr_len;
 544                 memcpy(arr, scp->request_buffer, len);
 545                 return len;
 546         }
 547         sgpnt = (struct scatterlist *)scp->request_buffer;
 548         for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
 549                 kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
 550                 if (NULL == kaddr)
 551                         return -1;
 552                 kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
 553                 len = sgpnt->length;
 554                 if ((req_len + len) > max_arr_len) {
 555                         len = max_arr_len - req_len;
 556                         fin = 1;
 557                 }
 558                 memcpy(arr + req_len, kaddr_off, len);
 559                 kunmap_atomic(kaddr, KM_USER0);
 560                 if (fin)
 561                         return req_len + len;
 562                 req_len += sgpnt->length;
 563         }
 564         return req_len;
 565 }
 566
 567
 568 static const char * inq_vendor_id = "Linux   ";
 569 static const char * inq_product_id = "scsi_debug      ";
 570 static const char * inq_product_rev = "0004";
 571
 572 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 573                            const char * dev_id_str, int dev_id_str_len)
 574 {
 575         int num;
 576
 577         /* Two identification descriptors: */
 578         /* T10 vendor identifier field format (faked) */
 579         arr[0] = 0x2;   /* ASCII */
 580         arr[1] = 0x1;
 581         arr[2] = 0x0;
 582         memcpy(&arr[4], inq_vendor_id, 8);
 583         memcpy(&arr[12], inq_product_id, 16);
 584         memcpy(&arr[28], dev_id_str, dev_id_str_len);
 585         num = 8 + 16 + dev_id_str_len;
 586         arr[3] = num;
 587         num += 4;
 588         /* NAA IEEE registered identifier (faked) */
 589         arr[num] = 0x1; /* binary */
 590         arr[num + 1] = 0x3;
 591         arr[num + 2] = 0x0;
 592         arr[num + 3] = 0x8;
 593         arr[num + 4] = 0x51;    /* ieee company id=0x123456 (faked) */
 594         arr[num + 5] = 0x23;
 595         arr[num + 6] = 0x45;
 596         arr[num + 7] = 0x60;
 597         arr[num + 8] = (dev_id_num >> 24);
 598         arr[num + 9] = (dev_id_num >> 16) & 0xff;
 599         arr[num + 10] = (dev_id_num >> 8) & 0xff;
 600         arr[num + 11] = dev_id_num & 0xff;
 601         return num + 12;
 602 }
 603
 604
 605 #define SDEBUG_LONG_INQ_SZ 96
 606 #define SDEBUG_MAX_INQ_ARR_SZ 128
 607
 608 static int resp_inquiry(struct scsi_cmnd * scp, int target,
 609                         struct sdebug_dev_info * devip)
 610 {
 611         unsigned char pq_pdt;
 612         unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
 613         unsigned char *cmd = (unsigned char *)scp->cmnd;
 614         int alloc_len;
 615
 616         alloc_len = (cmd[3] << 8) + cmd[4];
 617         memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
 618         pq_pdt = (scsi_debug_ptype & 0x1f);
 619         arr[0] = pq_pdt;
 620         if (0x2 & cmd[1]) {  /* CMDDT bit set */
 621                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 622                                 0);
 623                 return check_condition_result;
 624         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
 625                 int dev_id_num, len;
 626                 char dev_id_str[6];
 627
 628                 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
 629                              (devip->target * 1000) + devip->lun;
 630                 len = scnprintf(dev_id_str, 6, "%d", dev_id_num);
 631                 if (0 == cmd[2]) { /* supported vital product data pages */
 632                         arr[3] = 3;
 633                         arr[4] = 0x0; /* this page */
 634                         arr[5] = 0x80; /* unit serial number */
 635                         arr[6] = 0x83; /* device identification */
 636                 } else if (0x80 == cmd[2]) { /* unit serial number */
 637                         arr[1] = 0x80;
 638                         arr[3] = len;
 639                         memcpy(&arr[4], dev_id_str, len);
 640                 } else if (0x83 == cmd[2]) { /* device identification */
 641                         arr[1] = 0x83;
 642                         arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
 643                                                  dev_id_str, len);
 644                 } else {
 645                         /* Illegal request, invalid field in cdb */
 646                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
 647                                         INVALID_FIELD_IN_CDB, 0);
 648                         return check_condition_result;
 649                 }
 650                 return fill_from_dev_buffer(scp, arr,
 651                             min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ));
 652         }
 653         /* drops through here for a standard inquiry */
 654         arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;     /* Removable disk */
 655         arr[2] = scsi_debug_scsi_level;
 656         arr[3] = 2;    /* response_data_format==2 */
 657         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
 658         arr[6] = 0x1; /* claim: ADDR16 */
 659         /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
 660         arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
 661         memcpy(&arr[8], inq_vendor_id, 8);
 662         memcpy(&arr[16], inq_product_id, 16);
 663         memcpy(&arr[32], inq_product_rev, 4);
 664         /* version descriptors (2 bytes each) follow */
 665         arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */
 666         arr[60] = 0x3; arr[61] = 0x0;  /* SPC-3 */
 667         if (scsi_debug_ptype == 0) {
 668                 arr[62] = 0x1; arr[63] = 0x80; /* SBC */
 669         } else if (scsi_debug_ptype == 1) {
 670                 arr[62] = 0x2; arr[63] = 0x00; /* SSC */
 671         }
 672         return fill_from_dev_buffer(scp, arr,
 673                             min(alloc_len, SDEBUG_LONG_INQ_SZ));
 674 }
 675
 676 static int resp_requests(struct scsi_cmnd * scp,
 677                          struct sdebug_dev_info * devip)
 678 {
 679         unsigned char * sbuff;
 680         unsigned char *cmd = (unsigned char *)scp->cmnd;
 681         unsigned char arr[SDEBUG_SENSE_LEN];
 682         int len = 18;
 683
 684         memset(arr, 0, SDEBUG_SENSE_LEN);
 685         if (devip->reset == 1)
 686                 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
 687         sbuff = devip->sense_buff;
 688         if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
 689                 /* DESC bit set and sense_buff in fixed format */
 690                 arr[0] = 0x72;
 691                 arr[1] = sbuff[2];     /* sense key */
 692                 arr[2] = sbuff[12];    /* asc */
 693                 arr[3] = sbuff[13];    /* ascq */
 694                 len = 8;
 695         } else
 696                 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
 697         mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
 698         return fill_from_dev_buffer(scp, arr, len);
 699 }
 700
 701 #define SDEBUG_READCAP_ARR_SZ 8
 702 static int resp_readcap(struct scsi_cmnd * scp,
 703                         struct sdebug_dev_info * devip)
 704 {
 705         unsigned char arr[SDEBUG_READCAP_ARR_SZ];
 706         unsigned long capac;
 707         int errsts;
 708
 709         if ((errsts = check_reset(scp, devip)))
 710                 return errsts;
 711         memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
 712         capac = (unsigned long)sdebug_capacity - 1;
 713         arr[0] = (capac >> 24);
 714         arr[1] = (capac >> 16) & 0xff;
 715         arr[2] = (capac >> 8) & 0xff;
 716         arr[3] = capac & 0xff;
 717         arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
 718         arr[7] = SECT_SIZE_PER(target) & 0xff;
 719         return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
 720 }
 721
 722 /* <<Following mode page info copied from ST318451LW>> */
 723
 724 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
 725 {       /* Read-Write Error Recovery page for mode_sense */
 726         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
 727                                         5, 0, 0xff, 0xff};
 728
 729         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
 730         if (1 == pcontrol)
 731                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
 732         return sizeof(err_recov_pg);
 733 }
 734
 735 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
 736 {       /* Disconnect-Reconnect page for mode_sense */
 737         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
 738                                          0, 0, 0, 0, 0, 0, 0, 0};
 739
 740         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
 741         if (1 == pcontrol)
 742                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
 743         return sizeof(disconnect_pg);
 744 }
 745
 746 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
 747 {       /* Format device page for mode_sense */
 748         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
 749                                      0, 0, 0, 0, 0, 0, 0, 0,
 750                                      0, 0, 0, 0, 0x40, 0, 0, 0};
 751
 752         memcpy(p, format_pg, sizeof(format_pg));
 753         p[10] = (sdebug_sectors_per >> 8) & 0xff;
 754         p[11] = sdebug_sectors_per & 0xff;
 755         p[12] = (SECT_SIZE >> 8) & 0xff;
 756         p[13] = SECT_SIZE & 0xff;
 757         if (DEV_REMOVEABLE(target))
 758                 p[20] |= 0x20; /* should agree with INQUIRY */
 759         if (1 == pcontrol)
 760                 memset(p + 2, 0, sizeof(format_pg) - 2);
 761         return sizeof(format_pg);
 762 }
 763
 764 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
 765 {       /* Caching page for mode_sense */
 766         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
 767                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
 768
 769         memcpy(p, caching_pg, sizeof(caching_pg));
 770         if (1 == pcontrol)
 771                 memset(p + 2, 0, sizeof(caching_pg) - 2);
 772         return sizeof(caching_pg);
 773 }
 774
 775 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
 776 {       /* Control mode page for mode_sense */
 777         unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 778                                      0, 0, 0x2, 0x4b};
 779
 780         if (scsi_debug_dsense)
 781                 ctrl_m_pg[2] |= 0x4;
 782         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
 783         if (1 == pcontrol)
 784                 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
 785         return sizeof(ctrl_m_pg);
 786 }
 787
 788 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
 789 {       /* Informational Exceptions control mode page for mode_sense */
 790         unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 791                                     0, 0, 0x0, 0x0};
 792         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
 793         if (1 == pcontrol)
 794                 memset(p + 2, 0, sizeof(iec_m_pg) - 2);
 795         return sizeof(iec_m_pg);
 796 }
 797
 798 #define SDEBUG_MAX_MSENSE_SZ 256
 799
 800 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
 801                            struct sdebug_dev_info * devip)
 802 {
 803         unsigned char dbd;
 804         int pcontrol, pcode, subpcode;
 805         unsigned char dev_spec;
 806         int alloc_len, msense_6, offset, len, errsts;
 807         unsigned char * ap;
 808         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
 809         unsigned char *cmd = (unsigned char *)scp->cmnd;
 810
 811         if ((errsts = check_reset(scp, devip)))
 812                 return errsts;
 813         dbd = cmd[1] & 0x8;
 814         pcontrol = (cmd[2] & 0xc0) >> 6;
 815         pcode = cmd[2] & 0x3f;
 816         subpcode = cmd[3];
 817         msense_6 = (MODE_SENSE == cmd[0]);
 818         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
 819         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
 820         if (0x3 == pcontrol) {  /* Saving values not supported */
 821                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
 822                                 0);
 823                 return check_condition_result;
 824         }
 825         dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
 826         if (msense_6) {
 827                 arr[2] = dev_spec;
 828                 offset = 4;
 829         } else {
 830                 arr[3] = dev_spec;
 831                 offset = 8;
 832         }
 833         ap = arr + offset;
 834
 835         if (0 != subpcode) { /* TODO: Control Extension page */
 836                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 837                                 0);
 838                 return check_condition_result;
 839         }
 840         switch (pcode) {
 841         case 0x1:       /* Read-Write error recovery page, direct access */
 842                 len = resp_err_recov_pg(ap, pcontrol, target);
 843                 offset += len;
 844                 break;
 845         case 0x2:       /* Disconnect-Reconnect page, all devices */
 846                 len = resp_disconnect_pg(ap, pcontrol, target);
 847                 offset += len;
 848                 break;
 849         case 0x3:       /* Format device page, direct access */
 850                 len = resp_format_pg(ap, pcontrol, target);
 851                 offset += len;
 852                 break;
 853         case 0x8:       /* Caching page, direct access */
 854                 len = resp_caching_pg(ap, pcontrol, target);
 855                 offset += len;
 856                 break;
 857         case 0xa:       /* Control Mode page, all devices */
 858                 len = resp_ctrl_m_pg(ap, pcontrol, target);
 859                 offset += len;
 860                 break;
 861         case 0x1c:      /* Informational Exceptions Mode page, all devices */
 862                 len = resp_iec_m_pg(ap, pcontrol, target);
 863                 offset += len;
 864                 break;
 865         case 0x3f:      /* Read all Mode pages */
 866                 len = resp_err_recov_pg(ap, pcontrol, target);
 867                 len += resp_disconnect_pg(ap + len, pcontrol, target);
 868                 len += resp_format_pg(ap + len, pcontrol, target);
 869                 len += resp_caching_pg(ap + len, pcontrol, target);
 870                 len += resp_ctrl_m_pg(ap + len, pcontrol, target);
 871                 len += resp_iec_m_pg(ap + len, pcontrol, target);
 872                 offset += len;
 873                 break;
 874         default:
 875                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 876                                 0);
 877                 return check_condition_result;
 878         }
 879         if (msense_6)
 880                 arr[0] = offset - 1;
 881         else {
 882                 arr[0] = ((offset - 2) >> 8) & 0xff;
 883                 arr[1] = (offset - 2) & 0xff;
 884         }
 885         return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
 886 }
 887
 888 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 889                      int num, struct sdebug_dev_info * devip)
 890 {
 891         unsigned long iflags;
 892         int ret;
 893
 894         if (upper_blk || (block + num > sdebug_capacity)) {
 895                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 896                                 0);
 897                 return check_condition_result;
 898         }
 899         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
 900             (block <= OPT_MEDIUM_ERR_ADDR) &&
 901             ((block + num) > OPT_MEDIUM_ERR_ADDR)) {
 902                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
 903                                 0);
 904                 /* claim unrecoverable read error */
 905                 return check_condition_result;
 906         }
 907         read_lock_irqsave(&atomic_rw, iflags);
 908         ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
 909                                    num * SECT_SIZE);
 910         read_unlock_irqrestore(&atomic_rw, iflags);
 911         return ret;
 912 }
 913
 914 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 915                       int num, struct sdebug_dev_info * devip)
 916 {
 917         unsigned long iflags;
 918         int res;
 919
 920         if (upper_blk || (block + num > sdebug_capacity)) {
 921                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 922                                 0);
 923                 return check_condition_result;
 924         }
 925
 926         write_lock_irqsave(&atomic_rw, iflags);
 927         res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
 928                                   num * SECT_SIZE);
 929         write_unlock_irqrestore(&atomic_rw, iflags);
 930         if (-1 == res)
 931                 return (DID_ERROR << 16);
 932         else if ((res < (num * SECT_SIZE)) &&
 933                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
 934                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, "
 935                        " IO sent=%d bytes\n", num * SECT_SIZE, res);
 936         return 0;
 937 }
 938
 939 #define SDEBUG_RLUN_ARR_SZ 128
 940
 941 static int resp_report_luns(struct scsi_cmnd * scp,
 942                             struct sdebug_dev_info * devip)
 943 {
 944         unsigned int alloc_len;
 945         int lun_cnt, i, upper;
 946         unsigned char *cmd = (unsigned char *)scp->cmnd;
 947         int select_report = (int)cmd[2];
 948         struct scsi_lun *one_lun;
 949         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
 950
 951         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
 952         if ((alloc_len < 16) || (select_report > 2)) {
 953                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 954                                 0);
 955                 return check_condition_result;
 956         }
 957         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
 958         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
 959         lun_cnt = scsi_debug_max_luns;
 960         arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff;
 961         arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff;
 962         lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
 963                             sizeof(struct scsi_lun)), lun_cnt);
 964         one_lun = (struct scsi_lun *) &arr[8];
 965         for (i = 0; i < lun_cnt; i++) {
 966                 upper = (i >> 8) & 0x3f;
 967                 if (upper)
 968                         one_lun[i].scsi_lun[0] =
 969                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
 970                 one_lun[i].scsi_lun[1] = i & 0xff;
 971         }
 972         return fill_from_dev_buffer(scp, arr,
 973                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
 974 }
 975
 976 /* When timer goes off this function is called. */
 977 static void timer_intr_handler(unsigned long indx)
 978 {
 979         struct sdebug_queued_cmd * sqcp;
 980         unsigned long iflags;
 981
 982         if (indx >= SCSI_DEBUG_CANQUEUE) {
 983                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
 984                        "large\n");
 985                 return;
 986         }
 987         spin_lock_irqsave(&queued_arr_lock, iflags);
 988         sqcp = &queued_arr[(int)indx];
 989         if (! sqcp->in_use) {
 990                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
 991                        "interrupt\n");
 992                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
 993                 return;
 994         }
 995         sqcp->in_use = 0;
 996         if (sqcp->done_funct) {
 997                 sqcp->a_cmnd->result = sqcp->scsi_result;
 998                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
 999         }
1000         sqcp->done_funct = NULL;
1001         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1002 }
1003
1004 static int scsi_debug_slave_alloc(struct scsi_device * sdp)
1005 {
1006         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1007                 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_alloc\n");
1008         return 0;
1009 }
1010
1011 static int scsi_debug_slave_configure(struct scsi_device * sdp)
1012 {
1013         struct sdebug_dev_info * devip;
1014
1015         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1016                 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_configure\n");
1017         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
1018                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
1019         devip = devInfoReg(sdp);
1020         sdp->hostdata = devip;
1021         if (sdp->host->cmd_per_lun)
1022                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
1023                                         sdp->host->cmd_per_lun);
1024         return 0;
1025 }
1026
1027 static void scsi_debug_slave_destroy(struct scsi_device * sdp)
1028 {
1029         struct sdebug_dev_info * devip =
1030                                 (struct sdebug_dev_info *)sdp->hostdata;
1031
1032         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1033                 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_destroy\n");
1034         if (devip) {
1035                 /* make this slot avaliable for re-use */
1036                 devip->used = 0;
1037                 sdp->hostdata = NULL;
1038         }
1039 }
1040
1041 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
1042 {
1043         struct sdebug_host_info * sdbg_host;
1044         struct sdebug_dev_info * open_devip = NULL;
1045         struct sdebug_dev_info * devip =
1046                         (struct sdebug_dev_info *)sdev->hostdata;
1047
1048         if (devip)
1049                 return devip;
1050         sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
1051         if(! sdbg_host) {
1052                 printk(KERN_ERR "Host info NULL\n");
1053                 return NULL;
1054         }
1055         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
1056                 if ((devip->used) && (devip->channel == sdev->channel) &&
1057                     (devip->target == sdev->id) &&
1058                     (devip->lun == sdev->lun))
1059                         return devip;
1060                 else {
1061                         if ((!devip->used) && (!open_devip))
1062                                 open_devip = devip;
1063                 }
1064         }
1065         if (NULL == open_devip) { /* try and make a new one */
1066                 open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL);
1067                 if (NULL == open_devip) {
1068                         printk(KERN_ERR "%s: out of memory at line %d\n",
1069                                 __FUNCTION__, __LINE__);
1070                         return NULL;
1071                 }
1072                 memset(open_devip, 0, sizeof(*open_devip));
1073                 open_devip->sdbg_host = sdbg_host;
1074                 list_add_tail(&open_devip->dev_list,
1075                 &sdbg_host->dev_info_list);
1076         }
1077         if (open_devip) {
1078                 open_devip->channel = sdev->channel;
1079                 open_devip->target = sdev->id;
1080                 open_devip->lun = sdev->lun;
1081                 open_devip->sdbg_host = sdbg_host;
1082                 open_devip->reset = 1;
1083                 open_devip->used = 1;
1084                 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
1085                 if (scsi_debug_dsense)
1086                         open_devip->sense_buff[0] = 0x72;
1087                 else {
1088                         open_devip->sense_buff[0] = 0x70;
1089                         open_devip->sense_buff[7] = 0xa;
1090                 }
1091                 return open_devip;
1092         }
1093         return NULL;
1094 }
1095
1096 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
1097                             int asc, int asq)
1098 {
1099         unsigned char * sbuff;
1100
1101         sbuff = devip->sense_buff;
1102         memset(sbuff, 0, SDEBUG_SENSE_LEN);
1103         if (scsi_debug_dsense) {
1104                 sbuff[0] = 0x72;  /* descriptor, current */
1105                 sbuff[1] = key;
1106                 sbuff[2] = asc;
1107                 sbuff[3] = asq;
1108         } else {
1109                 sbuff[0] = 0x70;  /* fixed, current */
1110                 sbuff[2] = key;
1111                 sbuff[7] = 0xa;   /* implies 18 byte sense buffer */
1112                 sbuff[12] = asc;
1113                 sbuff[13] = asq;
1114         }
1115         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1116                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
1117                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
1118 }
1119
1120 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
1121 {
1122         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1123                 printk(KERN_INFO "scsi_debug: abort\n");
1124         ++num_aborts;
1125         stop_queued_cmnd(SCpnt);
1126         return SUCCESS;
1127 }
1128
1129 static int scsi_debug_biosparam(struct scsi_device *sdev,
1130                 struct block_device * bdev, sector_t capacity, int *info)
1131 {
1132         int res;
1133         unsigned char *buf;
1134
1135         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1136                 printk(KERN_INFO "scsi_debug: biosparam\n");
1137         buf = scsi_bios_ptable(bdev);
1138         if (buf) {
1139                 res = scsi_partsize(buf, capacity,
1140                                     &info[2], &info[0], &info[1]);
1141                 kfree(buf);
1142                 if (! res)
1143                         return res;
1144         }
1145         info[0] = sdebug_heads;
1146         info[1] = sdebug_sectors_per;
1147         info[2] = sdebug_cylinders_per;
1148         return 0;
1149 }
1150
1151 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
1152 {
1153         struct sdebug_dev_info * devip;
1154
1155         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1156                 printk(KERN_INFO "scsi_debug: device_reset\n");
1157         ++num_dev_resets;
1158         if (SCpnt) {
1159                 devip = devInfoReg(SCpnt->device);
1160                 if (devip)
1161                         devip->reset = 1;
1162         }
1163         return SUCCESS;
1164 }
1165
1166 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
1167 {
1168         struct sdebug_host_info *sdbg_host;
1169         struct sdebug_dev_info * dev_info;
1170         struct scsi_device * sdp;
1171         struct Scsi_Host * hp;
1172
1173         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1174                 printk(KERN_INFO "scsi_debug: bus_reset\n");
1175         ++num_bus_resets;
1176         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
1177                 sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
1178                 if (sdbg_host) {
1179                         list_for_each_entry(dev_info,
1180                                             &sdbg_host->dev_info_list,
1181                                             dev_list)
1182                                 dev_info->reset = 1;
1183                 }
1184         }
1185         return SUCCESS;
1186 }
1187
1188 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
1189 {
1190         struct sdebug_host_info * sdbg_host;
1191         struct sdebug_dev_info * dev_info;
1192
1193         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1194                 printk(KERN_INFO "scsi_debug: host_reset\n");
1195         ++num_host_resets;
1196         spin_lock(&sdebug_host_list_lock);
1197         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1198                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
1199                                     dev_list)
1200                         dev_info->reset = 1;
1201         }
1202         spin_unlock(&sdebug_host_list_lock);
1203         stop_all_queued();
1204         return SUCCESS;
1205 }
1206
1207 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
1208 static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
1209 {
1210         unsigned long iflags;
1211         int k;
1212         struct sdebug_queued_cmd * sqcp;
1213
1214         spin_lock_irqsave(&queued_arr_lock, iflags);
1215         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1216                 sqcp = &queued_arr[k];
1217                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
1218                         del_timer_sync(&sqcp->cmnd_timer);
1219                         sqcp->in_use = 0;
1220                         sqcp->a_cmnd = NULL;
1221                         break;
1222                 }
1223         }
1224         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1225         return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
1226 }
1227
1228 /* Deletes (stops) timers of all queued commands */
1229 static void stop_all_queued(void)
1230 {
1231         unsigned long iflags;
1232         int k;
1233         struct sdebug_queued_cmd * sqcp;
1234
1235         spin_lock_irqsave(&queued_arr_lock, iflags);
1236         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1237                 sqcp = &queued_arr[k];
1238                 if (sqcp->in_use && sqcp->a_cmnd) {
1239                         del_timer_sync(&sqcp->cmnd_timer);
1240                         sqcp->in_use = 0;
1241                         sqcp->a_cmnd = NULL;
1242                 }
1243         }
1244         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1245 }
1246
1247 /* Initializes timers in queued array */
1248 static void __init init_all_queued(void)
1249 {
1250         unsigned long iflags;
1251         int k;
1252         struct sdebug_queued_cmd * sqcp;
1253
1254         spin_lock_irqsave(&queued_arr_lock, iflags);
1255         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1256                 sqcp = &queued_arr[k];
1257                 init_timer(&sqcp->cmnd_timer);
1258                 sqcp->in_use = 0;
1259                 sqcp->a_cmnd = NULL;
1260         }
1261         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1262 }
1263
1264 static void __init sdebug_build_parts(unsigned char * ramp)
1265 {
1266         struct partition * pp;
1267         int starts[SDEBUG_MAX_PARTS + 2];
1268         int sectors_per_part, num_sectors, k;
1269         int heads_by_sects, start_sec, end_sec;
1270
1271         /* assume partition table already zeroed */
1272         if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
1273                 return;
1274         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
1275                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
1276                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
1277                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
1278         }
1279         num_sectors = (int)(sdebug_store_size / SECT_SIZE);
1280         sectors_per_part = (num_sectors - sdebug_sectors_per)
1281                            / scsi_debug_num_parts;
1282         heads_by_sects = sdebug_heads * sdebug_sectors_per;
1283         starts[0] = sdebug_sectors_per;
1284         for (k = 1; k < scsi_debug_num_parts; ++k)
1285                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
1286                             * heads_by_sects;
1287         starts[scsi_debug_num_parts] = num_sectors;
1288         starts[scsi_debug_num_parts + 1] = 0;
1289
1290         ramp[510] = 0x55;       /* magic partition markings */
1291         ramp[511] = 0xAA;
1292         pp = (struct partition *)(ramp + 0x1be);
1293         for (k = 0; starts[k + 1]; ++k, ++pp) {
1294                 start_sec = starts[k];
1295                 end_sec = starts[k + 1] - 1;
1296                 pp->boot_ind = 0;
1297
1298                 pp->cyl = start_sec / heads_by_sects;
1299                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
1300                            / sdebug_sectors_per;
1301                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
1302
1303                 pp->end_cyl = end_sec / heads_by_sects;
1304                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
1305                                / sdebug_sectors_per;
1306                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
1307
1308                 pp->start_sect = start_sec;
1309                 pp->nr_sects = end_sec - start_sec + 1;
1310                 pp->sys_ind = 0x83;     /* plain Linux partition */
1311         }
1312 }
1313
1314 static int schedule_resp(struct scsi_cmnd * cmnd,
1315                          struct sdebug_dev_info * devip,
1316                          done_funct_t done, int scsi_result, int delta_jiff)
1317 {
1318         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
1319                 if (scsi_result) {
1320                         struct scsi_device * sdp = cmnd->device;
1321
1322                         sdev_printk(KERN_INFO, sdp,
1323                                 "non-zero result=0x%x\n",
1324                                 scsi_result);
1325                 }
1326         }
1327         if (cmnd && devip) {
1328                 /* simulate autosense by this driver */
1329                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
1330                         memcpy(cmnd->sense_buffer, devip->sense_buff,
1331                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
1332                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
1333         }
1334         if (delta_jiff <= 0) {
1335                 if (cmnd)
1336                         cmnd->result = scsi_result;
1337                 if (done)
1338                         done(cmnd);
1339                 return 0;
1340         } else {
1341                 unsigned long iflags;
1342                 int k;
1343                 struct sdebug_queued_cmd * sqcp = NULL;
1344
1345                 spin_lock_irqsave(&queued_arr_lock, iflags);
1346                 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1347                         sqcp = &queued_arr[k];
1348                         if (! sqcp->in_use)
1349                                 break;
1350                 }
1351                 if (k >= SCSI_DEBUG_CANQUEUE) {
1352                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1353                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
1354                         return 1;       /* report busy to mid level */
1355                 }
1356                 sqcp->in_use = 1;
1357                 sqcp->a_cmnd = cmnd;
1358                 sqcp->scsi_result = scsi_result;
1359                 sqcp->done_funct = done;
1360                 sqcp->cmnd_timer.function = timer_intr_handler;
1361                 sqcp->cmnd_timer.data = k;
1362                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
1363                 add_timer(&sqcp->cmnd_timer);
1364                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1365                 if (cmnd)
1366                         cmnd->result = 0;
1367                 return 0;
1368         }
1369 }
1370
1371 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1372  * of sysfs parameters (which module_param doesn't yet support).
1373  * Sysfs parameters defined explicitly below.
1374  */
1375 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
1376 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
1377 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
1378 module_param_named(dsense, scsi_debug_dsense, int, 0);
1379 module_param_named(every_nth, scsi_debug_every_nth, int, 0);
1380 module_param_named(max_luns, scsi_debug_max_luns, int, 0);
1381 module_param_named(num_parts, scsi_debug_num_parts, int, 0);
1382 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
1383 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
1384 module_param_named(ptype, scsi_debug_ptype, int, 0);
1385 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);
1386
1387 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
1388 MODULE_DESCRIPTION("SCSI debug adapter driver");
1389 MODULE_LICENSE("GPL");
1390 MODULE_VERSION(SCSI_DEBUG_VERSION);
1391
1392 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
1393 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
1394 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
1395 MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)");
1396 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
1397 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
1398 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
1399 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
1400 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
1401 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
1402 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
1403
1404
1405 static char sdebug_info[256];
1406
1407 static const char * scsi_debug_info(struct Scsi_Host * shp)
1408 {
1409         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
1410                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
1411                 scsi_debug_version_date, scsi_debug_dev_size_mb,
1412                 scsi_debug_opts);
1413         return sdebug_info;
1414 }
1415
1416 /* scsi_debug_proc_info
1417  * Used if the driver currently has no own support for /proc/scsi
1418  */
1419 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
1420                                 int length, int inout)
1421 {
1422         int len, pos, begin;
1423         int orig_length;
1424
1425         orig_length = length;
1426
1427         if (inout == 1) {
1428                 char arr[16];
1429                 int minLen = length > 15 ? 15 : length;
1430
1431                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1432                         return -EACCES;
1433                 memcpy(arr, buffer, minLen);
1434                 arr[minLen] = '\0';
1435                 if (1 != sscanf(arr, "%d", &pos))
1436                         return -EINVAL;
1437                 scsi_debug_opts = pos;
1438                 if (scsi_debug_every_nth != 0)
1439                         scsi_debug_cmnd_count = 0;
1440                 return length;
1441         }
1442         begin = 0;
1443         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
1444             "%s [%s]\n"
1445             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
1446             "every_nth=%d(curr:%d)\n"
1447             "delay=%d, max_luns=%d, scsi_level=%d\n"
1448             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
1449             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
1450             "host_resets=%d\n",
1451             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
1452             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
1453             scsi_debug_cmnd_count, scsi_debug_delay,
1454             scsi_debug_max_luns, scsi_debug_scsi_level,
1455             SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
1456             num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
1457         if (pos < offset) {
1458                 len = 0;
1459                 begin = pos;
1460         }
1461         *start = buffer + (offset - begin);     /* Start of wanted data */
1462         len -= (offset - begin);
1463         if (len > length)
1464                 len = length;
1465         return len;
1466 }
1467
1468 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
1469 {
1470         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
1471 }
1472
1473 static ssize_t sdebug_delay_store(struct device_driver * ddp,
1474                                   const char * buf, size_t count)
1475 {
1476         int delay;
1477         char work[20];
1478
1479         if (1 == sscanf(buf, "%10s", work)) {
1480                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
1481                         scsi_debug_delay = delay;
1482                         return count;
1483                 }
1484         }
1485         return -EINVAL;
1486 }
1487 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
1488             sdebug_delay_store);
1489
1490 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
1491 {
1492         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
1493 }
1494
1495 static ssize_t sdebug_opts_store(struct device_driver * ddp,
1496                                  const char * buf, size_t count)
1497 {
1498         int opts;
1499         char work[20];
1500
1501         if (1 == sscanf(buf, "%10s", work)) {
1502                 if (0 == strnicmp(work,"0x", 2)) {
1503                         if (1 == sscanf(&work[2], "%x", &opts))
1504                                 goto opts_done;
1505                 } else {
1506                         if (1 == sscanf(work, "%d", &opts))
1507                                 goto opts_done;
1508                 }
1509         }
1510         return -EINVAL;
1511 opts_done:
1512         scsi_debug_opts = opts;
1513         scsi_debug_cmnd_count = 0;
1514         return count;
1515 }
1516 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
1517             sdebug_opts_store);
1518
1519 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
1520 {
1521         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
1522 }
1523 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
1524                                   const char * buf, size_t count)
1525 {
1526         int n;
1527
1528         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1529                 scsi_debug_ptype = n;
1530                 return count;
1531         }
1532         return -EINVAL;
1533 }
1534 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
1535
1536 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
1537 {
1538         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
1539 }
1540 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
1541                                   const char * buf, size_t count)
1542 {
1543         int n;
1544
1545         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1546                 scsi_debug_dsense = n;
1547                 return count;
1548         }
1549         return -EINVAL;
1550 }
1551 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
1552             sdebug_dsense_store);
1553
1554 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
1555 {
1556         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
1557 }
1558 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
1559                                      const char * buf, size_t count)
1560 {
1561         int n;
1562
1563         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1564                 scsi_debug_num_tgts = n;
1565                 sdebug_max_tgts_luns();
1566                 return count;
1567         }
1568         return -EINVAL;
1569 }
1570 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
1571             sdebug_num_tgts_store);
1572
1573 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
1574 {
1575         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
1576 }
1577 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
1578
1579 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
1580 {
1581         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
1582 }
1583 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
1584
1585 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
1586 {
1587         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
1588 }
1589 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
1590                                       const char * buf, size_t count)
1591 {
1592         int nth;
1593
1594         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
1595                 scsi_debug_every_nth = nth;
1596                 scsi_debug_cmnd_count = 0;
1597                 return count;
1598         }
1599         return -EINVAL;
1600 }
1601 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
1602             sdebug_every_nth_store);
1603
1604 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
1605 {
1606         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
1607 }
1608 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
1609                                      const char * buf, size_t count)
1610 {
1611         int n;
1612
1613         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1614                 scsi_debug_max_luns = n;
1615                 sdebug_max_tgts_luns();
1616                 return count;
1617         }
1618         return -EINVAL;
1619 }
1620 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
1621             sdebug_max_luns_store);
1622
1623 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
1624 {
1625         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
1626 }
1627 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
1628
1629 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
1630 {
1631         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
1632 }
1633
1634 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
1635                                      const char * buf, size_t count)
1636 {
1637         int delta_hosts;
1638         char work[20];
1639
1640         if (1 != sscanf(buf, "%10s", work))
1641                 return -EINVAL;
1642         {       /* temporary hack around sscanf() problem with -ve nums */
1643                 int neg = 0;
1644
1645                 if ('-' == *work)
1646                         neg = 1;
1647                 if (1 != sscanf(work + neg, "%d", &delta_hosts))
1648                         return -EINVAL;
1649                 if (neg)
1650                         delta_hosts = -delta_hosts;
1651         }
1652         if (delta_hosts > 0) {
1653                 do {
1654                         sdebug_add_adapter();
1655                 } while (--delta_hosts);
1656         } else if (delta_hosts < 0) {
1657                 do {
1658                         sdebug_remove_adapter();
1659                 } while (++delta_hosts);
1660         }
1661         return count;
1662 }
1663 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
1664             sdebug_add_host_store);
1665
1666 static void do_create_driverfs_files(void)
1667 {
1668         driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1669         driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
1670         driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1671         driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
1672         driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1673         driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1674         driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1675         driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1676         driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1677         driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
1678         driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1679 }
1680
1681 static void do_remove_driverfs_files(void)
1682 {
1683         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1684         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
1685         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1686         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1687         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1688         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1689         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1690         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
1691         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1692         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
1693         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1694 }
1695
1696 static int __init scsi_debug_init(void)
1697 {
1698         unsigned long sz;
1699         int host_to_add;
1700         int k;
1701
1702         if (scsi_debug_dev_size_mb < 1)
1703                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
1704         sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576;
1705         sdebug_capacity = sdebug_store_size / SECT_SIZE;
1706
1707         /* play around with geometry, don't waste too much on track 0 */
1708         sdebug_heads = 8;
1709         sdebug_sectors_per = 32;
1710         if (scsi_debug_dev_size_mb >= 16)
1711                 sdebug_heads = 32;
1712         else if (scsi_debug_dev_size_mb >= 256)
1713                 sdebug_heads = 64;
1714         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1715                                (sdebug_sectors_per * sdebug_heads);
1716         if (sdebug_cylinders_per >= 1024) {
1717                 /* other LLDs do this; implies >= 1GB ram disk ... */
1718                 sdebug_heads = 255;
1719                 sdebug_sectors_per = 63;
1720                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1721                                (sdebug_sectors_per * sdebug_heads);
1722         }
1723
1724         sz = sdebug_store_size;
1725         fake_storep = vmalloc(sz);
1726         if (NULL == fake_storep) {
1727                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
1728                 return -ENOMEM;
1729         }
1730         memset(fake_storep, 0, sz);
1731         if (scsi_debug_num_parts > 0)
1732                 sdebug_build_parts(fake_storep);
1733
1734         init_all_queued();
1735
1736         device_register(&pseudo_primary);
1737         bus_register(&pseudo_lld_bus);
1738         driver_register(&sdebug_driverfs_driver);
1739         do_create_driverfs_files();
1740
1741         sdebug_driver_template.proc_name = (char *)sdebug_proc_name;
1742
1743         host_to_add = scsi_debug_add_host;
1744         scsi_debug_add_host = 0;
1745
1746         for (k = 0; k < host_to_add; k++) {
1747                 if (sdebug_add_adapter()) {
1748                         printk(KERN_ERR "scsi_debug_init: "
1749                                "sdebug_add_adapter failed k=%d\n", k);
1750                         break;
1751                 }
1752         }
1753
1754         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
1755                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
1756                        scsi_debug_add_host);
1757         }
1758         return 0;
1759 }
1760
1761 static void __exit scsi_debug_exit(void)
1762 {
1763         int k = scsi_debug_add_host;
1764
1765         stop_all_queued();
1766         for (; k; k--)
1767                 sdebug_remove_adapter();
1768         do_remove_driverfs_files();
1769         driver_unregister(&sdebug_driverfs_driver);
1770         bus_unregister(&pseudo_lld_bus);
1771         device_unregister(&pseudo_primary);
1772
1773         vfree(fake_storep);
1774 }
1775
1776 device_initcall(scsi_debug_init);
1777 module_exit(scsi_debug_exit);
1778
1779 static void pseudo_0_release(struct device * dev)
1780 {
1781         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1782                 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
1783 }
1784
1785 static struct device pseudo_primary = {
1786         .bus_id         = "pseudo_0",
1787         .release        = pseudo_0_release,
1788 };
1789
1790 static int pseudo_lld_bus_match(struct device *dev,
1791                           struct device_driver *dev_driver)
1792 {
1793         return 1;
1794 }
1795
1796 static struct bus_type pseudo_lld_bus = {
1797         .name = "pseudo",
1798         .match = pseudo_lld_bus_match,
1799 };
1800
1801 static void sdebug_release_adapter(struct device * dev)
1802 {
1803         struct sdebug_host_info *sdbg_host;
1804
1805         sdbg_host = to_sdebug_host(dev);
1806         kfree(sdbg_host);
1807 }
1808
1809 static int sdebug_add_adapter(void)
1810 {
1811         int k, devs_per_host;
1812         int error = 0;
1813         struct sdebug_host_info *sdbg_host;
1814         struct sdebug_dev_info *sdbg_devinfo;
1815         struct list_head *lh, *lh_sf;
1816
1817         sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
1818
1819         if (NULL == sdbg_host) {
1820                 printk(KERN_ERR "%s: out of memory at line %d\n",
1821                        __FUNCTION__, __LINE__);
1822                 return -ENOMEM;
1823         }
1824
1825         memset(sdbg_host, 0, sizeof(*sdbg_host));
1826         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
1827
1828         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
1829         for (k = 0; k < devs_per_host; k++) {
1830                 sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
1831                 if (NULL == sdbg_devinfo) {
1832                         printk(KERN_ERR "%s: out of memory at line %d\n",
1833                                __FUNCTION__, __LINE__);
1834                         error = -ENOMEM;
1835                         goto clean;
1836                 }
1837                 memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
1838                 sdbg_devinfo->sdbg_host = sdbg_host;
1839                 list_add_tail(&sdbg_devinfo->dev_list,
1840                               &sdbg_host->dev_info_list);
1841         }
1842
1843         spin_lock(&sdebug_host_list_lock);
1844         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
1845         spin_unlock(&sdebug_host_list_lock);
1846
1847         sdbg_host->dev.bus = &pseudo_lld_bus;
1848         sdbg_host->dev.parent = &pseudo_primary;
1849         sdbg_host->dev.release = &sdebug_release_adapter;
1850         sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
1851
1852         error = device_register(&sdbg_host->dev);
1853
1854         if (error)
1855                 goto clean;
1856
1857         ++scsi_debug_add_host;
1858         return error;
1859
1860 clean:
1861         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1862                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1863                                           dev_list);
1864                 list_del(&sdbg_devinfo->dev_list);
1865                 kfree(sdbg_devinfo);
1866         }
1867
1868         kfree(sdbg_host);
1869         return error;
1870 }
1871
1872 static void sdebug_remove_adapter(void)
1873 {
1874         struct sdebug_host_info * sdbg_host = NULL;
1875
1876         spin_lock(&sdebug_host_list_lock);
1877         if (!list_empty(&sdebug_host_list)) {
1878                 sdbg_host = list_entry(sdebug_host_list.prev,
1879                                        struct sdebug_host_info, host_list);
1880                 list_del(&sdbg_host->host_list);
1881         }
1882         spin_unlock(&sdebug_host_list_lock);
1883
1884         if (!sdbg_host)
1885                 return;
1886
1887         device_unregister(&sdbg_host->dev);
1888         --scsi_debug_add_host;
1889 }
1890
1891 static int sdebug_driver_probe(struct device * dev)
1892 {
1893         int error = 0;
1894         struct sdebug_host_info *sdbg_host;
1895         struct Scsi_Host *hpnt;
1896
1897         sdbg_host = to_sdebug_host(dev);
1898
1899         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
1900         if (NULL == hpnt) {
1901                 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
1902                 error = -ENODEV;
1903                 return error;
1904         }
1905
1906         sdbg_host->shost = hpnt;
1907         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
1908         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
1909                 hpnt->max_id = scsi_debug_num_tgts + 1;
1910         else
1911                 hpnt->max_id = scsi_debug_num_tgts;
1912         hpnt->max_lun = scsi_debug_max_luns;
1913
1914         error = scsi_add_host(hpnt, &sdbg_host->dev);
1915         if (error) {
1916                 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
1917                 error = -ENODEV;
1918                 scsi_host_put(hpnt);
1919         } else
1920                 scsi_scan_host(hpnt);
1921
1922
1923         return error;
1924 }
1925
1926 static int sdebug_driver_remove(struct device * dev)
1927 {
1928         struct list_head *lh, *lh_sf;
1929         struct sdebug_host_info *sdbg_host;
1930         struct sdebug_dev_info *sdbg_devinfo;
1931
1932         sdbg_host = to_sdebug_host(dev);
1933
1934         if (!sdbg_host) {
1935                 printk(KERN_ERR "%s: Unable to locate host info\n",
1936                        __FUNCTION__);
1937                 return -ENODEV;
1938         }
1939
1940         scsi_remove_host(sdbg_host->shost);
1941
1942         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1943                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1944                                           dev_list);
1945                 list_del(&sdbg_devinfo->dev_list);
1946                 kfree(sdbg_devinfo);
1947         }
1948
1949         scsi_host_put(sdbg_host->shost);
1950         return 0;
1951 }
1952
1953 static void sdebug_max_tgts_luns(void)
1954 {
1955         struct sdebug_host_info * sdbg_host;
1956         struct Scsi_Host *hpnt;
1957
1958         spin_lock(&sdebug_host_list_lock);
1959         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1960                 hpnt = sdbg_host->shost;
1961                 if ((hpnt->this_id >= 0) &&
1962                     (scsi_debug_num_tgts > hpnt->this_id))
1963                         hpnt->max_id = scsi_debug_num_tgts + 1;
1964                 else
1965                         hpnt->max_id = scsi_debug_num_tgts;
1966                 hpnt->max_lun = scsi_debug_max_luns;
1967         }
1968         spin_unlock(&sdebug_host_list_lock);
1969 }