1 /* 2 * linux/kernel/scsi_debug.c 3 * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv 4 * Copyright (C) 1992 Eric Youngdale 5 * Simulate a host adapter with 2 disks attached. Do a lot of checking 6 * to make sure that we are not getting blocks mixed up, and PANIC if 7 * anything out of the ordinary is seen. 8 * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 9 * 10 * This version is more generic, simulating a variable number of disk 11 * (or disk like devices) sharing a common amount of RAM 12 * 13 * 14 * For documentation see http://www.torque.net/sg/sdebug26.html 15 * 16 * D. Gilbert (dpg) work for Magneto-Optical device test [20010421] 17 * dpg: work for devfs large number of disks [20010809] 18 * forked for lk 2.5 series [20011216, 20020101] 19 * use vmalloc() more inquiry+mode_sense [20020302] 20 * add timers for delayed responses [20020721] 21 * Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031] 22 * Mike Anderson <andmike@us.ibm.com> sysfs work [20021118] 23 * dpg: change style of boot options to "scsi_debug.num_tgts=2" and 24 * module options to "modprobe scsi_debug num_tgts=2" [20021221] 25 */ 26 27 #include <linux/config.h> 28 #include <linux/module.h> 29 30 #include <linux/kernel.h> 31 #include <linux/sched.h> 32 #include <linux/errno.h> 33 #include <linux/timer.h> 34 #include <linux/types.h> 35 #include <linux/string.h> 36 #include <linux/genhd.h> 37 #include <linux/fs.h> 38 #include <linux/init.h> 39 #include <linux/proc_fs.h> 40 #include <linux/smp_lock.h> 41 #include <linux/vmalloc.h> 42 #include <linux/moduleparam.h> 43 44 #include <linux/blkdev.h> 45 #include "scsi.h" 46 #include <scsi/scsi_host.h> 47 #include <scsi/scsicam.h> 48 49 #include <linux/stat.h> 50 51 #include "scsi_logging.h" 52 #include "scsi_debug.h" 53 54 #define SCSI_DEBUG_VERSION "1.75" 55 static const char * scsi_debug_version_date = "20050113"; 56 57 /* Additional Sense Code (ASC) used */ 58 #define NO_ADDED_SENSE 0x0 59 #define UNRECOVERED_READ_ERR 0x11 60 #define INVALID_OPCODE 0x20 61 #define ADDR_OUT_OF_RANGE 0x21 62 #define INVALID_FIELD_IN_CDB 0x24 63 #define POWERON_RESET 0x29 64 #define SAVING_PARAMS_UNSUP 0x39 65 #define THRESHHOLD_EXCEEDED 0x5d 66 67 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */ 68 69 /* Default values for driver parameters */ 70 #define DEF_NUM_HOST 1 71 #define DEF_NUM_TGTS 1 72 #define DEF_MAX_LUNS 1 73 /* With these defaults, this driver will make 1 host with 1 target 74 * (id 0) containing 1 logical unit (lun 0). That is 1 device. 75 */ 76 #define DEF_DELAY 1 77 #define DEF_DEV_SIZE_MB 8 78 #define DEF_EVERY_NTH 0 79 #define DEF_NUM_PARTS 0 80 #define DEF_OPTS 0 81 #define DEF_SCSI_LEVEL 5 /* INQUIRY, byte2 [5->SPC-3] */ 82 #define DEF_PTYPE 0 83 #define DEF_D_SENSE 0 84 85 /* bit mask values for scsi_debug_opts */ 86 #define SCSI_DEBUG_OPT_NOISE 1 87 #define SCSI_DEBUG_OPT_MEDIUM_ERR 2 88 #define SCSI_DEBUG_OPT_TIMEOUT 4 89 #define SCSI_DEBUG_OPT_RECOVERED_ERR 8 90 /* When "every_nth" > 0 then modulo "every_nth" commands: 91 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set 92 * - a RECOVERED_ERROR is simulated on successful read and write 93 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. 94 * 95 * When "every_nth" < 0 then after "- every_nth" commands: 96 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set 97 * - a RECOVERED_ERROR is simulated on successful read and write 98 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. 99 * This will continue until some other action occurs (e.g. the user 100 * writing a new value (other than -1 or 1) to every_nth via sysfs). 101 */ 102 103 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this 104 * sector on read commands: */ 105 #define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ 106 107 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) 108 * or "peripheral device" addressing (value 0) */ 109 #define SAM2_LUN_ADDRESS_METHOD 0 110 111 static int scsi_debug_add_host = DEF_NUM_HOST; 112 static int scsi_debug_delay = DEF_DELAY; 113 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB; 114 static int scsi_debug_every_nth = DEF_EVERY_NTH; 115 static int scsi_debug_max_luns = DEF_MAX_LUNS; 116 static int scsi_debug_num_parts = DEF_NUM_PARTS; 117 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */ 118 static int scsi_debug_opts = DEF_OPTS; 119 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL; 120 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */ 121 static int scsi_debug_dsense = DEF_D_SENSE; 122 123 static int scsi_debug_cmnd_count = 0; 124 125 #define DEV_READONLY(TGT) (0) 126 #define DEV_REMOVEABLE(TGT) (0) 127 128 static unsigned long sdebug_store_size; /* in bytes */ 129 static sector_t sdebug_capacity; /* in sectors */ 130 131 /* old BIOS stuff, kernel may get rid of them but some mode sense pages 132 may still need them */ 133 static int sdebug_heads; /* heads per disk */ 134 static int sdebug_cylinders_per; /* cylinders per surface */ 135 static int sdebug_sectors_per; /* sectors per cylinder */ 136 137 /* default sector size is 512 bytes, 2**9 bytes */ 138 #define POW2_SECT_SIZE 9 139 #define SECT_SIZE (1 << POW2_SECT_SIZE) 140 #define SECT_SIZE_PER(TGT) SECT_SIZE 141 142 #define SDEBUG_MAX_PARTS 4 143 144 #define SDEBUG_SENSE_LEN 32 145 146 struct sdebug_dev_info { 147 struct list_head dev_list; 148 unsigned char sense_buff[SDEBUG_SENSE_LEN]; /* weak nexus */ 149 unsigned int channel; 150 unsigned int target; 151 unsigned int lun; 152 struct sdebug_host_info *sdbg_host; 153 char reset; 154 char used; 155 }; 156 157 struct sdebug_host_info { 158 struct list_head host_list; 159 struct Scsi_Host *shost; 160 struct device dev; 161 struct list_head dev_info_list; 162 }; 163 164 #define to_sdebug_host(d) \ 165 container_of(d, struct sdebug_host_info, dev) 166 167 static LIST_HEAD(sdebug_host_list); 168 static DEFINE_SPINLOCK(sdebug_host_list_lock); 169 170 typedef void (* done_funct_t) (struct scsi_cmnd *); 171 172 struct sdebug_queued_cmd { 173 int in_use; 174 struct timer_list cmnd_timer; 175 done_funct_t done_funct; 176 struct scsi_cmnd * a_cmnd; 177 int scsi_result; 178 }; 179 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE]; 180 181 static struct scsi_host_template sdebug_driver_template = { 182 .proc_info = scsi_debug_proc_info, 183 .name = "SCSI DEBUG", 184 .info = scsi_debug_info, 185 .slave_alloc = scsi_debug_slave_alloc, 186 .slave_configure = scsi_debug_slave_configure, 187 .slave_destroy = scsi_debug_slave_destroy, 188 .ioctl = scsi_debug_ioctl, 189 .queuecommand = scsi_debug_queuecommand, 190 .eh_abort_handler = scsi_debug_abort, 191 .eh_bus_reset_handler = scsi_debug_bus_reset, 192 .eh_device_reset_handler = scsi_debug_device_reset, 193 .eh_host_reset_handler = scsi_debug_host_reset, 194 .bios_param = scsi_debug_biosparam, 195 .can_queue = SCSI_DEBUG_CANQUEUE, 196 .this_id = 7, 197 .sg_tablesize = 64, 198 .cmd_per_lun = 3, 199 .max_sectors = 4096, 200 .unchecked_isa_dma = 0, 201 .use_clustering = DISABLE_CLUSTERING, 202 .module = THIS_MODULE, 203 }; 204 205 static unsigned char * fake_storep; /* ramdisk storage */ 206 207 static int num_aborts = 0; 208 static int num_dev_resets = 0; 209 static int num_bus_resets = 0; 210 static int num_host_resets = 0; 211 212 static DEFINE_SPINLOCK(queued_arr_lock); 213 static DEFINE_RWLOCK(atomic_rw); 214 215 static char sdebug_proc_name[] = "scsi_debug"; 216 217 static int sdebug_driver_probe(struct device *); 218 static int sdebug_driver_remove(struct device *); 219 static struct bus_type pseudo_lld_bus; 220 221 static struct device_driver sdebug_driverfs_driver = { 222 .name = sdebug_proc_name, 223 .bus = &pseudo_lld_bus, 224 .probe = sdebug_driver_probe, 225 .remove = sdebug_driver_remove, 226 }; 227 228 static const int check_condition_result = 229 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 230 231 /* function declarations */ 232 static int resp_inquiry(struct scsi_cmnd * SCpnt, int target, 233 struct sdebug_dev_info * devip); 234 static int resp_requests(struct scsi_cmnd * SCpnt, 235 struct sdebug_dev_info * devip); 236 static int resp_readcap(struct scsi_cmnd * SCpnt, 237 struct sdebug_dev_info * devip); 238 static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target, 239 struct sdebug_dev_info * devip); 240 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, 241 int num, struct sdebug_dev_info * devip); 242 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, 243 int num, struct sdebug_dev_info * devip); 244 static int resp_report_luns(struct scsi_cmnd * SCpnt, 245 struct sdebug_dev_info * devip); 246 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 247 int arr_len); 248 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 249 int max_arr_len); 250 static void timer_intr_handler(unsigned long); 251 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev); 252 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, 253 int asc, int asq); 254 static int check_reset(struct scsi_cmnd * SCpnt, 255 struct sdebug_dev_info * devip); 256 static int schedule_resp(struct scsi_cmnd * cmnd, 257 struct sdebug_dev_info * devip, 258 done_funct_t done, int scsi_result, int delta_jiff); 259 static void __init sdebug_build_parts(unsigned char * ramp); 260 static void __init init_all_queued(void); 261 static void stop_all_queued(void); 262 static int stop_queued_cmnd(struct scsi_cmnd * cmnd); 263 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, 264 const char * dev_id_str, int dev_id_str_len); 265 static void do_create_driverfs_files(void); 266 static void do_remove_driverfs_files(void); 267 268 static int sdebug_add_adapter(void); 269 static void sdebug_remove_adapter(void); 270 static void sdebug_max_tgts_luns(void); 271 272 static struct device pseudo_primary; 273 static struct bus_type pseudo_lld_bus; 274 275 276 static 277 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done) 278 { 279 unsigned char *cmd = (unsigned char *) SCpnt->cmnd; 280 int block, upper_blk, num, k; 281 int errsts = 0; 282 int target = scmd_id(SCpnt); 283 struct sdebug_dev_info * devip = NULL; 284 int inj_recovered = 0; 285 286 if (done == NULL) 287 return 0; /* assume mid level reprocessing command */ 288 289 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) { 290 printk(KERN_INFO "scsi_debug: cmd "); 291 for (k = 0, num = SCpnt->cmd_len; k < num; ++k) 292 printk("%02x ", (int)cmd[k]); 293 printk("\n"); 294 } 295 if(target == sdebug_driver_template.this_id) { 296 printk(KERN_INFO "scsi_debug: initiator's id used as " 297 "target!\n"); 298 return schedule_resp(SCpnt, NULL, done, 299 DID_NO_CONNECT << 16, 0); 300 } 301 302 if (SCpnt->device->lun >= scsi_debug_max_luns) 303 return schedule_resp(SCpnt, NULL, done, 304 DID_NO_CONNECT << 16, 0); 305 devip = devInfoReg(SCpnt->device); 306 if (NULL == devip) 307 return schedule_resp(SCpnt, NULL, done, 308 DID_NO_CONNECT << 16, 0); 309 310 if ((scsi_debug_every_nth != 0) && 311 (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) { 312 scsi_debug_cmnd_count = 0; 313 if (scsi_debug_every_nth < -1) 314 scsi_debug_every_nth = -1; 315 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts) 316 return 0; /* ignore command causing timeout */ 317 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts) 318 inj_recovered = 1; /* to reads and writes below */ 319 } 320 321 switch (*cmd) { 322 case INQUIRY: /* mandatory, ignore unit attention */ 323 errsts = resp_inquiry(SCpnt, target, devip); 324 break; 325 case REQUEST_SENSE: /* mandatory, ignore unit attention */ 326 errsts = resp_requests(SCpnt, devip); 327 break; 328 case REZERO_UNIT: /* actually this is REWIND for SSC */ 329 case START_STOP: 330 errsts = check_reset(SCpnt, devip); 331 break; 332 case ALLOW_MEDIUM_REMOVAL: 333 if ((errsts = check_reset(SCpnt, devip))) 334 break; 335 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 336 printk(KERN_INFO "scsi_debug: Medium removal %s\n", 337 cmd[4] ? "inhibited" : "enabled"); 338 break; 339 case SEND_DIAGNOSTIC: /* mandatory */ 340 errsts = check_reset(SCpnt, devip); 341 break; 342 case TEST_UNIT_READY: /* mandatory */ 343 errsts = check_reset(SCpnt, devip); 344 break; 345 case RESERVE: 346 errsts = check_reset(SCpnt, devip); 347 break; 348 case RESERVE_10: 349 errsts = check_reset(SCpnt, devip); 350 break; 351 case RELEASE: 352 errsts = check_reset(SCpnt, devip); 353 break; 354 case RELEASE_10: 355 errsts = check_reset(SCpnt, devip); 356 break; 357 case READ_CAPACITY: 358 errsts = resp_readcap(SCpnt, devip); 359 break; 360 case READ_16: 361 case READ_12: 362 case READ_10: 363 case READ_6: 364 if ((errsts = check_reset(SCpnt, devip))) 365 break; 366 upper_blk = 0; 367 if ((*cmd) == READ_16) { 368 upper_blk = cmd[5] + (cmd[4] << 8) + 369 (cmd[3] << 16) + (cmd[2] << 24); 370 block = cmd[9] + (cmd[8] << 8) + 371 (cmd[7] << 16) + (cmd[6] << 24); 372 num = cmd[13] + (cmd[12] << 8) + 373 (cmd[11] << 16) + (cmd[10] << 24); 374 } else if ((*cmd) == READ_12) { 375 block = cmd[5] + (cmd[4] << 8) + 376 (cmd[3] << 16) + (cmd[2] << 24); 377 num = cmd[9] + (cmd[8] << 8) + 378 (cmd[7] << 16) + (cmd[6] << 24); 379 } else if ((*cmd) == READ_10) { 380 block = cmd[5] + (cmd[4] << 8) + 381 (cmd[3] << 16) + (cmd[2] << 24); 382 num = cmd[8] + (cmd[7] << 8); 383 } else { 384 block = cmd[3] + (cmd[2] << 8) + 385 ((cmd[1] & 0x1f) << 16); 386 num = cmd[4]; 387 } 388 errsts = resp_read(SCpnt, upper_blk, block, num, devip); 389 if (inj_recovered && (0 == errsts)) { 390 mk_sense_buffer(devip, RECOVERED_ERROR, 391 THRESHHOLD_EXCEEDED, 0); 392 errsts = check_condition_result; 393 } 394 break; 395 case REPORT_LUNS: /* mandatory, ignore unit attention */ 396 errsts = resp_report_luns(SCpnt, devip); 397 break; 398 case VERIFY: /* 10 byte SBC-2 command */ 399 errsts = check_reset(SCpnt, devip); 400 break; 401 case WRITE_16: 402 case WRITE_12: 403 case WRITE_10: 404 case WRITE_6: 405 if ((errsts = check_reset(SCpnt, devip))) 406 break; 407 upper_blk = 0; 408 if ((*cmd) == WRITE_16) { 409 upper_blk = cmd[5] + (cmd[4] << 8) + 410 (cmd[3] << 16) + (cmd[2] << 24); 411 block = cmd[9] + (cmd[8] << 8) + 412 (cmd[7] << 16) + (cmd[6] << 24); 413 num = cmd[13] + (cmd[12] << 8) + 414 (cmd[11] << 16) + (cmd[10] << 24); 415 } else if ((*cmd) == WRITE_12) { 416 block = cmd[5] + (cmd[4] << 8) + 417 (cmd[3] << 16) + (cmd[2] << 24); 418 num = cmd[9] + (cmd[8] << 8) + 419 (cmd[7] << 16) + (cmd[6] << 24); 420 } else if ((*cmd) == WRITE_10) { 421 block = cmd[5] + (cmd[4] << 8) + 422 (cmd[3] << 16) + (cmd[2] << 24); 423 num = cmd[8] + (cmd[7] << 8); 424 } else { 425 block = cmd[3] + (cmd[2] << 8) + 426 ((cmd[1] & 0x1f) << 16); 427 num = cmd[4]; 428 } 429 errsts = resp_write(SCpnt, upper_blk, block, num, devip); 430 if (inj_recovered && (0 == errsts)) { 431 mk_sense_buffer(devip, RECOVERED_ERROR, 432 THRESHHOLD_EXCEEDED, 0); 433 errsts = check_condition_result; 434 } 435 break; 436 case MODE_SENSE: 437 case MODE_SENSE_10: 438 errsts = resp_mode_sense(SCpnt, target, devip); 439 break; 440 case SYNCHRONIZE_CACHE: 441 errsts = check_reset(SCpnt, devip); 442 break; 443 default: 444 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 445 printk(KERN_INFO "scsi_debug: Opcode: 0x%x not " 446 "supported\n", *cmd); 447 if ((errsts = check_reset(SCpnt, devip))) 448 break; /* Unit attention takes precedence */ 449 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0); 450 errsts = check_condition_result; 451 break; 452 } 453 return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay); 454 } 455 456 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) 457 { 458 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { 459 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd); 460 } 461 return -EINVAL; 462 /* return -ENOTTY; // correct return but upsets fdisk */ 463 } 464 465 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip) 466 { 467 if (devip->reset) { 468 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 469 printk(KERN_INFO "scsi_debug: Reporting Unit " 470 "attention: power on reset\n"); 471 devip->reset = 0; 472 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0); 473 return check_condition_result; 474 } 475 return 0; 476 } 477 478 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */ 479 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 480 int arr_len) 481 { 482 int k, req_len, act_len, len, active; 483 void * kaddr; 484 void * kaddr_off; 485 struct scatterlist * sgpnt; 486 487 if (0 == scp->request_bufflen) 488 return 0; 489 if (NULL == scp->request_buffer) 490 return (DID_ERROR << 16); 491 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || 492 (scp->sc_data_direction == DMA_FROM_DEVICE))) 493 return (DID_ERROR << 16); 494 if (0 == scp->use_sg) { 495 req_len = scp->request_bufflen; 496 act_len = (req_len < arr_len) ? req_len : arr_len; 497 memcpy(scp->request_buffer, arr, act_len); 498 scp->resid = req_len - act_len; 499 return 0; 500 } 501 sgpnt = (struct scatterlist *)scp->request_buffer; 502 active = 1; 503 for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) { 504 if (active) { 505 kaddr = (unsigned char *) 506 kmap_atomic(sgpnt->page, KM_USER0); 507 if (NULL == kaddr) 508 return (DID_ERROR << 16); 509 kaddr_off = (unsigned char *)kaddr + sgpnt->offset; 510 len = sgpnt->length; 511 if ((req_len + len) > arr_len) { 512 active = 0; 513 len = arr_len - req_len; 514 } 515 memcpy(kaddr_off, arr + req_len, len); 516 kunmap_atomic(kaddr, KM_USER0); 517 act_len += len; 518 } 519 req_len += sgpnt->length; 520 } 521 scp->resid = req_len - act_len; 522 return 0; 523 } 524 525 /* Returns number of bytes fetched into 'arr' or -1 if error. */ 526 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 527 int max_arr_len) 528 { 529 int k, req_len, len, fin; 530 void * kaddr; 531 void * kaddr_off; 532 struct scatterlist * sgpnt; 533 534 if (0 == scp->request_bufflen) 535 return 0; 536 if (NULL == scp->request_buffer) 537 return -1; 538 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || 539 (scp->sc_data_direction == DMA_TO_DEVICE))) 540 return -1; 541 if (0 == scp->use_sg) { 542 req_len = scp->request_bufflen; 543 len = (req_len < max_arr_len) ? req_len : max_arr_len; 544 memcpy(arr, scp->request_buffer, len); 545 return len; 546 } 547 sgpnt = (struct scatterlist *)scp->request_buffer; 548 for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) { 549 kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0); 550 if (NULL == kaddr) 551 return -1; 552 kaddr_off = (unsigned char *)kaddr + sgpnt->offset; 553 len = sgpnt->length; 554 if ((req_len + len) > max_arr_len) { 555 len = max_arr_len - req_len; 556 fin = 1; 557 } 558 memcpy(arr + req_len, kaddr_off, len); 559 kunmap_atomic(kaddr, KM_USER0); 560 if (fin) 561 return req_len + len; 562 req_len += sgpnt->length; 563 } 564 return req_len; 565 } 566 567 568 static const char * inq_vendor_id = "Linux "; 569 static const char * inq_product_id = "scsi_debug "; 570 static const char * inq_product_rev = "0004"; 571 572 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, 573 const char * dev_id_str, int dev_id_str_len) 574 { 575 int num; 576 577 /* Two identification descriptors: */ 578 /* T10 vendor identifier field format (faked) */ 579 arr[0] = 0x2; /* ASCII */ 580 arr[1] = 0x1; 581 arr[2] = 0x0; 582 memcpy(&arr[4], inq_vendor_id, 8); 583 memcpy(&arr[12], inq_product_id, 16); 584 memcpy(&arr[28], dev_id_str, dev_id_str_len); 585 num = 8 + 16 + dev_id_str_len; 586 arr[3] = num; 587 num += 4; 588 /* NAA IEEE registered identifier (faked) */ 589 arr[num] = 0x1; /* binary */ 590 arr[num + 1] = 0x3; 591 arr[num + 2] = 0x0; 592 arr[num + 3] = 0x8; 593 arr[num + 4] = 0x51; /* ieee company id=0x123456 (faked) */ 594 arr[num + 5] = 0x23; 595 arr[num + 6] = 0x45; 596 arr[num + 7] = 0x60; 597 arr[num + 8] = (dev_id_num >> 24); 598 arr[num + 9] = (dev_id_num >> 16) & 0xff; 599 arr[num + 10] = (dev_id_num >> 8) & 0xff; 600 arr[num + 11] = dev_id_num & 0xff; 601 return num + 12; 602 } 603 604 605 #define SDEBUG_LONG_INQ_SZ 96 606 #define SDEBUG_MAX_INQ_ARR_SZ 128 607 608 static int resp_inquiry(struct scsi_cmnd * scp, int target, 609 struct sdebug_dev_info * devip) 610 { 611 unsigned char pq_pdt; 612 unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ]; 613 unsigned char *cmd = (unsigned char *)scp->cmnd; 614 int alloc_len; 615 616 alloc_len = (cmd[3] << 8) + cmd[4]; 617 memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ); 618 pq_pdt = (scsi_debug_ptype & 0x1f); 619 arr[0] = pq_pdt; 620 if (0x2 & cmd[1]) { /* CMDDT bit set */ 621 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 622 0); 623 return check_condition_result; 624 } else if (0x1 & cmd[1]) { /* EVPD bit set */ 625 int dev_id_num, len; 626 char dev_id_str[6]; 627 628 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) + 629 (devip->target * 1000) + devip->lun; 630 len = scnprintf(dev_id_str, 6, "%d", dev_id_num); 631 if (0 == cmd[2]) { /* supported vital product data pages */ 632 arr[3] = 3; 633 arr[4] = 0x0; /* this page */ 634 arr[5] = 0x80; /* unit serial number */ 635 arr[6] = 0x83; /* device identification */ 636 } else if (0x80 == cmd[2]) { /* unit serial number */ 637 arr[1] = 0x80; 638 arr[3] = len; 639 memcpy(&arr[4], dev_id_str, len); 640 } else if (0x83 == cmd[2]) { /* device identification */ 641 arr[1] = 0x83; 642 arr[3] = inquiry_evpd_83(&arr[4], dev_id_num, 643 dev_id_str, len); 644 } else { 645 /* Illegal request, invalid field in cdb */ 646 mk_sense_buffer(devip, ILLEGAL_REQUEST, 647 INVALID_FIELD_IN_CDB, 0); 648 return check_condition_result; 649 } 650 return fill_from_dev_buffer(scp, arr, 651 min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ)); 652 } 653 /* drops through here for a standard inquiry */ 654 arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0; /* Removable disk */ 655 arr[2] = scsi_debug_scsi_level; 656 arr[3] = 2; /* response_data_format==2 */ 657 arr[4] = SDEBUG_LONG_INQ_SZ - 5; 658 arr[6] = 0x1; /* claim: ADDR16 */ 659 /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */ 660 arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */ 661 memcpy(&arr[8], inq_vendor_id, 8); 662 memcpy(&arr[16], inq_product_id, 16); 663 memcpy(&arr[32], inq_product_rev, 4); 664 /* version descriptors (2 bytes each) follow */ 665 arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */ 666 arr[60] = 0x3; arr[61] = 0x0; /* SPC-3 */ 667 if (scsi_debug_ptype == 0) { 668 arr[62] = 0x1; arr[63] = 0x80; /* SBC */ 669 } else if (scsi_debug_ptype == 1) { 670 arr[62] = 0x2; arr[63] = 0x00; /* SSC */ 671 } 672 return fill_from_dev_buffer(scp, arr, 673 min(alloc_len, SDEBUG_LONG_INQ_SZ)); 674 } 675 676 static int resp_requests(struct scsi_cmnd * scp, 677 struct sdebug_dev_info * devip) 678 { 679 unsigned char * sbuff; 680 unsigned char *cmd = (unsigned char *)scp->cmnd; 681 unsigned char arr[SDEBUG_SENSE_LEN]; 682 int len = 18; 683 684 memset(arr, 0, SDEBUG_SENSE_LEN); 685 if (devip->reset == 1) 686 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); 687 sbuff = devip->sense_buff; 688 if ((cmd[1] & 1) && (! scsi_debug_dsense)) { 689 /* DESC bit set and sense_buff in fixed format */ 690 arr[0] = 0x72; 691 arr[1] = sbuff[2]; /* sense key */ 692 arr[2] = sbuff[12]; /* asc */ 693 arr[3] = sbuff[13]; /* ascq */ 694 len = 8; 695 } else 696 memcpy(arr, sbuff, SDEBUG_SENSE_LEN); 697 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); 698 return fill_from_dev_buffer(scp, arr, len); 699 } 700 701 #define SDEBUG_READCAP_ARR_SZ 8 702 static int resp_readcap(struct scsi_cmnd * scp, 703 struct sdebug_dev_info * devip) 704 { 705 unsigned char arr[SDEBUG_READCAP_ARR_SZ]; 706 unsigned long capac; 707 int errsts; 708 709 if ((errsts = check_reset(scp, devip))) 710 return errsts; 711 memset(arr, 0, SDEBUG_READCAP_ARR_SZ); 712 capac = (unsigned long)sdebug_capacity - 1; 713 arr[0] = (capac >> 24); 714 arr[1] = (capac >> 16) & 0xff; 715 arr[2] = (capac >> 8) & 0xff; 716 arr[3] = capac & 0xff; 717 arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff; 718 arr[7] = SECT_SIZE_PER(target) & 0xff; 719 return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ); 720 } 721 722 /* <<Following mode page info copied from ST318451LW>> */ 723 724 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target) 725 { /* Read-Write Error Recovery page for mode_sense */ 726 unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0, 727 5, 0, 0xff, 0xff}; 728 729 memcpy(p, err_recov_pg, sizeof(err_recov_pg)); 730 if (1 == pcontrol) 731 memset(p + 2, 0, sizeof(err_recov_pg) - 2); 732 return sizeof(err_recov_pg); 733 } 734 735 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target) 736 { /* Disconnect-Reconnect page for mode_sense */ 737 unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0, 738 0, 0, 0, 0, 0, 0, 0, 0}; 739 740 memcpy(p, disconnect_pg, sizeof(disconnect_pg)); 741 if (1 == pcontrol) 742 memset(p + 2, 0, sizeof(disconnect_pg) - 2); 743 return sizeof(disconnect_pg); 744 } 745 746 static int resp_format_pg(unsigned char * p, int pcontrol, int target) 747 { /* Format device page for mode_sense */ 748 unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0, 749 0, 0, 0, 0, 0, 0, 0, 0, 750 0, 0, 0, 0, 0x40, 0, 0, 0}; 751 752 memcpy(p, format_pg, sizeof(format_pg)); 753 p[10] = (sdebug_sectors_per >> 8) & 0xff; 754 p[11] = sdebug_sectors_per & 0xff; 755 p[12] = (SECT_SIZE >> 8) & 0xff; 756 p[13] = SECT_SIZE & 0xff; 757 if (DEV_REMOVEABLE(target)) 758 p[20] |= 0x20; /* should agree with INQUIRY */ 759 if (1 == pcontrol) 760 memset(p + 2, 0, sizeof(format_pg) - 2); 761 return sizeof(format_pg); 762 } 763 764 static int resp_caching_pg(unsigned char * p, int pcontrol, int target) 765 { /* Caching page for mode_sense */ 766 unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, 767 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0}; 768 769 memcpy(p, caching_pg, sizeof(caching_pg)); 770 if (1 == pcontrol) 771 memset(p + 2, 0, sizeof(caching_pg) - 2); 772 return sizeof(caching_pg); 773 } 774 775 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target) 776 { /* Control mode page for mode_sense */ 777 unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, 778 0, 0, 0x2, 0x4b}; 779 780 if (scsi_debug_dsense) 781 ctrl_m_pg[2] |= 0x4; 782 memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg)); 783 if (1 == pcontrol) 784 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2); 785 return sizeof(ctrl_m_pg); 786 } 787 788 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target) 789 { /* Informational Exceptions control mode page for mode_sense */ 790 unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, 791 0, 0, 0x0, 0x0}; 792 memcpy(p, iec_m_pg, sizeof(iec_m_pg)); 793 if (1 == pcontrol) 794 memset(p + 2, 0, sizeof(iec_m_pg) - 2); 795 return sizeof(iec_m_pg); 796 } 797 798 #define SDEBUG_MAX_MSENSE_SZ 256 799 800 static int resp_mode_sense(struct scsi_cmnd * scp, int target, 801 struct sdebug_dev_info * devip) 802 { 803 unsigned char dbd; 804 int pcontrol, pcode, subpcode; 805 unsigned char dev_spec; 806 int alloc_len, msense_6, offset, len, errsts; 807 unsigned char * ap; 808 unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; 809 unsigned char *cmd = (unsigned char *)scp->cmnd; 810 811 if ((errsts = check_reset(scp, devip))) 812 return errsts; 813 dbd = cmd[1] & 0x8; 814 pcontrol = (cmd[2] & 0xc0) >> 6; 815 pcode = cmd[2] & 0x3f; 816 subpcode = cmd[3]; 817 msense_6 = (MODE_SENSE == cmd[0]); 818 alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]); 819 memset(arr, 0, SDEBUG_MAX_MSENSE_SZ); 820 if (0x3 == pcontrol) { /* Saving values not supported */ 821 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 822 0); 823 return check_condition_result; 824 } 825 dev_spec = DEV_READONLY(target) ? 0x80 : 0x0; 826 if (msense_6) { 827 arr[2] = dev_spec; 828 offset = 4; 829 } else { 830 arr[3] = dev_spec; 831 offset = 8; 832 } 833 ap = arr + offset; 834 835 if (0 != subpcode) { /* TODO: Control Extension page */ 836 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 837 0); 838 return check_condition_result; 839 } 840 switch (pcode) { 841 case 0x1: /* Read-Write error recovery page, direct access */ 842 len = resp_err_recov_pg(ap, pcontrol, target); 843 offset += len; 844 break; 845 case 0x2: /* Disconnect-Reconnect page, all devices */ 846 len = resp_disconnect_pg(ap, pcontrol, target); 847 offset += len; 848 break; 849 case 0x3: /* Format device page, direct access */ 850 len = resp_format_pg(ap, pcontrol, target); 851 offset += len; 852 break; 853 case 0x8: /* Caching page, direct access */ 854 len = resp_caching_pg(ap, pcontrol, target); 855 offset += len; 856 break; 857 case 0xa: /* Control Mode page, all devices */ 858 len = resp_ctrl_m_pg(ap, pcontrol, target); 859 offset += len; 860 break; 861 case 0x1c: /* Informational Exceptions Mode page, all devices */ 862 len = resp_iec_m_pg(ap, pcontrol, target); 863 offset += len; 864 break; 865 case 0x3f: /* Read all Mode pages */ 866 len = resp_err_recov_pg(ap, pcontrol, target); 867 len += resp_disconnect_pg(ap + len, pcontrol, target); 868 len += resp_format_pg(ap + len, pcontrol, target); 869 len += resp_caching_pg(ap + len, pcontrol, target); 870 len += resp_ctrl_m_pg(ap + len, pcontrol, target); 871 len += resp_iec_m_pg(ap + len, pcontrol, target); 872 offset += len; 873 break; 874 default: 875 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 876 0); 877 return check_condition_result; 878 } 879 if (msense_6) 880 arr[0] = offset - 1; 881 else { 882 arr[0] = ((offset - 2) >> 8) & 0xff; 883 arr[1] = (offset - 2) & 0xff; 884 } 885 return fill_from_dev_buffer(scp, arr, min(alloc_len, offset)); 886 } 887 888 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, 889 int num, struct sdebug_dev_info * devip) 890 { 891 unsigned long iflags; 892 int ret; 893 894 if (upper_blk || (block + num > sdebug_capacity)) { 895 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 896 0); 897 return check_condition_result; 898 } 899 if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) && 900 (block <= OPT_MEDIUM_ERR_ADDR) && 901 ((block + num) > OPT_MEDIUM_ERR_ADDR)) { 902 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 903 0); 904 /* claim unrecoverable read error */ 905 return check_condition_result; 906 } 907 read_lock_irqsave(&atomic_rw, iflags); 908 ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), 909 num * SECT_SIZE); 910 read_unlock_irqrestore(&atomic_rw, iflags); 911 return ret; 912 } 913 914 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, 915 int num, struct sdebug_dev_info * devip) 916 { 917 unsigned long iflags; 918 int res; 919 920 if (upper_blk || (block + num > sdebug_capacity)) { 921 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 922 0); 923 return check_condition_result; 924 } 925 926 write_lock_irqsave(&atomic_rw, iflags); 927 res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), 928 num * SECT_SIZE); 929 write_unlock_irqrestore(&atomic_rw, iflags); 930 if (-1 == res) 931 return (DID_ERROR << 16); 932 else if ((res < (num * SECT_SIZE)) && 933 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) 934 printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, " 935 " IO sent=%d bytes\n", num * SECT_SIZE, res); 936 return 0; 937 } 938 939 #define SDEBUG_RLUN_ARR_SZ 128 940 941 static int resp_report_luns(struct scsi_cmnd * scp, 942 struct sdebug_dev_info * devip) 943 { 944 unsigned int alloc_len; 945 int lun_cnt, i, upper; 946 unsigned char *cmd = (unsigned char *)scp->cmnd; 947 int select_report = (int)cmd[2]; 948 struct scsi_lun *one_lun; 949 unsigned char arr[SDEBUG_RLUN_ARR_SZ]; 950 951 alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); 952 if ((alloc_len < 16) || (select_report > 2)) { 953 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 954 0); 955 return check_condition_result; 956 } 957 /* can produce response with up to 16k luns (lun 0 to lun 16383) */ 958 memset(arr, 0, SDEBUG_RLUN_ARR_SZ); 959 lun_cnt = scsi_debug_max_luns; 960 arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff; 961 arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff; 962 lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) / 963 sizeof(struct scsi_lun)), lun_cnt); 964 one_lun = (struct scsi_lun *) &arr[8]; 965 for (i = 0; i < lun_cnt; i++) { 966 upper = (i >> 8) & 0x3f; 967 if (upper) 968 one_lun[i].scsi_lun[0] = 969 (upper | (SAM2_LUN_ADDRESS_METHOD << 6)); 970 one_lun[i].scsi_lun[1] = i & 0xff; 971 } 972 return fill_from_dev_buffer(scp, arr, 973 min((int)alloc_len, SDEBUG_RLUN_ARR_SZ)); 974 } 975 976 /* When timer goes off this function is called. */ 977 static void timer_intr_handler(unsigned long indx) 978 { 979 struct sdebug_queued_cmd * sqcp; 980 unsigned long iflags; 981 982 if (indx >= SCSI_DEBUG_CANQUEUE) { 983 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too " 984 "large\n"); 985 return; 986 } 987 spin_lock_irqsave(&queued_arr_lock, iflags); 988 sqcp = &queued_arr[(int)indx]; 989 if (! sqcp->in_use) { 990 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected " 991 "interrupt\n"); 992 spin_unlock_irqrestore(&queued_arr_lock, iflags); 993 return; 994 } 995 sqcp->in_use = 0; 996 if (sqcp->done_funct) { 997 sqcp->a_cmnd->result = sqcp->scsi_result; 998 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */ 999 } 1000 sqcp->done_funct = NULL; 1001 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1002 } 1003 1004 static int scsi_debug_slave_alloc(struct scsi_device * sdp) 1005 { 1006 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1007 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_alloc\n"); 1008 return 0; 1009 } 1010 1011 static int scsi_debug_slave_configure(struct scsi_device * sdp) 1012 { 1013 struct sdebug_dev_info * devip; 1014 1015 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1016 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_configure\n"); 1017 if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN) 1018 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN; 1019 devip = devInfoReg(sdp); 1020 sdp->hostdata = devip; 1021 if (sdp->host->cmd_per_lun) 1022 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING, 1023 sdp->host->cmd_per_lun); 1024 return 0; 1025 } 1026 1027 static void scsi_debug_slave_destroy(struct scsi_device * sdp) 1028 { 1029 struct sdebug_dev_info * devip = 1030 (struct sdebug_dev_info *)sdp->hostdata; 1031 1032 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1033 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_destroy\n"); 1034 if (devip) { 1035 /* make this slot avaliable for re-use */ 1036 devip->used = 0; 1037 sdp->hostdata = NULL; 1038 } 1039 } 1040 1041 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev) 1042 { 1043 struct sdebug_host_info * sdbg_host; 1044 struct sdebug_dev_info * open_devip = NULL; 1045 struct sdebug_dev_info * devip = 1046 (struct sdebug_dev_info *)sdev->hostdata; 1047 1048 if (devip) 1049 return devip; 1050 sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata; 1051 if(! sdbg_host) { 1052 printk(KERN_ERR "Host info NULL\n"); 1053 return NULL; 1054 } 1055 list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { 1056 if ((devip->used) && (devip->channel == sdev->channel) && 1057 (devip->target == sdev->id) && 1058 (devip->lun == sdev->lun)) 1059 return devip; 1060 else { 1061 if ((!devip->used) && (!open_devip)) 1062 open_devip = devip; 1063 } 1064 } 1065 if (NULL == open_devip) { /* try and make a new one */ 1066 open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL); 1067 if (NULL == open_devip) { 1068 printk(KERN_ERR "%s: out of memory at line %d\n", 1069 __FUNCTION__, __LINE__); 1070 return NULL; 1071 } 1072 memset(open_devip, 0, sizeof(*open_devip)); 1073 open_devip->sdbg_host = sdbg_host; 1074 list_add_tail(&open_devip->dev_list, 1075 &sdbg_host->dev_info_list); 1076 } 1077 if (open_devip) { 1078 open_devip->channel = sdev->channel; 1079 open_devip->target = sdev->id; 1080 open_devip->lun = sdev->lun; 1081 open_devip->sdbg_host = sdbg_host; 1082 open_devip->reset = 1; 1083 open_devip->used = 1; 1084 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN); 1085 if (scsi_debug_dsense) 1086 open_devip->sense_buff[0] = 0x72; 1087 else { 1088 open_devip->sense_buff[0] = 0x70; 1089 open_devip->sense_buff[7] = 0xa; 1090 } 1091 return open_devip; 1092 } 1093 return NULL; 1094 } 1095 1096 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, 1097 int asc, int asq) 1098 { 1099 unsigned char * sbuff; 1100 1101 sbuff = devip->sense_buff; 1102 memset(sbuff, 0, SDEBUG_SENSE_LEN); 1103 if (scsi_debug_dsense) { 1104 sbuff[0] = 0x72; /* descriptor, current */ 1105 sbuff[1] = key; 1106 sbuff[2] = asc; 1107 sbuff[3] = asq; 1108 } else { 1109 sbuff[0] = 0x70; /* fixed, current */ 1110 sbuff[2] = key; 1111 sbuff[7] = 0xa; /* implies 18 byte sense buffer */ 1112 sbuff[12] = asc; 1113 sbuff[13] = asq; 1114 } 1115 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1116 printk(KERN_INFO "scsi_debug: [sense_key,asc,ascq]: " 1117 "[0x%x,0x%x,0x%x]\n", key, asc, asq); 1118 } 1119 1120 static int scsi_debug_abort(struct scsi_cmnd * SCpnt) 1121 { 1122 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1123 printk(KERN_INFO "scsi_debug: abort\n"); 1124 ++num_aborts; 1125 stop_queued_cmnd(SCpnt); 1126 return SUCCESS; 1127 } 1128 1129 static int scsi_debug_biosparam(struct scsi_device *sdev, 1130 struct block_device * bdev, sector_t capacity, int *info) 1131 { 1132 int res; 1133 unsigned char *buf; 1134 1135 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1136 printk(KERN_INFO "scsi_debug: biosparam\n"); 1137 buf = scsi_bios_ptable(bdev); 1138 if (buf) { 1139 res = scsi_partsize(buf, capacity, 1140 &info[2], &info[0], &info[1]); 1141 kfree(buf); 1142 if (! res) 1143 return res; 1144 } 1145 info[0] = sdebug_heads; 1146 info[1] = sdebug_sectors_per; 1147 info[2] = sdebug_cylinders_per; 1148 return 0; 1149 } 1150 1151 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt) 1152 { 1153 struct sdebug_dev_info * devip; 1154 1155 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1156 printk(KERN_INFO "scsi_debug: device_reset\n"); 1157 ++num_dev_resets; 1158 if (SCpnt) { 1159 devip = devInfoReg(SCpnt->device); 1160 if (devip) 1161 devip->reset = 1; 1162 } 1163 return SUCCESS; 1164 } 1165 1166 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt) 1167 { 1168 struct sdebug_host_info *sdbg_host; 1169 struct sdebug_dev_info * dev_info; 1170 struct scsi_device * sdp; 1171 struct Scsi_Host * hp; 1172 1173 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1174 printk(KERN_INFO "scsi_debug: bus_reset\n"); 1175 ++num_bus_resets; 1176 if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) { 1177 sdbg_host = *(struct sdebug_host_info **) hp->hostdata; 1178 if (sdbg_host) { 1179 list_for_each_entry(dev_info, 1180 &sdbg_host->dev_info_list, 1181 dev_list) 1182 dev_info->reset = 1; 1183 } 1184 } 1185 return SUCCESS; 1186 } 1187 1188 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt) 1189 { 1190 struct sdebug_host_info * sdbg_host; 1191 struct sdebug_dev_info * dev_info; 1192 1193 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1194 printk(KERN_INFO "scsi_debug: host_reset\n"); 1195 ++num_host_resets; 1196 spin_lock(&sdebug_host_list_lock); 1197 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { 1198 list_for_each_entry(dev_info, &sdbg_host->dev_info_list, 1199 dev_list) 1200 dev_info->reset = 1; 1201 } 1202 spin_unlock(&sdebug_host_list_lock); 1203 stop_all_queued(); 1204 return SUCCESS; 1205 } 1206 1207 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */ 1208 static int stop_queued_cmnd(struct scsi_cmnd * cmnd) 1209 { 1210 unsigned long iflags; 1211 int k; 1212 struct sdebug_queued_cmd * sqcp; 1213 1214 spin_lock_irqsave(&queued_arr_lock, iflags); 1215 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1216 sqcp = &queued_arr[k]; 1217 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) { 1218 del_timer_sync(&sqcp->cmnd_timer); 1219 sqcp->in_use = 0; 1220 sqcp->a_cmnd = NULL; 1221 break; 1222 } 1223 } 1224 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1225 return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0; 1226 } 1227 1228 /* Deletes (stops) timers of all queued commands */ 1229 static void stop_all_queued(void) 1230 { 1231 unsigned long iflags; 1232 int k; 1233 struct sdebug_queued_cmd * sqcp; 1234 1235 spin_lock_irqsave(&queued_arr_lock, iflags); 1236 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1237 sqcp = &queued_arr[k]; 1238 if (sqcp->in_use && sqcp->a_cmnd) { 1239 del_timer_sync(&sqcp->cmnd_timer); 1240 sqcp->in_use = 0; 1241 sqcp->a_cmnd = NULL; 1242 } 1243 } 1244 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1245 } 1246 1247 /* Initializes timers in queued array */ 1248 static void __init init_all_queued(void) 1249 { 1250 unsigned long iflags; 1251 int k; 1252 struct sdebug_queued_cmd * sqcp; 1253 1254 spin_lock_irqsave(&queued_arr_lock, iflags); 1255 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1256 sqcp = &queued_arr[k]; 1257 init_timer(&sqcp->cmnd_timer); 1258 sqcp->in_use = 0; 1259 sqcp->a_cmnd = NULL; 1260 } 1261 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1262 } 1263 1264 static void __init sdebug_build_parts(unsigned char * ramp) 1265 { 1266 struct partition * pp; 1267 int starts[SDEBUG_MAX_PARTS + 2]; 1268 int sectors_per_part, num_sectors, k; 1269 int heads_by_sects, start_sec, end_sec; 1270 1271 /* assume partition table already zeroed */ 1272 if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576)) 1273 return; 1274 if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) { 1275 scsi_debug_num_parts = SDEBUG_MAX_PARTS; 1276 printk(KERN_WARNING "scsi_debug:build_parts: reducing " 1277 "partitions to %d\n", SDEBUG_MAX_PARTS); 1278 } 1279 num_sectors = (int)(sdebug_store_size / SECT_SIZE); 1280 sectors_per_part = (num_sectors - sdebug_sectors_per) 1281 / scsi_debug_num_parts; 1282 heads_by_sects = sdebug_heads * sdebug_sectors_per; 1283 starts[0] = sdebug_sectors_per; 1284 for (k = 1; k < scsi_debug_num_parts; ++k) 1285 starts[k] = ((k * sectors_per_part) / heads_by_sects) 1286 * heads_by_sects; 1287 starts[scsi_debug_num_parts] = num_sectors; 1288 starts[scsi_debug_num_parts + 1] = 0; 1289 1290 ramp[510] = 0x55; /* magic partition markings */ 1291 ramp[511] = 0xAA; 1292 pp = (struct partition *)(ramp + 0x1be); 1293 for (k = 0; starts[k + 1]; ++k, ++pp) { 1294 start_sec = starts[k]; 1295 end_sec = starts[k + 1] - 1; 1296 pp->boot_ind = 0; 1297 1298 pp->cyl = start_sec / heads_by_sects; 1299 pp->head = (start_sec - (pp->cyl * heads_by_sects)) 1300 / sdebug_sectors_per; 1301 pp->sector = (start_sec % sdebug_sectors_per) + 1; 1302 1303 pp->end_cyl = end_sec / heads_by_sects; 1304 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects)) 1305 / sdebug_sectors_per; 1306 pp->end_sector = (end_sec % sdebug_sectors_per) + 1; 1307 1308 pp->start_sect = start_sec; 1309 pp->nr_sects = end_sec - start_sec + 1; 1310 pp->sys_ind = 0x83; /* plain Linux partition */ 1311 } 1312 } 1313 1314 static int schedule_resp(struct scsi_cmnd * cmnd, 1315 struct sdebug_dev_info * devip, 1316 done_funct_t done, int scsi_result, int delta_jiff) 1317 { 1318 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) { 1319 if (scsi_result) { 1320 struct scsi_device * sdp = cmnd->device; 1321 1322 sdev_printk(KERN_INFO, sdp, 1323 "non-zero result=0x%x\n", 1324 scsi_result); 1325 } 1326 } 1327 if (cmnd && devip) { 1328 /* simulate autosense by this driver */ 1329 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff)) 1330 memcpy(cmnd->sense_buffer, devip->sense_buff, 1331 (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ? 1332 SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE); 1333 } 1334 if (delta_jiff <= 0) { 1335 if (cmnd) 1336 cmnd->result = scsi_result; 1337 if (done) 1338 done(cmnd); 1339 return 0; 1340 } else { 1341 unsigned long iflags; 1342 int k; 1343 struct sdebug_queued_cmd * sqcp = NULL; 1344 1345 spin_lock_irqsave(&queued_arr_lock, iflags); 1346 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1347 sqcp = &queued_arr[k]; 1348 if (! sqcp->in_use) 1349 break; 1350 } 1351 if (k >= SCSI_DEBUG_CANQUEUE) { 1352 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1353 printk(KERN_WARNING "scsi_debug: can_queue exceeded\n"); 1354 return 1; /* report busy to mid level */ 1355 } 1356 sqcp->in_use = 1; 1357 sqcp->a_cmnd = cmnd; 1358 sqcp->scsi_result = scsi_result; 1359 sqcp->done_funct = done; 1360 sqcp->cmnd_timer.function = timer_intr_handler; 1361 sqcp->cmnd_timer.data = k; 1362 sqcp->cmnd_timer.expires = jiffies + delta_jiff; 1363 add_timer(&sqcp->cmnd_timer); 1364 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1365 if (cmnd) 1366 cmnd->result = 0; 1367 return 0; 1368 } 1369 } 1370 1371 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1372 * of sysfs parameters (which module_param doesn't yet support). 1373 * Sysfs parameters defined explicitly below. 1374 */ 1375 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */ 1376 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */ 1377 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0); 1378 module_param_named(dsense, scsi_debug_dsense, int, 0); 1379 module_param_named(every_nth, scsi_debug_every_nth, int, 0); 1380 module_param_named(max_luns, scsi_debug_max_luns, int, 0); 1381 module_param_named(num_parts, scsi_debug_num_parts, int, 0); 1382 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0); 1383 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */ 1384 module_param_named(ptype, scsi_debug_ptype, int, 0); 1385 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0); 1386 1387 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert"); 1388 MODULE_DESCRIPTION("SCSI debug adapter driver"); 1389 MODULE_LICENSE("GPL"); 1390 MODULE_VERSION(SCSI_DEBUG_VERSION); 1391 1392 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); 1393 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)"); 1394 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs"); 1395 MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)"); 1396 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)"); 1397 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate"); 1398 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)"); 1399 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate"); 1400 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->..."); 1401 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); 1402 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])"); 1403 1404 1405 static char sdebug_info[256]; 1406 1407 static const char * scsi_debug_info(struct Scsi_Host * shp) 1408 { 1409 sprintf(sdebug_info, "scsi_debug, version %s [%s], " 1410 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION, 1411 scsi_debug_version_date, scsi_debug_dev_size_mb, 1412 scsi_debug_opts); 1413 return sdebug_info; 1414 } 1415 1416 /* scsi_debug_proc_info 1417 * Used if the driver currently has no own support for /proc/scsi 1418 */ 1419 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, 1420 int length, int inout) 1421 { 1422 int len, pos, begin; 1423 int orig_length; 1424 1425 orig_length = length; 1426 1427 if (inout == 1) { 1428 char arr[16]; 1429 int minLen = length > 15 ? 15 : length; 1430 1431 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1432 return -EACCES; 1433 memcpy(arr, buffer, minLen); 1434 arr[minLen] = '\0'; 1435 if (1 != sscanf(arr, "%d", &pos)) 1436 return -EINVAL; 1437 scsi_debug_opts = pos; 1438 if (scsi_debug_every_nth != 0) 1439 scsi_debug_cmnd_count = 0; 1440 return length; 1441 } 1442 begin = 0; 1443 pos = len = sprintf(buffer, "scsi_debug adapter driver, version " 1444 "%s [%s]\n" 1445 "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, " 1446 "every_nth=%d(curr:%d)\n" 1447 "delay=%d, max_luns=%d, scsi_level=%d\n" 1448 "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n" 1449 "number of aborts=%d, device_reset=%d, bus_resets=%d, " 1450 "host_resets=%d\n", 1451 SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts, 1452 scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth, 1453 scsi_debug_cmnd_count, scsi_debug_delay, 1454 scsi_debug_max_luns, scsi_debug_scsi_level, 1455 SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per, 1456 num_aborts, num_dev_resets, num_bus_resets, num_host_resets); 1457 if (pos < offset) { 1458 len = 0; 1459 begin = pos; 1460 } 1461 *start = buffer + (offset - begin); /* Start of wanted data */ 1462 len -= (offset - begin); 1463 if (len > length) 1464 len = length; 1465 return len; 1466 } 1467 1468 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf) 1469 { 1470 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay); 1471 } 1472 1473 static ssize_t sdebug_delay_store(struct device_driver * ddp, 1474 const char * buf, size_t count) 1475 { 1476 int delay; 1477 char work[20]; 1478 1479 if (1 == sscanf(buf, "%10s", work)) { 1480 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) { 1481 scsi_debug_delay = delay; 1482 return count; 1483 } 1484 } 1485 return -EINVAL; 1486 } 1487 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show, 1488 sdebug_delay_store); 1489 1490 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf) 1491 { 1492 return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts); 1493 } 1494 1495 static ssize_t sdebug_opts_store(struct device_driver * ddp, 1496 const char * buf, size_t count) 1497 { 1498 int opts; 1499 char work[20]; 1500 1501 if (1 == sscanf(buf, "%10s", work)) { 1502 if (0 == strnicmp(work,"0x", 2)) { 1503 if (1 == sscanf(&work[2], "%x", &opts)) 1504 goto opts_done; 1505 } else { 1506 if (1 == sscanf(work, "%d", &opts)) 1507 goto opts_done; 1508 } 1509 } 1510 return -EINVAL; 1511 opts_done: 1512 scsi_debug_opts = opts; 1513 scsi_debug_cmnd_count = 0; 1514 return count; 1515 } 1516 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show, 1517 sdebug_opts_store); 1518 1519 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf) 1520 { 1521 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype); 1522 } 1523 static ssize_t sdebug_ptype_store(struct device_driver * ddp, 1524 const char * buf, size_t count) 1525 { 1526 int n; 1527 1528 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1529 scsi_debug_ptype = n; 1530 return count; 1531 } 1532 return -EINVAL; 1533 } 1534 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store); 1535 1536 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf) 1537 { 1538 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense); 1539 } 1540 static ssize_t sdebug_dsense_store(struct device_driver * ddp, 1541 const char * buf, size_t count) 1542 { 1543 int n; 1544 1545 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1546 scsi_debug_dsense = n; 1547 return count; 1548 } 1549 return -EINVAL; 1550 } 1551 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show, 1552 sdebug_dsense_store); 1553 1554 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf) 1555 { 1556 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts); 1557 } 1558 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp, 1559 const char * buf, size_t count) 1560 { 1561 int n; 1562 1563 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1564 scsi_debug_num_tgts = n; 1565 sdebug_max_tgts_luns(); 1566 return count; 1567 } 1568 return -EINVAL; 1569 } 1570 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show, 1571 sdebug_num_tgts_store); 1572 1573 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf) 1574 { 1575 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb); 1576 } 1577 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL); 1578 1579 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf) 1580 { 1581 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts); 1582 } 1583 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL); 1584 1585 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf) 1586 { 1587 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth); 1588 } 1589 static ssize_t sdebug_every_nth_store(struct device_driver * ddp, 1590 const char * buf, size_t count) 1591 { 1592 int nth; 1593 1594 if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) { 1595 scsi_debug_every_nth = nth; 1596 scsi_debug_cmnd_count = 0; 1597 return count; 1598 } 1599 return -EINVAL; 1600 } 1601 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show, 1602 sdebug_every_nth_store); 1603 1604 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf) 1605 { 1606 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns); 1607 } 1608 static ssize_t sdebug_max_luns_store(struct device_driver * ddp, 1609 const char * buf, size_t count) 1610 { 1611 int n; 1612 1613 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1614 scsi_debug_max_luns = n; 1615 sdebug_max_tgts_luns(); 1616 return count; 1617 } 1618 return -EINVAL; 1619 } 1620 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show, 1621 sdebug_max_luns_store); 1622 1623 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf) 1624 { 1625 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level); 1626 } 1627 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL); 1628 1629 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf) 1630 { 1631 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host); 1632 } 1633 1634 static ssize_t sdebug_add_host_store(struct device_driver * ddp, 1635 const char * buf, size_t count) 1636 { 1637 int delta_hosts; 1638 char work[20]; 1639 1640 if (1 != sscanf(buf, "%10s", work)) 1641 return -EINVAL; 1642 { /* temporary hack around sscanf() problem with -ve nums */ 1643 int neg = 0; 1644 1645 if ('-' == *work) 1646 neg = 1; 1647 if (1 != sscanf(work + neg, "%d", &delta_hosts)) 1648 return -EINVAL; 1649 if (neg) 1650 delta_hosts = -delta_hosts; 1651 } 1652 if (delta_hosts > 0) { 1653 do { 1654 sdebug_add_adapter(); 1655 } while (--delta_hosts); 1656 } else if (delta_hosts < 0) { 1657 do { 1658 sdebug_remove_adapter(); 1659 } while (++delta_hosts); 1660 } 1661 return count; 1662 } 1663 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show, 1664 sdebug_add_host_store); 1665 1666 static void do_create_driverfs_files(void) 1667 { 1668 driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host); 1669 driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay); 1670 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); 1671 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense); 1672 driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth); 1673 driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns); 1674 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); 1675 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts); 1676 driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype); 1677 driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts); 1678 driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); 1679 } 1680 1681 static void do_remove_driverfs_files(void) 1682 { 1683 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); 1684 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts); 1685 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype); 1686 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts); 1687 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); 1688 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns); 1689 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth); 1690 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense); 1691 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); 1692 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay); 1693 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host); 1694 } 1695 1696 static int __init scsi_debug_init(void) 1697 { 1698 unsigned long sz; 1699 int host_to_add; 1700 int k; 1701 1702 if (scsi_debug_dev_size_mb < 1) 1703 scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */ 1704 sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576; 1705 sdebug_capacity = sdebug_store_size / SECT_SIZE; 1706 1707 /* play around with geometry, don't waste too much on track 0 */ 1708 sdebug_heads = 8; 1709 sdebug_sectors_per = 32; 1710 if (scsi_debug_dev_size_mb >= 16) 1711 sdebug_heads = 32; 1712 else if (scsi_debug_dev_size_mb >= 256) 1713 sdebug_heads = 64; 1714 sdebug_cylinders_per = (unsigned long)sdebug_capacity / 1715 (sdebug_sectors_per * sdebug_heads); 1716 if (sdebug_cylinders_per >= 1024) { 1717 /* other LLDs do this; implies >= 1GB ram disk ... */ 1718 sdebug_heads = 255; 1719 sdebug_sectors_per = 63; 1720 sdebug_cylinders_per = (unsigned long)sdebug_capacity / 1721 (sdebug_sectors_per * sdebug_heads); 1722 } 1723 1724 sz = sdebug_store_size; 1725 fake_storep = vmalloc(sz); 1726 if (NULL == fake_storep) { 1727 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n"); 1728 return -ENOMEM; 1729 } 1730 memset(fake_storep, 0, sz); 1731 if (scsi_debug_num_parts > 0) 1732 sdebug_build_parts(fake_storep); 1733 1734 init_all_queued(); 1735 1736 device_register(&pseudo_primary); 1737 bus_register(&pseudo_lld_bus); 1738 driver_register(&sdebug_driverfs_driver); 1739 do_create_driverfs_files(); 1740 1741 sdebug_driver_template.proc_name = (char *)sdebug_proc_name; 1742 1743 host_to_add = scsi_debug_add_host; 1744 scsi_debug_add_host = 0; 1745 1746 for (k = 0; k < host_to_add; k++) { 1747 if (sdebug_add_adapter()) { 1748 printk(KERN_ERR "scsi_debug_init: " 1749 "sdebug_add_adapter failed k=%d\n", k); 1750 break; 1751 } 1752 } 1753 1754 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { 1755 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n", 1756 scsi_debug_add_host); 1757 } 1758 return 0; 1759 } 1760 1761 static void __exit scsi_debug_exit(void) 1762 { 1763 int k = scsi_debug_add_host; 1764 1765 stop_all_queued(); 1766 for (; k; k--) 1767 sdebug_remove_adapter(); 1768 do_remove_driverfs_files(); 1769 driver_unregister(&sdebug_driverfs_driver); 1770 bus_unregister(&pseudo_lld_bus); 1771 device_unregister(&pseudo_primary); 1772 1773 vfree(fake_storep); 1774 } 1775 1776 device_initcall(scsi_debug_init); 1777 module_exit(scsi_debug_exit); 1778 1779 static void pseudo_0_release(struct device * dev) 1780 { 1781 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1782 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n"); 1783 } 1784 1785 static struct device pseudo_primary = { 1786 .bus_id = "pseudo_0", 1787 .release = pseudo_0_release, 1788 }; 1789 1790 static int pseudo_lld_bus_match(struct device *dev, 1791 struct device_driver *dev_driver) 1792 { 1793 return 1; 1794 } 1795 1796 static struct bus_type pseudo_lld_bus = { 1797 .name = "pseudo", 1798 .match = pseudo_lld_bus_match, 1799 }; 1800 1801 static void sdebug_release_adapter(struct device * dev) 1802 { 1803 struct sdebug_host_info *sdbg_host; 1804 1805 sdbg_host = to_sdebug_host(dev); 1806 kfree(sdbg_host); 1807 } 1808 1809 static int sdebug_add_adapter(void) 1810 { 1811 int k, devs_per_host; 1812 int error = 0; 1813 struct sdebug_host_info *sdbg_host; 1814 struct sdebug_dev_info *sdbg_devinfo; 1815 struct list_head *lh, *lh_sf; 1816 1817 sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL); 1818 1819 if (NULL == sdbg_host) { 1820 printk(KERN_ERR "%s: out of memory at line %d\n", 1821 __FUNCTION__, __LINE__); 1822 return -ENOMEM; 1823 } 1824 1825 memset(sdbg_host, 0, sizeof(*sdbg_host)); 1826 INIT_LIST_HEAD(&sdbg_host->dev_info_list); 1827 1828 devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns; 1829 for (k = 0; k < devs_per_host; k++) { 1830 sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL); 1831 if (NULL == sdbg_devinfo) { 1832 printk(KERN_ERR "%s: out of memory at line %d\n", 1833 __FUNCTION__, __LINE__); 1834 error = -ENOMEM; 1835 goto clean; 1836 } 1837 memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo)); 1838 sdbg_devinfo->sdbg_host = sdbg_host; 1839 list_add_tail(&sdbg_devinfo->dev_list, 1840 &sdbg_host->dev_info_list); 1841 } 1842 1843 spin_lock(&sdebug_host_list_lock); 1844 list_add_tail(&sdbg_host->host_list, &sdebug_host_list); 1845 spin_unlock(&sdebug_host_list_lock); 1846 1847 sdbg_host->dev.bus = &pseudo_lld_bus; 1848 sdbg_host->dev.parent = &pseudo_primary; 1849 sdbg_host->dev.release = &sdebug_release_adapter; 1850 sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host); 1851 1852 error = device_register(&sdbg_host->dev); 1853 1854 if (error) 1855 goto clean; 1856 1857 ++scsi_debug_add_host; 1858 return error; 1859 1860 clean: 1861 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { 1862 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, 1863 dev_list); 1864 list_del(&sdbg_devinfo->dev_list); 1865 kfree(sdbg_devinfo); 1866 } 1867 1868 kfree(sdbg_host); 1869 return error; 1870 } 1871 1872 static void sdebug_remove_adapter(void) 1873 { 1874 struct sdebug_host_info * sdbg_host = NULL; 1875 1876 spin_lock(&sdebug_host_list_lock); 1877 if (!list_empty(&sdebug_host_list)) { 1878 sdbg_host = list_entry(sdebug_host_list.prev, 1879 struct sdebug_host_info, host_list); 1880 list_del(&sdbg_host->host_list); 1881 } 1882 spin_unlock(&sdebug_host_list_lock); 1883 1884 if (!sdbg_host) 1885 return; 1886 1887 device_unregister(&sdbg_host->dev); 1888 --scsi_debug_add_host; 1889 } 1890 1891 static int sdebug_driver_probe(struct device * dev) 1892 { 1893 int error = 0; 1894 struct sdebug_host_info *sdbg_host; 1895 struct Scsi_Host *hpnt; 1896 1897 sdbg_host = to_sdebug_host(dev); 1898 1899 hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); 1900 if (NULL == hpnt) { 1901 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__); 1902 error = -ENODEV; 1903 return error; 1904 } 1905 1906 sdbg_host->shost = hpnt; 1907 *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; 1908 if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id)) 1909 hpnt->max_id = scsi_debug_num_tgts + 1; 1910 else 1911 hpnt->max_id = scsi_debug_num_tgts; 1912 hpnt->max_lun = scsi_debug_max_luns; 1913 1914 error = scsi_add_host(hpnt, &sdbg_host->dev); 1915 if (error) { 1916 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__); 1917 error = -ENODEV; 1918 scsi_host_put(hpnt); 1919 } else 1920 scsi_scan_host(hpnt); 1921 1922 1923 return error; 1924 } 1925 1926 static int sdebug_driver_remove(struct device * dev) 1927 { 1928 struct list_head *lh, *lh_sf; 1929 struct sdebug_host_info *sdbg_host; 1930 struct sdebug_dev_info *sdbg_devinfo; 1931 1932 sdbg_host = to_sdebug_host(dev); 1933 1934 if (!sdbg_host) { 1935 printk(KERN_ERR "%s: Unable to locate host info\n", 1936 __FUNCTION__); 1937 return -ENODEV; 1938 } 1939 1940 scsi_remove_host(sdbg_host->shost); 1941 1942 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { 1943 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, 1944 dev_list); 1945 list_del(&sdbg_devinfo->dev_list); 1946 kfree(sdbg_devinfo); 1947 } 1948 1949 scsi_host_put(sdbg_host->shost); 1950 return 0; 1951 } 1952 1953 static void sdebug_max_tgts_luns(void) 1954 { 1955 struct sdebug_host_info * sdbg_host; 1956 struct Scsi_Host *hpnt; 1957 1958 spin_lock(&sdebug_host_list_lock); 1959 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { 1960 hpnt = sdbg_host->shost; 1961 if ((hpnt->this_id >= 0) && 1962 (scsi_debug_num_tgts > hpnt->this_id)) 1963 hpnt->max_id = scsi_debug_num_tgts + 1; 1964 else 1965 hpnt->max_id = scsi_debug_num_tgts; 1966 hpnt->max_lun = scsi_debug_max_luns; 1967 } 1968 spin_unlock(&sdebug_host_list_lock); 1969 } 1970