Commit 9267e0eb authored by Douglas Gilbert's avatar Douglas Gilbert Committed by Martin K. Petersen
Browse files

scsi: scsi_debug: Add ZBC module parameter 

Add the zbc module parameter to take either:
    0: none         (probably a conventional disk)
    1: host-aware
    2: host-managed

These values are chosen to match 'enum blk_zoned_model' found in
include/linux/blkdev.h . Instead of "none", "no" or "0" can be given.
Instead of "host-aware", "aware or "1" can be given. Instead of
"host-managed", "managed" or "2" can be given.

Note: the zbc parameter can only be given at driver/module load time; it
cannot be changed via sysfs thereafter.

At this time there is no ZBC "host-aware" implementation so that string (or
the value '1') results in a modprobe error.

Link: https://lore.kernel.org/r/20200422104221.378203-4-damien.lemoal@wdc.com


Signed-off-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent f0d1cf93

drivers/scsi/scsi_debug.c

+78 −3
Original line number Diff line number Diff line
@@ -113,7 +113,9 @@ static const char *sdebug_version_date = "20200421"; 
#define DEF_ATO 1

#define DEF_CDB_LEN 10

#define DEF_JDELAY   1		/* if > 0 unit is a jiffy */

#define DEF_DEV_SIZE_PRE_INIT   0

#define DEF_DEV_SIZE_MB   8

#define DEF_ZBC_DEV_SIZE_MB   128

#define DEF_DIF 0

#define DEF_DIX 0

#define DEF_PER_HOST_STORE false
@@ -736,7 +738,7 @@ static int sdebug_add_host = DEF_NUM_HOST; /* in sysfs this is relative */ 
static int sdebug_ato = DEF_ATO;

static int sdebug_cdb_len = DEF_CDB_LEN;

static int sdebug_jdelay = DEF_JDELAY;	/* if > 0 then unit is jiffies */

static int sdebug_dev_size_mb = DEF_DEV_SIZE_MB;

static int sdebug_dev_size_mb = DEF_DEV_SIZE_PRE_INIT;

static int sdebug_dif = DEF_DIF;

static int sdebug_dix = DEF_DIX;

static int sdebug_dsense = DEF_D_SENSE;
@@ -785,6 +787,9 @@ static bool have_dif_prot; 
static bool write_since_sync;

static bool sdebug_statistics = DEF_STATISTICS;

static bool sdebug_wp;

/* Following enum: 0: no zbc, def; 1: host aware; 2: host managed */

static enum blk_zoned_model sdeb_zbc_model = BLK_ZONED_NONE;

static char *sdeb_zbc_model_s;



static unsigned int sdebug_store_sectors;

static sector_t sdebug_capacity;	/* in sectors */
@@ -5534,6 +5539,7 @@ module_param_named(vpd_use_hostno, sdebug_vpd_use_hostno, int, 
module_param_named(wp, sdebug_wp, bool, S_IRUGO | S_IWUSR);

module_param_named(write_same_length, sdebug_write_same_length, int,

		   S_IRUGO | S_IWUSR);

module_param_named(zbc, sdeb_zbc_model_s, charp, S_IRUGO);



MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");

MODULE_DESCRIPTION("SCSI debug adapter driver");
@@ -5595,6 +5601,7 @@ MODULE_PARM_DESC(virtual_gb, "virtual gigabyte (GiB) size (def=0 -> use dev_size 
MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");

MODULE_PARM_DESC(wp, "Write Protect (def=0)");

MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");

MODULE_PARM_DESC(zbc, "'none' [0]; 'aware' [1]; 'managed' [2] (def=0). Can have 'host-' prefix");



#define SDEBUG_INFO_LEN 256

static char sdebug_info[SDEBUG_INFO_LEN];
@@ -6357,6 +6364,45 @@ static ssize_t cdb_len_store(struct device_driver *ddp, const char *buf, 
}

static DRIVER_ATTR_RW(cdb_len);



static const char * const zbc_model_strs_a[] = {

	[BLK_ZONED_NONE] = "none",

	[BLK_ZONED_HA]   = "host-aware",

	[BLK_ZONED_HM]   = "host-managed",

};



static const char * const zbc_model_strs_b[] = {

	[BLK_ZONED_NONE] = "no",

	[BLK_ZONED_HA]   = "aware",

	[BLK_ZONED_HM]   = "managed",

};



static const char * const zbc_model_strs_c[] = {

	[BLK_ZONED_NONE] = "0",

	[BLK_ZONED_HA]   = "1",

	[BLK_ZONED_HM]   = "2",

};



static int sdeb_zbc_model_str(const char *cp)

{

	int res = sysfs_match_string(zbc_model_strs_a, cp);



	if (res < 0) {

		res = sysfs_match_string(zbc_model_strs_b, cp);

		if (res < 0) {

			res = sysfs_match_string(zbc_model_strs_c, cp);

			if (sdeb_zbc_model < 0)

				return -EINVAL;

		}

	}

	return res;

}



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

{

	return scnprintf(buf, PAGE_SIZE, "%s\n",

			 zbc_model_strs_a[sdeb_zbc_model]);

}

static DRIVER_ATTR_RO(zbc);



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

   /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
@@ -6399,6 +6445,7 @@ static struct attribute *sdebug_drv_attrs[] = { 
	&driver_attr_strict.attr,

	&driver_attr_uuid_ctl.attr,

	&driver_attr_cdb_len.attr,

	&driver_attr_zbc.attr,

	NULL,

};

ATTRIBUTE_GROUPS(sdebug_drv);
@@ -6488,11 +6535,39 @@ static int __init scsi_debug_init(void) 
		spin_lock_init(&sdebug_q_arr[k].qc_lock);



	/*

	 * check for host managed zoned block device specified with ptype=0x14.

	 * check for host managed zoned block device specified with

	 * ptype=0x14 or zbc=XXX.

	 */

	if (sdebug_ptype == TYPE_ZBC)

	if (sdebug_ptype == TYPE_ZBC) {

		sdeb_zbc_model = BLK_ZONED_HM;

	} else if (sdeb_zbc_model_s && *sdeb_zbc_model_s) {

		k = sdeb_zbc_model_str(sdeb_zbc_model_s);

		if (k < 0) {

			ret = k;

			goto free_vm;

		}

		sdeb_zbc_model = k;

		switch (sdeb_zbc_model) {

		case BLK_ZONED_NONE:

			sdebug_ptype = TYPE_DISK;

			break;

		case BLK_ZONED_HM:

			sdebug_ptype = TYPE_ZBC;

			break;

		case BLK_ZONED_HA:

		default:

			pr_err("Invalid ZBC model\n");

			return -EINVAL;

		}

	}

	if (sdeb_zbc_model != BLK_ZONED_NONE) {

		sdeb_zbc_in_use = true;

		if (sdebug_dev_size_mb == DEF_DEV_SIZE_PRE_INIT)

			sdebug_dev_size_mb = DEF_ZBC_DEV_SIZE_MB;

	}



	if (sdebug_dev_size_mb == DEF_DEV_SIZE_PRE_INIT)

		sdebug_dev_size_mb = DEF_DEV_SIZE_MB;

	if (sdebug_dev_size_mb < 1)

		sdebug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */

	sz = (unsigned long)sdebug_dev_size_mb * 1048576;

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