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 "hosts.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 static const char * scsi_debug_version_str = "Version: 1.71 (20031007)";
  59
  60 /* Additional Sense Code (ASC) used */
  61 #define NO_ADDED_SENSE 0x0
  62 #define UNRECOVERED_READ_ERR 0x11
  63 #define INVALID_OPCODE 0x20
  64 #define ADDR_OUT_OF_RANGE 0x21
  65 #define INVALID_FIELD_IN_CDB 0x24
  66 #define POWERON_RESET 0x29
  67 #define SAVING_PARAMS_UNSUP 0x39
  68 #define THRESHHOLD_EXCEEDED 0x5d
  69
  70 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
  71
  72 /* Default values for driver parameters */
  73 #define DEF_NUM_HOST   1
  74 #define DEF_NUM_TGTS   1
  75 #define DEF_MAX_LUNS   1
  76 /* With these defaults, this driver will make 1 host with 1 target
  77  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  78  */
  79 #define DEF_DEV_SIZE_MB   8
  80 #define DEF_EVERY_NTH   0
  81 #define DEF_DELAY   1
  82 #define DEF_SCSI_LEVEL   3
  83 #define DEF_OPTS   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
  96 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
  97  * sector on read commands: */
  98 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
  99
 100 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
 101  * or "peripheral device" addressing (value 0) */
 102 #define SAM2_LUN_ADDRESS_METHOD 0
 103
 104 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
 105 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
 106 static int scsi_debug_opts = DEF_OPTS;
 107 static int scsi_debug_every_nth = DEF_EVERY_NTH;
 108 static int scsi_debug_cmnd_count = 0;
 109 static int scsi_debug_delay = DEF_DELAY;
 110 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 111 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
 112 static int scsi_debug_add_host = DEF_NUM_HOST;
 113
 114 #define DEV_READONLY(TGT)      (0)
 115 #define DEV_REMOVEABLE(TGT)    (0)
 116 #define PERIPH_DEVICE_TYPE(TGT) (TYPE_DISK);
 117
 118 static unsigned long sdebug_store_size; /* in bytes */
 119 static sector_t sdebug_capacity;        /* in sectors */
 120
 121 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
 122    may still need them */
 123 static int sdebug_heads;                /* heads per disk */
 124 static int sdebug_cylinders_per;        /* cylinders per surface */
 125 static int sdebug_sectors_per;          /* sectors per cylinder */
 126
 127 /* default sector size is 512 bytes, 2**9 bytes */
 128 #define POW2_SECT_SIZE 9
 129 #define SECT_SIZE (1 << POW2_SECT_SIZE)
 130 #define SECT_SIZE_PER(TGT) SECT_SIZE
 131
 132 #define SDEBUG_SENSE_LEN 32
 133
 134 struct sdebug_dev_info {
 135         struct list_head dev_list;
 136         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
 137         unsigned int channel;
 138         unsigned int target;
 139         unsigned int lun;
 140         struct sdebug_host_info *sdbg_host;
 141         char reset;
 142         char used;
 143 };
 144
 145 struct sdebug_host_info {
 146         struct list_head host_list;
 147         struct Scsi_Host *shost;
 148         struct device dev;
 149         struct list_head dev_info_list;
 150 };
 151
 152 #define to_sdebug_host(d)       \
 153         container_of(d, struct sdebug_host_info, dev)
 154
 155 static LIST_HEAD(sdebug_host_list);
 156 static spinlock_t sdebug_host_list_lock = SPIN_LOCK_UNLOCKED;
 157
 158 typedef void (* done_funct_t) (struct scsi_cmnd *);
 159
 160 struct sdebug_queued_cmd {
 161         int in_use;
 162         struct timer_list cmnd_timer;
 163         done_funct_t done_funct;
 164         struct scsi_cmnd * a_cmnd;
 165         int scsi_result;
 166 };
 167 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 168
 169 static Scsi_Host_Template sdebug_driver_template = {
 170         .proc_info =            scsi_debug_proc_info,
 171         .name =                 "SCSI DEBUG",
 172         .info =                 scsi_debug_info,
 173         .slave_alloc =          scsi_debug_slave_alloc,
 174         .slave_configure =      scsi_debug_slave_configure,
 175         .slave_destroy =        scsi_debug_slave_destroy,
 176         .ioctl =                scsi_debug_ioctl,
 177         .queuecommand =         scsi_debug_queuecommand,
 178         .eh_abort_handler =     scsi_debug_abort,
 179         .eh_bus_reset_handler = scsi_debug_bus_reset,
 180         .eh_device_reset_handler = scsi_debug_device_reset,
 181         .eh_host_reset_handler = scsi_debug_host_reset,
 182         .bios_param =           scsi_debug_biosparam,
 183         .can_queue =            SCSI_DEBUG_CANQUEUE,
 184         .this_id =              7,
 185         .sg_tablesize =         64,
 186         .cmd_per_lun =          3,
 187         .max_sectors =          4096,
 188         .unchecked_isa_dma =    0,
 189         .use_clustering =       ENABLE_CLUSTERING,
 190         .module =               THIS_MODULE,
 191 };
 192
 193 static unsigned char * fake_storep;     /* ramdisk storage */
 194
 195 static unsigned char spare_buff[SDEBUG_SENSE_LEN];
 196
 197 static int num_aborts = 0;
 198 static int num_dev_resets = 0;
 199 static int num_bus_resets = 0;
 200 static int num_host_resets = 0;
 201
 202 static spinlock_t queued_arr_lock = SPIN_LOCK_UNLOCKED;
 203 static rwlock_t atomic_rw = RW_LOCK_UNLOCKED;
 204
 205 static char sdebug_proc_name[] = "scsi_debug";
 206
 207 static int sdebug_driver_probe(struct device *);
 208 static int sdebug_driver_remove(struct device *);
 209 static struct bus_type pseudo_lld_bus;
 210
 211 static struct device_driver sdebug_driverfs_driver = {
 212         .name           = sdebug_proc_name,
 213         .bus            = &pseudo_lld_bus,
 214         .probe          = sdebug_driver_probe,
 215         .remove         = sdebug_driver_remove,
 216 };
 217
 218 static const int check_condition_result =
 219                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 220
 221 /* function declarations */
 222 static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
 223                         int bufflen, struct sdebug_dev_info * devip);
 224 static int resp_mode_sense(unsigned char * cmd, int target,
 225                            unsigned char * buff, int bufflen,
 226                            struct sdebug_dev_info * devip);
 227 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 228                      int num, struct sdebug_dev_info * devip);
 229 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 230                       int num, struct sdebug_dev_info * devip);
 231 static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
 232                             int bufflen, struct sdebug_dev_info * devip);
 233 static void timer_intr_handler(unsigned long);
 234 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
 235 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
 236                             int asc, int asq, int inbandLen);
 237 static int check_reset(struct scsi_cmnd * SCpnt,
 238                        struct sdebug_dev_info * devip);
 239 static int schedule_resp(struct scsi_cmnd * cmnd,
 240                          struct sdebug_dev_info * devip,
 241                          done_funct_t done, int scsi_result, int delta_jiff);
 242 static void init_all_queued(void);
 243 static void stop_all_queued(void);
 244 static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
 245 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 246                            const char * dev_id_str, int dev_id_str_len);
 247 static void do_create_driverfs_files(void);
 248 static void do_remove_driverfs_files(void);
 249
 250 static int sdebug_add_adapter(void);
 251 static void sdebug_remove_adapter(void);
 252 static struct device pseudo_primary;
 253 static struct bus_type pseudo_lld_bus;
 254
 255 static unsigned char * scatg2virt(const struct scatterlist * sclp)
 256 {
 257         if (NULL == sclp)
 258                 return NULL;
 259         else if (sclp->page)
 260                 return (unsigned char *)page_address(sclp->page) +
 261                        sclp->offset;
 262         else
 263                 return NULL;
 264 }
 265
 266 static
 267 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
 268 {
 269         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
 270         int block, upper_blk, num;
 271         unsigned char *buff;
 272         int errsts = 0;
 273         int target = SCpnt->device->id;
 274         int bufflen = SCpnt->request_bufflen;
 275         unsigned long capac;
 276         struct sdebug_dev_info * devip = NULL;
 277         unsigned char * sbuff;
 278         int inj_recovered = 0;
 279
 280         if (done == NULL)
 281                 return 0;       /* assume mid level reprocessing command */
 282
 283         if (SCpnt->use_sg) { /* just use first element */
 284                 struct scatterlist *sgpnt = (struct scatterlist *)
 285                                                 SCpnt->request_buffer;
 286
 287                 buff = scatg2virt(&sgpnt[0]);
 288                 bufflen = sgpnt[0].length;
 289                 /* READ and WRITE process scatterlist themselves */
 290         }
 291         else
 292                 buff = (unsigned char *) SCpnt->request_buffer;
 293         if (NULL == buff) {
 294                 buff = spare_buff;      /* assume cmd moves no data */
 295                 bufflen = SDEBUG_SENSE_LEN;
 296         }
 297
 298
 299         if(target == sdebug_driver_template.this_id) {
 300                 printk(KERN_INFO "scsi_debug: initiator's id used as "
 301                        "target!\n");
 302                 return schedule_resp(SCpnt, NULL, done,
 303                                      DID_NO_CONNECT << 16, 0);
 304         }
 305
 306         if (SCpnt->device->lun >= scsi_debug_max_luns)
 307                 return schedule_resp(SCpnt, NULL, done,
 308                                      DID_NO_CONNECT << 16, 0);
 309         devip = devInfoReg(SCpnt->device);
 310         if (NULL == devip)
 311                 return schedule_resp(SCpnt, NULL, done,
 312                                      DID_NO_CONNECT << 16, 0);
 313
 314         if ((scsi_debug_every_nth > 0) &&
 315             (++scsi_debug_cmnd_count >= scsi_debug_every_nth)) {
 316                 scsi_debug_cmnd_count =0;
 317                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
 318                         return 0; /* ignore command causing timeout */
 319                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
 320                         inj_recovered = 1; /* to reads and writes below */
 321         }
 322
 323         switch (*cmd) {
 324         case INQUIRY:     /* mandatory */
 325                 errsts = resp_inquiry(cmd, target, buff, bufflen, devip);
 326                 break;
 327         case REQUEST_SENSE:     /* mandatory */
 328                 /* Since this driver indicates autosense by placing the
 329                  * sense buffer in the scsi_cmnd structure in the response
 330                  * (when SAM_STAT_CHECK_CONDITION is set), the mid level
 331                  * shouldn't need to call REQUEST_SENSE */
 332                 if (devip) {
 333                         sbuff = devip->sense_buff;
 334                         memcpy(buff, sbuff, (bufflen < SDEBUG_SENSE_LEN) ?
 335                                              bufflen : SDEBUG_SENSE_LEN);
 336                         mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0, 7);
 337                 } else {
 338                         memset(buff, 0, bufflen);
 339                         buff[0] = 0x70;
 340                 }
 341                 break;
 342         case START_STOP:
 343                 errsts = check_reset(SCpnt, devip);
 344                 break;
 345         case ALLOW_MEDIUM_REMOVAL:
 346                 if ((errsts = check_reset(SCpnt, devip)))
 347                         break;
 348                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 349                         printk("\tMedium removal %s\n",
 350                                cmd[4] ? "inhibited" : "enabled");
 351                 break;
 352         case SEND_DIAGNOSTIC:     /* mandatory */
 353                 memset(buff, 0, bufflen);
 354                 break;
 355         case TEST_UNIT_READY:     /* mandatory */
 356                 memset(buff, 0, bufflen);
 357                 break;
 358         case RESERVE:
 359                 errsts = check_reset(SCpnt, devip);
 360                 memset(buff, 0, bufflen);
 361                 break;
 362         case RESERVE_10:
 363                 errsts = check_reset(SCpnt, devip);
 364                 memset(buff, 0, bufflen);
 365                 break;
 366         case RELEASE:
 367                 errsts = check_reset(SCpnt, devip);
 368                 memset(buff, 0, bufflen);
 369                 break;
 370         case RELEASE_10:
 371                 errsts = check_reset(SCpnt, devip);
 372                 memset(buff, 0, bufflen);
 373                 break;
 374         case READ_CAPACITY:
 375                 errsts = check_reset(SCpnt, devip);
 376                 memset(buff, 0, bufflen);
 377                 if (bufflen > 7) {
 378                         capac = (unsigned long)sdebug_capacity - 1;
 379                         buff[0] = (capac >> 24);
 380                         buff[1] = (capac >> 16) & 0xff;
 381                         buff[2] = (capac >> 8) & 0xff;
 382                         buff[3] = capac & 0xff;
 383                         buff[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
 384                         buff[7] = SECT_SIZE_PER(target) & 0xff;
 385                 }
 386                 break;
 387         case READ_16:
 388         case READ_12:
 389         case READ_10:
 390         case READ_6:
 391                 if ((errsts = check_reset(SCpnt, devip)))
 392                         break;
 393                 upper_blk = 0;
 394                 if ((*cmd) == READ_16) {
 395                         upper_blk = cmd[5] + (cmd[4] << 8) +
 396                                     (cmd[3] << 16) + (cmd[2] << 24);
 397                         block = cmd[9] + (cmd[8] << 8) +
 398                                 (cmd[7] << 16) + (cmd[6] << 24);
 399                         num = cmd[13] + (cmd[12] << 8) +
 400                                 (cmd[11] << 16) + (cmd[10] << 24);
 401                 } else if ((*cmd) == READ_12) {
 402                         block = cmd[5] + (cmd[4] << 8) +
 403                                 (cmd[3] << 16) + (cmd[2] << 24);
 404                         num = cmd[9] + (cmd[8] << 8) +
 405                                 (cmd[7] << 16) + (cmd[6] << 24);
 406                 } else if ((*cmd) == READ_10) {
 407                         block = cmd[5] + (cmd[4] << 8) +
 408                                 (cmd[3] << 16) + (cmd[2] << 24);
 409                         num = cmd[8] + (cmd[7] << 8);
 410                 } else {
 411                         block = cmd[3] + (cmd[2] << 8) +
 412                                 ((cmd[1] & 0x1f) << 16);
 413                         num = cmd[4];
 414                 }
 415                 errsts = resp_read(SCpnt, upper_blk, block, num, devip);
 416                 if (inj_recovered && (0 == errsts)) {
 417                         mk_sense_buffer(devip, RECOVERED_ERROR,
 418                                         THRESHHOLD_EXCEEDED, 0, 18);
 419                         errsts = check_condition_result;
 420                 }
 421                 break;
 422         case REPORT_LUNS:
 423                 errsts = resp_report_luns(cmd, buff, bufflen, devip);
 424                 break;
 425         case WRITE_16:
 426         case WRITE_12:
 427         case WRITE_10:
 428         case WRITE_6:
 429                 if ((errsts = check_reset(SCpnt, devip)))
 430                         break;
 431                 upper_blk = 0;
 432                 if ((*cmd) == WRITE_16) {
 433                         upper_blk = cmd[5] + (cmd[4] << 8) +
 434                                     (cmd[3] << 16) + (cmd[2] << 24);
 435                         block = cmd[9] + (cmd[8] << 8) +
 436                                 (cmd[7] << 16) + (cmd[6] << 24);
 437                         num = cmd[13] + (cmd[12] << 8) +
 438                                 (cmd[11] << 16) + (cmd[10] << 24);
 439                 } else if ((*cmd) == WRITE_12) {
 440                         block = cmd[5] + (cmd[4] << 8) +
 441                                 (cmd[3] << 16) + (cmd[2] << 24);
 442                         num = cmd[9] + (cmd[8] << 8) +
 443                                 (cmd[7] << 16) + (cmd[6] << 24);
 444                 } else if ((*cmd) == WRITE_10) {
 445                         block = cmd[5] + (cmd[4] << 8) +
 446                                 (cmd[3] << 16) + (cmd[2] << 24);
 447                         num = cmd[8] + (cmd[7] << 8);
 448                 } else {
 449                         block = cmd[3] + (cmd[2] << 8) +
 450                                 ((cmd[1] & 0x1f) << 16);
 451                         num = cmd[4];
 452                 }
 453                 errsts = resp_write(SCpnt, upper_blk, block, num, devip);
 454                 if (inj_recovered && (0 == errsts)) {
 455                         mk_sense_buffer(devip, RECOVERED_ERROR,
 456                                         THRESHHOLD_EXCEEDED, 0, 18);
 457                         errsts = check_condition_result;
 458                 }
 459                 break;
 460         case MODE_SENSE:
 461         case MODE_SENSE_10:
 462                 errsts = resp_mode_sense(cmd, target, buff, bufflen, devip);
 463                 break;
 464         case SYNCHRONIZE_CACHE:
 465                 memset(buff, 0, bufflen);
 466                 break;
 467         default:
 468                 if ((errsts = check_reset(SCpnt, devip)))
 469                         break;
 470                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0, 18);
 471                 errsts = check_condition_result;
 472                 break;
 473         }
 474         return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
 475 }
 476
 477 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void *arg)
 478 {
 479         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
 480                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
 481         }
 482         return -EINVAL;
 483         /* return -ENOTTY; // correct return but upsets fdisk */
 484 }
 485
 486 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip)
 487 {
 488         if (devip->reset) {
 489                 devip->reset = 0;
 490                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0, 18);
 491                 return check_condition_result;
 492         }
 493         return 0;
 494 }
 495
 496 #define SDEBUG_LONG_INQ_SZ 58
 497 #define SDEBUG_MAX_INQ_ARR_SZ 128
 498
 499 static const char * vendor_id = "Linux   ";
 500 static const char * product_id = "scsi_debug      ";
 501 static const char * product_rev = "0004";
 502
 503 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
 504                            const char * dev_id_str, int dev_id_str_len)
 505 {
 506         int num;
 507
 508         /* Two identification descriptors: */
 509         /* T10 vendor identifier field format (faked) */
 510         arr[0] = 0x2;   /* ASCII */
 511         arr[1] = 0x1;
 512         arr[2] = 0x0;
 513         memcpy(&arr[4], vendor_id, 8);
 514         memcpy(&arr[12], product_id, 16);
 515         memcpy(&arr[28], dev_id_str, dev_id_str_len);
 516         num = 8 + 16 + dev_id_str_len;
 517         arr[3] = num;
 518         num += 4;
 519         /* NAA IEEE registered identifier (faked) */
 520         arr[num] = 0x1; /* binary */
 521         arr[num + 1] = 0x3;
 522         arr[num + 2] = 0x0;
 523         arr[num + 3] = 0x8;
 524         arr[num + 4] = 0x51;    /* ieee company id=0x123456 (faked) */
 525         arr[num + 5] = 0x23;
 526         arr[num + 6] = 0x45;
 527         arr[num + 7] = 0x60;
 528         arr[num + 8] = (dev_id_num >> 24);
 529         arr[num + 9] = (dev_id_num >> 16) & 0xff;
 530         arr[num + 10] = (dev_id_num >> 8) & 0xff;
 531         arr[num + 11] = dev_id_num & 0xff;
 532         return num + 12;
 533 }
 534
 535 static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
 536                         int bufflen, struct sdebug_dev_info * devip)
 537 {
 538         unsigned char pq_pdt;
 539         unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
 540         int min_len = bufflen > SDEBUG_MAX_INQ_ARR_SZ ?
 541                         SDEBUG_MAX_INQ_ARR_SZ : bufflen;
 542
 543         if (bufflen < cmd[4])
 544                 printk(KERN_INFO "scsi_debug: inquiry: bufflen=%d "
 545                        "< alloc_length=%d\n", bufflen, (int)cmd[4]);
 546         memset(buff, 0, bufflen);
 547         memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
 548         pq_pdt = PERIPH_DEVICE_TYPE(target);
 549         arr[0] = pq_pdt;
 550         if (0x2 & cmd[1]) {  /* CMDDT bit set */
 551                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 552                                 0, 18);
 553                 return check_condition_result;
 554         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
 555                 int dev_id_num, len;
 556                 char dev_id_str[6];
 557
 558                 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
 559                              (devip->target * 1000) + devip->lun;
 560                 len = scnprintf(dev_id_str, 6, "%d", dev_id_num);
 561                 if (0 == cmd[2]) { /* supported vital product data pages */
 562                         arr[3] = 3;
 563                         arr[4] = 0x0; /* this page */
 564                         arr[5] = 0x80; /* unit serial number */
 565                         arr[6] = 0x83; /* device identification */
 566                 } else if (0x80 == cmd[2]) { /* unit serial number */
 567                         arr[1] = 0x80;
 568                         arr[3] = len;
 569                         memcpy(&arr[4], dev_id_str, len);
 570                 } else if (0x83 == cmd[2]) { /* device identification */
 571                         arr[1] = 0x83;
 572                         arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
 573                                                  dev_id_str, len);
 574                 } else {
 575                         /* Illegal request, invalid field in cdb */
 576                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
 577                                         INVALID_FIELD_IN_CDB, 0, 18);
 578                         return check_condition_result;
 579                 }
 580                 memcpy(buff, arr, min_len);
 581                 return 0;
 582         }
 583         /* drops through here for a standard inquiry */
 584         arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;     /* Removable disk */
 585         arr[2] = scsi_debug_scsi_level;
 586         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
 587         arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
 588         memcpy(&arr[8], vendor_id, 8);
 589         memcpy(&arr[16], product_id, 16);
 590         memcpy(&arr[32], product_rev, 4);
 591         memcpy(buff, arr, min_len);
 592         return 0;
 593 }
 594
 595 /* <<Following mode page info copied from ST318451LW>> */
 596
 597 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
 598 {       /* Read-Write Error Recovery page for mode_sense */
 599         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
 600                                         5, 0, 0xff, 0xff};
 601
 602         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
 603         if (1 == pcontrol)
 604                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
 605         return sizeof(err_recov_pg);
 606 }
 607
 608 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
 609 {       /* Disconnect-Reconnect page for mode_sense */
 610         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
 611                                          0, 0, 0, 0, 0, 0, 0, 0};
 612
 613         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
 614         if (1 == pcontrol)
 615                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
 616         return sizeof(disconnect_pg);
 617 }
 618
 619 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
 620 {       /* Format device page for mode_sense */
 621         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
 622                                      0, 0, 0, 0, 0, 0, 0, 0,
 623                                      0, 0, 0, 0, 0x40, 0, 0, 0};
 624
 625         memcpy(p, format_pg, sizeof(format_pg));
 626         p[10] = (sdebug_sectors_per >> 8) & 0xff;
 627         p[11] = sdebug_sectors_per & 0xff;
 628         p[12] = (SECT_SIZE >> 8) & 0xff;
 629         p[13] = SECT_SIZE & 0xff;
 630         if (DEV_REMOVEABLE(target))
 631                 p[20] |= 0x20; /* should agree with INQUIRY */
 632         if (1 == pcontrol)
 633                 memset(p + 2, 0, sizeof(format_pg) - 2);
 634         return sizeof(format_pg);
 635 }
 636
 637 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
 638 {       /* Caching page for mode_sense */
 639         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
 640                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
 641
 642         memcpy(p, caching_pg, sizeof(caching_pg));
 643         if (1 == pcontrol)
 644                 memset(p + 2, 0, sizeof(caching_pg) - 2);
 645         return sizeof(caching_pg);
 646 }
 647
 648 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
 649 {       /* Control mode page for mode_sense */
 650         unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
 651                                      0, 0, 0x2, 0x4b};
 652
 653         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
 654         if (1 == pcontrol)
 655                 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
 656         return sizeof(ctrl_m_pg);
 657 }
 658
 659 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
 660 {       /* Informational Exceptions control mode page for mode_sense */
 661         unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
 662                                     0, 0, 0x0, 0x0};
 663         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
 664         if (1 == pcontrol)
 665                 memset(p + 2, 0, sizeof(iec_m_pg) - 2);
 666         return sizeof(iec_m_pg);
 667 }
 668
 669 #define SDEBUG_MAX_MSENSE_SZ 256
 670
 671 static int resp_mode_sense(unsigned char * cmd, int target,
 672                            unsigned char * buff, int bufflen,
 673                            struct sdebug_dev_info * devip)
 674 {
 675         unsigned char dbd;
 676         int pcontrol, pcode;
 677         unsigned char dev_spec;
 678         int alloc_len, msense_6, offset, len;
 679         unsigned char * ap;
 680         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
 681         int min_len = bufflen > SDEBUG_MAX_MSENSE_SZ ?
 682                         SDEBUG_MAX_MSENSE_SZ : bufflen;
 683
 684         SCSI_LOG_LLQUEUE(3, printk("Mode sense ...(%p %d)\n", buff, bufflen));
 685         dbd = cmd[1] & 0x8;
 686         pcontrol = (cmd[2] & 0xc0) >> 6;
 687         pcode = cmd[2] & 0x3f;
 688         msense_6 = (MODE_SENSE == cmd[0]);
 689         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
 690         /* printk(KERN_INFO "msense: dbd=%d pcontrol=%d pcode=%d "
 691                 "msense_6=%d alloc_len=%d\n", dbd, pcontrol, pcode, "
 692                 "msense_6, alloc_len); */
 693         if (bufflen < alloc_len)
 694                 printk(KERN_INFO "scsi_debug: mode_sense: bufflen=%d "
 695                        "< alloc_length=%d\n", bufflen, alloc_len);
 696         memset(buff, 0, bufflen);
 697         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
 698         if (0x3 == pcontrol) {  /* Saving values not supported */
 699                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
 700                                 0, 18);
 701                 return check_condition_result;
 702         }
 703         dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
 704         if (msense_6) {
 705                 arr[2] = dev_spec;
 706                 offset = 4;
 707         } else {
 708                 arr[3] = dev_spec;
 709                 offset = 8;
 710         }
 711         ap = arr + offset;
 712
 713         switch (pcode) {
 714         case 0x1:       /* Read-Write error recovery page, direct access */
 715                 len = resp_err_recov_pg(ap, pcontrol, target);
 716                 offset += len;
 717                 break;
 718         case 0x2:       /* Disconnect-Reconnect page, all devices */
 719                 len = resp_disconnect_pg(ap, pcontrol, target);
 720                 offset += len;
 721                 break;
 722         case 0x3:       /* Format device page, direct access */
 723                 len = resp_format_pg(ap, pcontrol, target);
 724                 offset += len;
 725                 break;
 726         case 0x8:       /* Caching page, direct access */
 727                 len = resp_caching_pg(ap, pcontrol, target);
 728                 offset += len;
 729                 break;
 730         case 0xa:       /* Control Mode page, all devices */
 731                 len = resp_ctrl_m_pg(ap, pcontrol, target);
 732                 offset += len;
 733                 break;
 734         case 0x1c:      /* Informational Exceptions Mode page, all devices */
 735                 len = resp_iec_m_pg(ap, pcontrol, target);
 736                 offset += len;
 737                 break;
 738         case 0x3f:      /* Read all Mode pages */
 739                 len = resp_err_recov_pg(ap, pcontrol, target);
 740                 len += resp_disconnect_pg(ap + len, pcontrol, target);
 741                 len += resp_format_pg(ap + len, pcontrol, target);
 742                 len += resp_caching_pg(ap + len, pcontrol, target);
 743                 len += resp_ctrl_m_pg(ap + len, pcontrol, target);
 744                 len += resp_iec_m_pg(ap + len, pcontrol, target);
 745                 offset += len;
 746                 break;
 747         default:
 748                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 749                                 0, 18);
 750                 return check_condition_result;
 751         }
 752         if (msense_6)
 753                 arr[0] = offset - 1;
 754         else {
 755                 offset -= 2;
 756                 arr[0] = (offset >> 8) & 0xff;
 757                 arr[1] = offset & 0xff;
 758         }
 759         memcpy(buff, arr, min_len);
 760         return 0;
 761 }
 762
 763 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 764                      int num, struct sdebug_dev_info * devip)
 765 {
 766         unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
 767         int nbytes, sgcount;
 768         struct scatterlist *sgpnt = NULL;
 769         int bufflen = SCpnt->request_bufflen;
 770         unsigned long iflags;
 771
 772         if (upper_blk || (block + num > sdebug_capacity)) {
 773                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 774                                 0, 18);
 775                 return check_condition_result;
 776         }
 777         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
 778             (block <= OPT_MEDIUM_ERR_ADDR) &&
 779             ((block + num) > OPT_MEDIUM_ERR_ADDR)) {
 780                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
 781                                 0, 18);
 782                 /* claim unrecoverable read error */
 783                 return check_condition_result;
 784         }
 785         read_lock_irqsave(&atomic_rw, iflags);
 786         sgcount = 0;
 787         nbytes = bufflen;
 788         /* printk(KERN_INFO "scsi_debug_read: block=%d, tot_bufflen=%d\n",
 789                block, bufflen); */
 790         if (SCpnt->use_sg) {
 791                 sgcount = 0;
 792                 sgpnt = (struct scatterlist *) buff;
 793                 buff = scatg2virt(&sgpnt[sgcount]);
 794                 bufflen = sgpnt[sgcount].length;
 795         }
 796         do {
 797                 memcpy(buff, fake_storep + (block * SECT_SIZE), bufflen);
 798                 nbytes -= bufflen;
 799                 if (SCpnt->use_sg) {
 800                         block += bufflen >> POW2_SECT_SIZE;
 801                         sgcount++;
 802                         if (nbytes) {
 803                                 buff = scatg2virt(&sgpnt[sgcount]);
 804                                 bufflen = sgpnt[sgcount].length;
 805                         }
 806                 } else if (nbytes > 0)
 807                         printk(KERN_WARNING "scsi_debug:resp_read: unexpected "
 808                                "nbytes=%d\n", nbytes);
 809         } while (nbytes);
 810         read_unlock_irqrestore(&atomic_rw, iflags);
 811         return 0;
 812 }
 813
 814 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
 815                       int num, struct sdebug_dev_info * devip)
 816 {
 817         unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
 818         int nbytes, sgcount;
 819         struct scatterlist *sgpnt = NULL;
 820         int bufflen = SCpnt->request_bufflen;
 821         unsigned long iflags;
 822
 823         if (upper_blk || (block + num > sdebug_capacity)) {
 824                 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
 825                                 0, 18);
 826                 return check_condition_result;
 827         }
 828
 829         write_lock_irqsave(&atomic_rw, iflags);
 830         sgcount = 0;
 831         nbytes = bufflen;
 832         if (SCpnt->use_sg) {
 833                 sgcount = 0;
 834                 sgpnt = (struct scatterlist *) buff;
 835                 buff = scatg2virt(&sgpnt[sgcount]);
 836                 bufflen = sgpnt[sgcount].length;
 837         }
 838         do {
 839                 memcpy(fake_storep + (block * SECT_SIZE), buff, bufflen);
 840
 841                 nbytes -= bufflen;
 842                 if (SCpnt->use_sg) {
 843                         block += bufflen >> POW2_SECT_SIZE;
 844                         sgcount++;
 845                         if (nbytes) {
 846                                 buff = scatg2virt(&sgpnt[sgcount]);
 847                                 bufflen = sgpnt[sgcount].length;
 848                         }
 849                 } else if (nbytes > 0)
 850                         printk(KERN_WARNING "scsi_debug:resp_write: "
 851                                "unexpected nbytes=%d\n", nbytes);
 852         } while (nbytes);
 853         write_unlock_irqrestore(&atomic_rw, iflags);
 854         return 0;
 855 }
 856
 857 static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
 858                             int bufflen, struct sdebug_dev_info * devip)
 859 {
 860         unsigned int alloc_len;
 861         int lun_cnt, i, upper;
 862         int select_report = (int)cmd[2];
 863         struct scsi_lun *one_lun;
 864
 865         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
 866         if ((alloc_len < 16) || (select_report > 2)) {
 867                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
 868                                 0, 18);
 869                 return check_condition_result;
 870         }
 871         if (bufflen > 8) { /* can produce response with up to 16k luns
 872                               (lun 0 to lun 16383) */
 873                 memset(buff, 0, bufflen);
 874                 lun_cnt = scsi_debug_max_luns;
 875                 buff[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff;
 876                 buff[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff;
 877                 lun_cnt = min((int)((bufflen - 8) / sizeof(struct scsi_lun)),
 878                               lun_cnt);
 879                 one_lun = (struct scsi_lun *) &buff[8];
 880                 for (i = 0; i < lun_cnt; i++) {
 881                         upper = (i >> 8) & 0x3f;
 882                         if (upper)
 883                                 one_lun[i].scsi_lun[0] =
 884                                     (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
 885                         one_lun[i].scsi_lun[1] = i & 0xff;
 886                 }
 887         }
 888         return 0;
 889 }
 890
 891 /* When timer goes off this function is called. */
 892 static void timer_intr_handler(unsigned long indx)
 893 {
 894         struct sdebug_queued_cmd * sqcp;
 895         unsigned long iflags;
 896
 897         if (indx >= SCSI_DEBUG_CANQUEUE) {
 898                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
 899                        "large\n");
 900                 return;
 901         }
 902         spin_lock_irqsave(&queued_arr_lock, iflags);
 903         sqcp = &queued_arr[(int)indx];
 904         if (! sqcp->in_use) {
 905                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
 906                        "interrupt\n");
 907                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
 908                 return;
 909         }
 910         sqcp->in_use = 0;
 911         if (sqcp->done_funct) {
 912                 sqcp->a_cmnd->result = sqcp->scsi_result;
 913                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
 914         }
 915         sqcp->done_funct = NULL;
 916         spin_unlock_irqrestore(&queued_arr_lock, iflags);
 917 }
 918
 919 static int scsi_debug_slave_alloc(struct scsi_device * sdp)
 920 {
 921         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 922                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
 923                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 924         return 0;
 925 }
 926
 927 static int scsi_debug_slave_configure(struct scsi_device * sdp)
 928 {
 929         struct sdebug_dev_info * devip;
 930
 931         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 932                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
 933                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 934         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
 935                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
 936         devip = devInfoReg(sdp);
 937         sdp->hostdata = devip;
 938         if (sdp->host->cmd_per_lun)
 939                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
 940                                         sdp->host->cmd_per_lun);
 941         return 0;
 942 }
 943
 944 static void scsi_debug_slave_destroy(struct scsi_device * sdp)
 945 {
 946         struct sdebug_dev_info * devip =
 947                                 (struct sdebug_dev_info *)sdp->hostdata;
 948
 949         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
 950                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
 951                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
 952         if (devip) {
 953                 /* make this slot avaliable for re-use */
 954                 devip->used = 0;
 955                 sdp->hostdata = NULL;
 956         }
 957 }
 958
 959 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
 960 {
 961         struct sdebug_host_info * sdbg_host;
 962         struct sdebug_dev_info * open_devip = NULL;
 963         struct sdebug_dev_info * devip =
 964                         (struct sdebug_dev_info *)sdev->hostdata;
 965
 966         if (devip)
 967                 return devip;
 968         sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
 969         if(! sdbg_host) {
 970                 printk(KERN_ERR "Host info NULL\n");
 971                 return NULL;
 972         }
 973         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
 974                 if ((devip->used) && (devip->channel == sdev->channel) &&
 975                     (devip->target == sdev->id) &&
 976                     (devip->lun == sdev->lun))
 977                         return devip;
 978                 else {
 979                         if ((!devip->used) && (!open_devip))
 980                                 open_devip = devip;
 981                 }
 982         }
 983         if (open_devip) {
 984                 open_devip->channel = sdev->channel;
 985                 open_devip->target = sdev->id;
 986                 open_devip->lun = sdev->lun;
 987                 open_devip->sdbg_host = sdbg_host;
 988                 open_devip->reset = 1;
 989                 open_devip->used = 1;
 990                 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
 991                 open_devip->sense_buff[0] = 0x70;
 992                 return open_devip;
 993         }
 994         return NULL;
 995 }
 996
 997 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
 998                             int asc, int asq, int inbandLen)
 999 {
1000         unsigned char * sbuff;
1001
1002         sbuff = devip->sense_buff;
1003         memset(sbuff, 0, SDEBUG_SENSE_LEN);
1004         if (inbandLen > SDEBUG_SENSE_LEN)
1005                 inbandLen = SDEBUG_SENSE_LEN;
1006         sbuff[0] = 0x70;
1007         sbuff[2] = key;
1008         sbuff[7] = (inbandLen > 7) ? (inbandLen - 8) : 0;
1009         sbuff[12] = asc;
1010         sbuff[13] = asq;
1011 }
1012
1013 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
1014 {
1015         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1016                 printk(KERN_INFO "scsi_debug: abort\n");
1017         ++num_aborts;
1018         stop_queued_cmnd(SCpnt);
1019         return SUCCESS;
1020 }
1021
1022 static int scsi_debug_biosparam(struct scsi_device *sdev,
1023                 struct block_device * bdev, sector_t capacity, int *info)
1024 {
1025         int res;
1026         unsigned char *buf;
1027
1028         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1029                 printk(KERN_INFO "scsi_debug: biosparam\n");
1030         buf = scsi_bios_ptable(bdev);
1031         if (buf) {
1032                 res = scsi_partsize(buf, capacity,
1033                                     &info[2], &info[0], &info[1]);
1034                 kfree(buf);
1035                 if (! res)
1036                         return res;
1037         }
1038         info[0] = sdebug_heads;
1039         info[1] = sdebug_sectors_per;
1040         info[2] = sdebug_cylinders_per;
1041         return 0;
1042 }
1043
1044 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
1045 {
1046         struct sdebug_dev_info * devip;
1047
1048         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1049                 printk(KERN_INFO "scsi_debug: device_reset\n");
1050         ++num_dev_resets;
1051         if (SCpnt) {
1052                 devip = devInfoReg(SCpnt->device);
1053                 if (devip)
1054                         devip->reset = 1;
1055         }
1056         return SUCCESS;
1057 }
1058
1059 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
1060 {
1061         struct sdebug_host_info *sdbg_host;
1062         struct sdebug_dev_info * dev_info;
1063         struct scsi_device * sdp;
1064         struct Scsi_Host * hp;
1065
1066         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1067                 printk(KERN_INFO "scsi_debug: bus_reset\n");
1068         ++num_bus_resets;
1069         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
1070                 sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
1071                 if (sdbg_host) {
1072                         list_for_each_entry(dev_info,
1073                                             &sdbg_host->dev_info_list,
1074                                             dev_list)
1075                                 dev_info->reset = 1;
1076                 }
1077         }
1078         return SUCCESS;
1079 }
1080
1081 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
1082 {
1083         struct sdebug_host_info * sdbg_host;
1084         struct sdebug_dev_info * dev_info;
1085
1086         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1087                 printk(KERN_INFO "scsi_debug: host_reset\n");
1088         ++num_host_resets;
1089         spin_lock(&sdebug_host_list_lock);
1090         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1091                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
1092                                     dev_list)
1093                         dev_info->reset = 1;
1094         }
1095         spin_unlock(&sdebug_host_list_lock);
1096         stop_all_queued();
1097         return SUCCESS;
1098 }
1099
1100 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
1101 static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
1102 {
1103         unsigned long iflags;
1104         int k;
1105         struct sdebug_queued_cmd * sqcp;
1106
1107         spin_lock_irqsave(&queued_arr_lock, iflags);
1108         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1109                 sqcp = &queued_arr[k];
1110                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
1111                         del_timer_sync(&sqcp->cmnd_timer);
1112                         sqcp->in_use = 0;
1113                         sqcp->a_cmnd = NULL;
1114                         break;
1115                 }
1116         }
1117         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1118         return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
1119 }
1120
1121 /* Deletes (stops) timers of all queued commands */
1122 static void stop_all_queued(void)
1123 {
1124         unsigned long iflags;
1125         int k;
1126         struct sdebug_queued_cmd * sqcp;
1127
1128         spin_lock_irqsave(&queued_arr_lock, iflags);
1129         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1130                 sqcp = &queued_arr[k];
1131                 if (sqcp->in_use && sqcp->a_cmnd) {
1132                         del_timer_sync(&sqcp->cmnd_timer);
1133                         sqcp->in_use = 0;
1134                         sqcp->a_cmnd = NULL;
1135                 }
1136         }
1137         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1138 }
1139
1140 /* Initializes timers in queued array */
1141 static void init_all_queued(void)
1142 {
1143         unsigned long iflags;
1144         int k;
1145         struct sdebug_queued_cmd * sqcp;
1146
1147         spin_lock_irqsave(&queued_arr_lock, iflags);
1148         for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1149                 sqcp = &queued_arr[k];
1150                 init_timer(&sqcp->cmnd_timer);
1151                 sqcp->in_use = 0;
1152                 sqcp->a_cmnd = NULL;
1153         }
1154         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1155 }
1156
1157 static int schedule_resp(struct scsi_cmnd * cmnd,
1158                          struct sdebug_dev_info * devip,
1159                          done_funct_t done, int scsi_result, int delta_jiff)
1160 {
1161         int k, num;
1162
1163         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
1164                 printk(KERN_INFO "scsi_debug: cmd ");
1165                 for (k = 0, num = cmnd->cmd_len; k < num; ++k)
1166                         printk("%02x ", (int)cmnd->cmnd[k]);
1167                 printk("\n");
1168                 if (scsi_result) {
1169                         struct scsi_device * sdp = cmnd->device;
1170
1171                         printk(KERN_INFO "scsi_debug: ... <%u %u %u %u> "
1172                                "non-zero result=0x%x\n", sdp->host->host_no,
1173                                sdp->channel, sdp->id, sdp->lun, scsi_result);
1174                 }
1175         }
1176         if (cmnd && devip) {
1177                 /* simulate autosense by this driver */
1178                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
1179                         memcpy(cmnd->sense_buffer, devip->sense_buff,
1180                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
1181                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
1182         }
1183         if (delta_jiff <= 0) {
1184                 if (cmnd)
1185                         cmnd->result = scsi_result;
1186                 if (done)
1187                         done(cmnd);
1188                 return 0;
1189         } else {
1190                 unsigned long iflags;
1191                 int k;
1192                 struct sdebug_queued_cmd * sqcp = NULL;
1193
1194                 spin_lock_irqsave(&queued_arr_lock, iflags);
1195                 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1196                         sqcp = &queued_arr[k];
1197                         if (! sqcp->in_use)
1198                                 break;
1199                 }
1200                 if (k >= SCSI_DEBUG_CANQUEUE) {
1201                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
1202                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
1203                         return 1;       /* report busy to mid level */
1204                 }
1205                 sqcp->in_use = 1;
1206                 sqcp->a_cmnd = cmnd;
1207                 sqcp->scsi_result = scsi_result;
1208                 sqcp->done_funct = done;
1209                 sqcp->cmnd_timer.function = timer_intr_handler;
1210                 sqcp->cmnd_timer.data = k;
1211                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
1212                 add_timer(&sqcp->cmnd_timer);
1213                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1214                 if (cmnd)
1215                         cmnd->result = 0;
1216                 return 0;
1217         }
1218 }
1219
1220 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1221  * of sysfs parameters (which module_param doesn't yet support).
1222  * Sysfs parameters defined explicitly below.
1223  */
1224 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
1225 module_param_named(max_luns, scsi_debug_max_luns, int, 0);
1226 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);
1227 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
1228 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
1229 module_param_named(every_nth, scsi_debug_every_nth, int, 0);
1230 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
1231 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
1232
1233 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
1234 MODULE_DESCRIPTION("SCSI debug adapter driver");
1235 MODULE_LICENSE("GPL");
1236
1237 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
1238 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
1239 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate");
1240 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
1241 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
1242 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
1243 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
1244 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
1245
1246
1247 static char sdebug_info[256];
1248
1249 static const char * scsi_debug_info(struct Scsi_Host * shp)
1250 {
1251         sprintf(sdebug_info, "scsi_debug, %s, num_tgts=%d, "
1252                 "dev_size_mb=%d, opts=0x%x", scsi_debug_version_str,
1253                 scsi_debug_num_tgts, scsi_debug_dev_size_mb,
1254                 scsi_debug_opts);
1255         return sdebug_info;
1256 }
1257
1258 /* scsi_debug_proc_info
1259  * Used if the driver currently has no own support for /proc/scsi
1260  */
1261 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
1262                                 int length, int inout)
1263 {
1264         int len, pos, begin;
1265         int orig_length;
1266
1267         orig_length = length;
1268
1269         if (inout == 1) {
1270                 char arr[16];
1271                 int minLen = length > 15 ? 15 : length;
1272
1273                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1274                         return -EACCES;
1275                 memcpy(arr, buffer, minLen);
1276                 arr[minLen] = '\0';
1277                 if (1 != sscanf(arr, "%d", &pos))
1278                         return -EINVAL;
1279                 scsi_debug_opts = pos;
1280                 if (scsi_debug_every_nth > 0)
1281                         scsi_debug_cmnd_count = 0;
1282                 return length;
1283         }
1284         begin = 0;
1285         pos = len = sprintf(buffer, "scsi_debug adapter driver, %s\n"
1286             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
1287             "every_nth=%d(curr:%d)\n"
1288             "delay=%d, max_luns=%d, scsi_level=%d\n"
1289             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
1290             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
1291             "host_resets=%d\n",
1292             scsi_debug_version_str, scsi_debug_num_tgts,
1293             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
1294             scsi_debug_cmnd_count, scsi_debug_delay,
1295             scsi_debug_max_luns, scsi_debug_scsi_level,
1296             SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
1297             num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
1298         if (pos < offset) {
1299                 len = 0;
1300                 begin = pos;
1301         }
1302         *start = buffer + (offset - begin);     /* Start of wanted data */
1303         len -= (offset - begin);
1304         if (len > length)
1305                 len = length;
1306         return len;
1307 }
1308
1309 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
1310 {
1311         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
1312 }
1313
1314 static ssize_t sdebug_delay_store(struct device_driver * ddp,
1315                                   const char * buf, size_t count)
1316 {
1317         int delay;
1318         char work[20];
1319
1320         if (1 == sscanf(buf, "%10s", work)) {
1321                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
1322                         scsi_debug_delay = delay;
1323                         return count;
1324                 }
1325         }
1326         return -EINVAL;
1327 }
1328 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
1329             sdebug_delay_store)
1330
1331 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
1332 {
1333         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
1334 }
1335
1336 static ssize_t sdebug_opts_store(struct device_driver * ddp,
1337                                  const char * buf, size_t count)
1338 {
1339         int opts;
1340         char work[20];
1341
1342         if (1 == sscanf(buf, "%10s", work)) {
1343                 if (0 == strnicmp(work,"0x", 2)) {
1344                         if (1 == sscanf(&work[2], "%x", &opts))
1345                                 goto opts_done;
1346                 } else {
1347                         if (1 == sscanf(work, "%d", &opts))
1348                                 goto opts_done;
1349                 }
1350         }
1351         return -EINVAL;
1352 opts_done:
1353         scsi_debug_opts = opts;
1354         scsi_debug_cmnd_count = 0;
1355         return count;
1356 }
1357 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
1358             sdebug_opts_store)
1359
1360 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
1361 {
1362         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
1363 }
1364 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
1365                                      const char * buf, size_t count)
1366 {
1367         int n;
1368
1369         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1370                 scsi_debug_num_tgts = n;
1371                 return count;
1372         }
1373         return -EINVAL;
1374 }
1375 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
1376             sdebug_num_tgts_store)
1377
1378 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
1379 {
1380         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
1381 }
1382 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL)
1383
1384 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
1385 {
1386         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
1387 }
1388 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
1389                                       const char * buf, size_t count)
1390 {
1391         int nth;
1392
1393         if ((count > 0) && (1 == sscanf(buf, "%d", &nth)) && (nth >= 0)) {
1394                 scsi_debug_every_nth = nth;
1395                 scsi_debug_cmnd_count = 0;
1396                 return count;
1397         }
1398         return -EINVAL;
1399 }
1400 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
1401             sdebug_every_nth_store)
1402
1403 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
1404 {
1405         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
1406 }
1407 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
1408                                      const char * buf, size_t count)
1409 {
1410         int n;
1411
1412         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1413                 scsi_debug_max_luns = n;
1414                 return count;
1415         }
1416         return -EINVAL;
1417 }
1418 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
1419             sdebug_max_luns_store)
1420
1421 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
1422 {
1423         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
1424 }
1425 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL)
1426
1427 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
1428 {
1429         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
1430 }
1431
1432 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
1433                                      const char * buf, size_t count)
1434 {
1435         int delta_hosts;
1436         char work[20];
1437
1438         if (1 != sscanf(buf, "%10s", work))
1439                 return -EINVAL;
1440         {       /* temporary hack around sscanf() problem with -ve nums */
1441                 int neg = 0;
1442
1443                 if ('-' == *work)
1444                         neg = 1;
1445                 if (1 != sscanf(work + neg, "%d", &delta_hosts))
1446                         return -EINVAL;
1447                 if (neg)
1448                         delta_hosts = -delta_hosts;
1449         }
1450         if (delta_hosts > 0) {
1451                 do {
1452                         sdebug_add_adapter();
1453                 } while (--delta_hosts);
1454         } else if (delta_hosts < 0) {
1455                 do {
1456                         sdebug_remove_adapter();
1457                 } while (++delta_hosts);
1458         }
1459         return count;
1460 }
1461 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
1462             sdebug_add_host_store)
1463
1464 static void do_create_driverfs_files(void)
1465 {
1466         driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
1467         driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
1468         driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1469         driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1470         driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1471         driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1472         driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1473         driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1474 }
1475
1476 static void do_remove_driverfs_files(void)
1477 {
1478         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1479         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1480         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1481         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1482         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1483         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1484         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
1485         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
1486 }
1487
1488 static int __init scsi_debug_init(void)
1489 {
1490         unsigned long sz;
1491         int host_to_add;
1492         int k;
1493
1494         sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576;
1495         sdebug_capacity = sdebug_store_size / SECT_SIZE;
1496
1497         /* play around with geometry, don't waste too much on track 0 */
1498         sdebug_heads = 8;
1499         sdebug_sectors_per = 32;
1500         if (scsi_debug_dev_size_mb >= 16)
1501                 sdebug_heads = 32;
1502         else if (scsi_debug_dev_size_mb >= 256)
1503                 sdebug_heads = 64;
1504         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1505                                (sdebug_sectors_per * sdebug_heads);
1506         if (sdebug_cylinders_per >= 1024) {
1507                 /* other LLDs do this; implies >= 1GB ram disk ... */
1508                 sdebug_heads = 255;
1509                 sdebug_sectors_per = 63;
1510                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1511                                (sdebug_sectors_per * sdebug_heads);
1512         }
1513
1514         sz = sdebug_store_size;
1515         fake_storep = vmalloc(sz);
1516         if (NULL == fake_storep) {
1517                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
1518                 return -ENOMEM;
1519         }
1520         memset(fake_storep, 0, sz);
1521
1522         init_all_queued();
1523
1524         device_register(&pseudo_primary);
1525         bus_register(&pseudo_lld_bus);
1526         driver_register(&sdebug_driverfs_driver);
1527         do_create_driverfs_files();
1528
1529         sdebug_driver_template.proc_name = (char *)sdebug_proc_name;
1530
1531         host_to_add = scsi_debug_add_host;
1532         scsi_debug_add_host = 0;
1533
1534         for (k = 0; k < host_to_add; k++) {
1535                 if (sdebug_add_adapter()) {
1536                         printk(KERN_ERR "scsi_debug_init: "
1537                                "sdebug_add_adapter failed k=%d\n", k);
1538                         break;
1539                 }
1540         }
1541
1542         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
1543                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
1544                        scsi_debug_add_host);
1545         }
1546         return 0;
1547 }
1548
1549 static void __exit scsi_debug_exit(void)
1550 {
1551         int k = scsi_debug_add_host;
1552
1553         stop_all_queued();
1554         for (; k; k--)
1555                 sdebug_remove_adapter();
1556         do_remove_driverfs_files();
1557         driver_unregister(&sdebug_driverfs_driver);
1558         bus_unregister(&pseudo_lld_bus);
1559         device_unregister(&pseudo_primary);
1560
1561         vfree(fake_storep);
1562 }
1563
1564 device_initcall(scsi_debug_init);
1565 module_exit(scsi_debug_exit);
1566
1567 void pseudo_0_release(struct device * dev)
1568 {
1569         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1570                 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
1571 }
1572
1573 static struct device pseudo_primary = {
1574         .bus_id         = "pseudo_0",
1575         .release        = pseudo_0_release,
1576 };
1577
1578 static int pseudo_lld_bus_match(struct device *dev,
1579                           struct device_driver *dev_driver)
1580 {
1581         return 1;
1582 }
1583
1584 static struct bus_type pseudo_lld_bus = {
1585         .name = "pseudo",
1586         .match = pseudo_lld_bus_match,
1587 };
1588
1589 static void sdebug_release_adapter(struct device * dev)
1590 {
1591         struct sdebug_host_info *sdbg_host;
1592
1593         sdbg_host = to_sdebug_host(dev);
1594         kfree(sdbg_host);
1595 }
1596
1597 static int sdebug_add_adapter(void)
1598 {
1599         int k, devs_per_host;
1600         int error = 0;
1601         struct sdebug_host_info *sdbg_host;
1602         struct sdebug_dev_info *sdbg_devinfo;
1603         struct list_head *lh, *lh_sf;
1604
1605         sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL);
1606
1607         if (NULL == sdbg_host) {
1608                 printk(KERN_ERR "%s: out of memory at line %d\n",
1609                        __FUNCTION__, __LINE__);
1610                 return -ENOMEM;
1611         }
1612
1613         memset(sdbg_host, 0, sizeof(*sdbg_host));
1614         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
1615
1616         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
1617         for (k = 0; k < devs_per_host; k++) {
1618                 sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL);
1619                 if (NULL == sdbg_devinfo) {
1620                         printk(KERN_ERR "%s: out of memory at line %d\n",
1621                                __FUNCTION__, __LINE__);
1622                         error = -ENOMEM;
1623                         goto clean;
1624                 }
1625                 memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo));
1626                 sdbg_devinfo->sdbg_host = sdbg_host;
1627                 list_add_tail(&sdbg_devinfo->dev_list,
1628                               &sdbg_host->dev_info_list);
1629         }
1630
1631         spin_lock(&sdebug_host_list_lock);
1632         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
1633         spin_unlock(&sdebug_host_list_lock);
1634
1635         sdbg_host->dev.bus = &pseudo_lld_bus;
1636         sdbg_host->dev.parent = &pseudo_primary;
1637         sdbg_host->dev.release = &sdebug_release_adapter;
1638         sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
1639
1640         error = device_register(&sdbg_host->dev);
1641
1642         if (error)
1643                 goto clean;
1644
1645         ++scsi_debug_add_host;
1646         return error;
1647
1648 clean:
1649         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1650                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1651                                           dev_list);
1652                 list_del(&sdbg_devinfo->dev_list);
1653                 kfree(sdbg_devinfo);
1654         }
1655
1656         kfree(sdbg_host);
1657         return error;
1658 }
1659
1660 static void sdebug_remove_adapter(void)
1661 {
1662         struct sdebug_host_info * sdbg_host = NULL;
1663
1664         spin_lock(&sdebug_host_list_lock);
1665         if (!list_empty(&sdebug_host_list)) {
1666                 sdbg_host = list_entry(sdebug_host_list.prev,
1667                                        struct sdebug_host_info, host_list);
1668                 list_del(&sdbg_host->host_list);
1669         }
1670         spin_unlock(&sdebug_host_list_lock);
1671
1672         if (!sdbg_host)
1673                 return;
1674
1675         device_unregister(&sdbg_host->dev);
1676         --scsi_debug_add_host;
1677 }
1678
1679 static int sdebug_driver_probe(struct device * dev)
1680 {
1681         int error = 0;
1682         struct sdebug_host_info *sdbg_host;
1683         struct Scsi_Host *hpnt;
1684
1685         sdbg_host = to_sdebug_host(dev);
1686
1687         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
1688         if (NULL == hpnt) {
1689                 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
1690                 error = -ENODEV;
1691                 return error;
1692         }
1693
1694         sdbg_host->shost = hpnt;
1695         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
1696         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
1697                 hpnt->max_id = scsi_debug_num_tgts + 1;
1698         else
1699                 hpnt->max_id = scsi_debug_num_tgts;
1700         hpnt->max_lun = scsi_debug_max_luns;
1701
1702         error = scsi_add_host(hpnt, &sdbg_host->dev);
1703         if (error) {
1704                 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
1705                 error = -ENODEV;
1706                 scsi_host_put(hpnt);
1707         } else
1708                 scsi_scan_host(hpnt);
1709
1710
1711         return error;
1712 }
1713
1714 static int sdebug_driver_remove(struct device * dev)
1715 {
1716         struct list_head *lh, *lh_sf;
1717         struct sdebug_host_info *sdbg_host;
1718         struct sdebug_dev_info *sdbg_devinfo;
1719
1720         sdbg_host = to_sdebug_host(dev);
1721
1722         if (!sdbg_host) {
1723                 printk(KERN_ERR "%s: Unable to locate host info\n",
1724                        __FUNCTION__);
1725                 return -ENODEV;
1726         }
1727
1728         scsi_remove_host(sdbg_host->shost);
1729
1730         list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1731                 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1732                                           dev_list);
1733                 list_del(&sdbg_devinfo->dev_list);
1734                 kfree(sdbg_devinfo);
1735         }
1736
1737         scsi_host_put(sdbg_host->shost);
1738         return 0;
1739 }