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target: Introduce a function that shows the command state

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Introduce target_show_cmd() and use it where appropriate. If
transport_wait_for_tasks() takes too long, make it show the
state of the command it is waiting for.

(Add missing brackets around multi-line conditions - nab)

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: David Disseldorp <ddiss@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bart Van Assche 2017-05-23 16:48:28 -07:00 committed by Nicholas Bellinger
parent 03db016a1b
commit c00e622023
3 changed files with 114 additions and 27 deletions
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18
drivers/target/target_core_tmr.c
View File

@ -355,20 +355,10 @@ static void core_tmr_drain_state_list(
cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
list_del_init(&cmd->state_list);
pr_debug("LUN_RESET: %s cmd: %p"
" ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
"cdb: 0x%02x\n",
(preempt_and_abort_list) ? "Preempt" : "", cmd,
cmd->tag, 0,
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
cmd->t_task_cdb[0]);
pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
" -- CMD_T_ACTIVE: %d"
" CMD_T_STOP: %d CMD_T_SENT: %d\n",
cmd->tag, cmd->pr_res_key,
(cmd->transport_state & CMD_T_ACTIVE) != 0,
(cmd->transport_state & CMD_T_STOP) != 0,
(cmd->transport_state & CMD_T_SENT) != 0);
target_show_cmd("LUN_RESET: ", cmd);
pr_debug("LUN_RESET: ITT[0x%08llx] - %s pr_res_key: 0x%016Lx\n",
cmd->tag, (preempt_and_abort_list) ? "preempt" : "",
cmd->pr_res_key);
/*
* If the command may be queued onto a workqueue cancel it now.

122
drivers/target/target_core_transport.c
View File

@ -1704,15 +1704,9 @@ void transport_generic_request_failure(struct se_cmd *cmd,
if (transport_check_aborted_status(cmd, 1))
return;
pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
" CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
cmd->se_tfo->get_cmd_state(cmd),
cmd->t_state, sense_reason);
pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
(cmd->transport_state & CMD_T_ACTIVE) != 0,
(cmd->transport_state & CMD_T_STOP) != 0,
(cmd->transport_state & CMD_T_SENT) != 0);
pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
sense_reason);
target_show_cmd("-----[ ", cmd);
/*
* For SAM Task Attribute emulation for failed struct se_cmd
@ -2705,6 +2699,108 @@ int target_put_sess_cmd(struct se_cmd *se_cmd)
}
EXPORT_SYMBOL(target_put_sess_cmd);
static const char *data_dir_name(enum dma_data_direction d)
{
switch (d) {
case DMA_BIDIRECTIONAL: return "BIDI";
case DMA_TO_DEVICE: return "WRITE";
case DMA_FROM_DEVICE: return "READ";
case DMA_NONE: return "NONE";
}
return "(?)";
}
static const char *cmd_state_name(enum transport_state_table t)
{
switch (t) {
case TRANSPORT_NO_STATE: return "NO_STATE";
case TRANSPORT_NEW_CMD: return "NEW_CMD";
case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING";
case TRANSPORT_PROCESSING: return "PROCESSING";
case TRANSPORT_COMPLETE: return "COMPLETE";
case TRANSPORT_ISTATE_PROCESSING:
return "ISTATE_PROCESSING";
case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP";
case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK";
case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR";
}
return "(?)";
}
static void target_append_str(char **str, const char *txt)
{
char *prev = *str;
*str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) :
kstrdup(txt, GFP_ATOMIC);
kfree(prev);
}
/*
* Convert a transport state bitmask into a string. The caller is
* responsible for freeing the returned pointer.
*/
static char *target_ts_to_str(u32 ts)
{
char *str = NULL;
if (ts & CMD_T_ABORTED)
target_append_str(&str, "aborted");
if (ts & CMD_T_ACTIVE)
target_append_str(&str, "active");
if (ts & CMD_T_COMPLETE)
target_append_str(&str, "complete");
if (ts & CMD_T_SENT)
target_append_str(&str, "sent");
if (ts & CMD_T_STOP)
target_append_str(&str, "stop");
if (ts & CMD_T_FABRIC_STOP)
target_append_str(&str, "fabric_stop");
return str;
}
static const char *target_tmf_name(enum tcm_tmreq_table tmf)
{
switch (tmf) {
case TMR_ABORT_TASK: return "ABORT_TASK";
case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET";
case TMR_CLEAR_ACA: return "CLEAR_ACA";
case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET";
case TMR_LUN_RESET: return "LUN_RESET";
case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
case TMR_UNKNOWN: break;
}
return "(?)";
}
void target_show_cmd(const char *pfx, struct se_cmd *cmd)
{
char *ts_str = target_ts_to_str(cmd->transport_state);
const u8 *cdb = cmd->t_task_cdb;
struct se_tmr_req *tmf = cmd->se_tmr_req;
if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n",
pfx, cdb[0], cdb[1], cmd->tag,
data_dir_name(cmd->data_direction),
cmd->se_tfo->get_cmd_state(cmd),
cmd_state_name(cmd->t_state), cmd->data_length,
kref_read(&cmd->cmd_kref), ts_str);
} else {
pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n",
pfx, target_tmf_name(tmf->function), cmd->tag,
tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd),
cmd_state_name(cmd->t_state),
kref_read(&cmd->cmd_kref), ts_str);
}
kfree(ts_str);
}
EXPORT_SYMBOL(target_show_cmd);
/* target_sess_cmd_list_set_waiting - Flag all commands in
* sess_cmd_list to complete cmd_wait_comp. Set
* sess_tearing_down so no more commands are queued.
@ -2849,13 +2945,13 @@ __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
cmd->transport_state |= CMD_T_STOP;
pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
" t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
target_show_cmd("wait_for_tasks: Stopping ", cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
wait_for_completion(&cmd->t_transport_stop_comp);
while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp,
180 * HZ))
target_show_cmd("wait for tasks: ", cmd);
spin_lock_irqsave(&cmd->t_state_lock, *flags);
cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);

1
include/target/target_core_fabric.h
View File

@ -160,6 +160,7 @@ int target_get_sess_cmd(struct se_cmd *, bool);
int target_put_sess_cmd(struct se_cmd *);
void target_sess_cmd_list_set_waiting(struct se_session *);
void target_wait_for_sess_cmds(struct se_session *);
void target_show_cmd(const char *pfx, struct se_cmd *cmd);
int core_alua_check_nonop_delay(struct se_cmd *);