diff options
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 1976 |
1 files changed, 1976 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c new file mode 100644 index 00000000000..e0208886b45 --- /dev/null +++ b/drivers/scsi/scsi_debug.c @@ -0,0 +1,1976 @@ +/* + * 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 = SCpnt->device->id; + 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) + printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + 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) + printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + 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) + printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + 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; + + printk(KERN_INFO "scsi_debug: <%u %u %u %u> " + "non-zero result=0x%x\n", sdp->host->host_no, + sdp->channel, sdp->id, sdp->lun, 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); + +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); +} |