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OpenCloudOS-Kernel/drivers/scsi/scsi_debug.c

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/*
* 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>
#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 struct 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,
};
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 = kzalloc(sizeof(*open_devip),GFP_KERNEL);
if (NULL == open_devip) {
printk(KERN_ERR "%s: out of memory at line %d\n",
__FUNCTION__, __LINE__);
return NULL;
}
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,
.probe = sdebug_driver_probe,
.remove = sdebug_driver_remove,
};
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 = kzalloc(sizeof(*sdbg_host), GFP_KERNEL);
if (NULL == sdbg_host) {
printk(KERN_ERR "%s: out of memory at line %d\n",
__FUNCTION__, __LINE__);
return -ENOMEM;
}
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 = kzalloc(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;
}
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);
}
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