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 #ifndef LINUX_VERSION_CODE 52 #include <linux/version.h> 53 #endif 54 55 #include "scsi_logging.h" 56 #include "scsi_debug.h" 57 58 #define SCSI_DEBUG_VERSION "1.75" 59 static const char * scsi_debug_version_date = "20050113"; 60 61 /* Additional Sense Code (ASC) used */ 62 #define NO_ADDED_SENSE 0x0 63 #define UNRECOVERED_READ_ERR 0x11 64 #define INVALID_OPCODE 0x20 65 #define ADDR_OUT_OF_RANGE 0x21 66 #define INVALID_FIELD_IN_CDB 0x24 67 #define POWERON_RESET 0x29 68 #define SAVING_PARAMS_UNSUP 0x39 69 #define THRESHHOLD_EXCEEDED 0x5d 70 71 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */ 72 73 /* Default values for driver parameters */ 74 #define DEF_NUM_HOST 1 75 #define DEF_NUM_TGTS 1 76 #define DEF_MAX_LUNS 1 77 /* With these defaults, this driver will make 1 host with 1 target 78 * (id 0) containing 1 logical unit (lun 0). That is 1 device. 79 */ 80 #define DEF_DELAY 1 81 #define DEF_DEV_SIZE_MB 8 82 #define DEF_EVERY_NTH 0 83 #define DEF_NUM_PARTS 0 84 #define DEF_OPTS 0 85 #define DEF_SCSI_LEVEL 5 /* INQUIRY, byte2 [5->SPC-3] */ 86 #define DEF_PTYPE 0 87 #define DEF_D_SENSE 0 88 89 /* bit mask values for scsi_debug_opts */ 90 #define SCSI_DEBUG_OPT_NOISE 1 91 #define SCSI_DEBUG_OPT_MEDIUM_ERR 2 92 #define SCSI_DEBUG_OPT_TIMEOUT 4 93 #define SCSI_DEBUG_OPT_RECOVERED_ERR 8 94 /* When "every_nth" > 0 then modulo "every_nth" commands: 95 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set 96 * - a RECOVERED_ERROR is simulated on successful read and write 97 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. 98 * 99 * When "every_nth" < 0 then after "- every_nth" commands: 100 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set 101 * - a RECOVERED_ERROR is simulated on successful read and write 102 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. 103 * This will continue until some other action occurs (e.g. the user 104 * writing a new value (other than -1 or 1) to every_nth via sysfs). 105 */ 106 107 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this 108 * sector on read commands: */ 109 #define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ 110 111 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) 112 * or "peripheral device" addressing (value 0) */ 113 #define SAM2_LUN_ADDRESS_METHOD 0 114 115 static int scsi_debug_add_host = DEF_NUM_HOST; 116 static int scsi_debug_delay = DEF_DELAY; 117 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB; 118 static int scsi_debug_every_nth = DEF_EVERY_NTH; 119 static int scsi_debug_max_luns = DEF_MAX_LUNS; 120 static int scsi_debug_num_parts = DEF_NUM_PARTS; 121 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */ 122 static int scsi_debug_opts = DEF_OPTS; 123 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL; 124 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */ 125 static int scsi_debug_dsense = DEF_D_SENSE; 126 127 static int scsi_debug_cmnd_count = 0; 128 129 #define DEV_READONLY(TGT) (0) 130 #define DEV_REMOVEABLE(TGT) (0) 131 132 static unsigned long sdebug_store_size; /* in bytes */ 133 static sector_t sdebug_capacity; /* in sectors */ 134 135 /* old BIOS stuff, kernel may get rid of them but some mode sense pages 136 may still need them */ 137 static int sdebug_heads; /* heads per disk */ 138 static int sdebug_cylinders_per; /* cylinders per surface */ 139 static int sdebug_sectors_per; /* sectors per cylinder */ 140 141 /* default sector size is 512 bytes, 2**9 bytes */ 142 #define POW2_SECT_SIZE 9 143 #define SECT_SIZE (1 << POW2_SECT_SIZE) 144 #define SECT_SIZE_PER(TGT) SECT_SIZE 145 146 #define SDEBUG_MAX_PARTS 4 147 148 #define SDEBUG_SENSE_LEN 32 149 150 struct sdebug_dev_info { 151 struct list_head dev_list; 152 unsigned char sense_buff[SDEBUG_SENSE_LEN]; /* weak nexus */ 153 unsigned int channel; 154 unsigned int target; 155 unsigned int lun; 156 struct sdebug_host_info *sdbg_host; 157 char reset; 158 char used; 159 }; 160 161 struct sdebug_host_info { 162 struct list_head host_list; 163 struct Scsi_Host *shost; 164 struct device dev; 165 struct list_head dev_info_list; 166 }; 167 168 #define to_sdebug_host(d) \ 169 container_of(d, struct sdebug_host_info, dev) 170 171 static LIST_HEAD(sdebug_host_list); 172 static DEFINE_SPINLOCK(sdebug_host_list_lock); 173 174 typedef void (* done_funct_t) (struct scsi_cmnd *); 175 176 struct sdebug_queued_cmd { 177 int in_use; 178 struct timer_list cmnd_timer; 179 done_funct_t done_funct; 180 struct scsi_cmnd * a_cmnd; 181 int scsi_result; 182 }; 183 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE]; 184 185 static Scsi_Host_Template sdebug_driver_template = { 186 .proc_info = scsi_debug_proc_info, 187 .name = "SCSI DEBUG", 188 .info = scsi_debug_info, 189 .slave_alloc = scsi_debug_slave_alloc, 190 .slave_configure = scsi_debug_slave_configure, 191 .slave_destroy = scsi_debug_slave_destroy, 192 .ioctl = scsi_debug_ioctl, 193 .queuecommand = scsi_debug_queuecommand, 194 .eh_abort_handler = scsi_debug_abort, 195 .eh_bus_reset_handler = scsi_debug_bus_reset, 196 .eh_device_reset_handler = scsi_debug_device_reset, 197 .eh_host_reset_handler = scsi_debug_host_reset, 198 .bios_param = scsi_debug_biosparam, 199 .can_queue = SCSI_DEBUG_CANQUEUE, 200 .this_id = 7, 201 .sg_tablesize = 64, 202 .cmd_per_lun = 3, 203 .max_sectors = 4096, 204 .unchecked_isa_dma = 0, 205 .use_clustering = DISABLE_CLUSTERING, 206 .module = THIS_MODULE, 207 }; 208 209 static unsigned char * fake_storep; /* ramdisk storage */ 210 211 static int num_aborts = 0; 212 static int num_dev_resets = 0; 213 static int num_bus_resets = 0; 214 static int num_host_resets = 0; 215 216 static DEFINE_SPINLOCK(queued_arr_lock); 217 static DEFINE_RWLOCK(atomic_rw); 218 219 static char sdebug_proc_name[] = "scsi_debug"; 220 221 static int sdebug_driver_probe(struct device *); 222 static int sdebug_driver_remove(struct device *); 223 static struct bus_type pseudo_lld_bus; 224 225 static struct device_driver sdebug_driverfs_driver = { 226 .name = sdebug_proc_name, 227 .bus = &pseudo_lld_bus, 228 .probe = sdebug_driver_probe, 229 .remove = sdebug_driver_remove, 230 }; 231 232 static const int check_condition_result = 233 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 234 235 /* function declarations */ 236 static int resp_inquiry(struct scsi_cmnd * SCpnt, int target, 237 struct sdebug_dev_info * devip); 238 static int resp_requests(struct scsi_cmnd * SCpnt, 239 struct sdebug_dev_info * devip); 240 static int resp_readcap(struct scsi_cmnd * SCpnt, 241 struct sdebug_dev_info * devip); 242 static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target, 243 struct sdebug_dev_info * devip); 244 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, 245 int num, struct sdebug_dev_info * devip); 246 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, 247 int num, struct sdebug_dev_info * devip); 248 static int resp_report_luns(struct scsi_cmnd * SCpnt, 249 struct sdebug_dev_info * devip); 250 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 251 int arr_len); 252 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 253 int max_arr_len); 254 static void timer_intr_handler(unsigned long); 255 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev); 256 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, 257 int asc, int asq); 258 static int check_reset(struct scsi_cmnd * SCpnt, 259 struct sdebug_dev_info * devip); 260 static int schedule_resp(struct scsi_cmnd * cmnd, 261 struct sdebug_dev_info * devip, 262 done_funct_t done, int scsi_result, int delta_jiff); 263 static void __init sdebug_build_parts(unsigned char * ramp); 264 static void __init init_all_queued(void); 265 static void stop_all_queued(void); 266 static int stop_queued_cmnd(struct scsi_cmnd * cmnd); 267 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, 268 const char * dev_id_str, int dev_id_str_len); 269 static void do_create_driverfs_files(void); 270 static void do_remove_driverfs_files(void); 271 272 static int sdebug_add_adapter(void); 273 static void sdebug_remove_adapter(void); 274 static void sdebug_max_tgts_luns(void); 275 276 static struct device pseudo_primary; 277 static struct bus_type pseudo_lld_bus; 278 279 280 static 281 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done) 282 { 283 unsigned char *cmd = (unsigned char *) SCpnt->cmnd; 284 int block, upper_blk, num, k; 285 int errsts = 0; 286 int target = SCpnt->device->id; 287 struct sdebug_dev_info * devip = NULL; 288 int inj_recovered = 0; 289 290 if (done == NULL) 291 return 0; /* assume mid level reprocessing command */ 292 293 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) { 294 printk(KERN_INFO "scsi_debug: cmd "); 295 for (k = 0, num = SCpnt->cmd_len; k < num; ++k) 296 printk("%02x ", (int)cmd[k]); 297 printk("\n"); 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 >= abs(scsi_debug_every_nth))) { 316 scsi_debug_cmnd_count = 0; 317 if (scsi_debug_every_nth < -1) 318 scsi_debug_every_nth = -1; 319 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts) 320 return 0; /* ignore command causing timeout */ 321 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts) 322 inj_recovered = 1; /* to reads and writes below */ 323 } 324 325 switch (*cmd) { 326 case INQUIRY: /* mandatory, ignore unit attention */ 327 errsts = resp_inquiry(SCpnt, target, devip); 328 break; 329 case REQUEST_SENSE: /* mandatory, ignore unit attention */ 330 errsts = resp_requests(SCpnt, devip); 331 break; 332 case REZERO_UNIT: /* actually this is REWIND for SSC */ 333 case START_STOP: 334 errsts = check_reset(SCpnt, devip); 335 break; 336 case ALLOW_MEDIUM_REMOVAL: 337 if ((errsts = check_reset(SCpnt, devip))) 338 break; 339 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 340 printk(KERN_INFO "scsi_debug: Medium removal %s\n", 341 cmd[4] ? "inhibited" : "enabled"); 342 break; 343 case SEND_DIAGNOSTIC: /* mandatory */ 344 errsts = check_reset(SCpnt, devip); 345 break; 346 case TEST_UNIT_READY: /* mandatory */ 347 errsts = check_reset(SCpnt, devip); 348 break; 349 case RESERVE: 350 errsts = check_reset(SCpnt, devip); 351 break; 352 case RESERVE_10: 353 errsts = check_reset(SCpnt, devip); 354 break; 355 case RELEASE: 356 errsts = check_reset(SCpnt, devip); 357 break; 358 case RELEASE_10: 359 errsts = check_reset(SCpnt, devip); 360 break; 361 case READ_CAPACITY: 362 errsts = resp_readcap(SCpnt, devip); 363 break; 364 case READ_16: 365 case READ_12: 366 case READ_10: 367 case READ_6: 368 if ((errsts = check_reset(SCpnt, devip))) 369 break; 370 upper_blk = 0; 371 if ((*cmd) == READ_16) { 372 upper_blk = cmd[5] + (cmd[4] << 8) + 373 (cmd[3] << 16) + (cmd[2] << 24); 374 block = cmd[9] + (cmd[8] << 8) + 375 (cmd[7] << 16) + (cmd[6] << 24); 376 num = cmd[13] + (cmd[12] << 8) + 377 (cmd[11] << 16) + (cmd[10] << 24); 378 } else if ((*cmd) == READ_12) { 379 block = cmd[5] + (cmd[4] << 8) + 380 (cmd[3] << 16) + (cmd[2] << 24); 381 num = cmd[9] + (cmd[8] << 8) + 382 (cmd[7] << 16) + (cmd[6] << 24); 383 } else if ((*cmd) == READ_10) { 384 block = cmd[5] + (cmd[4] << 8) + 385 (cmd[3] << 16) + (cmd[2] << 24); 386 num = cmd[8] + (cmd[7] << 8); 387 } else { 388 block = cmd[3] + (cmd[2] << 8) + 389 ((cmd[1] & 0x1f) << 16); 390 num = cmd[4]; 391 } 392 errsts = resp_read(SCpnt, upper_blk, block, num, devip); 393 if (inj_recovered && (0 == errsts)) { 394 mk_sense_buffer(devip, RECOVERED_ERROR, 395 THRESHHOLD_EXCEEDED, 0); 396 errsts = check_condition_result; 397 } 398 break; 399 case REPORT_LUNS: /* mandatory, ignore unit attention */ 400 errsts = resp_report_luns(SCpnt, devip); 401 break; 402 case VERIFY: /* 10 byte SBC-2 command */ 403 errsts = check_reset(SCpnt, devip); 404 break; 405 case WRITE_16: 406 case WRITE_12: 407 case WRITE_10: 408 case WRITE_6: 409 if ((errsts = check_reset(SCpnt, devip))) 410 break; 411 upper_blk = 0; 412 if ((*cmd) == WRITE_16) { 413 upper_blk = cmd[5] + (cmd[4] << 8) + 414 (cmd[3] << 16) + (cmd[2] << 24); 415 block = cmd[9] + (cmd[8] << 8) + 416 (cmd[7] << 16) + (cmd[6] << 24); 417 num = cmd[13] + (cmd[12] << 8) + 418 (cmd[11] << 16) + (cmd[10] << 24); 419 } else if ((*cmd) == WRITE_12) { 420 block = cmd[5] + (cmd[4] << 8) + 421 (cmd[3] << 16) + (cmd[2] << 24); 422 num = cmd[9] + (cmd[8] << 8) + 423 (cmd[7] << 16) + (cmd[6] << 24); 424 } else if ((*cmd) == WRITE_10) { 425 block = cmd[5] + (cmd[4] << 8) + 426 (cmd[3] << 16) + (cmd[2] << 24); 427 num = cmd[8] + (cmd[7] << 8); 428 } else { 429 block = cmd[3] + (cmd[2] << 8) + 430 ((cmd[1] & 0x1f) << 16); 431 num = cmd[4]; 432 } 433 errsts = resp_write(SCpnt, upper_blk, block, num, devip); 434 if (inj_recovered && (0 == errsts)) { 435 mk_sense_buffer(devip, RECOVERED_ERROR, 436 THRESHHOLD_EXCEEDED, 0); 437 errsts = check_condition_result; 438 } 439 break; 440 case MODE_SENSE: 441 case MODE_SENSE_10: 442 errsts = resp_mode_sense(SCpnt, target, devip); 443 break; 444 case SYNCHRONIZE_CACHE: 445 errsts = check_reset(SCpnt, devip); 446 break; 447 default: 448 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 449 printk(KERN_INFO "scsi_debug: Opcode: 0x%x not " 450 "supported\n", *cmd); 451 if ((errsts = check_reset(SCpnt, devip))) 452 break; /* Unit attention takes precedence */ 453 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0); 454 errsts = check_condition_result; 455 break; 456 } 457 return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay); 458 } 459 460 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) 461 { 462 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { 463 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd); 464 } 465 return -EINVAL; 466 /* return -ENOTTY; // correct return but upsets fdisk */ 467 } 468 469 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip) 470 { 471 if (devip->reset) { 472 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 473 printk(KERN_INFO "scsi_debug: Reporting Unit " 474 "attention: power on reset\n"); 475 devip->reset = 0; 476 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0); 477 return check_condition_result; 478 } 479 return 0; 480 } 481 482 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */ 483 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 484 int arr_len) 485 { 486 int k, req_len, act_len, len, active; 487 void * kaddr; 488 void * kaddr_off; 489 struct scatterlist * sgpnt; 490 491 if (0 == scp->request_bufflen) 492 return 0; 493 if (NULL == scp->request_buffer) 494 return (DID_ERROR << 16); 495 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || 496 (scp->sc_data_direction == DMA_FROM_DEVICE))) 497 return (DID_ERROR << 16); 498 if (0 == scp->use_sg) { 499 req_len = scp->request_bufflen; 500 act_len = (req_len < arr_len) ? req_len : arr_len; 501 memcpy(scp->request_buffer, arr, act_len); 502 scp->resid = req_len - act_len; 503 return 0; 504 } 505 sgpnt = (struct scatterlist *)scp->request_buffer; 506 active = 1; 507 for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) { 508 if (active) { 509 kaddr = (unsigned char *) 510 kmap_atomic(sgpnt->page, KM_USER0); 511 if (NULL == kaddr) 512 return (DID_ERROR << 16); 513 kaddr_off = (unsigned char *)kaddr + sgpnt->offset; 514 len = sgpnt->length; 515 if ((req_len + len) > arr_len) { 516 active = 0; 517 len = arr_len - req_len; 518 } 519 memcpy(kaddr_off, arr + req_len, len); 520 kunmap_atomic(kaddr, KM_USER0); 521 act_len += len; 522 } 523 req_len += sgpnt->length; 524 } 525 scp->resid = req_len - act_len; 526 return 0; 527 } 528 529 /* Returns number of bytes fetched into 'arr' or -1 if error. */ 530 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, 531 int max_arr_len) 532 { 533 int k, req_len, len, fin; 534 void * kaddr; 535 void * kaddr_off; 536 struct scatterlist * sgpnt; 537 538 if (0 == scp->request_bufflen) 539 return 0; 540 if (NULL == scp->request_buffer) 541 return -1; 542 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || 543 (scp->sc_data_direction == DMA_TO_DEVICE))) 544 return -1; 545 if (0 == scp->use_sg) { 546 req_len = scp->request_bufflen; 547 len = (req_len < max_arr_len) ? req_len : max_arr_len; 548 memcpy(arr, scp->request_buffer, len); 549 return len; 550 } 551 sgpnt = (struct scatterlist *)scp->request_buffer; 552 for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) { 553 kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0); 554 if (NULL == kaddr) 555 return -1; 556 kaddr_off = (unsigned char *)kaddr + sgpnt->offset; 557 len = sgpnt->length; 558 if ((req_len + len) > max_arr_len) { 559 len = max_arr_len - req_len; 560 fin = 1; 561 } 562 memcpy(arr + req_len, kaddr_off, len); 563 kunmap_atomic(kaddr, KM_USER0); 564 if (fin) 565 return req_len + len; 566 req_len += sgpnt->length; 567 } 568 return req_len; 569 } 570 571 572 static const char * inq_vendor_id = "Linux "; 573 static const char * inq_product_id = "scsi_debug "; 574 static const char * inq_product_rev = "0004"; 575 576 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, 577 const char * dev_id_str, int dev_id_str_len) 578 { 579 int num; 580 581 /* Two identification descriptors: */ 582 /* T10 vendor identifier field format (faked) */ 583 arr[0] = 0x2; /* ASCII */ 584 arr[1] = 0x1; 585 arr[2] = 0x0; 586 memcpy(&arr[4], inq_vendor_id, 8); 587 memcpy(&arr[12], inq_product_id, 16); 588 memcpy(&arr[28], dev_id_str, dev_id_str_len); 589 num = 8 + 16 + dev_id_str_len; 590 arr[3] = num; 591 num += 4; 592 /* NAA IEEE registered identifier (faked) */ 593 arr[num] = 0x1; /* binary */ 594 arr[num + 1] = 0x3; 595 arr[num + 2] = 0x0; 596 arr[num + 3] = 0x8; 597 arr[num + 4] = 0x51; /* ieee company id=0x123456 (faked) */ 598 arr[num + 5] = 0x23; 599 arr[num + 6] = 0x45; 600 arr[num + 7] = 0x60; 601 arr[num + 8] = (dev_id_num >> 24); 602 arr[num + 9] = (dev_id_num >> 16) & 0xff; 603 arr[num + 10] = (dev_id_num >> 8) & 0xff; 604 arr[num + 11] = dev_id_num & 0xff; 605 return num + 12; 606 } 607 608 609 #define SDEBUG_LONG_INQ_SZ 96 610 #define SDEBUG_MAX_INQ_ARR_SZ 128 611 612 static int resp_inquiry(struct scsi_cmnd * scp, int target, 613 struct sdebug_dev_info * devip) 614 { 615 unsigned char pq_pdt; 616 unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ]; 617 unsigned char *cmd = (unsigned char *)scp->cmnd; 618 int alloc_len; 619 620 alloc_len = (cmd[3] << 8) + cmd[4]; 621 memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ); 622 pq_pdt = (scsi_debug_ptype & 0x1f); 623 arr[0] = pq_pdt; 624 if (0x2 & cmd[1]) { /* CMDDT bit set */ 625 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 626 0); 627 return check_condition_result; 628 } else if (0x1 & cmd[1]) { /* EVPD bit set */ 629 int dev_id_num, len; 630 char dev_id_str[6]; 631 632 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) + 633 (devip->target * 1000) + devip->lun; 634 len = scnprintf(dev_id_str, 6, "%d", dev_id_num); 635 if (0 == cmd[2]) { /* supported vital product data pages */ 636 arr[3] = 3; 637 arr[4] = 0x0; /* this page */ 638 arr[5] = 0x80; /* unit serial number */ 639 arr[6] = 0x83; /* device identification */ 640 } else if (0x80 == cmd[2]) { /* unit serial number */ 641 arr[1] = 0x80; 642 arr[3] = len; 643 memcpy(&arr[4], dev_id_str, len); 644 } else if (0x83 == cmd[2]) { /* device identification */ 645 arr[1] = 0x83; 646 arr[3] = inquiry_evpd_83(&arr[4], dev_id_num, 647 dev_id_str, len); 648 } else { 649 /* Illegal request, invalid field in cdb */ 650 mk_sense_buffer(devip, ILLEGAL_REQUEST, 651 INVALID_FIELD_IN_CDB, 0); 652 return check_condition_result; 653 } 654 return fill_from_dev_buffer(scp, arr, 655 min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ)); 656 } 657 /* drops through here for a standard inquiry */ 658 arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0; /* Removable disk */ 659 arr[2] = scsi_debug_scsi_level; 660 arr[3] = 2; /* response_data_format==2 */ 661 arr[4] = SDEBUG_LONG_INQ_SZ - 5; 662 arr[6] = 0x1; /* claim: ADDR16 */ 663 /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */ 664 arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */ 665 memcpy(&arr[8], inq_vendor_id, 8); 666 memcpy(&arr[16], inq_product_id, 16); 667 memcpy(&arr[32], inq_product_rev, 4); 668 /* version descriptors (2 bytes each) follow */ 669 arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */ 670 arr[60] = 0x3; arr[61] = 0x0; /* SPC-3 */ 671 if (scsi_debug_ptype == 0) { 672 arr[62] = 0x1; arr[63] = 0x80; /* SBC */ 673 } else if (scsi_debug_ptype == 1) { 674 arr[62] = 0x2; arr[63] = 0x00; /* SSC */ 675 } 676 return fill_from_dev_buffer(scp, arr, 677 min(alloc_len, SDEBUG_LONG_INQ_SZ)); 678 } 679 680 static int resp_requests(struct scsi_cmnd * scp, 681 struct sdebug_dev_info * devip) 682 { 683 unsigned char * sbuff; 684 unsigned char *cmd = (unsigned char *)scp->cmnd; 685 unsigned char arr[SDEBUG_SENSE_LEN]; 686 int len = 18; 687 688 memset(arr, 0, SDEBUG_SENSE_LEN); 689 if (devip->reset == 1) 690 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); 691 sbuff = devip->sense_buff; 692 if ((cmd[1] & 1) && (! scsi_debug_dsense)) { 693 /* DESC bit set and sense_buff in fixed format */ 694 arr[0] = 0x72; 695 arr[1] = sbuff[2]; /* sense key */ 696 arr[2] = sbuff[12]; /* asc */ 697 arr[3] = sbuff[13]; /* ascq */ 698 len = 8; 699 } else 700 memcpy(arr, sbuff, SDEBUG_SENSE_LEN); 701 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); 702 return fill_from_dev_buffer(scp, arr, len); 703 } 704 705 #define SDEBUG_READCAP_ARR_SZ 8 706 static int resp_readcap(struct scsi_cmnd * scp, 707 struct sdebug_dev_info * devip) 708 { 709 unsigned char arr[SDEBUG_READCAP_ARR_SZ]; 710 unsigned long capac; 711 int errsts; 712 713 if ((errsts = check_reset(scp, devip))) 714 return errsts; 715 memset(arr, 0, SDEBUG_READCAP_ARR_SZ); 716 capac = (unsigned long)sdebug_capacity - 1; 717 arr[0] = (capac >> 24); 718 arr[1] = (capac >> 16) & 0xff; 719 arr[2] = (capac >> 8) & 0xff; 720 arr[3] = capac & 0xff; 721 arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff; 722 arr[7] = SECT_SIZE_PER(target) & 0xff; 723 return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ); 724 } 725 726 /* <<Following mode page info copied from ST318451LW>> */ 727 728 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target) 729 { /* Read-Write Error Recovery page for mode_sense */ 730 unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0, 731 5, 0, 0xff, 0xff}; 732 733 memcpy(p, err_recov_pg, sizeof(err_recov_pg)); 734 if (1 == pcontrol) 735 memset(p + 2, 0, sizeof(err_recov_pg) - 2); 736 return sizeof(err_recov_pg); 737 } 738 739 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target) 740 { /* Disconnect-Reconnect page for mode_sense */ 741 unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0, 742 0, 0, 0, 0, 0, 0, 0, 0}; 743 744 memcpy(p, disconnect_pg, sizeof(disconnect_pg)); 745 if (1 == pcontrol) 746 memset(p + 2, 0, sizeof(disconnect_pg) - 2); 747 return sizeof(disconnect_pg); 748 } 749 750 static int resp_format_pg(unsigned char * p, int pcontrol, int target) 751 { /* Format device page for mode_sense */ 752 unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0, 753 0, 0, 0, 0, 0, 0, 0, 0, 754 0, 0, 0, 0, 0x40, 0, 0, 0}; 755 756 memcpy(p, format_pg, sizeof(format_pg)); 757 p[10] = (sdebug_sectors_per >> 8) & 0xff; 758 p[11] = sdebug_sectors_per & 0xff; 759 p[12] = (SECT_SIZE >> 8) & 0xff; 760 p[13] = SECT_SIZE & 0xff; 761 if (DEV_REMOVEABLE(target)) 762 p[20] |= 0x20; /* should agree with INQUIRY */ 763 if (1 == pcontrol) 764 memset(p + 2, 0, sizeof(format_pg) - 2); 765 return sizeof(format_pg); 766 } 767 768 static int resp_caching_pg(unsigned char * p, int pcontrol, int target) 769 { /* Caching page for mode_sense */ 770 unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, 771 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0}; 772 773 memcpy(p, caching_pg, sizeof(caching_pg)); 774 if (1 == pcontrol) 775 memset(p + 2, 0, sizeof(caching_pg) - 2); 776 return sizeof(caching_pg); 777 } 778 779 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target) 780 { /* Control mode page for mode_sense */ 781 unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, 782 0, 0, 0x2, 0x4b}; 783 784 if (scsi_debug_dsense) 785 ctrl_m_pg[2] |= 0x4; 786 memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg)); 787 if (1 == pcontrol) 788 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2); 789 return sizeof(ctrl_m_pg); 790 } 791 792 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target) 793 { /* Informational Exceptions control mode page for mode_sense */ 794 unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, 795 0, 0, 0x0, 0x0}; 796 memcpy(p, iec_m_pg, sizeof(iec_m_pg)); 797 if (1 == pcontrol) 798 memset(p + 2, 0, sizeof(iec_m_pg) - 2); 799 return sizeof(iec_m_pg); 800 } 801 802 #define SDEBUG_MAX_MSENSE_SZ 256 803 804 static int resp_mode_sense(struct scsi_cmnd * scp, int target, 805 struct sdebug_dev_info * devip) 806 { 807 unsigned char dbd; 808 int pcontrol, pcode, subpcode; 809 unsigned char dev_spec; 810 int alloc_len, msense_6, offset, len, errsts; 811 unsigned char * ap; 812 unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; 813 unsigned char *cmd = (unsigned char *)scp->cmnd; 814 815 if ((errsts = check_reset(scp, devip))) 816 return errsts; 817 dbd = cmd[1] & 0x8; 818 pcontrol = (cmd[2] & 0xc0) >> 6; 819 pcode = cmd[2] & 0x3f; 820 subpcode = cmd[3]; 821 msense_6 = (MODE_SENSE == cmd[0]); 822 alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]); 823 memset(arr, 0, SDEBUG_MAX_MSENSE_SZ); 824 if (0x3 == pcontrol) { /* Saving values not supported */ 825 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 826 0); 827 return check_condition_result; 828 } 829 dev_spec = DEV_READONLY(target) ? 0x80 : 0x0; 830 if (msense_6) { 831 arr[2] = dev_spec; 832 offset = 4; 833 } else { 834 arr[3] = dev_spec; 835 offset = 8; 836 } 837 ap = arr + offset; 838 839 if (0 != subpcode) { /* TODO: Control Extension page */ 840 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 841 0); 842 return check_condition_result; 843 } 844 switch (pcode) { 845 case 0x1: /* Read-Write error recovery page, direct access */ 846 len = resp_err_recov_pg(ap, pcontrol, target); 847 offset += len; 848 break; 849 case 0x2: /* Disconnect-Reconnect page, all devices */ 850 len = resp_disconnect_pg(ap, pcontrol, target); 851 offset += len; 852 break; 853 case 0x3: /* Format device page, direct access */ 854 len = resp_format_pg(ap, pcontrol, target); 855 offset += len; 856 break; 857 case 0x8: /* Caching page, direct access */ 858 len = resp_caching_pg(ap, pcontrol, target); 859 offset += len; 860 break; 861 case 0xa: /* Control Mode page, all devices */ 862 len = resp_ctrl_m_pg(ap, pcontrol, target); 863 offset += len; 864 break; 865 case 0x1c: /* Informational Exceptions Mode page, all devices */ 866 len = resp_iec_m_pg(ap, pcontrol, target); 867 offset += len; 868 break; 869 case 0x3f: /* Read all Mode pages */ 870 len = resp_err_recov_pg(ap, pcontrol, target); 871 len += resp_disconnect_pg(ap + len, pcontrol, target); 872 len += resp_format_pg(ap + len, pcontrol, target); 873 len += resp_caching_pg(ap + len, pcontrol, target); 874 len += resp_ctrl_m_pg(ap + len, pcontrol, target); 875 len += resp_iec_m_pg(ap + len, pcontrol, target); 876 offset += len; 877 break; 878 default: 879 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 880 0); 881 return check_condition_result; 882 } 883 if (msense_6) 884 arr[0] = offset - 1; 885 else { 886 arr[0] = ((offset - 2) >> 8) & 0xff; 887 arr[1] = (offset - 2) & 0xff; 888 } 889 return fill_from_dev_buffer(scp, arr, min(alloc_len, offset)); 890 } 891 892 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, 893 int num, struct sdebug_dev_info * devip) 894 { 895 unsigned long iflags; 896 int ret; 897 898 if (upper_blk || (block + num > sdebug_capacity)) { 899 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 900 0); 901 return check_condition_result; 902 } 903 if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) && 904 (block <= OPT_MEDIUM_ERR_ADDR) && 905 ((block + num) > OPT_MEDIUM_ERR_ADDR)) { 906 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 907 0); 908 /* claim unrecoverable read error */ 909 return check_condition_result; 910 } 911 read_lock_irqsave(&atomic_rw, iflags); 912 ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), 913 num * SECT_SIZE); 914 read_unlock_irqrestore(&atomic_rw, iflags); 915 return ret; 916 } 917 918 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, 919 int num, struct sdebug_dev_info * devip) 920 { 921 unsigned long iflags; 922 int res; 923 924 if (upper_blk || (block + num > sdebug_capacity)) { 925 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 926 0); 927 return check_condition_result; 928 } 929 930 write_lock_irqsave(&atomic_rw, iflags); 931 res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), 932 num * SECT_SIZE); 933 write_unlock_irqrestore(&atomic_rw, iflags); 934 if (-1 == res) 935 return (DID_ERROR << 16); 936 else if ((res < (num * SECT_SIZE)) && 937 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) 938 printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, " 939 " IO sent=%d bytes\n", num * SECT_SIZE, res); 940 return 0; 941 } 942 943 #define SDEBUG_RLUN_ARR_SZ 128 944 945 static int resp_report_luns(struct scsi_cmnd * scp, 946 struct sdebug_dev_info * devip) 947 { 948 unsigned int alloc_len; 949 int lun_cnt, i, upper; 950 unsigned char *cmd = (unsigned char *)scp->cmnd; 951 int select_report = (int)cmd[2]; 952 struct scsi_lun *one_lun; 953 unsigned char arr[SDEBUG_RLUN_ARR_SZ]; 954 955 alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); 956 if ((alloc_len < 16) || (select_report > 2)) { 957 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 958 0); 959 return check_condition_result; 960 } 961 /* can produce response with up to 16k luns (lun 0 to lun 16383) */ 962 memset(arr, 0, SDEBUG_RLUN_ARR_SZ); 963 lun_cnt = scsi_debug_max_luns; 964 arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff; 965 arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff; 966 lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) / 967 sizeof(struct scsi_lun)), lun_cnt); 968 one_lun = (struct scsi_lun *) &arr[8]; 969 for (i = 0; i < lun_cnt; i++) { 970 upper = (i >> 8) & 0x3f; 971 if (upper) 972 one_lun[i].scsi_lun[0] = 973 (upper | (SAM2_LUN_ADDRESS_METHOD << 6)); 974 one_lun[i].scsi_lun[1] = i & 0xff; 975 } 976 return fill_from_dev_buffer(scp, arr, 977 min((int)alloc_len, SDEBUG_RLUN_ARR_SZ)); 978 } 979 980 /* When timer goes off this function is called. */ 981 static void timer_intr_handler(unsigned long indx) 982 { 983 struct sdebug_queued_cmd * sqcp; 984 unsigned long iflags; 985 986 if (indx >= SCSI_DEBUG_CANQUEUE) { 987 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too " 988 "large\n"); 989 return; 990 } 991 spin_lock_irqsave(&queued_arr_lock, iflags); 992 sqcp = &queued_arr[(int)indx]; 993 if (! sqcp->in_use) { 994 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected " 995 "interrupt\n"); 996 spin_unlock_irqrestore(&queued_arr_lock, iflags); 997 return; 998 } 999 sqcp->in_use = 0; 1000 if (sqcp->done_funct) { 1001 sqcp->a_cmnd->result = sqcp->scsi_result; 1002 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */ 1003 } 1004 sqcp->done_funct = NULL; 1005 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1006 } 1007 1008 static int scsi_debug_slave_alloc(struct scsi_device * sdp) 1009 { 1010 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1011 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n", 1012 sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); 1013 return 0; 1014 } 1015 1016 static int scsi_debug_slave_configure(struct scsi_device * sdp) 1017 { 1018 struct sdebug_dev_info * devip; 1019 1020 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1021 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n", 1022 sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); 1023 if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN) 1024 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN; 1025 devip = devInfoReg(sdp); 1026 sdp->hostdata = devip; 1027 if (sdp->host->cmd_per_lun) 1028 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING, 1029 sdp->host->cmd_per_lun); 1030 return 0; 1031 } 1032 1033 static void scsi_debug_slave_destroy(struct scsi_device * sdp) 1034 { 1035 struct sdebug_dev_info * devip = 1036 (struct sdebug_dev_info *)sdp->hostdata; 1037 1038 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1039 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n", 1040 sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); 1041 if (devip) { 1042 /* make this slot avaliable for re-use */ 1043 devip->used = 0; 1044 sdp->hostdata = NULL; 1045 } 1046 } 1047 1048 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev) 1049 { 1050 struct sdebug_host_info * sdbg_host; 1051 struct sdebug_dev_info * open_devip = NULL; 1052 struct sdebug_dev_info * devip = 1053 (struct sdebug_dev_info *)sdev->hostdata; 1054 1055 if (devip) 1056 return devip; 1057 sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata; 1058 if(! sdbg_host) { 1059 printk(KERN_ERR "Host info NULL\n"); 1060 return NULL; 1061 } 1062 list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { 1063 if ((devip->used) && (devip->channel == sdev->channel) && 1064 (devip->target == sdev->id) && 1065 (devip->lun == sdev->lun)) 1066 return devip; 1067 else { 1068 if ((!devip->used) && (!open_devip)) 1069 open_devip = devip; 1070 } 1071 } 1072 if (NULL == open_devip) { /* try and make a new one */ 1073 open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL); 1074 if (NULL == open_devip) { 1075 printk(KERN_ERR "%s: out of memory at line %d\n", 1076 __FUNCTION__, __LINE__); 1077 return NULL; 1078 } 1079 memset(open_devip, 0, sizeof(*open_devip)); 1080 open_devip->sdbg_host = sdbg_host; 1081 list_add_tail(&open_devip->dev_list, 1082 &sdbg_host->dev_info_list); 1083 } 1084 if (open_devip) { 1085 open_devip->channel = sdev->channel; 1086 open_devip->target = sdev->id; 1087 open_devip->lun = sdev->lun; 1088 open_devip->sdbg_host = sdbg_host; 1089 open_devip->reset = 1; 1090 open_devip->used = 1; 1091 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN); 1092 if (scsi_debug_dsense) 1093 open_devip->sense_buff[0] = 0x72; 1094 else { 1095 open_devip->sense_buff[0] = 0x70; 1096 open_devip->sense_buff[7] = 0xa; 1097 } 1098 return open_devip; 1099 } 1100 return NULL; 1101 } 1102 1103 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, 1104 int asc, int asq) 1105 { 1106 unsigned char * sbuff; 1107 1108 sbuff = devip->sense_buff; 1109 memset(sbuff, 0, SDEBUG_SENSE_LEN); 1110 if (scsi_debug_dsense) { 1111 sbuff[0] = 0x72; /* descriptor, current */ 1112 sbuff[1] = key; 1113 sbuff[2] = asc; 1114 sbuff[3] = asq; 1115 } else { 1116 sbuff[0] = 0x70; /* fixed, current */ 1117 sbuff[2] = key; 1118 sbuff[7] = 0xa; /* implies 18 byte sense buffer */ 1119 sbuff[12] = asc; 1120 sbuff[13] = asq; 1121 } 1122 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1123 printk(KERN_INFO "scsi_debug: [sense_key,asc,ascq]: " 1124 "[0x%x,0x%x,0x%x]\n", key, asc, asq); 1125 } 1126 1127 static int scsi_debug_abort(struct scsi_cmnd * SCpnt) 1128 { 1129 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1130 printk(KERN_INFO "scsi_debug: abort\n"); 1131 ++num_aborts; 1132 stop_queued_cmnd(SCpnt); 1133 return SUCCESS; 1134 } 1135 1136 static int scsi_debug_biosparam(struct scsi_device *sdev, 1137 struct block_device * bdev, sector_t capacity, int *info) 1138 { 1139 int res; 1140 unsigned char *buf; 1141 1142 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1143 printk(KERN_INFO "scsi_debug: biosparam\n"); 1144 buf = scsi_bios_ptable(bdev); 1145 if (buf) { 1146 res = scsi_partsize(buf, capacity, 1147 &info[2], &info[0], &info[1]); 1148 kfree(buf); 1149 if (! res) 1150 return res; 1151 } 1152 info[0] = sdebug_heads; 1153 info[1] = sdebug_sectors_per; 1154 info[2] = sdebug_cylinders_per; 1155 return 0; 1156 } 1157 1158 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt) 1159 { 1160 struct sdebug_dev_info * devip; 1161 1162 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1163 printk(KERN_INFO "scsi_debug: device_reset\n"); 1164 ++num_dev_resets; 1165 if (SCpnt) { 1166 devip = devInfoReg(SCpnt->device); 1167 if (devip) 1168 devip->reset = 1; 1169 } 1170 return SUCCESS; 1171 } 1172 1173 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt) 1174 { 1175 struct sdebug_host_info *sdbg_host; 1176 struct sdebug_dev_info * dev_info; 1177 struct scsi_device * sdp; 1178 struct Scsi_Host * hp; 1179 1180 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1181 printk(KERN_INFO "scsi_debug: bus_reset\n"); 1182 ++num_bus_resets; 1183 if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) { 1184 sdbg_host = *(struct sdebug_host_info **) hp->hostdata; 1185 if (sdbg_host) { 1186 list_for_each_entry(dev_info, 1187 &sdbg_host->dev_info_list, 1188 dev_list) 1189 dev_info->reset = 1; 1190 } 1191 } 1192 return SUCCESS; 1193 } 1194 1195 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt) 1196 { 1197 struct sdebug_host_info * sdbg_host; 1198 struct sdebug_dev_info * dev_info; 1199 1200 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1201 printk(KERN_INFO "scsi_debug: host_reset\n"); 1202 ++num_host_resets; 1203 spin_lock(&sdebug_host_list_lock); 1204 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { 1205 list_for_each_entry(dev_info, &sdbg_host->dev_info_list, 1206 dev_list) 1207 dev_info->reset = 1; 1208 } 1209 spin_unlock(&sdebug_host_list_lock); 1210 stop_all_queued(); 1211 return SUCCESS; 1212 } 1213 1214 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */ 1215 static int stop_queued_cmnd(struct scsi_cmnd * cmnd) 1216 { 1217 unsigned long iflags; 1218 int k; 1219 struct sdebug_queued_cmd * sqcp; 1220 1221 spin_lock_irqsave(&queued_arr_lock, iflags); 1222 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1223 sqcp = &queued_arr[k]; 1224 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) { 1225 del_timer_sync(&sqcp->cmnd_timer); 1226 sqcp->in_use = 0; 1227 sqcp->a_cmnd = NULL; 1228 break; 1229 } 1230 } 1231 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1232 return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0; 1233 } 1234 1235 /* Deletes (stops) timers of all queued commands */ 1236 static void stop_all_queued(void) 1237 { 1238 unsigned long iflags; 1239 int k; 1240 struct sdebug_queued_cmd * sqcp; 1241 1242 spin_lock_irqsave(&queued_arr_lock, iflags); 1243 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1244 sqcp = &queued_arr[k]; 1245 if (sqcp->in_use && sqcp->a_cmnd) { 1246 del_timer_sync(&sqcp->cmnd_timer); 1247 sqcp->in_use = 0; 1248 sqcp->a_cmnd = NULL; 1249 } 1250 } 1251 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1252 } 1253 1254 /* Initializes timers in queued array */ 1255 static void __init init_all_queued(void) 1256 { 1257 unsigned long iflags; 1258 int k; 1259 struct sdebug_queued_cmd * sqcp; 1260 1261 spin_lock_irqsave(&queued_arr_lock, iflags); 1262 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1263 sqcp = &queued_arr[k]; 1264 init_timer(&sqcp->cmnd_timer); 1265 sqcp->in_use = 0; 1266 sqcp->a_cmnd = NULL; 1267 } 1268 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1269 } 1270 1271 static void __init sdebug_build_parts(unsigned char * ramp) 1272 { 1273 struct partition * pp; 1274 int starts[SDEBUG_MAX_PARTS + 2]; 1275 int sectors_per_part, num_sectors, k; 1276 int heads_by_sects, start_sec, end_sec; 1277 1278 /* assume partition table already zeroed */ 1279 if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576)) 1280 return; 1281 if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) { 1282 scsi_debug_num_parts = SDEBUG_MAX_PARTS; 1283 printk(KERN_WARNING "scsi_debug:build_parts: reducing " 1284 "partitions to %d\n", SDEBUG_MAX_PARTS); 1285 } 1286 num_sectors = (int)(sdebug_store_size / SECT_SIZE); 1287 sectors_per_part = (num_sectors - sdebug_sectors_per) 1288 / scsi_debug_num_parts; 1289 heads_by_sects = sdebug_heads * sdebug_sectors_per; 1290 starts[0] = sdebug_sectors_per; 1291 for (k = 1; k < scsi_debug_num_parts; ++k) 1292 starts[k] = ((k * sectors_per_part) / heads_by_sects) 1293 * heads_by_sects; 1294 starts[scsi_debug_num_parts] = num_sectors; 1295 starts[scsi_debug_num_parts + 1] = 0; 1296 1297 ramp[510] = 0x55; /* magic partition markings */ 1298 ramp[511] = 0xAA; 1299 pp = (struct partition *)(ramp + 0x1be); 1300 for (k = 0; starts[k + 1]; ++k, ++pp) { 1301 start_sec = starts[k]; 1302 end_sec = starts[k + 1] - 1; 1303 pp->boot_ind = 0; 1304 1305 pp->cyl = start_sec / heads_by_sects; 1306 pp->head = (start_sec - (pp->cyl * heads_by_sects)) 1307 / sdebug_sectors_per; 1308 pp->sector = (start_sec % sdebug_sectors_per) + 1; 1309 1310 pp->end_cyl = end_sec / heads_by_sects; 1311 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects)) 1312 / sdebug_sectors_per; 1313 pp->end_sector = (end_sec % sdebug_sectors_per) + 1; 1314 1315 pp->start_sect = start_sec; 1316 pp->nr_sects = end_sec - start_sec + 1; 1317 pp->sys_ind = 0x83; /* plain Linux partition */ 1318 } 1319 } 1320 1321 static int schedule_resp(struct scsi_cmnd * cmnd, 1322 struct sdebug_dev_info * devip, 1323 done_funct_t done, int scsi_result, int delta_jiff) 1324 { 1325 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) { 1326 if (scsi_result) { 1327 struct scsi_device * sdp = cmnd->device; 1328 1329 printk(KERN_INFO "scsi_debug: <%u %u %u %u> " 1330 "non-zero result=0x%x\n", sdp->host->host_no, 1331 sdp->channel, sdp->id, sdp->lun, scsi_result); 1332 } 1333 } 1334 if (cmnd && devip) { 1335 /* simulate autosense by this driver */ 1336 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff)) 1337 memcpy(cmnd->sense_buffer, devip->sense_buff, 1338 (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ? 1339 SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE); 1340 } 1341 if (delta_jiff <= 0) { 1342 if (cmnd) 1343 cmnd->result = scsi_result; 1344 if (done) 1345 done(cmnd); 1346 return 0; 1347 } else { 1348 unsigned long iflags; 1349 int k; 1350 struct sdebug_queued_cmd * sqcp = NULL; 1351 1352 spin_lock_irqsave(&queued_arr_lock, iflags); 1353 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { 1354 sqcp = &queued_arr[k]; 1355 if (! sqcp->in_use) 1356 break; 1357 } 1358 if (k >= SCSI_DEBUG_CANQUEUE) { 1359 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1360 printk(KERN_WARNING "scsi_debug: can_queue exceeded\n"); 1361 return 1; /* report busy to mid level */ 1362 } 1363 sqcp->in_use = 1; 1364 sqcp->a_cmnd = cmnd; 1365 sqcp->scsi_result = scsi_result; 1366 sqcp->done_funct = done; 1367 sqcp->cmnd_timer.function = timer_intr_handler; 1368 sqcp->cmnd_timer.data = k; 1369 sqcp->cmnd_timer.expires = jiffies + delta_jiff; 1370 add_timer(&sqcp->cmnd_timer); 1371 spin_unlock_irqrestore(&queued_arr_lock, iflags); 1372 if (cmnd) 1373 cmnd->result = 0; 1374 return 0; 1375 } 1376 } 1377 1378 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 1379 * of sysfs parameters (which module_param doesn't yet support). 1380 * Sysfs parameters defined explicitly below. 1381 */ 1382 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */ 1383 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */ 1384 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0); 1385 module_param_named(dsense, scsi_debug_dsense, int, 0); 1386 module_param_named(every_nth, scsi_debug_every_nth, int, 0); 1387 module_param_named(max_luns, scsi_debug_max_luns, int, 0); 1388 module_param_named(num_parts, scsi_debug_num_parts, int, 0); 1389 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0); 1390 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */ 1391 module_param_named(ptype, scsi_debug_ptype, int, 0); 1392 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0); 1393 1394 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert"); 1395 MODULE_DESCRIPTION("SCSI debug adapter driver"); 1396 MODULE_LICENSE("GPL"); 1397 MODULE_VERSION(SCSI_DEBUG_VERSION); 1398 1399 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); 1400 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)"); 1401 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs"); 1402 MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)"); 1403 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)"); 1404 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate"); 1405 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)"); 1406 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate"); 1407 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->..."); 1408 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); 1409 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])"); 1410 1411 1412 static char sdebug_info[256]; 1413 1414 static const char * scsi_debug_info(struct Scsi_Host * shp) 1415 { 1416 sprintf(sdebug_info, "scsi_debug, version %s [%s], " 1417 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION, 1418 scsi_debug_version_date, scsi_debug_dev_size_mb, 1419 scsi_debug_opts); 1420 return sdebug_info; 1421 } 1422 1423 /* scsi_debug_proc_info 1424 * Used if the driver currently has no own support for /proc/scsi 1425 */ 1426 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, 1427 int length, int inout) 1428 { 1429 int len, pos, begin; 1430 int orig_length; 1431 1432 orig_length = length; 1433 1434 if (inout == 1) { 1435 char arr[16]; 1436 int minLen = length > 15 ? 15 : length; 1437 1438 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1439 return -EACCES; 1440 memcpy(arr, buffer, minLen); 1441 arr[minLen] = '\0'; 1442 if (1 != sscanf(arr, "%d", &pos)) 1443 return -EINVAL; 1444 scsi_debug_opts = pos; 1445 if (scsi_debug_every_nth != 0) 1446 scsi_debug_cmnd_count = 0; 1447 return length; 1448 } 1449 begin = 0; 1450 pos = len = sprintf(buffer, "scsi_debug adapter driver, version " 1451 "%s [%s]\n" 1452 "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, " 1453 "every_nth=%d(curr:%d)\n" 1454 "delay=%d, max_luns=%d, scsi_level=%d\n" 1455 "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n" 1456 "number of aborts=%d, device_reset=%d, bus_resets=%d, " 1457 "host_resets=%d\n", 1458 SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts, 1459 scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth, 1460 scsi_debug_cmnd_count, scsi_debug_delay, 1461 scsi_debug_max_luns, scsi_debug_scsi_level, 1462 SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per, 1463 num_aborts, num_dev_resets, num_bus_resets, num_host_resets); 1464 if (pos < offset) { 1465 len = 0; 1466 begin = pos; 1467 } 1468 *start = buffer + (offset - begin); /* Start of wanted data */ 1469 len -= (offset - begin); 1470 if (len > length) 1471 len = length; 1472 return len; 1473 } 1474 1475 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf) 1476 { 1477 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay); 1478 } 1479 1480 static ssize_t sdebug_delay_store(struct device_driver * ddp, 1481 const char * buf, size_t count) 1482 { 1483 int delay; 1484 char work[20]; 1485 1486 if (1 == sscanf(buf, "%10s", work)) { 1487 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) { 1488 scsi_debug_delay = delay; 1489 return count; 1490 } 1491 } 1492 return -EINVAL; 1493 } 1494 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show, 1495 sdebug_delay_store); 1496 1497 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf) 1498 { 1499 return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts); 1500 } 1501 1502 static ssize_t sdebug_opts_store(struct device_driver * ddp, 1503 const char * buf, size_t count) 1504 { 1505 int opts; 1506 char work[20]; 1507 1508 if (1 == sscanf(buf, "%10s", work)) { 1509 if (0 == strnicmp(work,"0x", 2)) { 1510 if (1 == sscanf(&work[2], "%x", &opts)) 1511 goto opts_done; 1512 } else { 1513 if (1 == sscanf(work, "%d", &opts)) 1514 goto opts_done; 1515 } 1516 } 1517 return -EINVAL; 1518 opts_done: 1519 scsi_debug_opts = opts; 1520 scsi_debug_cmnd_count = 0; 1521 return count; 1522 } 1523 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show, 1524 sdebug_opts_store); 1525 1526 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf) 1527 { 1528 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype); 1529 } 1530 static ssize_t sdebug_ptype_store(struct device_driver * ddp, 1531 const char * buf, size_t count) 1532 { 1533 int n; 1534 1535 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1536 scsi_debug_ptype = n; 1537 return count; 1538 } 1539 return -EINVAL; 1540 } 1541 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store); 1542 1543 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf) 1544 { 1545 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense); 1546 } 1547 static ssize_t sdebug_dsense_store(struct device_driver * ddp, 1548 const char * buf, size_t count) 1549 { 1550 int n; 1551 1552 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1553 scsi_debug_dsense = n; 1554 return count; 1555 } 1556 return -EINVAL; 1557 } 1558 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show, 1559 sdebug_dsense_store); 1560 1561 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf) 1562 { 1563 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts); 1564 } 1565 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp, 1566 const char * buf, size_t count) 1567 { 1568 int n; 1569 1570 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1571 scsi_debug_num_tgts = n; 1572 sdebug_max_tgts_luns(); 1573 return count; 1574 } 1575 return -EINVAL; 1576 } 1577 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show, 1578 sdebug_num_tgts_store); 1579 1580 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf) 1581 { 1582 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb); 1583 } 1584 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL); 1585 1586 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf) 1587 { 1588 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts); 1589 } 1590 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL); 1591 1592 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf) 1593 { 1594 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth); 1595 } 1596 static ssize_t sdebug_every_nth_store(struct device_driver * ddp, 1597 const char * buf, size_t count) 1598 { 1599 int nth; 1600 1601 if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) { 1602 scsi_debug_every_nth = nth; 1603 scsi_debug_cmnd_count = 0; 1604 return count; 1605 } 1606 return -EINVAL; 1607 } 1608 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show, 1609 sdebug_every_nth_store); 1610 1611 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf) 1612 { 1613 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns); 1614 } 1615 static ssize_t sdebug_max_luns_store(struct device_driver * ddp, 1616 const char * buf, size_t count) 1617 { 1618 int n; 1619 1620 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { 1621 scsi_debug_max_luns = n; 1622 sdebug_max_tgts_luns(); 1623 return count; 1624 } 1625 return -EINVAL; 1626 } 1627 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show, 1628 sdebug_max_luns_store); 1629 1630 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf) 1631 { 1632 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level); 1633 } 1634 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL); 1635 1636 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf) 1637 { 1638 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host); 1639 } 1640 1641 static ssize_t sdebug_add_host_store(struct device_driver * ddp, 1642 const char * buf, size_t count) 1643 { 1644 int delta_hosts; 1645 char work[20]; 1646 1647 if (1 != sscanf(buf, "%10s", work)) 1648 return -EINVAL; 1649 { /* temporary hack around sscanf() problem with -ve nums */ 1650 int neg = 0; 1651 1652 if ('-' == *work) 1653 neg = 1; 1654 if (1 != sscanf(work + neg, "%d", &delta_hosts)) 1655 return -EINVAL; 1656 if (neg) 1657 delta_hosts = -delta_hosts; 1658 } 1659 if (delta_hosts > 0) { 1660 do { 1661 sdebug_add_adapter(); 1662 } while (--delta_hosts); 1663 } else if (delta_hosts < 0) { 1664 do { 1665 sdebug_remove_adapter(); 1666 } while (++delta_hosts); 1667 } 1668 return count; 1669 } 1670 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show, 1671 sdebug_add_host_store); 1672 1673 static void do_create_driverfs_files(void) 1674 { 1675 driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host); 1676 driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay); 1677 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); 1678 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense); 1679 driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth); 1680 driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns); 1681 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); 1682 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts); 1683 driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype); 1684 driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts); 1685 driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); 1686 } 1687 1688 static void do_remove_driverfs_files(void) 1689 { 1690 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); 1691 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts); 1692 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype); 1693 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts); 1694 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); 1695 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns); 1696 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth); 1697 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense); 1698 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); 1699 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay); 1700 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host); 1701 } 1702 1703 static int __init scsi_debug_init(void) 1704 { 1705 unsigned long sz; 1706 int host_to_add; 1707 int k; 1708 1709 if (scsi_debug_dev_size_mb < 1) 1710 scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */ 1711 sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576; 1712 sdebug_capacity = sdebug_store_size / SECT_SIZE; 1713 1714 /* play around with geometry, don't waste too much on track 0 */ 1715 sdebug_heads = 8; 1716 sdebug_sectors_per = 32; 1717 if (scsi_debug_dev_size_mb >= 16) 1718 sdebug_heads = 32; 1719 else if (scsi_debug_dev_size_mb >= 256) 1720 sdebug_heads = 64; 1721 sdebug_cylinders_per = (unsigned long)sdebug_capacity / 1722 (sdebug_sectors_per * sdebug_heads); 1723 if (sdebug_cylinders_per >= 1024) { 1724 /* other LLDs do this; implies >= 1GB ram disk ... */ 1725 sdebug_heads = 255; 1726 sdebug_sectors_per = 63; 1727 sdebug_cylinders_per = (unsigned long)sdebug_capacity / 1728 (sdebug_sectors_per * sdebug_heads); 1729 } 1730 1731 sz = sdebug_store_size; 1732 fake_storep = vmalloc(sz); 1733 if (NULL == fake_storep) { 1734 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n"); 1735 return -ENOMEM; 1736 } 1737 memset(fake_storep, 0, sz); 1738 if (scsi_debug_num_parts > 0) 1739 sdebug_build_parts(fake_storep); 1740 1741 init_all_queued(); 1742 1743 device_register(&pseudo_primary); 1744 bus_register(&pseudo_lld_bus); 1745 driver_register(&sdebug_driverfs_driver); 1746 do_create_driverfs_files(); 1747 1748 sdebug_driver_template.proc_name = (char *)sdebug_proc_name; 1749 1750 host_to_add = scsi_debug_add_host; 1751 scsi_debug_add_host = 0; 1752 1753 for (k = 0; k < host_to_add; k++) { 1754 if (sdebug_add_adapter()) { 1755 printk(KERN_ERR "scsi_debug_init: " 1756 "sdebug_add_adapter failed k=%d\n", k); 1757 break; 1758 } 1759 } 1760 1761 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { 1762 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n", 1763 scsi_debug_add_host); 1764 } 1765 return 0; 1766 } 1767 1768 static void __exit scsi_debug_exit(void) 1769 { 1770 int k = scsi_debug_add_host; 1771 1772 stop_all_queued(); 1773 for (; k; k--) 1774 sdebug_remove_adapter(); 1775 do_remove_driverfs_files(); 1776 driver_unregister(&sdebug_driverfs_driver); 1777 bus_unregister(&pseudo_lld_bus); 1778 device_unregister(&pseudo_primary); 1779 1780 vfree(fake_storep); 1781 } 1782 1783 device_initcall(scsi_debug_init); 1784 module_exit(scsi_debug_exit); 1785 1786 static void pseudo_0_release(struct device * dev) 1787 { 1788 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) 1789 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n"); 1790 } 1791 1792 static struct device pseudo_primary = { 1793 .bus_id = "pseudo_0", 1794 .release = pseudo_0_release, 1795 }; 1796 1797 static int pseudo_lld_bus_match(struct device *dev, 1798 struct device_driver *dev_driver) 1799 { 1800 return 1; 1801 } 1802 1803 static struct bus_type pseudo_lld_bus = { 1804 .name = "pseudo", 1805 .match = pseudo_lld_bus_match, 1806 }; 1807 1808 static void sdebug_release_adapter(struct device * dev) 1809 { 1810 struct sdebug_host_info *sdbg_host; 1811 1812 sdbg_host = to_sdebug_host(dev); 1813 kfree(sdbg_host); 1814 } 1815 1816 static int sdebug_add_adapter(void) 1817 { 1818 int k, devs_per_host; 1819 int error = 0; 1820 struct sdebug_host_info *sdbg_host; 1821 struct sdebug_dev_info *sdbg_devinfo; 1822 struct list_head *lh, *lh_sf; 1823 1824 sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL); 1825 1826 if (NULL == sdbg_host) { 1827 printk(KERN_ERR "%s: out of memory at line %d\n", 1828 __FUNCTION__, __LINE__); 1829 return -ENOMEM; 1830 } 1831 1832 memset(sdbg_host, 0, sizeof(*sdbg_host)); 1833 INIT_LIST_HEAD(&sdbg_host->dev_info_list); 1834 1835 devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns; 1836 for (k = 0; k < devs_per_host; k++) { 1837 sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL); 1838 if (NULL == sdbg_devinfo) { 1839 printk(KERN_ERR "%s: out of memory at line %d\n", 1840 __FUNCTION__, __LINE__); 1841 error = -ENOMEM; 1842 goto clean; 1843 } 1844 memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo)); 1845 sdbg_devinfo->sdbg_host = sdbg_host; 1846 list_add_tail(&sdbg_devinfo->dev_list, 1847 &sdbg_host->dev_info_list); 1848 } 1849 1850 spin_lock(&sdebug_host_list_lock); 1851 list_add_tail(&sdbg_host->host_list, &sdebug_host_list); 1852 spin_unlock(&sdebug_host_list_lock); 1853 1854 sdbg_host->dev.bus = &pseudo_lld_bus; 1855 sdbg_host->dev.parent = &pseudo_primary; 1856 sdbg_host->dev.release = &sdebug_release_adapter; 1857 sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host); 1858 1859 error = device_register(&sdbg_host->dev); 1860 1861 if (error) 1862 goto clean; 1863 1864 ++scsi_debug_add_host; 1865 return error; 1866 1867 clean: 1868 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { 1869 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, 1870 dev_list); 1871 list_del(&sdbg_devinfo->dev_list); 1872 kfree(sdbg_devinfo); 1873 } 1874 1875 kfree(sdbg_host); 1876 return error; 1877 } 1878 1879 static void sdebug_remove_adapter(void) 1880 { 1881 struct sdebug_host_info * sdbg_host = NULL; 1882 1883 spin_lock(&sdebug_host_list_lock); 1884 if (!list_empty(&sdebug_host_list)) { 1885 sdbg_host = list_entry(sdebug_host_list.prev, 1886 struct sdebug_host_info, host_list); 1887 list_del(&sdbg_host->host_list); 1888 } 1889 spin_unlock(&sdebug_host_list_lock); 1890 1891 if (!sdbg_host) 1892 return; 1893 1894 device_unregister(&sdbg_host->dev); 1895 --scsi_debug_add_host; 1896 } 1897 1898 static int sdebug_driver_probe(struct device * dev) 1899 { 1900 int error = 0; 1901 struct sdebug_host_info *sdbg_host; 1902 struct Scsi_Host *hpnt; 1903 1904 sdbg_host = to_sdebug_host(dev); 1905 1906 hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); 1907 if (NULL == hpnt) { 1908 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__); 1909 error = -ENODEV; 1910 return error; 1911 } 1912 1913 sdbg_host->shost = hpnt; 1914 *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; 1915 if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id)) 1916 hpnt->max_id = scsi_debug_num_tgts + 1; 1917 else 1918 hpnt->max_id = scsi_debug_num_tgts; 1919 hpnt->max_lun = scsi_debug_max_luns; 1920 1921 error = scsi_add_host(hpnt, &sdbg_host->dev); 1922 if (error) { 1923 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__); 1924 error = -ENODEV; 1925 scsi_host_put(hpnt); 1926 } else 1927 scsi_scan_host(hpnt); 1928 1929 1930 return error; 1931 } 1932 1933 static int sdebug_driver_remove(struct device * dev) 1934 { 1935 struct list_head *lh, *lh_sf; 1936 struct sdebug_host_info *sdbg_host; 1937 struct sdebug_dev_info *sdbg_devinfo; 1938 1939 sdbg_host = to_sdebug_host(dev); 1940 1941 if (!sdbg_host) { 1942 printk(KERN_ERR "%s: Unable to locate host info\n", 1943 __FUNCTION__); 1944 return -ENODEV; 1945 } 1946 1947 scsi_remove_host(sdbg_host->shost); 1948 1949 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { 1950 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, 1951 dev_list); 1952 list_del(&sdbg_devinfo->dev_list); 1953 kfree(sdbg_devinfo); 1954 } 1955 1956 scsi_host_put(sdbg_host->shost); 1957 return 0; 1958 } 1959 1960 static void sdebug_max_tgts_luns(void) 1961 { 1962 struct sdebug_host_info * sdbg_host; 1963 struct Scsi_Host *hpnt; 1964 1965 spin_lock(&sdebug_host_list_lock); 1966 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { 1967 hpnt = sdbg_host->shost; 1968 if ((hpnt->this_id >= 0) && 1969 (scsi_debug_num_tgts > hpnt->this_id)) 1970 hpnt->max_id = scsi_debug_num_tgts + 1; 1971 else 1972 hpnt->max_id = scsi_debug_num_tgts; 1973 hpnt->max_lun = scsi_debug_max_luns; 1974 } 1975 spin_unlock(&sdebug_host_list_lock); 1976 } 1977