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/sdebug25.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 #ifndef LINUX_VERSION_CODE
  52 #include <linux/version.h>
  53 #endif
  54
  55 #include "scsi_logging.h"
  56 #include "scsi_debug.h"
  57
  58 #define SCSI_DEBUG_VERSION "1.74"
  59 static const char * scsi_debug_version_date = "20040829";
  60
  61 /* Additional Sense Code (ASC) used */
  62 #define NO_ADDED_SENSE 0x0
  63 #define UNRECOVERED_READ_ERR 0x11
  64 #define INVALID_OPCODE 0x20
  65 #define ADDR_OUT_OF_RANGE 0x21
  66 #define INVALID_FIELD_IN_CDB 0x24
  67 #define POWERON_RESET 0x29
  68 #define SAVING_PARAMS_UNSUP 0x39
  69 #define THRESHHOLD_EXCEEDED 0x5d
  70
  71 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
  72
  73 /* Default values for driver parameters */
  74 #define DEF_NUM_HOST   1
  75 #define DEF_NUM_TGTS   1
  76 #define DEF_MAX_LUNS   1
  77 /* With these defaults, this driver will make 1 host with 1 target
  78  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  79  */
  80 #define DEF_DELAY   1
  81 #define DEF_DEV_SIZE_MB   8
  82 #define DEF_EVERY_NTH   0
  83 #define DEF_NUM_PARTS   0
  84 #define DEF_OPTS   0
  85 #define DEF_SCSI_LEVEL   4    /* SPC-2 */
  86 #define DEF_PTYPE   0
  87 #define DEF_D_SENSE   0
  88
  89 /* bit mask values for scsi_debug_opts */
  90 #define SCSI_DEBUG_OPT_NOISE   1
  91 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
  92 #define SCSI_DEBUG_OPT_TIMEOUT   4
  93 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
  94 /* When "every_nth" > 0 then modulo "every_nth" commands:
  95  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
  96  *   - a RECOVERED_ERROR is simulated on successful read and write
  97  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
  98  */
  99
 100 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
 101  * sector on read commands: */
 102 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
 103
 104 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
 105  * or "peripheral device" addressing (value 0) */
 106 #define SAM2_LUN_ADDRESS_METHOD 0
 107
 108 static int scsi_debug_add_host = DEF_NUM_HOST;
 109 static int scsi_debug_delay = DEF_DELAY;
 110 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
 111 static int scsi_debug_every_nth = DEF_EVERY_NTH;
 112 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 113 static int scsi_debug_num_parts = DEF_NUM_PARTS;
 114 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
 115 static int scsi_debug_opts = DEF_OPTS;
 116 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
 117 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
 118 static int scsi_debug_dsense = DEF_D_SENSE;
 119
 120 static int scsi_debug_cmnd_count = 0;
 121
 122 #define DEV_READONLY(TGT)      (0)
 123 #define DEV_REMOVEABLE(TGT)    (0)
 124
 125 static unsigned long sdebug_store_size; /* in bytes */
 126 static sector_t sdebug_capacity;        /* in sectors */
 127
 128 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
 129    may still need them */
 130 static int sdebug_heads;                /* heads per disk */
 131 static int sdebug_cylinders_per;        /* cylinders per surface */
 132 static int sdebug_sectors_per;          /* sectors per cylinder */
 133
 134 /* default sector size is 512 bytes, 2**9 bytes */
 135 #define POW2_SECT_SIZE 9
 136 #define SECT_SIZE (1 << POW2_SECT_SIZE)
 137 #define SECT_SIZE_PER(TGT) SECT_SIZE
 138
 139 #define SDEBUG_MAX_PARTS 4
 140
 141 #define SDEBUG_SENSE_LEN 32
 142
 143 struct sdebug_dev_info {
 144         struct list_head dev_list;
 145         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
 146         unsigned int channel;
 147         unsigned int target;
 148         unsigned int lun;
 149         struct sdebug_host_info *sdbg_host;
 150         char reset;
 151         char used;
 152 };
 153
 154 struct sdebug_host_info {
 155         struct list_head host_list;
 156         struct Scsi_Host *shost;
 157         struct device dev;
 158         struct list_head dev_info_list;
 159 };
 160
 161 #define to_sdebug_host(d)       \
 162         container_of(d, struct sdebug_host_info, dev)
 163
 164 static LIST_HEAD(sdebug_host_list);
 165 static spinlock_t sdebug_host_list_lock = SPIN_LOCK_UNLOCKED;
 166
 167 typedef void (* done_funct_t) (struct scsi_cmnd *);
 168
 169 struct sdebug_queued_cmd {
 170         int in_use;
 171         struct timer_list cmnd_timer;
 172         done_funct_t done_funct;
 173         struct scsi_cmnd * a_cmnd;
 174         int scsi_result;
 175 };
 176 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 177
 178 static Scsi_Host_Template sdebug_driver_template = {
 179         .proc_info =            scsi_debug_proc_info,
 180         .name =                 "SCSI DEBUG",
 181         .info =                 scsi_debug_info,
 182         .slave_alloc =          scsi_debug_slave_alloc,
 183         .slave_configure =      scsi_debug_slave_configure,
 184         .slave_destroy =        scsi_debug_slave_destroy,
 185         .ioctl =                scsi_debug_ioctl,
 186         .queuecommand =         scsi_debug_queuecommand,
 187         .eh_abort_handler =     scsi_debug_abort,
 188         .eh_bus_reset_handler = scsi_debug_bus_reset,
 189         .eh_device_reset_handler = scsi_debug_device_reset,
 190         .eh_host_reset_handler = scsi_debug_host_reset,
 191         .bios_param =           scsi_debug_biosparam,
 192         .can_queue =            SCSI_DEBUG_CANQUEUE,
 193         .this_id =              7,
 194         .sg_tablesize =         64,
 195         .cmd_per_lun =          3,
 196         .max_sectors =          4096,
 197         .unchecked_isa_dma =    0,
 198         .use_clustering =       ENABLE_CLUSTERING,
 199         .module =               THIS_MODULE,
 200 };
 201
 202 static unsigned char * fake_storep;     /* ramdisk storage */
 203
 204 static unsigned char spare_buff[SDEBUG_SENSE_LEN];
 205
 206 static int num_aborts = 0;
 207 static int num_dev_resets = 0;
 208 static int num_bus_resets = 0;
 209 static int num_host_resets = 0;
 210
 211 static spinlock_t queued_arr_lock = SPIN_LOCK_UNLOCKED;
 212 static rwlock_t atomic_rw = RW_LOCK_UNLOCKED;
 213
 214 static char sdebug_proc_name[] = "scsi_debug";
 215
 216 static int sdebug_driver_probe(struct device *);
 217 static int sdebug_driver_remove(struct device *);
 218 static struct bus_type pseudo_lld_bus;
 219
 220 static struct device_driver sdebug_driverfs_driver = {
 221         .name           = sdebug_proc_name,
 222         .bus            = &pseudo_lld_bus,
 223         .probe          = sdebug_driver_probe,
 224         .remove         = sdebug_driver_remove,
 225 };
 226
 227 static const int check_condition_result =
 228                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 229
 230 /* function declarations */
 231 static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
 232                         int bufflen, struct sdebug_dev_info * devip);
 233 static int resp_mode_sense(unsigned char * cmd, int target,
 234                            unsigned char * buff, int bufflen,
 235                            struct sdebug_dev_info * devip);
 236 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 237                      int num, struct sdebug_dev_info * devip);
 238 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 239                       int num, struct sdebug_dev_info * devip);
 240 static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
 241                             int bufflen, struct sdebug_dev_info * devip);
 242 static void timer_intr_handler(unsigned long);
 243 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
 244 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
 245                             int asc, int asq, int inbandLen);
 246 static int check_reset(struct scsi_cmnd * SCpnt,
 247                        struct sdebug_dev_info * devip);
 248 static int schedule_resp(struct scsi_cmnd * cmnd,
 249                          struct sdebug_dev_info * devip,
 250                          done_funct_t done, int scsi_result, int delta_jiff);
 251 static void __init sdebug_build_parts(unsigned char * ramp);
 252 static void __init init_all_queued(void);
 253 static void stop_all_queued(void);
 254 static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
 255 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 256                            const char * dev_id_str, int dev_id_str_len);
 257 static void do_create_driverfs_files(void);
 258 static void do_remove_driverfs_files(void);
 259
 260 static int sdebug_add_adapter(void);
 261 static void sdebug_remove_adapter(void);
 262 static void sdebug_max_tgts_luns(void);
 263
 264 static struct device pseudo_primary;
 265 static struct bus_type pseudo_lld_bus;
 266
 267 static unsigned char * scatg2virt(const struct scatterlist * sclp)
 268 {
 269         if (NULL == sclp)
 270                 return NULL;
 271         else if (sclp->page)
 272                 return (unsigned char *)page_address(sclp->page) +
 273                        sclp->offset;
 274         else
 275                 return NULL;
 276 }
 277
 278 static
 279 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
 280 {
 281         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
 282         int block, upper_blk, num, k;
 283         unsigned char *buff;
 284         int errsts = 0;
 285         int target = SCpnt->device->id;
 286         int bufflen = SCpnt->request_bufflen;
 287         unsigned long capac;
 288         struct sdebug_dev_info * devip = NULL;
 289         unsigned char * sbuff;
 290         int inj_recovered = 0;
 291
 292         if (done == NULL)
 293                 return 0;       /* assume mid level reprocessing command */
 294
 295         if (SCpnt->use_sg) { /* just use first element */
 296                 struct scatterlist *sgpnt = (struct scatterlist *)
 297                                                 SCpnt->request_buffer;
 298
 299                 buff = scatg2virt(&sgpnt[0]);
 300                 bufflen = sgpnt[0].length;
 301                 /* READ and WRITE process scatterlist themselves */
 302         }
 303         else
 304                 buff = (unsigned char *) SCpnt->request_buffer;
 305         if (NULL == buff) {
 306                 buff = spare_buff;      /* assume cmd moves no data */
 307                 bufflen = SDEBUG_SENSE_LEN;
 308         }
 309
 310         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
 311                 printk(KERN_INFO "scsi_debug: cmd ");
 312                 for (k = 0, num = SCpnt->cmd_len; k < num; ++k)
 313                         printk("%02x ", (int)cmd[k]);
 314                 printk("\n");
 315         }
 316         if(target == sdebug_driver_template.this_id) {
 317                 printk(KERN_INFO "scsi_debug: initiator's id used as "
 318                        "target!\n");
 319                 return schedule_resp(SCpnt, NULL, done,
 320                                      DID_NO_CONNECT << 16, 0);
 321         }
 322
 323         if (SCpnt->device->lun >= scsi_debug_max_luns)
 324                 return schedule_resp(SCpnt, NULL, done,
 325                                      DID_NO_CONNECT << 16, 0);
 326         devip = devInfoReg(SCpnt->device);
 327         if (NULL == devip)
 328                 return schedule_resp(SCpnt, NULL, done,
 329                                      DID_NO_CONNECT << 16, 0);
 330
 331         if ((scsi_debug_every_nth > 0) &&
 332             (++scsi_debug_cmnd_count >= scsi_debug_every_nth)) {
 333                 scsi_debug_cmnd_count =0;
 334                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
 335                         return 0; /* ignore command causing timeout */
 336                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
 337                         inj_recovered = 1; /* to reads and writes below */
 338         }
 339
 340         switch (*cmd) {
 341         case INQUIRY:     /* mandatory, ignore unit attention */
 342                 errsts = resp_inquiry(cmd, target, buff, bufflen, devip);
 343                 break;
 344         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
 345                 if (devip) {
 346                         sbuff = devip->sense_buff;
 347                         memcpy(buff, sbuff, (bufflen < SDEBUG_SENSE_LEN) ?
 348                                              bufflen : SDEBUG_SENSE_LEN);
 349                         mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0, 7);
 350                 } else {
 351                         memset(buff, 0, bufflen);
 352                         buff[0] = 0x70;
 353                 }
 354                 break;
 355         case REZERO_UNIT:       /* actually this is REWIND for SSC */
 356         case START_STOP:
 357                 errsts = check_reset(SCpnt, devip);
 358                 memset(buff, 0, bufflen);
 359                 break;
 360         case ALLOW_MEDIUM_REMOVAL:
 361                 if ((errsts = check_reset(SCpnt, devip)))
 362                         break;
 363                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 364                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
 365                                 cmd[4] ? "inhibited" : "enabled");
 366                 break;
 367         case SEND_DIAGNOSTIC:     /* mandatory */
 368                 errsts = check_reset(SCpnt, devip);
 369                 memset(buff, 0, bufflen);
 370                 break;
 371         case TEST_UNIT_READY:     /* mandatory */
 372                 errsts = check_reset(SCpnt, devip);
 373                 memset(buff, 0, bufflen);
 374                 break;
 375         case RESERVE:
 376                 errsts = check_reset(SCpnt, devip);
 377                 memset(buff, 0, bufflen);
 378                 break;
 379         case RESERVE_10:
 380                 errsts = check_reset(SCpnt, devip);
 381                 memset(buff, 0, bufflen);
 382                 break;
 383         case RELEASE:
 384                 errsts = check_reset(SCpnt, devip);
 385                 memset(buff, 0, bufflen);
 386                 break;
 387         case RELEASE_10:
 388                 errsts = check_reset(SCpnt, devip);
 389                 memset(buff, 0, bufflen);
 390                 break;
 391         case READ_CAPACITY:
 392                 errsts = check_reset(SCpnt, devip);
 393                 memset(buff, 0, bufflen);
 394                 if (bufflen > 7) {
 395                         capac = (unsigned long)sdebug_capacity - 1;
 396                         buff[0] = (capac >> 24);
 397                         buff[1] = (capac >> 16) & 0xff;
 398                         buff[2] = (capac >> 8) & 0xff;
 399                         buff[3] = capac & 0xff;
 400                         buff[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
 401                         buff[7] = SECT_SIZE_PER(target) & 0xff;
 402                 }
 403                 break;
 404         case READ_16:
 405         case READ_12:
 406         case READ_10:
 407         case READ_6:
 408                 if ((errsts = check_reset(SCpnt, devip)))
 409                         break;
 410                 upper_blk = 0;
 411                 if ((*cmd) == READ_16) {
 412                         upper_blk = cmd[5] + (cmd[4] << 8) +
 413                                     (cmd[3] << 16) + (cmd[2] << 24);
 414                         block = cmd[9] + (cmd[8] << 8) +
 415                                 (cmd[7] << 16) + (cmd[6] << 24);
 416                         num = cmd[13] + (cmd[12] << 8) +
 417                                 (cmd[11] << 16) + (cmd[10] << 24);
 418                 } else if ((*cmd) == READ_12) {
 419                         block = cmd[5] + (cmd[4] << 8) +
 420                                 (cmd[3] << 16) + (cmd[2] << 24);
 421                         num = cmd[9] + (cmd[8] << 8) +
 422                                 (cmd[7] << 16) + (cmd[6] << 24);
 423                 } else if ((*cmd) == READ_10) {
 424                         block = cmd[5] + (cmd[4] << 8) +
 425                                 (cmd[3] << 16) + (cmd[2] << 24);
 426                         num = cmd[8] + (cmd[7] << 8);
 427                 } else {
 428                         block = cmd[3] + (cmd[2] << 8) +
 429                                 ((cmd[1] & 0x1f) << 16);
 430                         num = cmd[4];
 431                 }
 432                 errsts = resp_read(SCpnt, upper_blk, block, num, devip);
 433                 if (inj_recovered && (0 == errsts)) {
 434                         mk_sense_buffer(devip, RECOVERED_ERROR,
 435                                         THRESHHOLD_EXCEEDED, 0, 18);
 436                         errsts = check_condition_result;
 437                 }
 438                 break;
 439         case REPORT_LUNS:       /* mandatory, ignore unit attention */
 440                 errsts = resp_report_luns(cmd, buff, bufflen, devip);
 441                 break;
 442         case WRITE_16:
 443         case WRITE_12:
 444         case WRITE_10:
 445         case WRITE_6:
 446                 if ((errsts = check_reset(SCpnt, devip)))
 447                         break;
 448                 upper_blk = 0;
 449                 if ((*cmd) == WRITE_16) {
 450                         upper_blk = cmd[5] + (cmd[4] << 8) +
 451                                     (cmd[3] << 16) + (cmd[2] << 24);
 452                         block = cmd[9] + (cmd[8] << 8) +
 453                                 (cmd[7] << 16) + (cmd[6] << 24);
 454                         num = cmd[13] + (cmd[12] << 8) +
 455                                 (cmd[11] << 16) + (cmd[10] << 24);
 456                 } else if ((*cmd) == WRITE_12) {
 457                         block = cmd[5] + (cmd[4] << 8) +
 458                                 (cmd[3] << 16) + (cmd[2] << 24);
 459                         num = cmd[9] + (cmd[8] << 8) +
 460                                 (cmd[7] << 16) + (cmd[6] << 24);
 461                 } else if ((*cmd) == WRITE_10) {
 462                         block = cmd[5] + (cmd[4] << 8) +
 463                                 (cmd[3] << 16) + (cmd[2] << 24);
 464                         num = cmd[8] + (cmd[7] << 8);
 465                 } else {
 466                         block = cmd[3] + (cmd[2] << 8) +
 467                                 ((cmd[1] & 0x1f) << 16);
 468                         num = cmd[4];
 469                 }
 470                 errsts = resp_write(SCpnt, upper_blk, block, num, devip);
 471                 if (inj_recovered && (0 == errsts)) {
 472                         mk_sense_buffer(devip, RECOVERED_ERROR,
 473                                         THRESHHOLD_EXCEEDED, 0, 18);
 474                         errsts = check_condition_result;
 475                 }
 476                 break;
 477         case MODE_SENSE:
 478         case MODE_SENSE_10:
 479                 if ((errsts = check_reset(SCpnt, devip)))
 480                         break;
 481                 errsts = resp_mode_sense(cmd, target, buff, bufflen, devip);
 482                 break;
 483         case SYNCHRONIZE_CACHE:
 484                 errsts = check_reset(SCpnt, devip);
 485                 memset(buff, 0, bufflen);
 486                 break;
 487         default:
 488                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 489                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
 490                                "supported\n", *cmd);
 491                 if ((errsts = check_reset(SCpnt, devip)))
 492                         break;  /* Unit attention takes precedence */
 493                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0, 18);
 494                 errsts = check_condition_result;
 495                 break;
 496         }
 497         return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
 498 }
 499
 500 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
 501 {
 502         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
 503                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
 504         }
 505         return -EINVAL;
 506         /* return -ENOTTY; // correct return but upsets fdisk */
 507 }
 508
 509 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip)
 510 {
 511         if (devip->reset) {
 512                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 513                         printk(KERN_INFO "scsi_debug: Reporting Unit "
 514                                "attention: power on reset\n");
 515                 devip->reset = 0;
 516                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0, 18);
 517                 return check_condition_result;
 518         }
 519         return 0;
 520 }
 521
 522 #define SDEBUG_LONG_INQ_SZ 96
 523 #define SDEBUG_MAX_INQ_ARR_SZ 128
 524
 525 static const char * vendor_id = "Linux   ";
 526 static const char * product_id = "scsi_debug      ";
 527 static const char * product_rev = "0004";
 528
 529 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 530                            const char * dev_id_str, int dev_id_str_len)
 531 {
 532         int num;
 533
 534         /* Two identification descriptors: */
 535         /* T10 vendor identifier field format (faked) */
 536         arr[0] = 0x2;   /* ASCII */
 537         arr[1] = 0x1;
 538         arr[2] = 0x0;
 539         memcpy(&arr[4], vendor_id, 8);
 540         memcpy(&arr[12], product_id, 16);
 541         memcpy(&arr[28], dev_id_str, dev_id_str_len);
 542         num = 8 + 16 + dev_id_str_len;
 543         arr[3] = num;
 544         num += 4;
 545         /* NAA IEEE registered identifier (faked) */
 546         arr[num] = 0x1; /* binary */
 547         arr[num + 1] = 0x3;
 548         arr[num + 2] = 0x0;
 549         arr[num + 3] = 0x8;
 550         arr[num + 4] = 0x51;    /* ieee company id=0x123456 (faked) */
 551         arr[num + 5] = 0x23;
 552         arr[num + 6] = 0x45;
 553         arr[num + 7] = 0x60;
 554         arr[num + 8] = (dev_id_num >> 24);
 555         arr[num + 9] = (dev_id_num >> 16) & 0xff;
 556         arr[num + 10] = (dev_id_num >> 8) & 0xff;
 557         arr[num + 11] = dev_id_num & 0xff;
 558         return num + 12;
 559 }
 560
 561 static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
 562                         int bufflen, struct sdebug_dev_info * devip)
 563 {
 564         unsigned char pq_pdt;
 565         unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
 566         int min_len = bufflen > SDEBUG_MAX_INQ_ARR_SZ ?
 567                         SDEBUG_MAX_INQ_ARR_SZ : bufflen;
 568
 569         if (bufflen < cmd[4])
 570                 printk(KERN_INFO "scsi_debug: inquiry: bufflen=%d "
 571                        "< alloc_length=%d\n", bufflen, (int)cmd[4]);
 572         memset(buff, 0, bufflen);
 573         memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
 574         pq_pdt = (scsi_debug_ptype & 0x1f);
 575         arr[0] = pq_pdt;
 576         if (0x2 & cmd[1]) {  /* CMDDT bit set */
 577                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 578                                 0, 18);
 579                 return check_condition_result;
 580         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
 581                 int dev_id_num, len;
 582                 char dev_id_str[6];
 583
 584                 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
 585                              (devip->target * 1000) + devip->lun;
 586                 len = scnprintf(dev_id_str, 6, "%d", dev_id_num);
 587                 if (0 == cmd[2]) { /* supported vital product data pages */
 588                         arr[3] = 3;
 589                         arr[4] = 0x0; /* this page */
 590                         arr[5] = 0x80; /* unit serial number */
 591                         arr[6] = 0x83; /* device identification */
 592                 } else if (0x80 == cmd[2]) { /* unit serial number */
 593                         arr[1] = 0x80;
 594                         arr[3] = len;
 595                         memcpy(&arr[4], dev_id_str, len);
 596                 } else if (0x83 == cmd[2]) { /* device identification */
 597                         arr[1] = 0x83;
 598                         arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
 599                                                  dev_id_str, len);
 600                 } else {
 601                         /* Illegal request, invalid field in cdb */
 602                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
 603                                         INVALID_FIELD_IN_CDB, 0, 18);
 604                         return check_condition_result;
 605                 }
 606                 memcpy(buff, arr, min_len);
 607                 return 0;
 608         }
 609         /* drops through here for a standard inquiry */
 610         arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;     /* Removable disk */
 611         arr[2] = scsi_debug_scsi_level;
 612         arr[3] = 2;    /* response_data_format==2 */
 613         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
 614         arr[6] = 0x1; /* claim: ADDR16 */
 615         arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
 616         memcpy(&arr[8], vendor_id, 8);
 617         memcpy(&arr[16], product_id, 16);
 618         memcpy(&arr[32], product_rev, 4);
 619         /* version descriptors (2 bytes each) follow */
 620         arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */
 621         arr[60] = 0x2; arr[61] = 0x60; /* SPC-2 */
 622         if (scsi_debug_ptype == 0) {
 623             arr[62] = 0x1; arr[63] = 0x80; /* SBC */
 624         } else if (scsi_debug_ptype == 1) {
 625             arr[62] = 0x2; arr[63] = 0x00; /* SSC */
 626         }
 627         memcpy(buff, arr, min_len);
 628         return 0;
 629 }
 630
 631 /* <<Following mode page info copied from ST318451LW>> */
 632
 633 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
 634 {       /* Read-Write Error Recovery page for mode_sense */
 635         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
 636                                         5, 0, 0xff, 0xff};
 637
 638         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
 639         if (1 == pcontrol)
 640                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
 641         return sizeof(err_recov_pg);
 642 }
 643
 644 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
 645 {       /* Disconnect-Reconnect page for mode_sense */
 646         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
 647                                          0, 0, 0, 0, 0, 0, 0, 0};
 648
 649         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
 650         if (1 == pcontrol)
 651                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
 652         return sizeof(disconnect_pg);
 653 }
 654
 655 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
 656 {       /* Format device page for mode_sense */
 657         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
 658                                      0, 0, 0, 0, 0, 0, 0, 0,
 659                                      0, 0, 0, 0, 0x40, 0, 0, 0};
 660
 661         memcpy(p, format_pg, sizeof(format_pg));
 662         p[10] = (sdebug_sectors_per >> 8) & 0xff;
 663         p[11] = sdebug_sectors_per & 0xff;
 664         p[12] = (SECT_SIZE >> 8) & 0xff;
 665         p[13] = SECT_SIZE & 0xff;
 666         if (DEV_REMOVEABLE(target))
 667                 p[20] |= 0x20; /* should agree with INQUIRY */
 668         if (1 == pcontrol)
 669                 memset(p + 2, 0, sizeof(format_pg) - 2);
 670         return sizeof(format_pg);
 671 }
 672
 673 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
 674 {       /* Caching page for mode_sense */
 675         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
 676                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
 677
 678         memcpy(p, caching_pg, sizeof(caching_pg));
 679         if (1 == pcontrol)
 680                 memset(p + 2, 0, sizeof(caching_pg) - 2);
 681         return sizeof(caching_pg);
 682 }
 683
 684 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
 685 {       /* Control mode page for mode_sense */
 686         unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 687                                      0, 0, 0x2, 0x4b};
 688
 689         if (scsi_debug_dsense)
 690                 ctrl_m_pg[2] |= 0x4;
 691         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
 692         if (1 == pcontrol)
 693                 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
 694         return sizeof(ctrl_m_pg);
 695 }
 696
 697 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
 698 {       /* Informational Exceptions control mode page for mode_sense */
 699         unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 700                                     0, 0, 0x0, 0x0};
 701         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
 702         if (1 == pcontrol)
 703                 memset(p + 2, 0, sizeof(iec_m_pg) - 2);
 704         return sizeof(iec_m_pg);
 705 }
 706
 707 #define SDEBUG_MAX_MSENSE_SZ 256
 708
 709 static int resp_mode_sense(unsigned char * cmd, int target,
 710                            unsigned char * buff, int bufflen,
 711                            struct sdebug_dev_info * devip)
 712 {
 713         unsigned char dbd;
 714         int pcontrol, pcode, subpcode;
 715         unsigned char dev_spec;
 716         int alloc_len, msense_6, offset, len;
 717         unsigned char * ap;
 718         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
 719         int min_len = bufflen > SDEBUG_MAX_MSENSE_SZ ?
 720                         SDEBUG_MAX_MSENSE_SZ : bufflen;
 721
 722         SCSI_LOG_LLQUEUE(3, printk("Mode sense ...(%p %d)\n", buff, bufflen));
 723         dbd = cmd[1] & 0x8;
 724         pcontrol = (cmd[2] & 0xc0) >> 6;
 725         pcode = cmd[2] & 0x3f;
 726         subpcode = cmd[3];
 727         msense_6 = (MODE_SENSE == cmd[0]);
 728         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
 729         if (bufflen < alloc_len)
 730                 printk(KERN_INFO "scsi_debug: mode_sense: bufflen=%d "
 731                        "< alloc_length=%d\n", bufflen, alloc_len);
 732         memset(buff, 0, bufflen);
 733         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
 734         if (0x3 == pcontrol) {  /* Saving values not supported */
 735                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
 736                                 0, 18);
 737                 return check_condition_result;
 738         }
 739         dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
 740         if (msense_6) {
 741                 arr[2] = dev_spec;
 742                 offset = 4;
 743         } else {
 744                 arr[3] = dev_spec;
 745                 offset = 8;
 746         }
 747         ap = arr + offset;
 748
 749         if (0 != subpcode) { /* TODO: Control Extension page */
 750                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 751                                 0, 18);
 752                 return check_condition_result;
 753         }
 754         switch (pcode) {
 755         case 0x1:       /* Read-Write error recovery page, direct access */
 756                 len = resp_err_recov_pg(ap, pcontrol, target);
 757                 offset += len;
 758                 break;
 759         case 0x2:       /* Disconnect-Reconnect page, all devices */
 760                 len = resp_disconnect_pg(ap, pcontrol, target);
 761                 offset += len;
 762                 break;
 763         case 0x3:       /* Format device page, direct access */
 764                 len = resp_format_pg(ap, pcontrol, target);
 765                 offset += len;
 766                 break;
 767         case 0x8:       /* Caching page, direct access */
 768                 len = resp_caching_pg(ap, pcontrol, target);
 769                 offset += len;
 770                 break;
 771         case 0xa:       /* Control Mode page, all devices */
 772                 len = resp_ctrl_m_pg(ap, pcontrol, target);
 773                 offset += len;
 774                 break;
 775         case 0x1c:      /* Informational Exceptions Mode page, all devices */
 776                 len = resp_iec_m_pg(ap, pcontrol, target);
 777                 offset += len;
 778                 break;
 779         case 0x3f:      /* Read all Mode pages */
 780                 len = resp_err_recov_pg(ap, pcontrol, target);
 781                 len += resp_disconnect_pg(ap + len, pcontrol, target);
 782                 len += resp_format_pg(ap + len, pcontrol, target);
 783                 len += resp_caching_pg(ap + len, pcontrol, target);
 784                 len += resp_ctrl_m_pg(ap + len, pcontrol, target);
 785                 len += resp_iec_m_pg(ap + len, pcontrol, target);
 786                 offset += len;
 787                 break;
 788         default:
 789                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 790                                 0, 18);
 791                 return check_condition_result;
 792         }
 793         if (msense_6)
 794                 arr[0] = offset - 1;
 795         else {
 796                 offset -= 2;
 797                 arr[0] = (offset >> 8) & 0xff;
 798                 arr[1] = offset & 0xff;
 799         }
 800         memcpy(buff, arr, min_len);
 801         return 0;
 802 }
 803
 804 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 805                      int num, struct sdebug_dev_info * devip)
 806 {
 807         unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
 808         int nbytes, sgcount;
 809         struct scatterlist *sgpnt = NULL;
 810         int bufflen = SCpnt->request_bufflen;
 811         unsigned long iflags;
 812
 813         if (upper_blk || (block + num > sdebug_capacity)) {
 814                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 815                                 0, 18);
 816                 return check_condition_result;
 817         }
 818         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
 819             (block <= OPT_MEDIUM_ERR_ADDR) &&
 820             ((block + num) > OPT_MEDIUM_ERR_ADDR)) {
 821                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
 822                                 0, 18);
 823                 /* claim unrecoverable read error */
 824                 return check_condition_result;
 825         }
 826         read_lock_irqsave(&atomic_rw, iflags);
 827         sgcount = 0;
 828         nbytes = bufflen;
 829         /* printk(KERN_INFO "scsi_debug_read: block=%d, tot_bufflen=%d\n",
 830                block, bufflen); */
 831         if (SCpnt->use_sg) {
 832                 sgcount = 0;
 833                 sgpnt = (struct scatterlist *) buff;
 834                 buff = scatg2virt(&sgpnt[sgcount]);
 835                 bufflen = sgpnt[sgcount].length;
 836         }
 837         do {
 838                 memcpy(buff, fake_storep + (block * SECT_SIZE), bufflen);
 839                 nbytes -= bufflen;
 840                 if (SCpnt->use_sg) {
 841                         block += bufflen >> POW2_SECT_SIZE;
 842                         sgcount++;
 843                         if (nbytes) {
 844                                 buff = scatg2virt(&sgpnt[sgcount]);
 845                                 bufflen = sgpnt[sgcount].length;
 846                         }
 847                 } else if (nbytes > 0)
 848                         printk(KERN_WARNING "scsi_debug:resp_read: unexpected "
 849                                "nbytes=%d\n", nbytes);
 850         } while (nbytes);
 851         read_unlock_irqrestore(&atomic_rw, iflags);
 852         return 0;
 853 }
 854
 855 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 856                       int num, struct sdebug_dev_info * devip)
 857 {
 858         unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
 859         int nbytes, sgcount;
 860         struct scatterlist *sgpnt = NULL;
 861         int bufflen = SCpnt->request_bufflen;
 862         unsigned long iflags;
 863
 864         if (upper_blk || (block + num > sdebug_capacity)) {
 865                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 866                                 0, 18);
 867                 return check_condition_result;
 868         }
 869
 870         write_lock_irqsave(&atomic_rw, iflags);
 871         sgcount = 0;
 872         nbytes = bufflen;
 873         if (SCpnt->use_sg) {
 874                 sgcount = 0;
 875                 sgpnt = (struct scatterlist *) buff;
 876                 buff = scatg2virt(&sgpnt[sgcount]);
 877                 bufflen = sgpnt[sgcount].length;
 878         }
 879         do {
 880                 memcpy(fake_storep + (block * SECT_SIZE), buff, bufflen);
 881
 882                 nbytes -= bufflen;
 883                 if (SCpnt->use_sg) {
 884                         block += bufflen >> POW2_SECT_SIZE;
 885                         sgcount++;
 886                         if (nbytes) {
 887                                 buff = scatg2virt(&sgpnt[sgcount]);
 888                                 bufflen = sgpnt[sgcount].length;
 889                         }
 890                 } else if (nbytes > 0)
 891                         printk(KERN_WARNING "scsi_debug:resp_write: "
 892                                "unexpected nbytes=%d\n", nbytes);
 893         } while (nbytes);
 894         write_unlock_irqrestore(&atomic_rw, iflags);
 895         return 0;
 896 }
 897
 898 static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
 899                             int bufflen, struct sdebug_dev_info * devip)
 900 {
 901         unsigned int alloc_len;
 902         int lun_cnt, i, upper;
 903         int select_report = (int)cmd[2];
 904         struct scsi_lun *one_lun;
 905
 906         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
 907         if ((alloc_len < 16) || (select_report > 2)) {
 908                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 909                                 0, 18);
 910                 return check_condition_result;
 911         }
 912         if (bufflen > 8) { /* can produce response with up to 16k luns
 913                               (lun 0 to lun 16383) */
 914                 memset(buff, 0, bufflen);
 915                 lun_cnt = scsi_debug_max_luns;
 916                 buff[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff;
 917                 buff[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff;
 918                 lun_cnt = min((int)((bufflen - 8) / sizeof(struct scsi_lun)),
 919                               lun_cnt);
 920                 one_lun = (struct scsi_lun *) &buff[8];
 921                 for (i = 0; i < lun_cnt; i++) {
 922                         upper = (i >> 8) & 0x3f;
 923                         if (upper)
 924                                 one_lun[i].scsi_lun[0] =
 925                                     (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
 926                         one_lun[i].scsi_lun[1] = i & 0xff;
 927                 }
 928         }
 929         return 0;
 930 }
 931
 932 /* When timer goes off this function is called. */
 933 static void timer_intr_handler(unsigned long indx)
 934 {
 935         struct sdebug_queued_cmd * sqcp;
 936         unsigned long iflags;
 937
 938         if (indx >= SCSI_DEBUG_CANQUEUE) {
 939                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
 940                        "large\n");
 941                 return;
 942         }
 943         spin_lock_irqsave(&queued_arr_lock, iflags);
 944         sqcp = &queued_arr[(int)indx];
 945         if (! sqcp->in_use) {
 946                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
 947                        "interrupt\n");
 948                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
 949                 return;
 950         }
 951         sqcp->in_use = 0;
 952         if (sqcp->done_funct) {
 953                 sqcp->a_cmnd->result = sqcp->scsi_result;
 954                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
 955         }
 956         sqcp->done_funct = NULL;
 957         spin_unlock_irqrestore(&queued_arr_lock, iflags);
 958 }
 959
 960 static int scsi_debug_slave_alloc(struct scsi_device * sdp)
 961 {
 962         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 963                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
 964                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 965         return 0;
 966 }
 967
 968 static int scsi_debug_slave_configure(struct scsi_device * sdp)
 969 {
 970         struct sdebug_dev_info * devip;
 971
 972         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 973                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
 974                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 975         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
 976                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
 977         devip = devInfoReg(sdp);
 978         sdp->hostdata = devip;
 979         if (sdp->host->cmd_per_lun)
 980                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
 981                                         sdp->host->cmd_per_lun);
 982         return 0;
 983 }
 984
 985 static void scsi_debug_slave_destroy(struct scsi_device * sdp)
 986 {
 987         struct sdebug_dev_info * devip =
 988                                 (struct sdebug_dev_info *)sdp->hostdata;
 989
 990         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 991                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
 992                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 993         if (devip) {
 994                 /* make this slot avaliable for re-use */
 995                 devip->used = 0;
 996                 sdp->hostdata = NULL;
 997         }
 998 }
 999
1000 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
1001 {
1002         struct sdebug_host_info * sdbg_host;
1003         struct sdebug_dev_info * open_devip = NULL;
1004         struct sdebug_dev_info * devip =
1005                         (struct sdebug_dev_info *)sdev->hostdata;
1006
1007         if (devip)
1008                 return devip;
1009         sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
1010         if(! sdbg_host) {
1011                 printk(KERN_ERR "Host info NULL\n");
1012                 return NULL;
1013         }
1014         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
1015                 if ((devip->used) && (devip->channel == sdev->channel) &&
1016                     (devip->target == sdev->id) &&
1017                     (devip->lun == sdev->lun))
1018                         return devip;
1019                 else {
1020                         if ((!devip->used) && (!open_devip))
1021                                 open_devip = devip;
1022                 }
1023         }
1024         if (NULL == open_devip) { /* try and make a new one */
1025                 open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL);
1026                 if (NULL == open_devip) {
1027                         printk(KERN_ERR "%s: out of memory at line %d\n",
1028                                 __FUNCTION__, __LINE__);
1029                         return NULL;
1030                 }
1031                 memset(open_devip, 0, sizeof(*open_devip));
1032                 open_devip->sdbg_host = sdbg_host;
1033                 list_add_tail(&open_devip->dev_list,
1034                 &sdbg_host->dev_info_list);
1035         }
1036         if (open_devip) {
1037                 open_devip->channel = sdev->channel;
1038                 open_devip->target = sdev->id;
1039                 open_devip->lun = sdev->lun;
1040                 open_devip->sdbg_host = sdbg_host;
1041                 open_devip->reset = 1;
1042                 open_devip->used = 1;
1043                 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
1044                 open_devip->sense_buff[0] = 0x70;
1045                 return open_devip;
1046         }
1047         return NULL;
1048 }
1049
1050 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
1051                             int asc, int asq, int inbandLen)
1052 {
1053         unsigned char * sbuff;
1054
1055         sbuff = devip->sense_buff;
1056         memset(sbuff, 0, SDEBUG_SENSE_LEN);
1057         if (scsi_debug_dsense) {
1058                 sbuff[0] = 0x72;  /* descriptor, current */
1059                 sbuff[1] = key;
1060                 sbuff[2] = asc;
1061                 sbuff[3] = asq;
1062         } else {
1063                 if (inbandLen > SDEBUG_SENSE_LEN)
1064                         inbandLen = SDEBUG_SENSE_LEN;
1065                 sbuff[0] = 0x70;  /* fixed, current */
1066                 sbuff[2] = key;
1067                 sbuff[7] = (inbandLen > 7) ? (inbandLen - 8) : 0;
1068                 sbuff[12] = asc;
1069                 sbuff[13] = asq;
1070         }
1071         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1072                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
1073                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
1074 }
1075
1076 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
1077 {
1078         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1079                 printk(KERN_INFO "scsi_debug: abort\n");
1080         ++num_aborts;
1081         stop_queued_cmnd(SCpnt);
1082         return SUCCESS;
1083 }
1084
1085 static int scsi_debug_biosparam(struct scsi_device *sdev,
1086                 struct block_device * bdev, sector_t capacity, int *info)
1087 {
1088         int res;
1089         unsigned char *buf;
1090
1091         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1092                 printk(KERN_INFO "scsi_debug: biosparam\n");
1093         buf = scsi_bios_ptable(bdev);
1094         if (buf) {
1095                 res = scsi_partsize(buf, capacity,
1096                                     &info[2], &info[0], &info[1]);
1097                 kfree(buf);
1098                 if (! res)
1099                         return res;
1100         }
1101         info[0] = sdebug_heads;
1102         info[1] = sdebug_sectors_per;
1103         info[2] = sdebug_cylinders_per;
1104         return 0;
1105 }
1106
1107 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
1108 {
1109         struct sdebug_dev_info * devip;
1110
1111         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1112                 printk(KERN_INFO "scsi_debug: device_reset\n");
1113         ++num_dev_resets;
1114         if (SCpnt) {
1115                 devip = devInfoReg(SCpnt->device);
1116                 if (devip)
1117                         devip->reset = 1;
1118         }
1119         return SUCCESS;
1120 }
1121
1122 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
1123 {
1124         struct sdebug_host_info *sdbg_host;
1125         struct sdebug_dev_info * dev_info;
1126         struct scsi_device * sdp;
1127         struct Scsi_Host * hp;
1128
1129         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1130                 printk(KERN_INFO "scsi_debug: bus_reset\n");
1131         ++num_bus_resets;
1132         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
1133                 sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
1134                 if (sdbg_host) {
1135                         list_for_each_entry(dev_info,
1136                                             &sdbg_host->dev_info_list,
1137                                             dev_list)
1138                                 dev_info->reset = 1;
1139                 }
1140         }
1141         return SUCCESS;
1142 }
1143
1144 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
1145 {
1146         struct sdebug_host_info * sdbg_host;
1147         struct sdebug_dev_info * dev_info;
1148
1149         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1150                 printk(KERN_INFO "scsi_debug: host_reset\n");
1151         ++num_host_resets;
1152         spin_lock(&sdebug_host_list_lock);
1153         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1154                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
1155                                     dev_list)
1156                         dev_info->reset = 1;
1157         }
1158         spin_unlock(&sdebug_host_list_lock);
1159         stop_all_queued();
1160         return SUCCESS;
1161 }
1162
1163 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
1164 static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
1165 {
1166         unsigned long iflags;
1167         int k;
1168         struct sdebug_queued_cmd * sqcp;
1169
1170         spin_lock_irqsave(&queued_arr_lock, iflags);
1171         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1172                 sqcp = &queued_arr[k];
1173                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
1174                         del_timer_sync(&sqcp->cmnd_timer);
1175                         sqcp->in_use = 0;
1176                         sqcp->a_cmnd = NULL;
1177                         break;
1178                 }
1179         }
1180         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1181         return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
1182 }
1183
1184 /* Deletes (stops) timers of all queued commands */
1185 static void stop_all_queued(void)
1186 {
1187         unsigned long iflags;
1188         int k;
1189         struct sdebug_queued_cmd * sqcp;
1190
1191         spin_lock_irqsave(&queued_arr_lock, iflags);
1192         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1193                 sqcp = &queued_arr[k];
1194                 if (sqcp->in_use && sqcp->a_cmnd) {
1195                         del_timer_sync(&sqcp->cmnd_timer);
1196                         sqcp->in_use = 0;
1197                         sqcp->a_cmnd = NULL;
1198                 }
1199         }
1200         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1201 }
1202
1203 /* Initializes timers in queued array */
1204 static void __init init_all_queued(void)
1205 {
1206         unsigned long iflags;
1207         int k;
1208         struct sdebug_queued_cmd * sqcp;
1209
1210         spin_lock_irqsave(&queued_arr_lock, iflags);
1211         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1212                 sqcp = &queued_arr[k];
1213                 init_timer(&sqcp->cmnd_timer);
1214                 sqcp->in_use = 0;
1215                 sqcp->a_cmnd = NULL;
1216         }
1217         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1218 }
1219
1220 static void __init sdebug_build_parts(unsigned char * ramp)
1221 {
1222         struct partition * pp;
1223         int starts[SDEBUG_MAX_PARTS + 2];
1224         int sectors_per_part, num_sectors, k;
1225         int heads_by_sects, start_sec, end_sec;
1226
1227         /* assume partition table already zeroed */
1228         if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
1229                 return;
1230         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
1231                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
1232                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
1233                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
1234         }
1235         num_sectors = (int)(sdebug_store_size / SECT_SIZE);
1236         sectors_per_part = (num_sectors - sdebug_sectors_per)
1237                            / scsi_debug_num_parts;
1238         heads_by_sects = sdebug_heads * sdebug_sectors_per;
1239         starts[0] = sdebug_sectors_per;
1240         for (k = 1; k < scsi_debug_num_parts; ++k)
1241                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
1242                             * heads_by_sects;
1243         starts[scsi_debug_num_parts] = num_sectors;
1244         starts[scsi_debug_num_parts + 1] = 0;
1245
1246         ramp[510] = 0x55;       /* magic partition markings */
1247         ramp[511] = 0xAA;
1248         pp = (struct partition *)(ramp + 0x1be);
1249         for (k = 0; starts[k + 1]; ++k, ++pp) {
1250                 start_sec = starts[k];
1251                 end_sec = starts[k + 1] - 1;
1252                 pp->boot_ind = 0;
1253
1254                 pp->cyl = start_sec / heads_by_sects;
1255                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
1256                            / sdebug_sectors_per;
1257                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
1258
1259                 pp->end_cyl = end_sec / heads_by_sects;
1260                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
1261                                / sdebug_sectors_per;
1262                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
1263
1264                 pp->start_sect = start_sec;
1265                 pp->nr_sects = end_sec - start_sec + 1;
1266                 pp->sys_ind = 0x83;     /* plain Linux partition */
1267         }
1268 }
1269
1270 static int schedule_resp(struct scsi_cmnd * cmnd,
1271                          struct sdebug_dev_info * devip,
1272                          done_funct_t done, int scsi_result, int delta_jiff)
1273 {
1274         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
1275                 if (scsi_result) {
1276                         struct scsi_device * sdp = cmnd->device;
1277
1278                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
1279                                "non-zero result=0x%x\n", sdp->host->host_no,
1280                                sdp->channel, sdp->id, sdp->lun, scsi_result);
1281                 }
1282         }
1283         if (cmnd && devip) {
1284                 /* simulate autosense by this driver */
1285                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
1286                         memcpy(cmnd->sense_buffer, devip->sense_buff,
1287                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
1288                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
1289         }
1290         if (delta_jiff <= 0) {
1291                 if (cmnd)
1292                         cmnd->result = scsi_result;
1293                 if (done)
1294                         done(cmnd);
1295                 return 0;
1296         } else {
1297                 unsigned long iflags;
1298                 int k;
1299                 struct sdebug_queued_cmd * sqcp = NULL;
1300
1301                 spin_lock_irqsave(&queued_arr_lock, iflags);
1302                 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1303                         sqcp = &queued_arr[k];
1304                         if (! sqcp->in_use)
1305                                 break;
1306                 }
1307                 if (k >= SCSI_DEBUG_CANQUEUE) {
1308                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1309                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
1310                         return 1;       /* report busy to mid level */
1311                 }
1312                 sqcp->in_use = 1;
1313                 sqcp->a_cmnd = cmnd;
1314                 sqcp->scsi_result = scsi_result;
1315                 sqcp->done_funct = done;
1316                 sqcp->cmnd_timer.function = timer_intr_handler;
1317                 sqcp->cmnd_timer.data = k;
1318                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
1319                 add_timer(&sqcp->cmnd_timer);
1320                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1321                 if (cmnd)
1322                         cmnd->result = 0;
1323                 return 0;
1324         }
1325 }
1326
1327 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1328  * of sysfs parameters (which module_param doesn't yet support).
1329  * Sysfs parameters defined explicitly below.
1330  */
1331 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
1332 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
1333 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
1334 module_param_named(dsense, scsi_debug_dsense, int, 0);
1335 module_param_named(every_nth, scsi_debug_every_nth, int, 0);
1336 module_param_named(max_luns, scsi_debug_max_luns, int, 0);
1337 module_param_named(num_parts, scsi_debug_num_parts, int, 0);
1338 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
1339 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
1340 module_param_named(ptype, scsi_debug_ptype, int, 0);
1341 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);
1342
1343 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
1344 MODULE_DESCRIPTION("SCSI debug adapter driver");
1345 MODULE_LICENSE("GPL");
1346 MODULE_VERSION(SCSI_DEBUG_VERSION);
1347
1348 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
1349 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
1350 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
1351 MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)");
1352 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
1353 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
1354 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
1355 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
1356 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
1357 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
1358 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=4[SPC-2])");
1359
1360
1361 static char sdebug_info[256];
1362
1363 static const char * scsi_debug_info(struct Scsi_Host * shp)
1364 {
1365         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
1366                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
1367                 scsi_debug_version_date, scsi_debug_dev_size_mb,
1368                 scsi_debug_opts);
1369         return sdebug_info;
1370 }
1371
1372 /* scsi_debug_proc_info
1373  * Used if the driver currently has no own support for /proc/scsi
1374  */
1375 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
1376                                 int length, int inout)
1377 {
1378         int len, pos, begin;
1379         int orig_length;
1380
1381         orig_length = length;
1382
1383         if (inout == 1) {
1384                 char arr[16];
1385                 int minLen = length > 15 ? 15 : length;
1386
1387                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1388                         return -EACCES;
1389                 memcpy(arr, buffer, minLen);
1390                 arr[minLen] = '\0';
1391                 if (1 != sscanf(arr, "%d", &pos))
1392                         return -EINVAL;
1393                 scsi_debug_opts = pos;
1394                 if (scsi_debug_every_nth > 0)
1395                         scsi_debug_cmnd_count = 0;
1396                 return length;
1397         }
1398         begin = 0;
1399         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
1400             "%s [%s]\n"
1401             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
1402             "every_nth=%d(curr:%d)\n"
1403             "delay=%d, max_luns=%d, scsi_level=%d\n"
1404             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
1405             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
1406             "host_resets=%d\n",
1407             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
1408             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
1409             scsi_debug_cmnd_count, scsi_debug_delay,
1410             scsi_debug_max_luns, scsi_debug_scsi_level,
1411             SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
1412             num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
1413         if (pos < offset) {
1414                 len = 0;
1415                 begin = pos;
1416         }
1417         *start = buffer + (offset - begin);     /* Start of wanted data */
1418         len -= (offset - begin);
1419         if (len > length)
1420                 len = length;
1421         return len;
1422 }
1423
1424 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
1425 {
1426         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
1427 }
1428
1429 static ssize_t sdebug_delay_store(struct device_driver * ddp,
1430                                   const char * buf, size_t count)
1431 {
1432         int delay;
1433         char work[20];
1434
1435         if (1 == sscanf(buf, "%10s", work)) {
1436                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
1437                         scsi_debug_delay = delay;
1438                         return count;
1439                 }
1440         }
1441         return -EINVAL;
1442 }
1443 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
1444             sdebug_delay_store);
1445
1446 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
1447 {
1448         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
1449 }
1450
1451 static ssize_t sdebug_opts_store(struct device_driver * ddp,
1452                                  const char * buf, size_t count)
1453 {
1454         int opts;
1455         char work[20];
1456
1457         if (1 == sscanf(buf, "%10s", work)) {
1458                 if (0 == strnicmp(work,"0x", 2)) {
1459                         if (1 == sscanf(&work[2], "%x", &opts))
1460                                 goto opts_done;
1461                 } else {
1462                         if (1 == sscanf(work, "%d", &opts))
1463                                 goto opts_done;
1464                 }
1465         }
1466         return -EINVAL;
1467 opts_done:
1468         scsi_debug_opts = opts;
1469         scsi_debug_cmnd_count = 0;
1470         return count;
1471 }
1472 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
1473             sdebug_opts_store);
1474
1475 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
1476 {
1477         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
1478 }
1479 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
1480                                   const char * buf, size_t count)
1481 {
1482         int n;
1483
1484         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1485                 scsi_debug_ptype = n;
1486                 return count;
1487         }
1488         return -EINVAL;
1489 }
1490 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
1491
1492 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
1493 {
1494         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
1495 }
1496 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
1497                                   const char * buf, size_t count)
1498 {
1499         int n;
1500
1501         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1502                 scsi_debug_dsense = n;
1503                 return count;
1504         }
1505         return -EINVAL;
1506 }
1507 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
1508             sdebug_dsense_store);
1509
1510 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
1511 {
1512         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
1513 }
1514 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
1515                                      const char * buf, size_t count)
1516 {
1517         int n;
1518
1519         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1520                 scsi_debug_num_tgts = n;
1521                 sdebug_max_tgts_luns();
1522                 return count;
1523         }
1524         return -EINVAL;
1525 }
1526 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
1527             sdebug_num_tgts_store);
1528
1529 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
1530 {
1531         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
1532 }
1533 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
1534
1535 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
1536 {
1537         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
1538 }
1539 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
1540
1541 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
1542 {
1543         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
1544 }
1545 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
1546                                       const char * buf, size_t count)
1547 {
1548         int nth;
1549
1550         if ((count > 0) && (1 == sscanf(buf, "%d", &nth)) && (nth >= 0)) {
1551                 scsi_debug_every_nth = nth;
1552                 scsi_debug_cmnd_count = 0;
1553                 return count;
1554         }
1555         return -EINVAL;
1556 }
1557 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
1558             sdebug_every_nth_store);
1559
1560 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
1561 {
1562         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
1563 }
1564 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
1565                                      const char * buf, size_t count)
1566 {
1567         int n;
1568
1569         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1570                 scsi_debug_max_luns = n;
1571                 sdebug_max_tgts_luns();
1572                 return count;
1573         }
1574         return -EINVAL;
1575 }
1576 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
1577             sdebug_max_luns_store);
1578
1579 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
1580 {
1581         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
1582 }
1583 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
1584
1585 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
1586 {
1587         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
1588 }
1589
1590 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
1591                                      const char * buf, size_t count)
1592 {
1593         int delta_hosts;
1594         char work[20];
1595
1596         if (1 != sscanf(buf, "%10s", work))
1597                 return -EINVAL;
1598         {       /* temporary hack around sscanf() problem with -ve nums */
1599                 int neg = 0;
1600
1601                 if ('-' == *work)
1602                         neg = 1;
1603                 if (1 != sscanf(work + neg, "%d", &delta_hosts))
1604                         return -EINVAL;
1605                 if (neg)
1606                         delta_hosts = -delta_hosts;
1607         }
1608         if (delta_hosts > 0) {
1609                 do {
1610                         sdebug_add_adapter();
1611                 } while (--delta_hosts);
1612         } else if (delta_hosts < 0) {
1613                 do {
1614                         sdebug_remove_adapter();
1615                 } while (++delta_hosts);
1616         }
1617         return count;
1618 }
1619 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
1620             sdebug_add_host_store);
1621
1622 static void do_create_driverfs_files(void)
1623 {
1624         driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1625         driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
1626         driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1627         driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1628         driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1629         driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1630         driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1631         driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1632         driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
1633         driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1634 }
1635
1636 static void do_remove_driverfs_files(void)
1637 {
1638         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1639         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
1640         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1641         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1642         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1643         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1644         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1645         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1646         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
1647         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1648 }
1649
1650 static int __init scsi_debug_init(void)
1651 {
1652         unsigned long sz;
1653         int host_to_add;
1654         int k;
1655
1656         if (scsi_debug_dev_size_mb < 1)
1657                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
1658         sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576;
1659         sdebug_capacity = sdebug_store_size / SECT_SIZE;
1660
1661         /* play around with geometry, don't waste too much on track 0 */
1662         sdebug_heads = 8;
1663         sdebug_sectors_per = 32;
1664         if (scsi_debug_dev_size_mb >= 16)
1665                 sdebug_heads = 32;
1666         else if (scsi_debug_dev_size_mb >= 256)
1667                 sdebug_heads = 64;
1668         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1669                                (sdebug_sectors_per * sdebug_heads);
1670         if (sdebug_cylinders_per >= 1024) {
1671                 /* other LLDs do this; implies >= 1GB ram disk ... */
1672                 sdebug_heads = 255;
1673                 sdebug_sectors_per = 63;
1674                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1675                                (sdebug_sectors_per * sdebug_heads);
1676         }
1677
1678         sz = sdebug_store_size;
1679         fake_storep = vmalloc(sz);
1680         if (NULL == fake_storep) {
1681                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
1682                 return -ENOMEM;
1683         }
1684         memset(fake_storep, 0, sz);
1685         if (scsi_debug_num_parts > 0)
1686                 sdebug_build_parts(fake_storep);
1687
1688         init_all_queued();
1689
1690         device_register(&pseudo_primary);
1691         bus_register(&pseudo_lld_bus);
1692         driver_register(&sdebug_driverfs_driver);
1693         do_create_driverfs_files();
1694
1695         sdebug_driver_template.proc_name = (char *)sdebug_proc_name;
1696
1697         host_to_add = scsi_debug_add_host;
1698         scsi_debug_add_host = 0;
1699
1700         for (k = 0; k < host_to_add; k++) {
1701                 if (sdebug_add_adapter()) {
1702                         printk(KERN_ERR "scsi_debug_init: "
1703                                "sdebug_add_adapter failed k=%d\n", k);
1704                         break;
1705                 }
1706         }
1707
1708         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
1709                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
1710                        scsi_debug_add_host);
1711         }
1712         return 0;
1713 }
1714
1715 static void __exit scsi_debug_exit(void)
1716 {
1717         int k = scsi_debug_add_host;
1718
1719         stop_all_queued();
1720         for (; k; k--)
1721                 sdebug_remove_adapter();
1722         do_remove_driverfs_files();
1723         driver_unregister(&sdebug_driverfs_driver);
1724         bus_unregister(&pseudo_lld_bus);
1725         device_unregister(&pseudo_primary);
1726
1727         vfree(fake_storep);
1728 }
1729
1730 device_initcall(scsi_debug_init);
1731 module_exit(scsi_debug_exit);
1732
1733 void pseudo_0_release(struct device * dev)
1734 {
1735         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1736                 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
1737 }
1738
1739 static struct device pseudo_primary = {
1740         .bus_id         = "pseudo_0",
1741         .release        = pseudo_0_release,
1742 };
1743
1744 static int pseudo_lld_bus_match(struct device *dev,
1745                           struct device_driver *dev_driver)
1746 {
1747         return 1;
1748 }
1749
1750 static struct bus_type pseudo_lld_bus = {
1751         .name = "pseudo",
1752         .match = pseudo_lld_bus_match,
1753 };
1754
1755 static void sdebug_release_adapter(struct device * dev)
1756 {
1757         struct sdebug_host_info *sdbg_host;
1758
1759         sdbg_host = to_sdebug_host(dev);
1760         kfree(sdbg_host);
1761 }
1762
1763 static int sdebug_add_adapter(void)
1764 {
1765         int k, devs_per_host;
1766         int error = 0;
1767         struct sdebug_host_info *sdbg_host;
1768         struct sdebug_dev_info *sdbg_devinfo;
1769         struct list_head *lh, *lh_sf;
1770
1771         sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
1772
1773         if (NULL == sdbg_host) {
1774                 printk(KERN_ERR "%s: out of memory at line %d\n",
1775                        __FUNCTION__, __LINE__);
1776                 return -ENOMEM;
1777         }
1778
1779         memset(sdbg_host, 0, sizeof(*sdbg_host));
1780         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
1781
1782         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
1783         for (k = 0; k < devs_per_host; k++) {
1784                 sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
1785                 if (NULL == sdbg_devinfo) {
1786                         printk(KERN_ERR "%s: out of memory at line %d\n",
1787                                __FUNCTION__, __LINE__);
1788                         error = -ENOMEM;
1789                         goto clean;
1790                 }
1791                 memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
1792                 sdbg_devinfo->sdbg_host = sdbg_host;
1793                 list_add_tail(&sdbg_devinfo->dev_list,
1794                               &sdbg_host->dev_info_list);
1795         }
1796
1797         spin_lock(&sdebug_host_list_lock);
1798         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
1799         spin_unlock(&sdebug_host_list_lock);
1800
1801         sdbg_host->dev.bus = &pseudo_lld_bus;
1802         sdbg_host->dev.parent = &pseudo_primary;
1803         sdbg_host->dev.release = &sdebug_release_adapter;
1804         sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
1805
1806         error = device_register(&sdbg_host->dev);
1807
1808         if (error)
1809                 goto clean;
1810
1811         ++scsi_debug_add_host;
1812         return error;
1813
1814 clean:
1815         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1816                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1817                                           dev_list);
1818                 list_del(&sdbg_devinfo->dev_list);
1819                 kfree(sdbg_devinfo);
1820         }
1821
1822         kfree(sdbg_host);
1823         return error;
1824 }
1825
1826 static void sdebug_remove_adapter(void)
1827 {
1828         struct sdebug_host_info * sdbg_host = NULL;
1829
1830         spin_lock(&sdebug_host_list_lock);
1831         if (!list_empty(&sdebug_host_list)) {
1832                 sdbg_host = list_entry(sdebug_host_list.prev,
1833                                        struct sdebug_host_info, host_list);
1834                 list_del(&sdbg_host->host_list);
1835         }
1836         spin_unlock(&sdebug_host_list_lock);
1837
1838         if (!sdbg_host)
1839                 return;
1840
1841         device_unregister(&sdbg_host->dev);
1842         --scsi_debug_add_host;
1843 }
1844
1845 static int sdebug_driver_probe(struct device * dev)
1846 {
1847         int error = 0;
1848         struct sdebug_host_info *sdbg_host;
1849         struct Scsi_Host *hpnt;
1850
1851         sdbg_host = to_sdebug_host(dev);
1852
1853         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
1854         if (NULL == hpnt) {
1855                 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
1856                 error = -ENODEV;
1857                 return error;
1858         }
1859
1860         sdbg_host->shost = hpnt;
1861         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
1862         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
1863                 hpnt->max_id = scsi_debug_num_tgts + 1;
1864         else
1865                 hpnt->max_id = scsi_debug_num_tgts;
1866         hpnt->max_lun = scsi_debug_max_luns;
1867
1868         error = scsi_add_host(hpnt, &sdbg_host->dev);
1869         if (error) {
1870                 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
1871                 error = -ENODEV;
1872                 scsi_host_put(hpnt);
1873         } else
1874                 scsi_scan_host(hpnt);
1875
1876
1877         return error;
1878 }
1879
1880 static int sdebug_driver_remove(struct device * dev)
1881 {
1882         struct list_head *lh, *lh_sf;
1883         struct sdebug_host_info *sdbg_host;
1884         struct sdebug_dev_info *sdbg_devinfo;
1885
1886         sdbg_host = to_sdebug_host(dev);
1887
1888         if (!sdbg_host) {
1889                 printk(KERN_ERR "%s: Unable to locate host info\n",
1890                        __FUNCTION__);
1891                 return -ENODEV;
1892         }
1893
1894         scsi_remove_host(sdbg_host->shost);
1895
1896         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1897                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1898                                           dev_list);
1899                 list_del(&sdbg_devinfo->dev_list);
1900                 kfree(sdbg_devinfo);
1901         }
1902
1903         scsi_host_put(sdbg_host->shost);
1904         return 0;
1905 }
1906
1907 static void sdebug_max_tgts_luns(void)
1908 {
1909         struct sdebug_host_info * sdbg_host;
1910         struct Scsi_Host *hpnt;
1911
1912         spin_lock(&sdebug_host_list_lock);
1913         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1914                 hpnt = sdbg_host->shost;
1915                 if ((hpnt->this_id >= 0) &&
1916                     (scsi_debug_num_tgts > hpnt->this_id))
1917                         hpnt->max_id = scsi_debug_num_tgts + 1;
1918                 else
1919                         hpnt->max_id = scsi_debug_num_tgts;
1920                 hpnt->max_lun = scsi_debug_max_luns;
1921         }
1922         spin_unlock(&sdebug_host_list_lock);
1923 }