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Commit 23183910 authored by Douglas Gilbert's avatar Douglas Gilbert Committed by James Bottomley
Browse files

[SCSI] scsi_debug version 1.80 

See http://www.torque.net/sg/sdebug26.html

 for more
information on the scsi_debug driver.

ChangeLog:
  - add 'vpd_use_hostno' parameter to allow simulated hosts
    to see the same set of targets (and luns). For testing
    multipath software.
  - add 'fake_rw' parameter to ignore the data in READ and
    WRITE commands
  - add support for log subpages (new in SPC-4)
  - yield appropriate block descriptor for MODE SENSE
    commands (only for pdt=0 (i.e. disks))
  - REQUEST SENSE response no longer shows the stopped
    power condition (SAT changed to agree with SPC-3)

Signed-off-by: default avatarDouglas Gilbert <dougg@torque.net>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent c9802cd9

drivers/scsi/scsi_debug.c

+189 −41
Original line number Diff line number Diff line 
/*

 *  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
@@ -8,7 +7,9 @@ 
 * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 *

 *  This version is more generic, simulating a variable number of disk

 *  (or disk like devices) sharing a common amount of RAM

 *  (or disk like devices) sharing a common amount of RAM. To be more

 *  realistic, the simulated devices have the transport attributes of

 *  SAS disks.

 *

 *

 *  For documentation see http://www.torque.net/sg/sdebug26.html
@@ -50,8 +51,8 @@ 
#include "scsi_logging.h"

#include "scsi_debug.h"



#define SCSI_DEBUG_VERSION "1.79"

static const char * scsi_debug_version_date = "20060604";

#define SCSI_DEBUG_VERSION "1.80"

static const char * scsi_debug_version_date = "20060914";



/* Additional Sense Code (ASC) used */

#define NO_ADDITIONAL_SENSE 0x0
@@ -86,6 +87,8 @@ static const char * scsi_debug_version_date = "20060604"; 
#define DEF_D_SENSE   0

#define DEF_NO_LUN_0   0

#define DEF_VIRTUAL_GB   0

#define DEF_FAKE_RW	0

#define DEF_VPD_USE_HOSTNO 1



/* bit mask values for scsi_debug_opts */

#define SCSI_DEBUG_OPT_NOISE   1
@@ -127,6 +130,8 @@ static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */ 
static int scsi_debug_dsense = DEF_D_SENSE;

static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;

static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;

static int scsi_debug_fake_rw = DEF_FAKE_RW;

static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;



static int scsi_debug_cmnd_count = 0;
@@ -423,6 +428,8 @@ int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done) 
	case READ_6:

		if ((errsts = check_readiness(SCpnt, 0, devip)))

			break;

		if (scsi_debug_fake_rw)

			break;

		if ((*cmd) == READ_16) {

			for (lba = 0, j = 0; j < 8; ++j) {

				if (j > 0)
@@ -465,6 +472,8 @@ int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done) 
	case WRITE_6:

		if ((errsts = check_readiness(SCpnt, 0, devip)))

			break;

		if (scsi_debug_fake_rw)

			break;

		if ((*cmd) == WRITE_16) {

			for (lba = 0, j = 0; j < 8; ++j) {

				if (j > 0)
@@ -941,6 +950,8 @@ static int resp_inquiry(struct scsi_cmnd * scp, int target, 
		char lu_id_str[6];

		int host_no = devip->sdbg_host->shost->host_no;

		

		if (0 == scsi_debug_vpd_use_hostno)

			host_no = 0;

		lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +

			    (devip->target * 1000) + devip->lun);

		target_dev_id = ((host_no + 1) * 2000) +
@@ -1059,19 +1070,6 @@ static int resp_requests(struct scsi_cmnd * scp, 
			arr[12] = THRESHOLD_EXCEEDED;

			arr[13] = 0xff;		/* TEST set and MRIE==6 */

		}

	} else if (devip->stopped) {

		if (want_dsense) {

			arr[0] = 0x72;

			arr[1] = 0x0;		/* NO_SENSE in sense_key */

			arr[2] = LOW_POWER_COND_ON;

			arr[3] = 0x0;		/* 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] = LOW_POWER_COND_ON;

			arr[13] = 0x0;		/* TEST set and MRIE==6 */

		}

	} else {

		memcpy(arr, sbuff, SDEBUG_SENSE_LEN);

		if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
@@ -1325,21 +1323,26 @@ static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol) 
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 dbd, llbaa;

	int pcontrol, pcode, subpcode, bd_len;

	unsigned char dev_spec;

	int alloc_len, msense_6, offset, len, errsts, target_dev_id;

	int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;

	unsigned char * ap;

	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];

	unsigned char *cmd = (unsigned char *)scp->cmnd;



	if ((errsts = check_readiness(scp, 1, devip)))

		return errsts;

	dbd = cmd[1] & 0x8;

	dbd = !!(cmd[1] & 0x8);

	pcontrol = (cmd[2] & 0xc0) >> 6;

	pcode = cmd[2] & 0x3f;

	subpcode = cmd[3];

	msense_6 = (MODE_SENSE == cmd[0]);

	llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);

	if ((0 == scsi_debug_ptype) && (0 == dbd))

		bd_len = llbaa ? 16 : 8;

	else

		bd_len = 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 */
@@ -1349,15 +1352,58 @@ static int resp_mode_sense(struct scsi_cmnd * scp, int target, 
	}

	target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +

			(devip->target * 1000) - 3;

	dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;

	/* set DPOFUA bit for disks */

	if (0 == scsi_debug_ptype)

		dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;

	else

		dev_spec = 0x0;

	if (msense_6) {

		arr[2] = dev_spec;

		arr[3] = bd_len;

		offset = 4;

	} else {

		arr[3] = dev_spec;

		if (16 == bd_len)

			arr[4] = 0x1;	/* set LONGLBA bit */

		arr[7] = bd_len;	/* assume 255 or less */

		offset = 8;

	}

	ap = arr + offset;

	if ((bd_len > 0) && (0 == sdebug_capacity)) {

		if (scsi_debug_virtual_gb > 0) {

			sdebug_capacity = 2048 * 1024;

			sdebug_capacity *= scsi_debug_virtual_gb;

		} else

			sdebug_capacity = sdebug_store_sectors;

	}

	if (8 == bd_len) {

		if (sdebug_capacity > 0xfffffffe) {

			ap[0] = 0xff;

			ap[1] = 0xff;

			ap[2] = 0xff;

			ap[3] = 0xff;

		} else {

			ap[0] = (sdebug_capacity >> 24) & 0xff;

			ap[1] = (sdebug_capacity >> 16) & 0xff;

			ap[2] = (sdebug_capacity >> 8) & 0xff;

			ap[3] = sdebug_capacity & 0xff;

		}

        	ap[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;

        	ap[7] = SECT_SIZE_PER(target) & 0xff;

		offset += bd_len;

		ap = arr + offset;

	} else if (16 == bd_len) {

		unsigned long long capac = sdebug_capacity;



        	for (k = 0; k < 8; ++k, capac >>= 8)

                	ap[7 - k] = capac & 0xff;

        	ap[12] = (SECT_SIZE_PER(target) >> 24) & 0xff;

        	ap[13] = (SECT_SIZE_PER(target) >> 16) & 0xff;

        	ap[14] = (SECT_SIZE_PER(target) >> 8) & 0xff;

        	ap[15] = SECT_SIZE_PER(target) & 0xff;

		offset += bd_len;

		ap = arr + offset;

	}



	if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {

		/* TODO: Control Extension page */
@@ -1471,7 +1517,7 @@ static int resp_mode_select(struct scsi_cmnd * scp, int mselect6, 
                       " IO sent=%d bytes\n", param_len, res);

	md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);

	bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);

	if ((md_len > 2) || (0 != bd_len)) {

	if (md_len > 2) {

		mk_sense_buffer(devip, ILLEGAL_REQUEST,

				INVALID_FIELD_IN_PARAM_LIST, 0);

		return check_condition_result;
@@ -1544,7 +1590,7 @@ static int resp_ie_l_pg(unsigned char * arr) 
static int resp_log_sense(struct scsi_cmnd * scp,

                          struct sdebug_dev_info * devip)

{

	int ppc, sp, pcontrol, pcode, alloc_len, errsts, len, n;

	int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;

	unsigned char arr[SDEBUG_MAX_LSENSE_SZ];

	unsigned char *cmd = (unsigned char *)scp->cmnd;
@@ -1560,8 +1606,10 @@ static int resp_log_sense(struct scsi_cmnd * scp, 
	}

	pcontrol = (cmd[2] & 0xc0) >> 6;

	pcode = cmd[2] & 0x3f;

	subpcode = cmd[3] & 0xff;

	alloc_len = (cmd[7] << 8) + cmd[8];

	arr[0] = pcode;

	if (0 == subpcode) {

		switch (pcode) {

		case 0x0:	/* Supported log pages log page */

			n = 4;
@@ -1581,6 +1629,44 @@ static int resp_log_sense(struct scsi_cmnd * scp, 
					INVALID_FIELD_IN_CDB, 0);

			return check_condition_result;

		}

	} else if (0xff == subpcode) {

		arr[0] |= 0x40;

		arr[1] = subpcode;

		switch (pcode) {

		case 0x0:	/* Supported log pages and subpages log page */

			n = 4;

			arr[n++] = 0x0;

			arr[n++] = 0x0;		/* 0,0 page */

			arr[n++] = 0x0;

			arr[n++] = 0xff;	/* this page */

			arr[n++] = 0xd;

			arr[n++] = 0x0;		/* Temperature */

			arr[n++] = 0x2f;

			arr[n++] = 0x0;	/* Informational exceptions */

			arr[3] = n - 4;

			break;

		case 0xd:	/* Temperature subpages */

			n = 4;

			arr[n++] = 0xd;

			arr[n++] = 0x0;		/* Temperature */

			arr[3] = n - 4;

			break;

		case 0x2f:	/* Informational exceptions subpages */

			n = 4;

			arr[n++] = 0x2f;

			arr[n++] = 0x0;		/* Informational exceptions */

			arr[3] = n - 4;

			break;

		default:

			mk_sense_buffer(devip, ILLEGAL_REQUEST,

					INVALID_FIELD_IN_CDB, 0);

			return check_condition_result;

		}

	} else {

		mk_sense_buffer(devip, ILLEGAL_REQUEST,

				INVALID_FIELD_IN_CDB, 0);

		return check_condition_result;

	}

	len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);

	return fill_from_dev_buffer(scp, arr,

		    min(len, SDEBUG_MAX_INQ_ARR_SZ));
@@ -2151,11 +2237,18 @@ static int schedule_resp(struct scsi_cmnd * cmnd, 
	}

}



/* Note: The following macros create attribute files in the

   /sys/module/scsi_debug/parameters directory. Unfortunately this

   driver is unaware of a change and cannot trigger auxiliary actions

   as it can when the corresponding attribute in the

   /sys/bus/pseudo/drivers/scsi_debug directory is changed.

 */

module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);

module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);

module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);

module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);

module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);

module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);

module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);

module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);

module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
@@ -2164,6 +2257,8 @@ module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR); 
module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);

module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);

module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);

module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,

		   S_IRUGO | S_IWUSR);



MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");

MODULE_DESCRIPTION("SCSI debug adapter driver");
@@ -2175,6 +2270,7 @@ 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(def=8)");

MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");

MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");

MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");

MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");

MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");

MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
@@ -2183,6 +2279,7 @@ MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->... (def=0)"); 
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");

MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");

MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");

MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");





static char sdebug_info[256];
@@ -2334,6 +2431,24 @@ static ssize_t sdebug_dsense_store(struct device_driver * ddp, 
DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,

	    sdebug_dsense_store);



static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)

{

        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);

}

static ssize_t sdebug_fake_rw_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_fake_rw = n;

		return count;

	}

	return -EINVAL;

}

DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,

	    sdebug_fake_rw_store);



static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)

{

        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
@@ -2487,6 +2602,31 @@ static ssize_t sdebug_add_host_store(struct device_driver * ddp, 
DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show, 

	    sdebug_add_host_store);



static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,

					  char * buf)

{

	return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);

}

static ssize_t sdebug_vpd_use_hostno_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_vpd_use_hostno = n;

		return count;

	}

	return -EINVAL;

}

DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,

	    sdebug_vpd_use_hostno_store);



/* Note: The following function creates attribute files in the

   /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these

   files (over those found in the /sys/module/scsi_debug/parameters

   directory) is that auxiliary actions can be triggered when an attribute

   is changed. For example see: sdebug_add_host_store() above.

 */

static int do_create_driverfs_files(void)

{

	int ret;
@@ -2496,23 +2636,31 @@ static int do_create_driverfs_files(void) 
	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);

	ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);

	return ret;

}



static void do_remove_driverfs_files(void)

{

	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);

	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);

	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_num_parts);

	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);

	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);

	driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);

	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);