1 /*******************************************************************************
2 * Filename: target_core_tmr.c
4 * This file contains SPC-3 task management infrastructure
6 * (c) Copyright 2009-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/list.h>
29 #include <linux/export.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_backend.h>
35 #include <target/target_core_fabric.h>
36 #include <target/target_core_configfs.h>
38 #include "target_core_internal.h"
39 #include "target_core_alua.h"
40 #include "target_core_pr.h"
42 int core_tmr_alloc_req(
43 struct se_cmd
*se_cmd
,
48 struct se_tmr_req
*tmr
;
50 tmr
= kzalloc(sizeof(struct se_tmr_req
), gfp_flags
);
52 pr_err("Unable to allocate struct se_tmr_req\n");
56 se_cmd
->se_cmd_flags
|= SCF_SCSI_TMR_CDB
;
57 se_cmd
->se_tmr_req
= tmr
;
58 tmr
->task_cmd
= se_cmd
;
59 tmr
->fabric_tmr_ptr
= fabric_tmr_ptr
;
60 tmr
->function
= function
;
61 INIT_LIST_HEAD(&tmr
->tmr_list
);
65 EXPORT_SYMBOL(core_tmr_alloc_req
);
67 void core_tmr_release_req(struct se_tmr_req
*tmr
)
69 struct se_device
*dev
= tmr
->tmr_dev
;
73 spin_lock_irqsave(&dev
->se_tmr_lock
, flags
);
74 list_del(&tmr
->tmr_list
);
75 spin_unlock_irqrestore(&dev
->se_tmr_lock
, flags
);
81 static void core_tmr_handle_tas_abort(
82 struct se_node_acl
*tmr_nacl
,
88 * TASK ABORTED status (TAS) bit support
90 if ((tmr_nacl
&& (tmr_nacl
!= cmd
->se_sess
->se_node_acl
)) && tas
) {
92 transport_send_task_abort(cmd
);
95 transport_cmd_finish_abort(cmd
, remove
);
98 static int target_check_cdb_and_preempt(struct list_head
*list
,
101 struct t10_pr_registration
*reg
;
105 list_for_each_entry(reg
, list
, pr_reg_abort_list
) {
106 if (reg
->pr_res_key
== cmd
->pr_res_key
)
113 void core_tmr_abort_task(
114 struct se_device
*dev
,
115 struct se_tmr_req
*tmr
,
116 struct se_session
*se_sess
)
118 struct se_cmd
*se_cmd
, *tmp_cmd
;
122 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
123 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
124 &se_sess
->sess_cmd_list
, se_cmd_list
) {
126 if (dev
!= se_cmd
->se_dev
)
129 /* skip se_cmd associated with tmr */
130 if (tmr
->task_cmd
== se_cmd
)
133 ref_tag
= se_cmd
->se_tfo
->get_task_tag(se_cmd
);
134 if (tmr
->ref_task_tag
!= ref_tag
)
137 printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
138 se_cmd
->se_tfo
->get_fabric_name(), ref_tag
);
140 spin_lock(&se_cmd
->t_state_lock
);
141 if (se_cmd
->transport_state
& CMD_T_COMPLETE
) {
142 printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag
);
143 spin_unlock(&se_cmd
->t_state_lock
);
144 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
147 se_cmd
->transport_state
|= CMD_T_ABORTED
;
148 spin_unlock(&se_cmd
->t_state_lock
);
150 list_del_init(&se_cmd
->se_cmd_list
);
151 kref_get(&se_cmd
->cmd_kref
);
152 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
154 cancel_work_sync(&se_cmd
->work
);
155 transport_wait_for_tasks(se_cmd
);
157 target_put_sess_cmd(se_sess
, se_cmd
);
158 transport_cmd_finish_abort(se_cmd
, true);
160 printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
161 " ref_tag: %d\n", ref_tag
);
162 tmr
->response
= TMR_FUNCTION_COMPLETE
;
165 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
168 printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n",
170 tmr
->response
= TMR_TASK_DOES_NOT_EXIST
;
173 static void core_tmr_drain_tmr_list(
174 struct se_device
*dev
,
175 struct se_tmr_req
*tmr
,
176 struct list_head
*preempt_and_abort_list
)
178 LIST_HEAD(drain_tmr_list
);
179 struct se_tmr_req
*tmr_p
, *tmr_pp
;
183 * Release all pending and outgoing TMRs aside from the received
186 spin_lock_irqsave(&dev
->se_tmr_lock
, flags
);
187 list_for_each_entry_safe(tmr_p
, tmr_pp
, &dev
->dev_tmr_list
, tmr_list
) {
189 * Allow the received TMR to return with FUNCTION_COMPLETE.
194 cmd
= tmr_p
->task_cmd
;
196 pr_err("Unable to locate struct se_cmd for TMR\n");
200 * If this function was called with a valid pr_res_key
201 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
202 * skip non regisration key matching TMRs.
204 if (target_check_cdb_and_preempt(preempt_and_abort_list
, cmd
))
207 spin_lock(&cmd
->t_state_lock
);
208 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
209 spin_unlock(&cmd
->t_state_lock
);
212 if (cmd
->t_state
== TRANSPORT_ISTATE_PROCESSING
) {
213 spin_unlock(&cmd
->t_state_lock
);
216 spin_unlock(&cmd
->t_state_lock
);
218 list_move_tail(&tmr_p
->tmr_list
, &drain_tmr_list
);
220 spin_unlock_irqrestore(&dev
->se_tmr_lock
, flags
);
222 list_for_each_entry_safe(tmr_p
, tmr_pp
, &drain_tmr_list
, tmr_list
) {
223 list_del_init(&tmr_p
->tmr_list
);
224 cmd
= tmr_p
->task_cmd
;
226 pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
227 " Response: 0x%02x, t_state: %d\n",
228 (preempt_and_abort_list
) ? "Preempt" : "", tmr_p
,
229 tmr_p
->function
, tmr_p
->response
, cmd
->t_state
);
231 transport_cmd_finish_abort(cmd
, 1);
235 static void core_tmr_drain_state_list(
236 struct se_device
*dev
,
237 struct se_cmd
*prout_cmd
,
238 struct se_node_acl
*tmr_nacl
,
240 struct list_head
*preempt_and_abort_list
)
242 LIST_HEAD(drain_task_list
);
243 struct se_cmd
*cmd
, *next
;
247 * Complete outstanding commands with TASK_ABORTED SAM status.
249 * This is following sam4r17, section 5.6 Aborting commands, Table 38
252 * a) "Yes" indicates that each command that is aborted on an I_T nexus
253 * other than the one that caused the SCSI device condition is
254 * completed with TASK ABORTED status, if the TAS bit is set to one in
255 * the Control mode page (see SPC-4). "No" indicates that no status is
256 * returned for aborted commands.
258 * d) If the logical unit reset is caused by a particular I_T nexus
259 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
260 * (TASK_ABORTED status) applies.
262 * Otherwise (e.g., if triggered by a hard reset), "no"
263 * (no TASK_ABORTED SAM status) applies.
265 * Note that this seems to be independent of TAS (Task Aborted Status)
266 * in the Control Mode Page.
268 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
269 list_for_each_entry_safe(cmd
, next
, &dev
->state_list
, state_list
) {
271 * For PREEMPT_AND_ABORT usage, only process commands
272 * with a matching reservation key.
274 if (target_check_cdb_and_preempt(preempt_and_abort_list
, cmd
))
278 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
280 if (prout_cmd
== cmd
)
283 list_move_tail(&cmd
->state_list
, &drain_task_list
);
284 cmd
->state_active
= false;
286 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
288 while (!list_empty(&drain_task_list
)) {
289 cmd
= list_entry(drain_task_list
.next
, struct se_cmd
, state_list
);
290 list_del(&cmd
->state_list
);
292 pr_debug("LUN_RESET: %s cmd: %p"
293 " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
295 (preempt_and_abort_list
) ? "Preempt" : "", cmd
,
296 cmd
->se_tfo
->get_task_tag(cmd
), 0,
297 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
299 pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
300 " -- CMD_T_ACTIVE: %d"
301 " CMD_T_STOP: %d CMD_T_SENT: %d\n",
302 cmd
->se_tfo
->get_task_tag(cmd
), cmd
->pr_res_key
,
303 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
304 (cmd
->transport_state
& CMD_T_STOP
) != 0,
305 (cmd
->transport_state
& CMD_T_SENT
) != 0);
308 * If the command may be queued onto a workqueue cancel it now.
310 * This is equivalent to removal from the execute queue in the
311 * loop above, but we do it down here given that
312 * cancel_work_sync may block.
314 if (cmd
->t_state
== TRANSPORT_COMPLETE
)
315 cancel_work_sync(&cmd
->work
);
317 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
318 target_stop_cmd(cmd
, &flags
);
320 cmd
->transport_state
|= CMD_T_ABORTED
;
321 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
323 core_tmr_handle_tas_abort(tmr_nacl
, cmd
, tas
);
327 int core_tmr_lun_reset(
328 struct se_device
*dev
,
329 struct se_tmr_req
*tmr
,
330 struct list_head
*preempt_and_abort_list
,
331 struct se_cmd
*prout_cmd
)
333 struct se_node_acl
*tmr_nacl
= NULL
;
334 struct se_portal_group
*tmr_tpg
= NULL
;
337 * TASK_ABORTED status bit, this is configurable via ConfigFS
338 * struct se_device attributes. spc4r17 section 7.4.6 Control mode page
340 * A task aborted status (TAS) bit set to zero specifies that aborted
341 * tasks shall be terminated by the device server without any response
342 * to the application client. A TAS bit set to one specifies that tasks
343 * aborted by the actions of an I_T nexus other than the I_T nexus on
344 * which the command was received shall be completed with TASK ABORTED
345 * status (see SAM-4).
347 tas
= dev
->dev_attrib
.emulate_tas
;
349 * Determine if this se_tmr is coming from a $FABRIC_MOD
350 * or struct se_device passthrough..
352 if (tmr
&& tmr
->task_cmd
&& tmr
->task_cmd
->se_sess
) {
353 tmr_nacl
= tmr
->task_cmd
->se_sess
->se_node_acl
;
354 tmr_tpg
= tmr
->task_cmd
->se_sess
->se_tpg
;
355 if (tmr_nacl
&& tmr_tpg
) {
356 pr_debug("LUN_RESET: TMR caller fabric: %s"
357 " initiator port %s\n",
358 tmr_tpg
->se_tpg_tfo
->get_fabric_name(),
359 tmr_nacl
->initiatorname
);
362 pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
363 (preempt_and_abort_list
) ? "Preempt" : "TMR",
364 dev
->transport
->name
, tas
);
366 core_tmr_drain_tmr_list(dev
, tmr
, preempt_and_abort_list
);
367 core_tmr_drain_state_list(dev
, prout_cmd
, tmr_nacl
, tas
,
368 preempt_and_abort_list
);
371 * Clear any legacy SPC-2 reservation when called during
374 if (!preempt_and_abort_list
&&
375 (dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
)) {
376 spin_lock(&dev
->dev_reservation_lock
);
377 dev
->dev_reserved_node_acl
= NULL
;
378 dev
->dev_reservation_flags
&= ~DRF_SPC2_RESERVATIONS
;
379 spin_unlock(&dev
->dev_reservation_lock
);
380 pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
383 atomic_long_inc(&dev
->num_resets
);
385 pr_debug("LUN_RESET: %s for [%s] Complete\n",
386 (preempt_and_abort_list
) ? "Preempt" : "TMR",
387 dev
->transport
->name
);