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scsi: scsi_debug: Add zone_size_mb module parameter

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Add the zone_size_mb module parameters to control the zone size of a ZBC
device. If the zone size specified is not a divisor of the device capacity,
the last zone of the device will be created as a smaller "runt" zone. This
parameter is ignored for device types other than 0x14 (zbc=2 case).

Note: for testing purposes, zone sizes that are not a power of 2 are
accepted but will result in the drive being rejected by the sd driver.

Link: https://lore.kernel.org/r/20200422104221.378203-7-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:
Damien Le Moal 2020-04-22 19:42:20 +09:00 committed by Martin K. Petersen
parent aa8fecf96b
commit 98e0a68986
1 changed files with 7 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/scsi/scsi_debug.c
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@ -823,7 +823,7 @@ static int dif_errors;
/* ZBC global data */
static bool sdeb_zbc_in_use; /* true when ptype=TYPE_ZBC [0x14] */
static const int zbc_zone_size_mb;
static int sdeb_zbc_zone_size_mb;
static int sdeb_zbc_max_open = DEF_ZBC_MAX_OPEN_ZONES;
static int sdeb_zbc_nr_conv = DEF_ZBC_NR_CONV_ZONES;
@ -4763,12 +4763,12 @@ static int sdebug_device_create_zones(struct sdebug_dev_info *devip)
unsigned int i;
/*
* Set the zone size: if zbc_zone_size_mb is not set, figure out a
* zone size allowing for at least 4 zones on the device. Otherwise,
* Set the zone size: if sdeb_zbc_zone_size_mb is not set, figure out
* a zone size allowing for at least 4 zones on the device. Otherwise,
* use the specified zone size checking that at least 2 zones can be
* created for the device.
*/
if (!zbc_zone_size_mb) {
if (!sdeb_zbc_zone_size_mb) {
devip->zsize = (DEF_ZBC_ZONE_SIZE_MB * SZ_1M)
>> ilog2(sdebug_sector_size);
while (capacity < devip->zsize << 2 && devip->zsize >= 2)
@ -4778,7 +4778,7 @@ static int sdebug_device_create_zones(struct sdebug_dev_info *devip)
return -EINVAL;
}
} else {
devip->zsize = (zbc_zone_size_mb * SZ_1M)
devip->zsize = (sdeb_zbc_zone_size_mb * SZ_1M)
>> ilog2(sdebug_sector_size);
if (devip->zsize >= capacity) {
pr_err("Zone size too large for device capacity\n");
@ -5551,6 +5551,7 @@ module_param_named(write_same_length, sdebug_write_same_length, int,
module_param_named(zbc, sdeb_zbc_model_s, charp, S_IRUGO);
module_param_named(zone_max_open, sdeb_zbc_max_open, int, S_IRUGO);
module_param_named(zone_nr_conv, sdeb_zbc_nr_conv, int, S_IRUGO);
module_param_named(zone_size_mb, sdeb_zbc_zone_size_mb, int, S_IRUGO);
MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
MODULE_DESCRIPTION("SCSI debug adapter driver");
@ -5615,6 +5616,7 @@ MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xff
MODULE_PARM_DESC(zbc, "'none' [0]; 'aware' [1]; 'managed' [2] (def=0). Can have 'host-' prefix");
MODULE_PARM_DESC(zone_max_open, "Maximum number of open zones; [0] for no limit (def=auto)");
MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones (def=1)");
MODULE_PARM_DESC(zone_size_mb, "Zone size in MiB (def=auto)");
#define SDEBUG_INFO_LEN 256
static char sdebug_info[SDEBUG_INFO_LEN];