/* * linux/kernel/scsi_debug.c * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv * Copyright (C) 1992 Eric Youngdale * Simulate a host adapter with 2 disks attached. Do a lot of checking * to make sure that we are not getting blocks mixed up, and PANIC if * anything out of the ordinary is seen. * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ * * This version is more generic, simulating a variable number of disk * (or disk like devices) sharing a common amount of RAM * * * For documentation see http://www.torque.net/sg/sdebug26.html * * D. Gilbert (dpg) work for Magneto-Optical device test [20010421] * dpg: work for devfs large number of disks [20010809] * forked for lk 2.5 series [20011216, 20020101] * use vmalloc() more inquiry+mode_sense [20020302] * add timers for delayed responses [20020721] * Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031] * Mike Anderson <andmike@us.ibm.com> sysfs work [20021118] * dpg: change style of boot options to "scsi_debug.num_tgts=2" and * module options to "modprobe scsi_debug num_tgts=2" [20021221] */ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/timer.h> #include <linux/types.h> #include <linux/string.h> #include <linux/genhd.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <linux/smp_lock.h> #include <linux/vmalloc.h> #include <linux/moduleparam.h> #include <linux/blkdev.h> #include "scsi.h" #include <scsi/scsi_host.h> #include <scsi/scsicam.h> #include <linux/stat.h> #ifndef LINUX_VERSION_CODE #include <linux/version.h> #endif #include "scsi_logging.h" #include "scsi_debug.h" #define SCSI_DEBUG_VERSION "1.75" static const char * scsi_debug_version_date = "20050113"; /* Additional Sense Code (ASC) used */ #define NO_ADDED_SENSE 0x0 #define UNRECOVERED_READ_ERR 0x11 #define INVALID_OPCODE 0x20 #define ADDR_OUT_OF_RANGE 0x21 #define INVALID_FIELD_IN_CDB 0x24 #define POWERON_RESET 0x29 #define SAVING_PARAMS_UNSUP 0x39 #define THRESHHOLD_EXCEEDED 0x5d #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */ /* Default values for driver parameters */ #define DEF_NUM_HOST 1 #define DEF_NUM_TGTS 1 #define DEF_MAX_LUNS 1 /* With these defaults, this driver will make 1 host with 1 target * (id 0) containing 1 logical unit (lun 0). That is 1 device. */ #define DEF_DELAY 1 #define DEF_DEV_SIZE_MB 8 #define DEF_EVERY_NTH 0 #define DEF_NUM_PARTS 0 #define DEF_OPTS 0 #define DEF_SCSI_LEVEL 5 /* INQUIRY, byte2 [5->SPC-3] */ #define DEF_PTYPE 0 #define DEF_D_SENSE 0 /* bit mask values for scsi_debug_opts */ #define SCSI_DEBUG_OPT_NOISE 1 #define SCSI_DEBUG_OPT_MEDIUM_ERR 2 #define SCSI_DEBUG_OPT_TIMEOUT 4 #define SCSI_DEBUG_OPT_RECOVERED_ERR 8 /* When "every_nth" > 0 then modulo "every_nth" commands: * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set * - a RECOVERED_ERROR is simulated on successful read and write * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. * * When "every_nth" < 0 then after "- every_nth" commands: * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set * - a RECOVERED_ERROR is simulated on successful read and write * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. * This will continue until some other action occurs (e.g. the user * writing a new value (other than -1 or 1) to every_nth via sysfs). */ /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this * sector on read commands: */ #define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) * or "peripheral device" addressing (value 0) */ #define SAM2_LUN_ADDRESS_METHOD 0 static int scsi_debug_add_host = DEF_NUM_HOST; static int scsi_debug_delay = DEF_DELAY; static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB; static int scsi_debug_every_nth = DEF_EVERY_NTH; static int scsi_debug_max_luns = DEF_MAX_LUNS; static int scsi_debug_num_parts = DEF_NUM_PARTS; static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */ static int scsi_debug_opts = DEF_OPTS; static int scsi_debug_scsi_level = DEF_SCSI_LEVEL; static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */ static int scsi_debug_dsense = DEF_D_SENSE; static int scsi_debug_cmnd_count = 0; #define DEV_READONLY(TGT) (0) #define DEV_REMOVEABLE(TGT) (0) static unsigned long sdebug_store_size; /* in bytes */ static sector_t sdebug_capacity; /* in sectors */ /* old BIOS stuff, kernel may get rid of them but some mode sense pages may still need them */ static int sdebug_heads; /* heads per disk */ static int sdebug_cylinders_per; /* cylinders per surface */ static int sdebug_sectors_per; /* sectors per cylinder */ /* default sector size is 512 bytes, 2**9 bytes */ #define POW2_SECT_SIZE 9 #define SECT_SIZE (1 << POW2_SECT_SIZE) #define SECT_SIZE_PER(TGT) SECT_SIZE #define SDEBUG_MAX_PARTS 4 #define SDEBUG_SENSE_LEN 32 struct sdebug_dev_info { struct list_head dev_list; unsigned char sense_buff[SDEBUG_SENSE_LEN]; /* weak nexus */ unsigned int channel; unsigned int target; unsigned int lun; struct sdebug_host_info *sdbg_host; char reset; char used; }; struct sdebug_host_info { struct list_head host_list; struct Scsi_Host *shost; struct device dev; struct list_head dev_info_list; }; #define to_sdebug_host(d) \ container_of(d, struct sdebug_host_info, dev) static LIST_HEAD(sdebug_host_list); static DEFINE_SPINLOCK(sdebug_host_list_lock); typedef void (* done_funct_t) (struct scsi_cmnd *); struct sdebug_queued_cmd { int in_use; struct timer_list cmnd_timer; done_funct_t done_funct; struct scsi_cmnd * a_cmnd; int scsi_result; }; static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE]; static Scsi_Host_Template sdebug_driver_template = { .proc_info = scsi_debug_proc_info, .name = "SCSI DEBUG", .info = scsi_debug_info, .slave_alloc = scsi_debug_slave_alloc, .slave_configure = scsi_debug_slave_configure, .slave_destroy = scsi_debug_slave_destroy, .ioctl = scsi_debug_ioctl, .queuecommand = scsi_debug_queuecommand, .eh_abort_handler = scsi_debug_abort, .eh_bus_reset_handler = scsi_debug_bus_reset, .eh_device_reset_handler = scsi_debug_device_reset, .eh_host_reset_handler = scsi_debug_host_reset, .bios_param = scsi_debug_biosparam, .can_queue = SCSI_DEBUG_CANQUEUE, .this_id = 7, .sg_tablesize = 64, .cmd_per_lun = 3, .max_sectors = 4096, .unchecked_isa_dma = 0, .use_clustering = DISABLE_CLUSTERING, .module = THIS_MODULE, }; static unsigned char * fake_storep; /* ramdisk storage */ static int num_aborts = 0; static int num_dev_resets = 0; static int num_bus_resets = 0; static int num_host_resets = 0; static DEFINE_SPINLOCK(queued_arr_lock); static DEFINE_RWLOCK(atomic_rw); static char sdebug_proc_name[] = "scsi_debug"; static int sdebug_driver_probe(struct device *); static int sdebug_driver_remove(struct device *); static struct bus_type pseudo_lld_bus; static struct device_driver sdebug_driverfs_driver = { .name = sdebug_proc_name, .bus = &pseudo_lld_bus, .probe = sdebug_driver_probe, .remove = sdebug_driver_remove, }; static const int check_condition_result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; /* function declarations */ static int resp_inquiry(struct scsi_cmnd * SCpnt, int target, struct sdebug_dev_info * devip); static int resp_requests(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip); static int resp_readcap(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip); static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target, struct sdebug_dev_info * devip); static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, int num, struct sdebug_dev_info * devip); static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, int num, struct sdebug_dev_info * devip); static int resp_report_luns(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip); static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, int arr_len); static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, int max_arr_len); static void timer_intr_handler(unsigned long); static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev); static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, int asc, int asq); static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip); static int schedule_resp(struct scsi_cmnd * cmnd, struct sdebug_dev_info * devip, done_funct_t done, int scsi_result, int delta_jiff); static void __init sdebug_build_parts(unsigned char * ramp); static void __init init_all_queued(void); static void stop_all_queued(void); static int stop_queued_cmnd(struct scsi_cmnd * cmnd); static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, const char * dev_id_str, int dev_id_str_len); static void do_create_driverfs_files(void); static void do_remove_driverfs_files(void); static int sdebug_add_adapter(void); static void sdebug_remove_adapter(void); static void sdebug_max_tgts_luns(void); static struct device pseudo_primary; static struct bus_type pseudo_lld_bus; static int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done) { unsigned char *cmd = (unsigned char *) SCpnt->cmnd; int block, upper_blk, num, k; int errsts = 0; int target = scmd_id(SCpnt); struct sdebug_dev_info * devip = NULL; int inj_recovered = 0; if (done == NULL) return 0; /* assume mid level reprocessing command */ if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) { printk(KERN_INFO "scsi_debug: cmd "); for (k = 0, num = SCpnt->cmd_len; k < num; ++k) printk("%02x ", (int)cmd[k]); printk("\n"); } if(target == sdebug_driver_template.this_id) { printk(KERN_INFO "scsi_debug: initiator's id used as " "target!\n"); return schedule_resp(SCpnt, NULL, done, DID_NO_CONNECT << 16, 0); } if (SCpnt->device->lun >= scsi_debug_max_luns) return schedule_resp(SCpnt, NULL, done, DID_NO_CONNECT << 16, 0); devip = devInfoReg(SCpnt->device); if (NULL == devip) return schedule_resp(SCpnt, NULL, done, DID_NO_CONNECT << 16, 0); if ((scsi_debug_every_nth != 0) && (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) { scsi_debug_cmnd_count = 0; if (scsi_debug_every_nth < -1) scsi_debug_every_nth = -1; if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts) return 0; /* ignore command causing timeout */ else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts) inj_recovered = 1; /* to reads and writes below */ } switch (*cmd) { case INQUIRY: /* mandatory, ignore unit attention */ errsts = resp_inquiry(SCpnt, target, devip); break; case REQUEST_SENSE: /* mandatory, ignore unit attention */ errsts = resp_requests(SCpnt, devip); break; case REZERO_UNIT: /* actually this is REWIND for SSC */ case START_STOP: errsts = check_reset(SCpnt, devip); break; case ALLOW_MEDIUM_REMOVAL: if ((errsts = check_reset(SCpnt, devip))) break; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: Medium removal %s\n", cmd[4] ? "inhibited" : "enabled"); break; case SEND_DIAGNOSTIC: /* mandatory */ errsts = check_reset(SCpnt, devip); break; case TEST_UNIT_READY: /* mandatory */ errsts = check_reset(SCpnt, devip); break; case RESERVE: errsts = check_reset(SCpnt, devip); break; case RESERVE_10: errsts = check_reset(SCpnt, devip); break; case RELEASE: errsts = check_reset(SCpnt, devip); break; case RELEASE_10: errsts = check_reset(SCpnt, devip); break; case READ_CAPACITY: errsts = resp_readcap(SCpnt, devip); break; case READ_16: case READ_12: case READ_10: case READ_6: if ((errsts = check_reset(SCpnt, devip))) break; upper_blk = 0; if ((*cmd) == READ_16) { upper_blk = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); block = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); num = cmd[13] + (cmd[12] << 8) + (cmd[11] << 16) + (cmd[10] << 24); } else if ((*cmd) == READ_12) { block = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); num = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); } else if ((*cmd) == READ_10) { block = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); num = cmd[8] + (cmd[7] << 8); } else { block = cmd[3] + (cmd[2] << 8) + ((cmd[1] & 0x1f) << 16); num = cmd[4]; } errsts = resp_read(SCpnt, upper_blk, block, num, devip); if (inj_recovered && (0 == errsts)) { mk_sense_buffer(devip, RECOVERED_ERROR, THRESHHOLD_EXCEEDED, 0); errsts = check_condition_result; } break; case REPORT_LUNS: /* mandatory, ignore unit attention */ errsts = resp_report_luns(SCpnt, devip); break; case VERIFY: /* 10 byte SBC-2 command */ errsts = check_reset(SCpnt, devip); break; case WRITE_16: case WRITE_12: case WRITE_10: case WRITE_6: if ((errsts = check_reset(SCpnt, devip))) break; upper_blk = 0; if ((*cmd) == WRITE_16) { upper_blk = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); block = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); num = cmd[13] + (cmd[12] << 8) + (cmd[11] << 16) + (cmd[10] << 24); } else if ((*cmd) == WRITE_12) { block = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); num = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); } else if ((*cmd) == WRITE_10) { block = cmd[5] + (cmd[4] << 8) + (cmd[3] << 16) + (cmd[2] << 24); num = cmd[8] + (cmd[7] << 8); } else { block = cmd[3] + (cmd[2] << 8) + ((cmd[1] & 0x1f) << 16); num = cmd[4]; } errsts = resp_write(SCpnt, upper_blk, block, num, devip); if (inj_recovered && (0 == errsts)) { mk_sense_buffer(devip, RECOVERED_ERROR, THRESHHOLD_EXCEEDED, 0); errsts = check_condition_result; } break; case MODE_SENSE: case MODE_SENSE_10: errsts = resp_mode_sense(SCpnt, target, devip); break; case SYNCHRONIZE_CACHE: errsts = check_reset(SCpnt, devip); break; default: if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: Opcode: 0x%x not " "supported\n", *cmd); if ((errsts = check_reset(SCpnt, devip))) break; /* Unit attention takes precedence */ mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0); errsts = check_condition_result; break; } return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay); } static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) { if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd); } return -EINVAL; /* return -ENOTTY; // correct return but upsets fdisk */ } static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip) { if (devip->reset) { if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: Reporting Unit " "attention: power on reset\n"); devip->reset = 0; mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0); return check_condition_result; } return 0; } /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, int arr_len) { int k, req_len, act_len, len, active; void * kaddr; void * kaddr_off; struct scatterlist * sgpnt; if (0 == scp->request_bufflen) return 0; if (NULL == scp->request_buffer) return (DID_ERROR << 16); if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || (scp->sc_data_direction == DMA_FROM_DEVICE))) return (DID_ERROR << 16); if (0 == scp->use_sg) { req_len = scp->request_bufflen; act_len = (req_len < arr_len) ? req_len : arr_len; memcpy(scp->request_buffer, arr, act_len); scp->resid = req_len - act_len; return 0; } sgpnt = (struct scatterlist *)scp->request_buffer; active = 1; for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) { if (active) { kaddr = (unsigned char *) kmap_atomic(sgpnt->page, KM_USER0); if (NULL == kaddr) return (DID_ERROR << 16); kaddr_off = (unsigned char *)kaddr + sgpnt->offset; len = sgpnt->length; if ((req_len + len) > arr_len) { active = 0; len = arr_len - req_len; } memcpy(kaddr_off, arr + req_len, len); kunmap_atomic(kaddr, KM_USER0); act_len += len; } req_len += sgpnt->length; } scp->resid = req_len - act_len; return 0; } /* Returns number of bytes fetched into 'arr' or -1 if error. */ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr, int max_arr_len) { int k, req_len, len, fin; void * kaddr; void * kaddr_off; struct scatterlist * sgpnt; if (0 == scp->request_bufflen) return 0; if (NULL == scp->request_buffer) return -1; if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) || (scp->sc_data_direction == DMA_TO_DEVICE))) return -1; if (0 == scp->use_sg) { req_len = scp->request_bufflen; len = (req_len < max_arr_len) ? req_len : max_arr_len; memcpy(arr, scp->request_buffer, len); return len; } sgpnt = (struct scatterlist *)scp->request_buffer; for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) { kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0); if (NULL == kaddr) return -1; kaddr_off = (unsigned char *)kaddr + sgpnt->offset; len = sgpnt->length; if ((req_len + len) > max_arr_len) { len = max_arr_len - req_len; fin = 1; } memcpy(arr + req_len, kaddr_off, len); kunmap_atomic(kaddr, KM_USER0); if (fin) return req_len + len; req_len += sgpnt->length; } return req_len; } static const char * inq_vendor_id = "Linux "; static const char * inq_product_id = "scsi_debug "; static const char * inq_product_rev = "0004"; static int inquiry_evpd_83(unsigned char * arr, int dev_id_num, const char * dev_id_str, int dev_id_str_len) { int num; /* Two identification descriptors: */ /* T10 vendor identifier field format (faked) */ arr[0] = 0x2; /* ASCII */ arr[1] = 0x1; arr[2] = 0x0; memcpy(&arr[4], inq_vendor_id, 8); memcpy(&arr[12], inq_product_id, 16); memcpy(&arr[28], dev_id_str, dev_id_str_len); num = 8 + 16 + dev_id_str_len; arr[3] = num; num += 4; /* NAA IEEE registered identifier (faked) */ arr[num] = 0x1; /* binary */ arr[num + 1] = 0x3; arr[num + 2] = 0x0; arr[num + 3] = 0x8; arr[num + 4] = 0x51; /* ieee company id=0x123456 (faked) */ arr[num + 5] = 0x23; arr[num + 6] = 0x45; arr[num + 7] = 0x60; arr[num + 8] = (dev_id_num >> 24); arr[num + 9] = (dev_id_num >> 16) & 0xff; arr[num + 10] = (dev_id_num >> 8) & 0xff; arr[num + 11] = dev_id_num & 0xff; return num + 12; } #define SDEBUG_LONG_INQ_SZ 96 #define SDEBUG_MAX_INQ_ARR_SZ 128 static int resp_inquiry(struct scsi_cmnd * scp, int target, struct sdebug_dev_info * devip) { unsigned char pq_pdt; unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ]; unsigned char *cmd = (unsigned char *)scp->cmnd; int alloc_len; alloc_len = (cmd[3] << 8) + cmd[4]; memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ); pq_pdt = (scsi_debug_ptype & 0x1f); arr[0] = pq_pdt; if (0x2 & cmd[1]) { /* CMDDT bit set */ mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); return check_condition_result; } else if (0x1 & cmd[1]) { /* EVPD bit set */ int dev_id_num, len; char dev_id_str[6]; dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) + (devip->target * 1000) + devip->lun; len = scnprintf(dev_id_str, 6, "%d", dev_id_num); if (0 == cmd[2]) { /* supported vital product data pages */ arr[3] = 3; arr[4] = 0x0; /* this page */ arr[5] = 0x80; /* unit serial number */ arr[6] = 0x83; /* device identification */ } else if (0x80 == cmd[2]) { /* unit serial number */ arr[1] = 0x80; arr[3] = len; memcpy(&arr[4], dev_id_str, len); } else if (0x83 == cmd[2]) { /* device identification */ arr[1] = 0x83; arr[3] = inquiry_evpd_83(&arr[4], dev_id_num, dev_id_str, len); } else { /* Illegal request, invalid field in cdb */ mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); return check_condition_result; } return fill_from_dev_buffer(scp, arr, min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ)); } /* drops through here for a standard inquiry */ arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0; /* Removable disk */ arr[2] = scsi_debug_scsi_level; arr[3] = 2; /* response_data_format==2 */ arr[4] = SDEBUG_LONG_INQ_SZ - 5; arr[6] = 0x1; /* claim: ADDR16 */ /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */ arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */ memcpy(&arr[8], inq_vendor_id, 8); memcpy(&arr[16], inq_product_id, 16); memcpy(&arr[32], inq_product_rev, 4); /* version descriptors (2 bytes each) follow */ arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */ arr[60] = 0x3; arr[61] = 0x0; /* SPC-3 */ if (scsi_debug_ptype == 0) { arr[62] = 0x1; arr[63] = 0x80; /* SBC */ } else if (scsi_debug_ptype == 1) { arr[62] = 0x2; arr[63] = 0x00; /* SSC */ } return fill_from_dev_buffer(scp, arr, min(alloc_len, SDEBUG_LONG_INQ_SZ)); } static int resp_requests(struct scsi_cmnd * scp, struct sdebug_dev_info * devip) { unsigned char * sbuff; unsigned char *cmd = (unsigned char *)scp->cmnd; unsigned char arr[SDEBUG_SENSE_LEN]; int len = 18; memset(arr, 0, SDEBUG_SENSE_LEN); if (devip->reset == 1) mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); sbuff = devip->sense_buff; if ((cmd[1] & 1) && (! scsi_debug_dsense)) { /* DESC bit set and sense_buff in fixed format */ arr[0] = 0x72; arr[1] = sbuff[2]; /* sense key */ arr[2] = sbuff[12]; /* asc */ arr[3] = sbuff[13]; /* ascq */ len = 8; } else memcpy(arr, sbuff, SDEBUG_SENSE_LEN); mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0); return fill_from_dev_buffer(scp, arr, len); } #define SDEBUG_READCAP_ARR_SZ 8 static int resp_readcap(struct scsi_cmnd * scp, struct sdebug_dev_info * devip) { unsigned char arr[SDEBUG_READCAP_ARR_SZ]; unsigned long capac; int errsts; if ((errsts = check_reset(scp, devip))) return errsts; memset(arr, 0, SDEBUG_READCAP_ARR_SZ); capac = (unsigned long)sdebug_capacity - 1; arr[0] = (capac >> 24); arr[1] = (capac >> 16) & 0xff; arr[2] = (capac >> 8) & 0xff; arr[3] = capac & 0xff; arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff; arr[7] = SECT_SIZE_PER(target) & 0xff; return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ); } /* <<Following mode page info copied from ST318451LW>> */ static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target) { /* Read-Write Error Recovery page for mode_sense */ unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0, 5, 0, 0xff, 0xff}; memcpy(p, err_recov_pg, sizeof(err_recov_pg)); if (1 == pcontrol) memset(p + 2, 0, sizeof(err_recov_pg) - 2); return sizeof(err_recov_pg); } static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target) { /* Disconnect-Reconnect page for mode_sense */ unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; memcpy(p, disconnect_pg, sizeof(disconnect_pg)); if (1 == pcontrol) memset(p + 2, 0, sizeof(disconnect_pg) - 2); return sizeof(disconnect_pg); } static int resp_format_pg(unsigned char * p, int pcontrol, int target) { /* Format device page for mode_sense */ unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x40, 0, 0, 0}; memcpy(p, format_pg, sizeof(format_pg)); p[10] = (sdebug_sectors_per >> 8) & 0xff; p[11] = sdebug_sectors_per & 0xff; p[12] = (SECT_SIZE >> 8) & 0xff; p[13] = SECT_SIZE & 0xff; if (DEV_REMOVEABLE(target)) p[20] |= 0x20; /* should agree with INQUIRY */ if (1 == pcontrol) memset(p + 2, 0, sizeof(format_pg) - 2); return sizeof(format_pg); } static int resp_caching_pg(unsigned char * p, int pcontrol, int target) { /* Caching page for mode_sense */ unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0}; memcpy(p, caching_pg, sizeof(caching_pg)); if (1 == pcontrol) memset(p + 2, 0, sizeof(caching_pg) - 2); return sizeof(caching_pg); } static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target) { /* Control mode page for mode_sense */ unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, 0, 0, 0x2, 0x4b}; if (scsi_debug_dsense) ctrl_m_pg[2] |= 0x4; memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg)); if (1 == pcontrol) memset(p + 2, 0, sizeof(ctrl_m_pg) - 2); return sizeof(ctrl_m_pg); } static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target) { /* Informational Exceptions control mode page for mode_sense */ unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, 0, 0, 0x0, 0x0}; memcpy(p, iec_m_pg, sizeof(iec_m_pg)); if (1 == pcontrol) memset(p + 2, 0, sizeof(iec_m_pg) - 2); return sizeof(iec_m_pg); } #define SDEBUG_MAX_MSENSE_SZ 256 static int resp_mode_sense(struct scsi_cmnd * scp, int target, struct sdebug_dev_info * devip) { unsigned char dbd; int pcontrol, pcode, subpcode; unsigned char dev_spec; int alloc_len, msense_6, offset, len, errsts; unsigned char * ap; unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; unsigned char *cmd = (unsigned char *)scp->cmnd; if ((errsts = check_reset(scp, devip))) return errsts; dbd = cmd[1] & 0x8; pcontrol = (cmd[2] & 0xc0) >> 6; pcode = cmd[2] & 0x3f; subpcode = cmd[3]; msense_6 = (MODE_SENSE == cmd[0]); alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]); memset(arr, 0, SDEBUG_MAX_MSENSE_SZ); if (0x3 == pcontrol) { /* Saving values not supported */ mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 0); return check_condition_result; } dev_spec = DEV_READONLY(target) ? 0x80 : 0x0; if (msense_6) { arr[2] = dev_spec; offset = 4; } else { arr[3] = dev_spec; offset = 8; } ap = arr + offset; if (0 != subpcode) { /* TODO: Control Extension page */ mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); return check_condition_result; } switch (pcode) { case 0x1: /* Read-Write error recovery page, direct access */ len = resp_err_recov_pg(ap, pcontrol, target); offset += len; break; case 0x2: /* Disconnect-Reconnect page, all devices */ len = resp_disconnect_pg(ap, pcontrol, target); offset += len; break; case 0x3: /* Format device page, direct access */ len = resp_format_pg(ap, pcontrol, target); offset += len; break; case 0x8: /* Caching page, direct access */ len = resp_caching_pg(ap, pcontrol, target); offset += len; break; case 0xa: /* Control Mode page, all devices */ len = resp_ctrl_m_pg(ap, pcontrol, target); offset += len; break; case 0x1c: /* Informational Exceptions Mode page, all devices */ len = resp_iec_m_pg(ap, pcontrol, target); offset += len; break; case 0x3f: /* Read all Mode pages */ len = resp_err_recov_pg(ap, pcontrol, target); len += resp_disconnect_pg(ap + len, pcontrol, target); len += resp_format_pg(ap + len, pcontrol, target); len += resp_caching_pg(ap + len, pcontrol, target); len += resp_ctrl_m_pg(ap + len, pcontrol, target); len += resp_iec_m_pg(ap + len, pcontrol, target); offset += len; break; default: mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); return check_condition_result; } if (msense_6) arr[0] = offset - 1; else { arr[0] = ((offset - 2) >> 8) & 0xff; arr[1] = (offset - 2) & 0xff; } return fill_from_dev_buffer(scp, arr, min(alloc_len, offset)); } static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block, int num, struct sdebug_dev_info * devip) { unsigned long iflags; int ret; if (upper_blk || (block + num > sdebug_capacity)) { mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0); return check_condition_result; } if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) && (block <= OPT_MEDIUM_ERR_ADDR) && ((block + num) > OPT_MEDIUM_ERR_ADDR)) { mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0); /* claim unrecoverable read error */ return check_condition_result; } read_lock_irqsave(&atomic_rw, iflags); ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), num * SECT_SIZE); read_unlock_irqrestore(&atomic_rw, iflags); return ret; } static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block, int num, struct sdebug_dev_info * devip) { unsigned long iflags; int res; if (upper_blk || (block + num > sdebug_capacity)) { mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0); return check_condition_result; } write_lock_irqsave(&atomic_rw, iflags); res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE), num * SECT_SIZE); write_unlock_irqrestore(&atomic_rw, iflags); if (-1 == res) return (DID_ERROR << 16); else if ((res < (num * SECT_SIZE)) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, " " IO sent=%d bytes\n", num * SECT_SIZE, res); return 0; } #define SDEBUG_RLUN_ARR_SZ 128 static int resp_report_luns(struct scsi_cmnd * scp, struct sdebug_dev_info * devip) { unsigned int alloc_len; int lun_cnt, i, upper; unsigned char *cmd = (unsigned char *)scp->cmnd; int select_report = (int)cmd[2]; struct scsi_lun *one_lun; unsigned char arr[SDEBUG_RLUN_ARR_SZ]; alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); if ((alloc_len < 16) || (select_report > 2)) { mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); return check_condition_result; } /* can produce response with up to 16k luns (lun 0 to lun 16383) */ memset(arr, 0, SDEBUG_RLUN_ARR_SZ); lun_cnt = scsi_debug_max_luns; arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff; arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff; lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) / sizeof(struct scsi_lun)), lun_cnt); one_lun = (struct scsi_lun *) &arr[8]; for (i = 0; i < lun_cnt; i++) { upper = (i >> 8) & 0x3f; if (upper) one_lun[i].scsi_lun[0] = (upper | (SAM2_LUN_ADDRESS_METHOD << 6)); one_lun[i].scsi_lun[1] = i & 0xff; } return fill_from_dev_buffer(scp, arr, min((int)alloc_len, SDEBUG_RLUN_ARR_SZ)); } /* When timer goes off this function is called. */ static void timer_intr_handler(unsigned long indx) { struct sdebug_queued_cmd * sqcp; unsigned long iflags; if (indx >= SCSI_DEBUG_CANQUEUE) { printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too " "large\n"); return; } spin_lock_irqsave(&queued_arr_lock, iflags); sqcp = &queued_arr[(int)indx]; if (! sqcp->in_use) { printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected " "interrupt\n"); spin_unlock_irqrestore(&queued_arr_lock, iflags); return; } sqcp->in_use = 0; if (sqcp->done_funct) { sqcp->a_cmnd->result = sqcp->scsi_result; sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */ } sqcp->done_funct = NULL; spin_unlock_irqrestore(&queued_arr_lock, iflags); } static int scsi_debug_slave_alloc(struct scsi_device * sdp) { if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_alloc\n"); return 0; } static int scsi_debug_slave_configure(struct scsi_device * sdp) { struct sdebug_dev_info * devip; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_configure\n"); if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN) sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN; devip = devInfoReg(sdp); sdp->hostdata = devip; if (sdp->host->cmd_per_lun) scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING, sdp->host->cmd_per_lun); return 0; } static void scsi_debug_slave_destroy(struct scsi_device * sdp) { struct sdebug_dev_info * devip = (struct sdebug_dev_info *)sdp->hostdata; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_destroy\n"); if (devip) { /* make this slot avaliable for re-use */ devip->used = 0; sdp->hostdata = NULL; } } static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev) { struct sdebug_host_info * sdbg_host; struct sdebug_dev_info * open_devip = NULL; struct sdebug_dev_info * devip = (struct sdebug_dev_info *)sdev->hostdata; if (devip) return devip; sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata; if(! sdbg_host) { printk(KERN_ERR "Host info NULL\n"); return NULL; } list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { if ((devip->used) && (devip->channel == sdev->channel) && (devip->target == sdev->id) && (devip->lun == sdev->lun)) return devip; else { if ((!devip->used) && (!open_devip)) open_devip = devip; } } if (NULL == open_devip) { /* try and make a new one */ open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL); if (NULL == open_devip) { printk(KERN_ERR "%s: out of memory at line %d\n", __FUNCTION__, __LINE__); return NULL; } memset(open_devip, 0, sizeof(*open_devip)); open_devip->sdbg_host = sdbg_host; list_add_tail(&open_devip->dev_list, &sdbg_host->dev_info_list); } if (open_devip) { open_devip->channel = sdev->channel; open_devip->target = sdev->id; open_devip->lun = sdev->lun; open_devip->sdbg_host = sdbg_host; open_devip->reset = 1; open_devip->used = 1; memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN); if (scsi_debug_dsense) open_devip->sense_buff[0] = 0x72; else { open_devip->sense_buff[0] = 0x70; open_devip->sense_buff[7] = 0xa; } return open_devip; } return NULL; } static void mk_sense_buffer(struct sdebug_dev_info * devip, int key, int asc, int asq) { unsigned char * sbuff; sbuff = devip->sense_buff; memset(sbuff, 0, SDEBUG_SENSE_LEN); if (scsi_debug_dsense) { sbuff[0] = 0x72; /* descriptor, current */ sbuff[1] = key; sbuff[2] = asc; sbuff[3] = asq; } else { sbuff[0] = 0x70; /* fixed, current */ sbuff[2] = key; sbuff[7] = 0xa; /* implies 18 byte sense buffer */ sbuff[12] = asc; sbuff[13] = asq; } if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: [sense_key,asc,ascq]: " "[0x%x,0x%x,0x%x]\n", key, asc, asq); } static int scsi_debug_abort(struct scsi_cmnd * SCpnt) { if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: abort\n"); ++num_aborts; stop_queued_cmnd(SCpnt); return SUCCESS; } static int scsi_debug_biosparam(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) { int res; unsigned char *buf; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: biosparam\n"); buf = scsi_bios_ptable(bdev); if (buf) { res = scsi_partsize(buf, capacity, &info[2], &info[0], &info[1]); kfree(buf); if (! res) return res; } info[0] = sdebug_heads; info[1] = sdebug_sectors_per; info[2] = sdebug_cylinders_per; return 0; } static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt) { struct sdebug_dev_info * devip; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: device_reset\n"); ++num_dev_resets; if (SCpnt) { devip = devInfoReg(SCpnt->device); if (devip) devip->reset = 1; } return SUCCESS; } static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt) { struct sdebug_host_info *sdbg_host; struct sdebug_dev_info * dev_info; struct scsi_device * sdp; struct Scsi_Host * hp; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: bus_reset\n"); ++num_bus_resets; if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) { sdbg_host = *(struct sdebug_host_info **) hp->hostdata; if (sdbg_host) { list_for_each_entry(dev_info, &sdbg_host->dev_info_list, dev_list) dev_info->reset = 1; } } return SUCCESS; } static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt) { struct sdebug_host_info * sdbg_host; struct sdebug_dev_info * dev_info; if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: host_reset\n"); ++num_host_resets; spin_lock(&sdebug_host_list_lock); list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { list_for_each_entry(dev_info, &sdbg_host->dev_info_list, dev_list) dev_info->reset = 1; } spin_unlock(&sdebug_host_list_lock); stop_all_queued(); return SUCCESS; } /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */ static int stop_queued_cmnd(struct scsi_cmnd * cmnd) { unsigned long iflags; int k; struct sdebug_queued_cmd * sqcp; spin_lock_irqsave(&queued_arr_lock, iflags); for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { sqcp = &queued_arr[k]; if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) { del_timer_sync(&sqcp->cmnd_timer); sqcp->in_use = 0; sqcp->a_cmnd = NULL; break; } } spin_unlock_irqrestore(&queued_arr_lock, iflags); return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0; } /* Deletes (stops) timers of all queued commands */ static void stop_all_queued(void) { unsigned long iflags; int k; struct sdebug_queued_cmd * sqcp; spin_lock_irqsave(&queued_arr_lock, iflags); for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { sqcp = &queued_arr[k]; if (sqcp->in_use && sqcp->a_cmnd) { del_timer_sync(&sqcp->cmnd_timer); sqcp->in_use = 0; sqcp->a_cmnd = NULL; } } spin_unlock_irqrestore(&queued_arr_lock, iflags); } /* Initializes timers in queued array */ static void __init init_all_queued(void) { unsigned long iflags; int k; struct sdebug_queued_cmd * sqcp; spin_lock_irqsave(&queued_arr_lock, iflags); for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { sqcp = &queued_arr[k]; init_timer(&sqcp->cmnd_timer); sqcp->in_use = 0; sqcp->a_cmnd = NULL; } spin_unlock_irqrestore(&queued_arr_lock, iflags); } static void __init sdebug_build_parts(unsigned char * ramp) { struct partition * pp; int starts[SDEBUG_MAX_PARTS + 2]; int sectors_per_part, num_sectors, k; int heads_by_sects, start_sec, end_sec; /* assume partition table already zeroed */ if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576)) return; if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) { scsi_debug_num_parts = SDEBUG_MAX_PARTS; printk(KERN_WARNING "scsi_debug:build_parts: reducing " "partitions to %d\n", SDEBUG_MAX_PARTS); } num_sectors = (int)(sdebug_store_size / SECT_SIZE); sectors_per_part = (num_sectors - sdebug_sectors_per) / scsi_debug_num_parts; heads_by_sects = sdebug_heads * sdebug_sectors_per; starts[0] = sdebug_sectors_per; for (k = 1; k < scsi_debug_num_parts; ++k) starts[k] = ((k * sectors_per_part) / heads_by_sects) * heads_by_sects; starts[scsi_debug_num_parts] = num_sectors; starts[scsi_debug_num_parts + 1] = 0; ramp[510] = 0x55; /* magic partition markings */ ramp[511] = 0xAA; pp = (struct partition *)(ramp + 0x1be); for (k = 0; starts[k + 1]; ++k, ++pp) { start_sec = starts[k]; end_sec = starts[k + 1] - 1; pp->boot_ind = 0; pp->cyl = start_sec / heads_by_sects; pp->head = (start_sec - (pp->cyl * heads_by_sects)) / sdebug_sectors_per; pp->sector = (start_sec % sdebug_sectors_per) + 1; pp->end_cyl = end_sec / heads_by_sects; pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects)) / sdebug_sectors_per; pp->end_sector = (end_sec % sdebug_sectors_per) + 1; pp->start_sect = start_sec; pp->nr_sects = end_sec - start_sec + 1; pp->sys_ind = 0x83; /* plain Linux partition */ } } static int schedule_resp(struct scsi_cmnd * cmnd, struct sdebug_dev_info * devip, done_funct_t done, int scsi_result, int delta_jiff) { if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) { if (scsi_result) { struct scsi_device * sdp = cmnd->device; sdev_printk(KERN_INFO, sdp, "non-zero result=0x%x\n", scsi_result); } } if (cmnd && devip) { /* simulate autosense by this driver */ if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff)) memcpy(cmnd->sense_buffer, devip->sense_buff, (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ? SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE); } if (delta_jiff <= 0) { if (cmnd) cmnd->result = scsi_result; if (done) done(cmnd); return 0; } else { unsigned long iflags; int k; struct sdebug_queued_cmd * sqcp = NULL; spin_lock_irqsave(&queued_arr_lock, iflags); for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { sqcp = &queued_arr[k]; if (! sqcp->in_use) break; } if (k >= SCSI_DEBUG_CANQUEUE) { spin_unlock_irqrestore(&queued_arr_lock, iflags); printk(KERN_WARNING "scsi_debug: can_queue exceeded\n"); return 1; /* report busy to mid level */ } sqcp->in_use = 1; sqcp->a_cmnd = cmnd; sqcp->scsi_result = scsi_result; sqcp->done_funct = done; sqcp->cmnd_timer.function = timer_intr_handler; sqcp->cmnd_timer.data = k; sqcp->cmnd_timer.expires = jiffies + delta_jiff; add_timer(&sqcp->cmnd_timer); spin_unlock_irqrestore(&queued_arr_lock, iflags); if (cmnd) cmnd->result = 0; return 0; } } /* Set 'perm' (4th argument) to 0 to disable module_param's definition * of sysfs parameters (which module_param doesn't yet support). * Sysfs parameters defined explicitly below. */ module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */ module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */ module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0); module_param_named(dsense, scsi_debug_dsense, int, 0); module_param_named(every_nth, scsi_debug_every_nth, int, 0); module_param_named(max_luns, scsi_debug_max_luns, int, 0); module_param_named(num_parts, scsi_debug_num_parts, int, 0); module_param_named(num_tgts, scsi_debug_num_tgts, int, 0); module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */ module_param_named(ptype, scsi_debug_ptype, int, 0); module_param_named(scsi_level, scsi_debug_scsi_level, int, 0); MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert"); MODULE_DESCRIPTION("SCSI debug adapter driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(SCSI_DEBUG_VERSION); MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)"); MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs"); MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)"); MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)"); MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate"); MODULE_PARM_DESC(num_parts, "number of partitions(def=0)"); MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate"); MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->..."); MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])"); static char sdebug_info[256]; static const char * scsi_debug_info(struct Scsi_Host * shp) { sprintf(sdebug_info, "scsi_debug, version %s [%s], " "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_dev_size_mb, scsi_debug_opts); return sdebug_info; } /* scsi_debug_proc_info * Used if the driver currently has no own support for /proc/scsi */ static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) { int len, pos, begin; int orig_length; orig_length = length; if (inout == 1) { char arr[16]; int minLen = length > 15 ? 15 : length; if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) return -EACCES; memcpy(arr, buffer, minLen); arr[minLen] = '\0'; if (1 != sscanf(arr, "%d", &pos)) return -EINVAL; scsi_debug_opts = pos; if (scsi_debug_every_nth != 0) scsi_debug_cmnd_count = 0; return length; } begin = 0; pos = len = sprintf(buffer, "scsi_debug adapter driver, version " "%s [%s]\n" "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, " "every_nth=%d(curr:%d)\n" "delay=%d, max_luns=%d, scsi_level=%d\n" "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n" "number of aborts=%d, device_reset=%d, bus_resets=%d, " "host_resets=%d\n", SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts, scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth, scsi_debug_cmnd_count, scsi_debug_delay, scsi_debug_max_luns, scsi_debug_scsi_level, SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets, num_host_resets); if (pos < offset) { len = 0; begin = pos; } *start = buffer + (offset - begin); /* Start of wanted data */ len -= (offset - begin); if (len > length) len = length; return len; } static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay); } static ssize_t sdebug_delay_store(struct device_driver * ddp, const char * buf, size_t count) { int delay; char work[20]; if (1 == sscanf(buf, "%10s", work)) { if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) { scsi_debug_delay = delay; return count; } } return -EINVAL; } DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show, sdebug_delay_store); static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts); } static ssize_t sdebug_opts_store(struct device_driver * ddp, const char * buf, size_t count) { int opts; char work[20]; if (1 == sscanf(buf, "%10s", work)) { if (0 == strnicmp(work,"0x", 2)) { if (1 == sscanf(&work[2], "%x", &opts)) goto opts_done; } else { if (1 == sscanf(work, "%d", &opts)) goto opts_done; } } return -EINVAL; opts_done: scsi_debug_opts = opts; scsi_debug_cmnd_count = 0; return count; } DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show, sdebug_opts_store); static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype); } static ssize_t sdebug_ptype_store(struct device_driver * ddp, const char * buf, size_t count) { int n; if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { scsi_debug_ptype = n; return count; } return -EINVAL; } DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store); static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense); } static ssize_t sdebug_dsense_store(struct device_driver * ddp, const char * buf, size_t count) { int n; if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { scsi_debug_dsense = n; return count; } return -EINVAL; } DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show, sdebug_dsense_store); static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts); } static ssize_t sdebug_num_tgts_store(struct device_driver * ddp, const char * buf, size_t count) { int n; if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { scsi_debug_num_tgts = n; sdebug_max_tgts_luns(); return count; } return -EINVAL; } DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show, sdebug_num_tgts_store); static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb); } DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL); static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts); } DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL); static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth); } static ssize_t sdebug_every_nth_store(struct device_driver * ddp, const char * buf, size_t count) { int nth; if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) { scsi_debug_every_nth = nth; scsi_debug_cmnd_count = 0; return count; } return -EINVAL; } DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show, sdebug_every_nth_store); static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns); } static ssize_t sdebug_max_luns_store(struct device_driver * ddp, const char * buf, size_t count) { int n; if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { scsi_debug_max_luns = n; sdebug_max_tgts_luns(); return count; } return -EINVAL; } DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show, sdebug_max_luns_store); static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level); } DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL); static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host); } static ssize_t sdebug_add_host_store(struct device_driver * ddp, const char * buf, size_t count) { int delta_hosts; char work[20]; if (1 != sscanf(buf, "%10s", work)) return -EINVAL; { /* temporary hack around sscanf() problem with -ve nums */ int neg = 0; if ('-' == *work) neg = 1; if (1 != sscanf(work + neg, "%d", &delta_hosts)) return -EINVAL; if (neg) delta_hosts = -delta_hosts; } if (delta_hosts > 0) { do { sdebug_add_adapter(); } while (--delta_hosts); } else if (delta_hosts < 0) { do { sdebug_remove_adapter(); } while (++delta_hosts); } return count; } DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show, sdebug_add_host_store); static void do_create_driverfs_files(void) { driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host); driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay); driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense); driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth); driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns); driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts); driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype); driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts); driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); } static void do_remove_driverfs_files(void) { driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay); driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host); } static int __init scsi_debug_init(void) { unsigned long sz; int host_to_add; int k; if (scsi_debug_dev_size_mb < 1) scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */ sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576; sdebug_capacity = sdebug_store_size / SECT_SIZE; /* play around with geometry, don't waste too much on track 0 */ sdebug_heads = 8; sdebug_sectors_per = 32; if (scsi_debug_dev_size_mb >= 16) sdebug_heads = 32; else if (scsi_debug_dev_size_mb >= 256) sdebug_heads = 64; sdebug_cylinders_per = (unsigned long)sdebug_capacity / (sdebug_sectors_per * sdebug_heads); if (sdebug_cylinders_per >= 1024) { /* other LLDs do this; implies >= 1GB ram disk ... */ sdebug_heads = 255; sdebug_sectors_per = 63; sdebug_cylinders_per = (unsigned long)sdebug_capacity / (sdebug_sectors_per * sdebug_heads); } sz = sdebug_store_size; fake_storep = vmalloc(sz); if (NULL == fake_storep) { printk(KERN_ERR "scsi_debug_init: out of memory, 1\n"); return -ENOMEM; } memset(fake_storep, 0, sz); if (scsi_debug_num_parts > 0) sdebug_build_parts(fake_storep); init_all_queued(); device_register(&pseudo_primary); bus_register(&pseudo_lld_bus); driver_register(&sdebug_driverfs_driver); do_create_driverfs_files(); sdebug_driver_template.proc_name = (char *)sdebug_proc_name; host_to_add = scsi_debug_add_host; scsi_debug_add_host = 0; for (k = 0; k < host_to_add; k++) { if (sdebug_add_adapter()) { printk(KERN_ERR "scsi_debug_init: " "sdebug_add_adapter failed k=%d\n", k); break; } } if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { printk(KERN_INFO "scsi_debug_init: built %d host(s)\n", scsi_debug_add_host); } return 0; } static void __exit scsi_debug_exit(void) { int k = scsi_debug_add_host; stop_all_queued(); for (; k; k--) sdebug_remove_adapter(); do_remove_driverfs_files(); driver_unregister(&sdebug_driverfs_driver); bus_unregister(&pseudo_lld_bus); device_unregister(&pseudo_primary); vfree(fake_storep); } device_initcall(scsi_debug_init); module_exit(scsi_debug_exit); static void pseudo_0_release(struct device * dev) { if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n"); } static struct device pseudo_primary = { .bus_id = "pseudo_0", .release = pseudo_0_release, }; static int pseudo_lld_bus_match(struct device *dev, struct device_driver *dev_driver) { return 1; } static struct bus_type pseudo_lld_bus = { .name = "pseudo", .match = pseudo_lld_bus_match, }; static void sdebug_release_adapter(struct device * dev) { struct sdebug_host_info *sdbg_host; sdbg_host = to_sdebug_host(dev); kfree(sdbg_host); } static int sdebug_add_adapter(void) { int k, devs_per_host; int error = 0; struct sdebug_host_info *sdbg_host; struct sdebug_dev_info *sdbg_devinfo; struct list_head *lh, *lh_sf; sdbg_host = kmalloc(sizeof(*sdbg_host),GFP_KERNEL); if (NULL == sdbg_host) { printk(KERN_ERR "%s: out of memory at line %d\n", __FUNCTION__, __LINE__); return -ENOMEM; } memset(sdbg_host, 0, sizeof(*sdbg_host)); INIT_LIST_HEAD(&sdbg_host->dev_info_list); devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns; for (k = 0; k < devs_per_host; k++) { sdbg_devinfo = kmalloc(sizeof(*sdbg_devinfo),GFP_KERNEL); if (NULL == sdbg_devinfo) { printk(KERN_ERR "%s: out of memory at line %d\n", __FUNCTION__, __LINE__); error = -ENOMEM; goto clean; } memset(sdbg_devinfo, 0, sizeof(*sdbg_devinfo)); sdbg_devinfo->sdbg_host = sdbg_host; list_add_tail(&sdbg_devinfo->dev_list, &sdbg_host->dev_info_list); } spin_lock(&sdebug_host_list_lock); list_add_tail(&sdbg_host->host_list, &sdebug_host_list); spin_unlock(&sdebug_host_list_lock); sdbg_host->dev.bus = &pseudo_lld_bus; sdbg_host->dev.parent = &pseudo_primary; sdbg_host->dev.release = &sdebug_release_adapter; sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host); error = device_register(&sdbg_host->dev); if (error) goto clean; ++scsi_debug_add_host; return error; clean: list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, dev_list); list_del(&sdbg_devinfo->dev_list); kfree(sdbg_devinfo); } kfree(sdbg_host); return error; } static void sdebug_remove_adapter(void) { struct sdebug_host_info * sdbg_host = NULL; spin_lock(&sdebug_host_list_lock); if (!list_empty(&sdebug_host_list)) { sdbg_host = list_entry(sdebug_host_list.prev, struct sdebug_host_info, host_list); list_del(&sdbg_host->host_list); } spin_unlock(&sdebug_host_list_lock); if (!sdbg_host) return; device_unregister(&sdbg_host->dev); --scsi_debug_add_host; } static int sdebug_driver_probe(struct device * dev) { int error = 0; struct sdebug_host_info *sdbg_host; struct Scsi_Host *hpnt; sdbg_host = to_sdebug_host(dev); hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); if (NULL == hpnt) { printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__); error = -ENODEV; return error; } sdbg_host->shost = hpnt; *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id)) hpnt->max_id = scsi_debug_num_tgts + 1; else hpnt->max_id = scsi_debug_num_tgts; hpnt->max_lun = scsi_debug_max_luns; error = scsi_add_host(hpnt, &sdbg_host->dev); if (error) { printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__); error = -ENODEV; scsi_host_put(hpnt); } else scsi_scan_host(hpnt); return error; } static int sdebug_driver_remove(struct device * dev) { struct list_head *lh, *lh_sf; struct sdebug_host_info *sdbg_host; struct sdebug_dev_info *sdbg_devinfo; sdbg_host = to_sdebug_host(dev); if (!sdbg_host) { printk(KERN_ERR "%s: Unable to locate host info\n", __FUNCTION__); return -ENODEV; } scsi_remove_host(sdbg_host->shost); list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) { sdbg_devinfo = list_entry(lh, struct sdebug_dev_info, dev_list); list_del(&sdbg_devinfo->dev_list); kfree(sdbg_devinfo); } scsi_host_put(sdbg_host->shost); return 0; } static void sdebug_max_tgts_luns(void) { struct sdebug_host_info * sdbg_host; struct Scsi_Host *hpnt; spin_lock(&sdebug_host_list_lock); list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { hpnt = sdbg_host->shost; if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id)) hpnt->max_id = scsi_debug_num_tgts + 1; else hpnt->max_id = scsi_debug_num_tgts; hpnt->max_lun = scsi_debug_max_luns; } spin_unlock(&sdebug_host_list_lock); }