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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: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Douglas Gilbert 2020-04-22 19:42:17 +09:00 committed by Martin K. Petersen
parent f0d1cf9378
commit 9267e0eb41
1 changed files with 78 additions and 3 deletions
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81
drivers/scsi/scsi_debug.c
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@ -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;