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scsi: scsi_debug: Maintain write statistics per group number

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Track per GROUP NUMBER how many write commands have been processed. Make
this information available in sysfs. Reset these statistics if any data
is written into the sysfs attribute.

Note: SCSI devices should only interpret the information in the GROUP
NUMBER field as a stream identifier if the ST_ENBLE bit has been set to
one. This patch follows a simpler approach: count the number of writes
per GROUP NUMBER whether or not the group number represents a stream
identifier.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240130214911.1863909-20-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2024-01-30 13:48:45 -08:00 committed by Martin K. Petersen
parent ad620becda
commit af180c0880
1 changed files with 45 additions and 4 deletions
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49
drivers/scsi/scsi_debug.c
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@ -902,6 +902,8 @@ static int sdeb_zbc_nr_conv = DEF_ZBC_NR_CONV_ZONES;
static int submit_queues = DEF_SUBMIT_QUEUES; /* > 1 for multi-queue (mq) */
static int poll_queues; /* iouring iopoll interface.*/
static atomic_long_t writes_by_group_number[64];
static char sdebug_proc_name[] = MY_NAME;
static const char *my_name = MY_NAME;
@ -3377,7 +3379,8 @@ static inline struct sdeb_store_info *devip2sip(struct sdebug_dev_info *devip,
/* Returns number of bytes copied or -1 if error. */
static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp,
u32 sg_skip, u64 lba, u32 num, bool do_write)
u32 sg_skip, u64 lba, u32 num, bool do_write,
u8 group_number)
{
int ret;
u64 block, rest = 0;
@ -3396,6 +3399,10 @@ static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp,
return 0;
if (scp->sc_data_direction != dir)
return -1;
if (do_write && group_number < ARRAY_SIZE(writes_by_group_number))
atomic_long_inc(&writes_by_group_number[group_number]);
fsp = sip->storep;
block = do_div(lba, sdebug_store_sectors);
@ -3769,7 +3776,7 @@ static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
}
}
ret = do_device_access(sip, scp, 0, lba, num, false);
ret = do_device_access(sip, scp, 0, lba, num, false, 0);
sdeb_read_unlock(sip);
if (unlikely(ret == -1))
return DID_ERROR << 16;
@ -3954,6 +3961,7 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
{
bool check_prot;
u32 num;
u8 group = 0;
u32 ei_lba;
int ret;
u64 lba;
@ -3965,11 +3973,13 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
ei_lba = 0;
lba = get_unaligned_be64(cmd + 2);
num = get_unaligned_be32(cmd + 10);
group = cmd[14] & 0x3f;
check_prot = true;
break;
case WRITE_10:
ei_lba = 0;
lba = get_unaligned_be32(cmd + 2);
group = cmd[6] & 0x3f;
num = get_unaligned_be16(cmd + 7);
check_prot = true;
break;
@ -3984,15 +3994,18 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
ei_lba = 0;
lba = get_unaligned_be32(cmd + 2);
num = get_unaligned_be32(cmd + 6);
group = cmd[6] & 0x3f;
check_prot = true;
break;
case 0x53: /* XDWRITEREAD(10) */
ei_lba = 0;
lba = get_unaligned_be32(cmd + 2);
group = cmd[6] & 0x1f;
num = get_unaligned_be16(cmd + 7);
check_prot = false;
break;
default: /* assume WRITE(32) */
group = cmd[6] & 0x3f;
lba = get_unaligned_be64(cmd + 12);
ei_lba = get_unaligned_be32(cmd + 20);
num = get_unaligned_be32(cmd + 28);
@ -4047,7 +4060,7 @@ static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
}
}
ret = do_device_access(sip, scp, 0, lba, num, true);
ret = do_device_access(sip, scp, 0, lba, num, true, group);
if (unlikely(scsi_debug_lbp()))
map_region(sip, lba, num);
/* If ZBC zone then bump its write pointer */
@ -4099,12 +4112,14 @@ static int resp_write_scat(struct scsi_cmnd *scp,
u32 lb_size = sdebug_sector_size;
u32 ei_lba;
u64 lba;
u8 group;
int ret, res;
bool is_16;
static const u32 lrd_size = 32; /* + parameter list header size */
if (cmd[0] == VARIABLE_LENGTH_CMD) {
is_16 = false;
group = cmd[6] & 0x3f;
wrprotect = (cmd[10] >> 5) & 0x7;
lbdof = get_unaligned_be16(cmd + 12);
num_lrd = get_unaligned_be16(cmd + 16);
@ -4115,6 +4130,7 @@ static int resp_write_scat(struct scsi_cmnd *scp,
lbdof = get_unaligned_be16(cmd + 4);
num_lrd = get_unaligned_be16(cmd + 8);
bt_len = get_unaligned_be32(cmd + 10);
group = cmd[14] & 0x3f;
if (unlikely(have_dif_prot)) {
if (sdebug_dif == T10_PI_TYPE2_PROTECTION &&
wrprotect) {
@ -4203,7 +4219,7 @@ static int resp_write_scat(struct scsi_cmnd *scp,
}
}
ret = do_device_access(sip, scp, sg_off, lba, num, true);
ret = do_device_access(sip, scp, sg_off, lba, num, true, group);
/* If ZBC zone then bump its write pointer */
if (sdebug_dev_is_zoned(devip))
zbc_inc_wp(devip, lba, num);
@ -7298,6 +7314,30 @@ static ssize_t tur_ms_to_ready_show(struct device_driver *ddp, char *buf)
}
static DRIVER_ATTR_RO(tur_ms_to_ready);
static ssize_t group_number_stats_show(struct device_driver *ddp, char *buf)
{
char *p = buf, *end = buf + PAGE_SIZE;
int i;
for (i = 0; i < ARRAY_SIZE(writes_by_group_number); i++)
p += scnprintf(p, end - p, "%d %ld\n", i,
atomic_long_read(&writes_by_group_number[i]));
return p - buf;
}
static ssize_t group_number_stats_store(struct device_driver *ddp,
const char *buf, size_t count)
{
int i;
for (i = 0; i < ARRAY_SIZE(writes_by_group_number); i++)
atomic_long_set(&writes_by_group_number[i], 0);
return count;
}
static DRIVER_ATTR_RW(group_number_stats);
/* Note: The following array 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
@ -7344,6 +7384,7 @@ static struct attribute *sdebug_drv_attrs[] = {
&driver_attr_cdb_len.attr,
&driver_attr_tur_ms_to_ready.attr,
&driver_attr_zbc.attr,
&driver_attr_group_number_stats.attr,
NULL,
};
ATTRIBUTE_GROUPS(sdebug_drv);