scsi_debug.c 95.7 KB
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/*
 * 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
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 *  (or disk like devices) sharing a common amount of RAM. To be more
 *  realistic, the simulated devices have the transport attributes of
 *  SAS disks.
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 *
 *
 *  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/module.h>

#include <linux/kernel.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/vmalloc.h>
#include <linux/moduleparam.h>
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#include <linux/scatterlist.h>
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#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"

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#define SCSI_DEBUG_VERSION "1.81"
static const char * scsi_debug_version_date = "20070104";
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/* Additional Sense Code (ASC) */
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#define NO_ADDITIONAL_SENSE 0x0
#define LOGICAL_UNIT_NOT_READY 0x4
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#define UNRECOVERED_READ_ERR 0x11
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#define PARAMETER_LIST_LENGTH_ERR 0x1a
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#define INVALID_OPCODE 0x20
#define ADDR_OUT_OF_RANGE 0x21
#define INVALID_FIELD_IN_CDB 0x24
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#define INVALID_FIELD_IN_PARAM_LIST 0x26
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#define POWERON_RESET 0x29
#define SAVING_PARAMS_UNSUP 0x39
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#define TRANSPORT_PROBLEM 0x4b
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#define THRESHOLD_EXCEEDED 0x5d
#define LOW_POWER_COND_ON 0x5e
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/* Additional Sense Code Qualifier (ASCQ) */
#define ACK_NAK_TO 0x3

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#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
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#define DEF_NO_LUN_0   0
#define DEF_VIRTUAL_GB   0
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#define DEF_FAKE_RW	0
#define DEF_VPD_USE_HOSTNO 1
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/* 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
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#define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
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/* 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.
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 *   - a TRANSPORT_ERROR is simulated on successful read and write
 *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
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 *
 * 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.
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 *   - a TRANSPORT_ERROR is simulated on successful read and write
 *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
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 * 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
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#define SAM2_WLUN_REPORT_LUNS 0xc101
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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;
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static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
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static int scsi_debug_fake_rw = DEF_FAKE_RW;
static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
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static int scsi_debug_cmnd_count = 0;

#define DEV_READONLY(TGT)      (0)
#define DEV_REMOVEABLE(TGT)    (0)

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static unsigned int sdebug_store_size;	/* in bytes */
static unsigned int sdebug_store_sectors;
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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;
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	unsigned int wlun;
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	char reset;
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	char stopped;
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	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];

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static struct scsi_host_template sdebug_driver_template = {
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	.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,
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	.sg_tablesize =		256,
	.cmd_per_lun =		16,
	.max_sectors =		0xffff,
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	.unchecked_isa_dma = 	0,
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	.use_clustering = 	DISABLE_CLUSTERING,
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	.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;

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static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
				    0, 0, 0x2, 0x4b};
static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
			           0, 0, 0x0, 0x0};

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/* 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);
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static int resp_start_stop(struct scsi_cmnd * scp,
			   struct sdebug_dev_info * devip);
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static int resp_report_tgtpgs(struct scsi_cmnd * scp,
			      struct sdebug_dev_info * devip);
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static int resp_readcap(struct scsi_cmnd * SCpnt,
			struct sdebug_dev_info * devip);
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static int resp_readcap16(struct scsi_cmnd * SCpnt,
			  struct sdebug_dev_info * devip);
static int resp_mode_sense(struct scsi_cmnd * scp, int target,
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			   struct sdebug_dev_info * devip);
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static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
			    struct sdebug_dev_info * devip);
static int resp_log_sense(struct scsi_cmnd * scp,
			  struct sdebug_dev_info * devip);
static int resp_read(struct scsi_cmnd * SCpnt, unsigned long long lba,
		     unsigned int num, struct sdebug_dev_info * devip);
static int resp_write(struct scsi_cmnd * SCpnt, unsigned long long lba,
		      unsigned int num, struct sdebug_dev_info * devip);
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static int resp_report_luns(struct scsi_cmnd * SCpnt,
			    struct sdebug_dev_info * devip);
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static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
			    unsigned int num, struct sdebug_dev_info *devip);
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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);
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static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
			   struct sdebug_dev_info * devip);
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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);
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static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
			   int target_dev_id, int dev_id_num,
			   const char * dev_id_str, int dev_id_str_len);
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static int inquiry_evpd_88(unsigned char * arr, int target_dev_id);
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static int do_create_driverfs_files(void);
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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;

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static void get_data_transfer_info(unsigned char *cmd,
				   unsigned long long *lba, unsigned int *num)
{
	int i;

	switch (*cmd) {
	case WRITE_16:
	case READ_16:
		for (*lba = 0, i = 0; i < 8; ++i) {
			if (i > 0)
				*lba <<= 8;
			*lba += cmd[2 + i];
		}
		*num = cmd[13] + (cmd[12] << 8) +
			(cmd[11] << 16) + (cmd[10] << 24);
		break;
	case WRITE_12:
	case READ_12:
		*lba = cmd[5] + (cmd[4] << 8) +	(cmd[3] << 16) + (cmd[2] << 24);
		*num = cmd[9] + (cmd[8] << 8) +	(cmd[7] << 16) + (cmd[6] << 24);
		break;
	case WRITE_10:
	case READ_10:
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	case XDWRITEREAD_10:
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		*lba = cmd[5] + (cmd[4] << 8) +	(cmd[3] << 16) + (cmd[2] << 24);
		*num = cmd[8] + (cmd[7] << 8);
		break;
	case WRITE_6:
	case READ_6:
		*lba = cmd[3] + (cmd[2] << 8) + ((cmd[1] & 0x1f) << 16);
		*num = (0 == cmd[4]) ? 256 : cmd[4];
		break;
	default:
		break;
	}
}
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static
int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
{
	unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
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	int len, k;
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	unsigned int num;
	unsigned long long lba;
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	int errsts = 0;
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	int target = SCpnt->device->id;
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	struct sdebug_dev_info * devip = NULL;
	int inj_recovered = 0;
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	int inj_transport = 0;
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	int delay_override = 0;
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	if (done == NULL)
		return 0;	/* assume mid level reprocessing command */

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	scsi_set_resid(SCpnt, 0);
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	if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
		printk(KERN_INFO "scsi_debug: cmd ");
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		for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
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			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);
        }

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	if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
	    (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
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		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 */
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		else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
			inj_transport = 1; /* to reads and writes below */
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        }

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	if (devip->wlun) {
		switch (*cmd) {
		case INQUIRY:
		case REQUEST_SENSE:
		case TEST_UNIT_READY:
		case REPORT_LUNS:
			break;  /* only allowable wlun commands */
		default:
			if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
				printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
				       "not supported for wlun\n", *cmd);
			mk_sense_buffer(devip, ILLEGAL_REQUEST,
					INVALID_OPCODE, 0);
			errsts = check_condition_result;
			return schedule_resp(SCpnt, devip, done, errsts,
					     0);
		}
	}

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	switch (*cmd) {
	case INQUIRY:     /* mandatory, ignore unit attention */
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		delay_override = 1;
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		errsts = resp_inquiry(SCpnt, target, devip);
		break;
	case REQUEST_SENSE:	/* mandatory, ignore unit attention */
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		delay_override = 1;
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		errsts = resp_requests(SCpnt, devip);
		break;
	case REZERO_UNIT:	/* actually this is REWIND for SSC */
	case START_STOP:
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		errsts = resp_start_stop(SCpnt, devip);
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		break;
	case ALLOW_MEDIUM_REMOVAL:
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		if ((errsts = check_readiness(SCpnt, 1, devip)))
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			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 */
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		errsts = check_readiness(SCpnt, 1, devip);
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		break;
	case TEST_UNIT_READY:     /* mandatory */
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		delay_override = 1;
		errsts = check_readiness(SCpnt, 0, devip);
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		break;
        case RESERVE:
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		errsts = check_readiness(SCpnt, 1, devip);
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                break;
        case RESERVE_10:
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		errsts = check_readiness(SCpnt, 1, devip);
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                break;
        case RELEASE:
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		errsts = check_readiness(SCpnt, 1, devip);
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                break;
        case RELEASE_10:
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		errsts = check_readiness(SCpnt, 1, devip);
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                break;
	case READ_CAPACITY:
		errsts = resp_readcap(SCpnt, devip);
		break;
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	case SERVICE_ACTION_IN:
		if (SAI_READ_CAPACITY_16 != cmd[1]) {
			mk_sense_buffer(devip, ILLEGAL_REQUEST,
					INVALID_OPCODE, 0);
			errsts = check_condition_result;
			break;
		}
		errsts = resp_readcap16(SCpnt, devip);
		break;
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	case MAINTENANCE_IN:
		if (MI_REPORT_TARGET_PGS != cmd[1]) {
			mk_sense_buffer(devip, ILLEGAL_REQUEST,
					INVALID_OPCODE, 0);
			errsts = check_condition_result;
			break;
		}
		errsts = resp_report_tgtpgs(SCpnt, devip);
		break;
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	case READ_16:
	case READ_12:
	case READ_10:
	case READ_6:
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		if ((errsts = check_readiness(SCpnt, 0, devip)))
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			break;
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		if (scsi_debug_fake_rw)
			break;
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		get_data_transfer_info(cmd, &lba, &num);
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		errsts = resp_read(SCpnt, lba, num, devip);
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		if (inj_recovered && (0 == errsts)) {
			mk_sense_buffer(devip, RECOVERED_ERROR,
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					THRESHOLD_EXCEEDED, 0);
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			errsts = check_condition_result;
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		} else if (inj_transport && (0 == errsts)) {
                        mk_sense_buffer(devip, ABORTED_COMMAND,
                                        TRANSPORT_PROBLEM, ACK_NAK_TO);
                        errsts = check_condition_result;
                }
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		break;
	case REPORT_LUNS:	/* mandatory, ignore unit attention */
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		delay_override = 1;
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		errsts = resp_report_luns(SCpnt, devip);
		break;
	case VERIFY:		/* 10 byte SBC-2 command */
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		errsts = check_readiness(SCpnt, 0, devip);
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		break;
	case WRITE_16:
	case WRITE_12:
	case WRITE_10:
	case WRITE_6:
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		if ((errsts = check_readiness(SCpnt, 0, devip)))
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			break;
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		if (scsi_debug_fake_rw)
			break;
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		get_data_transfer_info(cmd, &lba, &num);
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		errsts = resp_write(SCpnt, lba, num, devip);
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		if (inj_recovered && (0 == errsts)) {
			mk_sense_buffer(devip, RECOVERED_ERROR,
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					THRESHOLD_EXCEEDED, 0);
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			errsts = check_condition_result;
		}
		break;
	case MODE_SENSE:
	case MODE_SENSE_10:
		errsts = resp_mode_sense(SCpnt, target, devip);
		break;
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	case MODE_SELECT:
		errsts = resp_mode_select(SCpnt, 1, devip);
		break;
	case MODE_SELECT_10:
		errsts = resp_mode_select(SCpnt, 0, devip);
		break;
	case LOG_SENSE:
		errsts = resp_log_sense(SCpnt, devip);
		break;
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	case SYNCHRONIZE_CACHE:
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		delay_override = 1;
		errsts = check_readiness(SCpnt, 0, devip);
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		break;
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	case WRITE_BUFFER:
		errsts = check_readiness(SCpnt, 1, devip);
		break;
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	case XDWRITEREAD_10:
		if (!scsi_bidi_cmnd(SCpnt)) {
			mk_sense_buffer(devip, ILLEGAL_REQUEST,
					INVALID_FIELD_IN_CDB, 0);
			errsts = check_condition_result;
			break;
		}

		errsts = check_readiness(SCpnt, 0, devip);
		if (errsts)
			break;
		if (scsi_debug_fake_rw)
			break;
		get_data_transfer_info(cmd, &lba, &num);
		errsts = resp_read(SCpnt, lba, num, devip);
		if (errsts)
			break;
		errsts = resp_write(SCpnt, lba, num, devip);
		if (errsts)
			break;
		errsts = resp_xdwriteread(SCpnt, lba, num, devip);
		break;
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	default:
		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
			printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
			       "supported\n", *cmd);
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		if ((errsts = check_readiness(SCpnt, 1, devip)))
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			break;	/* Unit attention takes precedence */
		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
		errsts = check_condition_result;
		break;
	}
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	return schedule_resp(SCpnt, devip, done, errsts,
			     (delay_override ? 0 : scsi_debug_delay));
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}

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 */
}

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static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
			   struct sdebug_dev_info * devip)
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{
	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;
	}
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	if ((0 == reset_only) && devip->stopped) {
		if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
			printk(KERN_INFO "scsi_debug: Reporting Not "
			       "ready: initializing command required\n");
		mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
				0x2);
		return check_condition_result;
	}
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	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;
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	struct scatterlist *sg;
	struct scsi_data_buffer *sdb = scsi_in(scp);
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	if (!sdb->length)
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		return 0;
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	if (!sdb->table.sgl)
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		return (DID_ERROR << 16);
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	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
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		return (DID_ERROR << 16);
	active = 1;
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	req_len = act_len = 0;
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	for_each_sg(sdb->table.sgl, sg, sdb->table.nents, k) {
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		if (active) {
			kaddr = (unsigned char *)
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				kmap_atomic(sg_page(sg), KM_USER0);
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			if (NULL == kaddr)
				return (DID_ERROR << 16);
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			kaddr_off = (unsigned char *)kaddr + sg->offset;
			len = sg->length;
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			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;
		}
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		req_len += sg->length;
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	}
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	if (sdb->resid)
		sdb->resid -= act_len;
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	else
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		sdb->resid = req_len - act_len;
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	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;
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	struct scatterlist * sg;
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	if (0 == scsi_bufflen(scp))
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		return 0;
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	if (NULL == scsi_sglist(scp))
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		return -1;
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	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
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		return -1;
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	req_len = fin = 0;
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	scsi_for_each_sg(scp, sg, scsi_sg_count(scp), k) {
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		kaddr = (unsigned char *)kmap_atomic(sg_page(sg), KM_USER0);
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		if (NULL == kaddr)
			return -1;
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		kaddr_off = (unsigned char *)kaddr + sg->offset;
		len = sg->length;
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		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;
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		req_len += sg->length;
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	}
	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";

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static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
			   int target_dev_id, int dev_id_num,
			   const char * dev_id_str,
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			   int dev_id_str_len)
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{
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	int num, port_a;
	char b[32];
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	port_a = target_dev_id + 1;
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	/* 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;
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	if (dev_id_num >= 0) {
		/* NAA-5, Logical unit identifier (binary) */
		arr[num++] = 0x1;	/* binary (not necessarily sas) */
		arr[num++] = 0x3;	/* PIV=0, lu, naa */
		arr[num++] = 0x0;
		arr[num++] = 0x8;
		arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
		arr[num++] = 0x33;
		arr[num++] = 0x33;
		arr[num++] = 0x30;
		arr[num++] = (dev_id_num >> 24);
		arr[num++] = (dev_id_num >> 16) & 0xff;
		arr[num++] = (dev_id_num >> 8) & 0xff;
		arr[num++] = dev_id_num & 0xff;
		/* Target relative port number */
		arr[num++] = 0x61;	/* proto=sas, binary */
		arr[num++] = 0x94;	/* PIV=1, target port, rel port */
		arr[num++] = 0x0;	/* reserved */
		arr[num++] = 0x4;	/* length */
		arr[num++] = 0x0;	/* reserved */
		arr[num++] = 0x0;	/* reserved */
		arr[num++] = 0x0;
		arr[num++] = 0x1;	/* relative port A */
	}
	/* NAA-5, Target port identifier */
	arr[num++] = 0x61;	/* proto=sas, binary */
	arr[num++] = 0x93;	/* piv=1, target port, naa */
	arr[num++] = 0x0;
	arr[num++] = 0x8;
	arr[num++] = 0x52;	/* naa-5, company id=0x222222 (fake) */
	arr[num++] = 0x22;
	arr[num++] = 0x22;
	arr[num++] = 0x20;
	arr[num++] = (port_a >> 24);
	arr[num++] = (port_a >> 16) & 0xff;
	arr[num++] = (port_a >> 8) & 0xff;
	arr[num++] = port_a & 0xff;
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	/* NAA-5, Target port group identifier */
	arr[num++] = 0x61;	/* proto=sas, binary */
	arr[num++] = 0x95;	/* piv=1, target port group id */
	arr[num++] = 0x0;
	arr[num++] = 0x4;
	arr[num++] = 0;
	arr[num++] = 0;
	arr[num++] = (port_group_id >> 8) & 0xff;
	arr[num++] = port_group_id & 0xff;
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	/* NAA-5, Target device identifier */
	arr[num++] = 0x61;	/* proto=sas, binary */
	arr[num++] = 0xa3;	/* piv=1, target device, naa */
	arr[num++] = 0x0;
	arr[num++] = 0x8;
	arr[num++] = 0x52;	/* naa-5, company id=0x222222 (fake) */
	arr[num++] = 0x22;
	arr[num++] = 0x22;
	arr[num++] = 0x20;
	arr[num++] = (target_dev_id >> 24);
	arr[num++] = (target_dev_id >> 16) & 0xff;
	arr[num++] = (target_dev_id >> 8) & 0xff;
	arr[num++] = target_dev_id & 0xff;
	/* SCSI name string: Target device identifier */
	arr[num++] = 0x63;	/* proto=sas, UTF-8 */
	arr[num++] = 0xa8;	/* piv=1, target device, SCSI name string */
	arr[num++] = 0x0;
	arr[num++] = 24;
	memcpy(arr + num, "naa.52222220", 12);
	num += 12;
	snprintf(b, sizeof(b), "%08X", target_dev_id);
	memcpy(arr + num, b, 8);
	num += 8;
	memset(arr + num, 0, 4);
	num += 4;
	return num;
}


static unsigned char vpd84_data[] = {
/* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
    0x22,0x22,0x22,0x0,0xbb,0x1,
    0x22,0x22,0x22,0x0,0xbb,0x2,
};

static int inquiry_evpd_84(unsigned char * arr)
{
	memcpy(arr, vpd84_data, sizeof(vpd84_data));
	return sizeof(vpd84_data);
}

static int inquiry_evpd_85(unsigned char * arr)
{
	int num = 0;
	const char * na1 = "https://www.kernel.org/config";
	const char * na2 = "http://www.kernel.org/log";
	int plen, olen;

	arr[num++] = 0x1;	/* lu, storage config */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;
	olen = strlen(na1);
	plen = olen + 1;
	if (plen % 4)
		plen = ((plen / 4) + 1) * 4;
	arr[num++] = plen;	/* length, null termianted, padded */
	memcpy(arr + num, na1, olen);
	memset(arr + num + olen, 0, plen - olen);
	num += plen;

	arr[num++] = 0x4;	/* lu, logging */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;
	olen = strlen(na2);
	plen = olen + 1;
	if (plen % 4)
		plen = ((plen / 4) + 1) * 4;
	arr[num++] = plen;	/* length, null terminated, padded */
	memcpy(arr + num, na2, olen);
	memset(arr + num + olen, 0, plen - olen);
	num += plen;

	return num;
}

/* SCSI ports VPD page */
static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
{
	int num = 0;
	int port_a, port_b;

	port_a = target_dev_id + 1;
	port_b = port_a + 1;
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;
	arr[num++] = 0x1;	/* relative port 1 (primary) */
	memset(arr + num, 0, 6);
	num += 6;
	arr[num++] = 0x0;
	arr[num++] = 12;	/* length tp descriptor */
	/* naa-5 target port identifier (A) */
	arr[num++] = 0x61;	/* proto=sas, binary */
	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x8;	/* length */
	arr[num++] = 0x52;	/* NAA-5, company_id=0x222222 (fake) */
	arr[num++] = 0x22;
	arr[num++] = 0x22;
	arr[num++] = 0x20;
	arr[num++] = (port_a >> 24);
	arr[num++] = (port_a >> 16) & 0xff;
	arr[num++] = (port_a >> 8) & 0xff;
	arr[num++] = port_a & 0xff;

	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x0;
	arr[num++] = 0x2;	/* relative port 2 (secondary) */
	memset(arr + num, 0, 6);
	num += 6;
	arr[num++] = 0x0;
	arr[num++] = 12;	/* length tp descriptor */
	/* naa-5 target port identifier (B) */
	arr[num++] = 0x61;	/* proto=sas, binary */
	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
	arr[num++] = 0x0;	/* reserved */
	arr[num++] = 0x8;	/* length */
	arr[num++] = 0x52;	/* NAA-5, company_id=0x222222 (fake) */
	arr[num++] = 0x22;
	arr[num++] = 0x22;
	arr[num++] = 0x20;
	arr[num++] = (port_b >> 24);
	arr[num++] = (port_b >> 16) & 0xff;
	arr[num++] = (port_b >> 8) & 0xff;
	arr[num++] = port_b & 0xff;

	return num;
}


static unsigned char vpd89_data[] = {
/* from 4th byte */ 0,0,0,0,
'l','i','n','u','x',' ',' ',' ',
'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
'1','2','3','4',
0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
0xec,0,0,0,
0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
0x53,0x41,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
0x20,0x20,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
0x10,0x80,
0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
};

static int inquiry_evpd_89(unsigned char * arr)
{
	memcpy(arr, vpd89_data, sizeof(vpd89_data));
	return sizeof(vpd89_data);
}


static unsigned char vpdb0_data[] = {
	/* from 4th byte */ 0,0,0,4,
	0,0,0x4,0,
	0,0,0,64,
};

static int inquiry_evpd_b0(unsigned char * arr)
{
	memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
	if (sdebug_store_sectors > 0x400) {
		arr[4] = (sdebug_store_sectors >> 24) & 0xff;
		arr[5] = (sdebug_store_sectors >> 16) & 0xff;
		arr[6] = (sdebug_store_sectors >> 8) & 0xff;
		arr[7] = sdebug_store_sectors & 0xff;
	}
	return sizeof(vpdb0_data);
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}


#define SDEBUG_LONG_INQ_SZ 96
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#define SDEBUG_MAX_INQ_ARR_SZ 584
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static int resp_inquiry(struct scsi_cmnd * scp, int target,
			struct sdebug_dev_info * devip)
{
	unsigned char pq_pdt;
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	unsigned char * arr;
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	unsigned char *cmd = (unsigned char *)scp->cmnd;
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	int alloc_len, n, ret;
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	alloc_len = (cmd[3] << 8) + cmd[4];
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	arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
	if (! arr)
		return DID_REQUEUE << 16;
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	if (devip->wlun)
		pq_pdt = 0x1e;	/* present, wlun */
	else if (scsi_debug_no_lun_0 && (0 == devip->lun))
		pq_pdt = 0x7f;	/* not present, no device type */
	else
		pq_pdt = (scsi_debug_ptype & 0x1f);
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	arr[0] = pq_pdt;
	if (0x2 & cmd[1]) {  /* CMDDT bit set */
		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
			       	0);
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		kfree(arr);
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		return check_condition_result;
	} else if (0x1 & cmd[1]) {  /* EVPD bit set */
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		int lu_id_num, port_group_id, target_dev_id, len;
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		char lu_id_str[6];
		int host_no = devip->sdbg_host->shost->host_no;
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		port_group_id = (((host_no + 1) & 0x7f) << 8) +
		    (devip->channel & 0x7f);
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		if (0 == scsi_debug_vpd_use_hostno)
			host_no = 0;
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		lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
			    (devip->target * 1000) + devip->lun);
		target_dev_id = ((host_no + 1) * 2000) +
				 (devip->target * 1000) - 3;
		len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
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		if (0 == cmd[2]) { /* supported vital product data pages */
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			arr[1] = cmd[2];	/*sanity */
			n = 4;
			arr[n++] = 0x0;   /* this page */
			arr[n++] = 0x80;  /* unit serial number */
			arr[n++] = 0x83;  /* device identification */
			arr[n++] = 0x84;  /* software interface ident. */
			arr[n++] = 0x85;  /* management network addresses */
			arr[n++] = 0x86;  /* extended inquiry */
			arr[n++] = 0x87;  /* mode page policy */
			arr[n++] = 0x88;  /* SCSI ports */
			arr[n++] = 0x89;  /* ATA information */
			arr[n++] = 0xb0;  /* Block limits (SBC) */
			arr[3] = n - 4;	  /* number of supported VPD pages */
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		} else if (0x80 == cmd[2]) { /* unit serial number */
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			arr[1] = cmd[2];	/*sanity */
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			arr[3] = len;
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			memcpy(&arr[4], lu_id_str, len);
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		} else if (0x83 == cmd[2]) { /* device identification */
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			arr[1] = cmd[2];	/*sanity */
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			arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
						 target_dev_id, lu_id_num,
						 lu_id_str, len);
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		} else if (0x84 == cmd[2]) { /* Software interface ident. */
			arr[1] = cmd[2];	/*sanity */
			arr[3] = inquiry_evpd_84(&arr[4]);
		} else if (0x85 == cmd[2]) { /* Management network addresses */
			arr[1] = cmd[2];	/*sanity */
			arr[3] = inquiry_evpd_85(&arr[4]);
		} else if (0x86 == cmd[2]) { /* extended inquiry */
			arr[1] = cmd[2];	/*sanity */
			arr[3] = 0x3c;	/* number of following entries */
			arr[4] = 0x0;   /* no protection stuff */
			arr[5] = 0x7;   /* head of q, ordered + simple q's */
		} else if (0x87 == cmd[2]) { /* mode page policy */
			arr[1] = cmd[2];	/*sanity */
			arr[3] = 0x8;	/* number of following entries */
			arr[4] = 0x2;	/* disconnect-reconnect mp */
			arr[6] = 0x80;	/* mlus, shared */
			arr[8] = 0x18;	 /* protocol specific lu */
			arr[10] = 0x82;	 /* mlus, per initiator port */
		} else if (0x88 == cmd[2]) { /* SCSI Ports */
			arr[1] = cmd[2];	/*sanity */
			arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
		} else if (0x89 == cmd[2]) { /* ATA information */
			arr[1] = cmd[2];        /*sanity */
			n = inquiry_evpd_89(&arr[4]);
			arr[2] = (n >> 8);
			arr[3] = (n & 0xff);
		} else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
			arr[1] = cmd[2];        /*sanity */
			arr[3] = inquiry_evpd_b0(&arr[4]);
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		} else {
			/* Illegal request, invalid field in cdb */
			mk_sense_buffer(devip, ILLEGAL_REQUEST,
					INVALID_FIELD_IN_CDB, 0);
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			kfree(arr);
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			return check_condition_result;
		}
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		len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
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		ret = fill_from_dev_buffer(scp, arr,
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			    min(len, SDEBUG_MAX_INQ_ARR_SZ));
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		kfree(arr);
		return ret;
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	}
	/* 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;
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	if (0 == scsi_debug_vpd_use_hostno)
		arr[5] = 0x10; /* claim: implicit TGPS */
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	arr[6] = 0x10; /* claim: MultiP */
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	/* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
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	arr[7] = 0xa; /* claim: LINKED + CMDQUE */
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	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 */
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	arr[58] = 0x0; arr[59] = 0x77; /* SAM-3 ANSI */
	arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
	n = 62;
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	if (scsi_debug_ptype == 0) {
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		arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
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	} else if (scsi_debug_ptype == 1) {
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		arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
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	}
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	arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
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	ret = fill_from_dev_buffer(scp, arr,
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			    min(alloc_len, SDEBUG_LONG_INQ_SZ));
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	kfree(arr);
	return ret;
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}

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];
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	int want_dsense;
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	int len = 18;

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	memset(arr, 0, sizeof(arr));
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	if (devip->reset == 1)
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		mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
	want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
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	sbuff = devip->sense_buff;
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	if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
		if (want_dsense) {
			arr[0] = 0x72;
			arr[1] = 0x0;		/* NO_SENSE in sense_key */
			arr[2] = THRESHOLD_EXCEEDED;
			arr[3] = 0xff;		/* TEST set and MRIE==6 */
		} else {
			arr[0] = 0x70;
			arr[2] = 0x0;		/* NO_SENSE in sense_key */
			arr[7] = 0xa;   	/* 18 byte sense buffer */
			arr[12] = THRESHOLD_EXCEEDED;
			arr[13] = 0xff;		/* TEST set and MRIE==6 */
		}
	} else {
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		memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
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		if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
			/* DESC bit set and sense_buff in fixed format */
			memset(arr, 0, sizeof(arr));
			arr[0] = 0x72;
			arr[1] = sbuff[2];     /* sense key */
			arr[2] = sbuff[12];    /* asc */
			arr[3] = sbuff[13];    /* ascq */
			len = 8;
		}
	}
	mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
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	return fill_from_dev_buffer(scp, arr, len);
}

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static int resp_start_stop(struct scsi_cmnd * scp,
			   struct sdebug_dev_info * devip)
{
	unsigned char *cmd = (unsigned char *)scp->cmnd;
	int power_cond, errsts, start;

	if ((errsts = check_readiness(scp, 1, devip)))
		return errsts;
	power_cond = (cmd[4] & 0xf0) >> 4;
	if (power_cond) {
		mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
			       	0);
		return check_condition_result;
	}
	start = cmd[4] & 1;
	if (start == devip->stopped)
		devip->stopped = !start;
	return 0;
}

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#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];
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	unsigned int capac;
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	int errsts;

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	if ((errsts = check_readiness(scp, 1, devip)))
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		return errsts;
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	/* following just in case virtual_gb changed */
	if (scsi_debug_virtual_gb > 0) {
		sdebug_capacity = 2048 * 1024;
		sdebug_capacity *= scsi_debug_virtual_gb;
	} else
		sdebug_capacity = sdebug_store_sectors;
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	memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
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	if (sdebug_capacity < 0xffffffff) {
		capac = (unsigned int)sdebug_capacity - 1;
		arr[0] = (capac >> 24);
		arr[1] = (capac >> 16) & 0xff;
		arr[2] = (capac >> 8) & 0xff;
		arr[3] = capac & 0xff;
	} else {
		arr[0] = 0xff;
		arr[1] = 0xff;
		arr[2] = 0xff;
		arr[3] = 0xff;
	}
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	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);
}

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#define SDEBUG_READCAP16_ARR_SZ 32
static int resp_readcap16(struct scsi_cmnd * scp,
			  struct sdebug_dev_info * devip)
{
	unsigned char *cmd = (unsigned char *)scp->cmnd;
	unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
	unsigned long long capac;
	int errsts, k, alloc_len;

	if ((errsts = check_readiness(scp, 1, devip)))
		return errsts;
	alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
		     + cmd[13]);
	/* following just in case virtual_gb changed */
	if (scsi_debug_virtual_gb > 0) {
		sdebug_capacity = 2048 * 1024;
		sdebug_capacity *= scsi_debug_virtual_gb;
	} else
		sdebug_capacity = sdebug_store_sectors;
	memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
	capac = sdebug_capacity - 1;
	for (k = 0; k < 8; ++k, capac >>= 8)
		arr[7 - k] = capac & 0xff;
	arr[8] = (SECT_SIZE_PER(target) >> 24) & 0xff;
	arr[9] = (SECT_SIZE_PER(target) >> 16) & 0xff;
	arr[10] = (SECT_SIZE_PER(target) >> 8) & 0xff;
	arr[11] = SECT_SIZE_PER(target) & 0xff;
	return fill_from_dev_buffer(scp, arr,
				    min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
}

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#define SDEBUG_MAX_TGTPGS_ARR_SZ 1412

static int resp_report_tgtpgs(struct scsi_cmnd * scp,
			      struct sdebug_dev_info * devip)
{
	unsigned char *cmd = (unsigned char *)scp->cmnd;
	unsigned char * arr;
	int host_no = devip->sdbg_host->shost->host_no;
	int n, ret, alen, rlen;
	int port_group_a, port_group_b, port_a, port_b;

	alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
		+ cmd[9]);

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	arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
	if (! arr)
		return DID_REQUEUE << 16;
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	/*
	 * EVPD page 0x88 states we have two ports, one
	 * real and a fake port with no device connected.
	 * So we create two port groups with one port each
	 * and set the group with port B to unavailable.
	 */
	port_a = 0x1; /* relative port A */
	port_b = 0x2; /* relative port B */
	port_group_a = (((host_no + 1) & 0x7f) << 8) +
	    (devip->channel & 0x7f);
	port_group_b = (((host_no + 1) & 0x7f) << 8) +
	    (devip->channel & 0x7f) + 0x80;

	/*
	 * The asymmetric access state is cycled according to the host_id.
	 */
	n = 4;
	if (0 == scsi_debug_vpd_use_hostno) {
	    arr[n++] = host_no % 3; /* Asymm access state */
	    arr[n++] = 0x0F; /* claim: all states are supported */
	} else {
	    arr[n++] = 0x0; /* Active/Optimized path */
	    arr[n++] = 0x01; /* claim: only support active/optimized paths */
	}
	arr[n++] = (port_group_a >> 8) & 0xff;
	arr[n++] = port_group_a & 0xff;
	arr[n++] = 0;    /* Reserved */
	arr[n++] = 0;    /* Status code */
	arr[n++] = 0;    /* Vendor unique */
	arr[n++] = 0x1;  /* One port per group */
	arr[n++] = 0;    /* Reserved */
	arr[n++] = 0;    /* Reserved */
	arr[n++] = (port_a >> 8) & 0xff;
	arr[n++] = port_a & 0xff;
	arr[n++] = 3;    /* Port unavailable */
	arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
	arr[n++] = (port_group_b >> 8) & 0xff;
	arr[n++] = port_group_b & 0xff;
	arr[n++] = 0;    /* Reserved */
	arr[n++] = 0;    /* Status code */
	arr[n++] = 0;    /* Vendor unique */
	arr[n++] = 0x1;  /* One port per group */
	arr[n++] = 0;    /* Reserved */
	arr[n++] = 0;    /* Reserved */
	arr[n++] = (port_b >> 8) & 0xff;
	arr[n++] = port_b & 0xff;

	rlen = n - 4;
	arr[0] = (rlen >> 24) & 0xff;
	arr[1] = (rlen >> 16) & 0xff;
	arr[2] = (rlen >> 8) & 0xff;
	arr[3] = rlen & 0xff;

	/*
	 * Return the smallest value of either
	 * - The allocated length
	 * - The constructed command length
	 * - The maximum array size
	 */
	rlen = min(alen,n);
	ret = fill_from_dev_buffer(scp, arr,
				   min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
	kfree(arr);
	return ret;
}

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/* <<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 */
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	unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
				        0, 0, 0, 0};
	unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
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				     0, 0, 0x2, 0x4b};

	if (scsi_debug_dsense)
		ctrl_m_pg[2] |= 0x4;
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	else
		ctrl_m_pg[2] &= ~0x4;
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	memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
	if (1 == pcontrol)
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		memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
	else if (2 == pcontrol)
		memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
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	return sizeof(ctrl_m_pg);
}

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static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
{	/* Informational Exceptions control mode page for mode_sense */
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	unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
				       0, 0, 0x0, 0x0};
	unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
				      0, 0, 0x0, 0x0};

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	memcpy(p, iec_m_pg, sizeof(iec_m_pg));
	if (1 == pcontrol)
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		memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
	else if (2 == pcontrol)
		memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
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	return sizeof(iec_m_pg);
}

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static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
{	/* SAS SSP mode page - short format for mode_sense */
	unsigned char sas_sf_m_pg[] = {0x19, 0x6,
		0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};

	memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
	if (1 == pcontrol)
		memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
	return sizeof(sas_sf_m_pg);
}


static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
			      int target_dev_id)
{	/* SAS phy control and discover mode page for mode_sense */
	unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
		    0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
		    0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
		    0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
		    0x2, 0, 0, 0, 0, 0, 0, 0,
		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
		    0, 0, 0, 0, 0, 0, 0, 0,
		    0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
		    0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
		    0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
		    0x3, 0, 0, 0, 0, 0, 0, 0,
		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
		    0, 0, 0, 0, 0, 0, 0, 0,
		};
	int port_a, port_b;

	port_a = target_dev_id + 1;
	port_b = port_a + 1;
	memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
	p[20] = (port_a >> 24);
	p[21] = (port_a >> 16) & 0xff;
	p[22] = (port_a >> 8) & 0xff;
	p[23] = port_a & 0xff;
	p[48 + 20] = (port_b >> 24);
	p[48 + 21] = (port_b >> 16) & 0xff;
	p[48 + 22] = (port_b >> 8) & 0xff;
	p[48 + 23] = port_b & 0xff;
	if (1 == pcontrol)
		memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
	return sizeof(sas_pcd_m_pg);
}

static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
{	/* SAS SSP shared protocol specific port mode subpage */
	unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
		    0, 0, 0, 0, 0, 0, 0, 0,
		};

	memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
	if (1 == pcontrol)
		memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
	return sizeof(sas_sha_m_pg);
}

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#define SDEBUG_MAX_MSENSE_SZ 256

static int resp_mode_sense(struct scsi_cmnd * scp, int target,
			   struct sdebug_dev_info * devip)
{
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	unsigned char dbd, llbaa;
	int pcontrol, pcode, subpcode, bd_len;
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	unsigned char dev_spec;
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	int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
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	unsigned char * ap;
	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
	unsigned char *cmd = (unsigned char *)scp->cmnd;

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	if ((errsts = check_readiness(scp, 1, devip)))
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		return errsts;
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	dbd = !!(cmd[1] & 0x8);
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	pcontrol = (cmd[2] & 0xc0) >> 6;
	pcode = cmd[2] & 0x3f;
	subpcode = cmd[3];
	msense_6 = (MODE_SENSE == cmd[0]);
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	llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
	if ((0 == scsi_debug_ptype) && (0 == dbd))
		bd_len = llbaa ? 16 : 8;
	else
		bd_len = 0;
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	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;
	}
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	target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
			(devip->target * 1000) - 3;
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	/* set DPOFUA bit for disks */
	if (0 == scsi_debug_ptype)
		dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
	else
		dev_spec = 0x0;
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	if (msense_6) {
		arr[2] = dev_spec;
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		arr[3] = bd_len;
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		offset = 4;
	} else {
		arr[3] = dev_spec;
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		if (16 == bd_len)
			arr[4] = 0x1;	/* set LONGLBA bit */
		arr[7] = bd_len;	/* assume 255 or less */
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