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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * Filename: target_core_tmr.c
4 *
5 * This file contains SPC-3 task management infrastructure
6 *
7 * (c) Copyright 2009-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 ******************************************************************************/
12
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/list.h>
16#include <linux/export.h>
17
18#include <target/target_core_base.h>
19#include <target/target_core_backend.h>
20#include <target/target_core_fabric.h>
21
22#include "target_core_internal.h"
23#include "target_core_alua.h"
24#include "target_core_pr.h"
25
26int core_tmr_alloc_req(
27 struct se_cmd *se_cmd,
28 void *fabric_tmr_ptr,
29 u8 function,
30 gfp_t gfp_flags)
31{
32 struct se_tmr_req *tmr;
33
34 tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
35 if (!tmr) {
36 pr_err("Unable to allocate struct se_tmr_req\n");
37 return -ENOMEM;
38 }
39
40 se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
41 se_cmd->se_tmr_req = tmr;
42 tmr->task_cmd = se_cmd;
43 tmr->fabric_tmr_ptr = fabric_tmr_ptr;
44 tmr->function = function;
45 INIT_LIST_HEAD(&tmr->tmr_list);
46
47 return 0;
48}
49EXPORT_SYMBOL(core_tmr_alloc_req);
50
51void core_tmr_release_req(struct se_tmr_req *tmr)
52{
53 kfree(tmr);
54}
55
56static int target_check_cdb_and_preempt(struct list_head *list,
57 struct se_cmd *cmd)
58{
59 struct t10_pr_registration *reg;
60
61 if (!list)
62 return 0;
63 list_for_each_entry(reg, list, pr_reg_abort_list) {
64 if (reg->pr_res_key == cmd->pr_res_key)
65 return 0;
66 }
67
68 return 1;
69}
70
71static bool __target_check_io_state(struct se_cmd *se_cmd,
72 struct se_session *tmr_sess, bool tas)
73{
74 struct se_session *sess = se_cmd->se_sess;
75
76 lockdep_assert_held(&sess->sess_cmd_lock);
77
78 /*
79 * If command already reached CMD_T_COMPLETE state within
80 * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown,
81 * this se_cmd has been passed to fabric driver and will
82 * not be aborted.
83 *
84 * Otherwise, obtain a local se_cmd->cmd_kref now for TMR
85 * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as
86 * long as se_cmd->cmd_kref is still active unless zero.
87 */
88 spin_lock(&se_cmd->t_state_lock);
89 if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) {
90 pr_debug("Attempted to abort io tag: %llu already complete or"
91 " fabric stop, skipping\n", se_cmd->tag);
92 spin_unlock(&se_cmd->t_state_lock);
93 return false;
94 }
95 se_cmd->transport_state |= CMD_T_ABORTED;
96
97 if ((tmr_sess != se_cmd->se_sess) && tas)
98 se_cmd->transport_state |= CMD_T_TAS;
99
100 spin_unlock(&se_cmd->t_state_lock);
101
102 return kref_get_unless_zero(&se_cmd->cmd_kref);
103}
104
105void core_tmr_abort_task(
106 struct se_device *dev,
107 struct se_tmr_req *tmr,
108 struct se_session *se_sess)
109{
110 LIST_HEAD(aborted_list);
111 struct se_cmd *se_cmd, *next;
112 unsigned long flags;
113 bool rc;
114 u64 ref_tag;
115 int i;
116
117 for (i = 0; i < dev->queue_cnt; i++) {
118 flush_work(&dev->queues[i].sq.work);
119
120 spin_lock_irqsave(&dev->queues[i].lock, flags);
121 list_for_each_entry_safe(se_cmd, next, &dev->queues[i].state_list,
122 state_list) {
123 if (se_sess != se_cmd->se_sess)
124 continue;
125
126 /*
127 * skip task management functions, including
128 * tmr->task_cmd
129 */
130 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
131 continue;
132
133 ref_tag = se_cmd->tag;
134 if (tmr->ref_task_tag != ref_tag)
135 continue;
136
137 pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n",
138 se_cmd->se_tfo->fabric_name, ref_tag);
139
140 spin_lock(&se_sess->sess_cmd_lock);
141 rc = __target_check_io_state(se_cmd, se_sess, 0);
142 spin_unlock(&se_sess->sess_cmd_lock);
143 if (!rc)
144 continue;
145
146 list_move_tail(&se_cmd->state_list, &aborted_list);
147 se_cmd->state_active = false;
148 spin_unlock_irqrestore(&dev->queues[i].lock, flags);
149
150 if (dev->transport->tmr_notify)
151 dev->transport->tmr_notify(dev, TMR_ABORT_TASK,
152 &aborted_list);
153
154 list_del_init(&se_cmd->state_list);
155 target_put_cmd_and_wait(se_cmd);
156
157 pr_err("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for ref_tag: %llu\n",
158 ref_tag);
159 tmr->response = TMR_FUNCTION_COMPLETE;
160 atomic_long_inc(&dev->aborts_complete);
161 return;
162 }
163 spin_unlock_irqrestore(&dev->queues[i].lock, flags);
164 }
165
166 if (dev->transport->tmr_notify)
167 dev->transport->tmr_notify(dev, TMR_ABORT_TASK, &aborted_list);
168
169 printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
170 tmr->ref_task_tag);
171 tmr->response = TMR_TASK_DOES_NOT_EXIST;
172 atomic_long_inc(&dev->aborts_no_task);
173}
174
175static void core_tmr_drain_tmr_list(
176 struct se_device *dev,
177 struct se_tmr_req *tmr,
178 struct list_head *preempt_and_abort_list)
179{
180 LIST_HEAD(drain_tmr_list);
181 struct se_session *sess;
182 struct se_tmr_req *tmr_p, *tmr_pp;
183 struct se_cmd *cmd;
184 unsigned long flags;
185 bool rc;
186 /*
187 * Release all pending and outgoing TMRs aside from the received
188 * LUN_RESET tmr..
189 */
190 spin_lock_irqsave(&dev->se_tmr_lock, flags);
191 if (tmr)
192 list_del_init(&tmr->tmr_list);
193 list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
194 cmd = tmr_p->task_cmd;
195 if (!cmd) {
196 pr_err("Unable to locate struct se_cmd for TMR\n");
197 continue;
198 }
199 /*
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 registration key matching TMRs.
203 */
204 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
205 continue;
206
207 sess = cmd->se_sess;
208 if (WARN_ON_ONCE(!sess))
209 continue;
210
211 spin_lock(&sess->sess_cmd_lock);
212 rc = __target_check_io_state(cmd, sess, 0);
213 spin_unlock(&sess->sess_cmd_lock);
214
215 if (!rc) {
216 printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n");
217 continue;
218 }
219
220 list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
221 tmr_p->tmr_dev = NULL;
222 }
223 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
224
225 list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
226 list_del_init(&tmr_p->tmr_list);
227 cmd = tmr_p->task_cmd;
228
229 pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
230 " Response: 0x%02x, t_state: %d\n",
231 (preempt_and_abort_list) ? "Preempt" : "", tmr_p,
232 tmr_p->function, tmr_p->response, cmd->t_state);
233
234 target_put_cmd_and_wait(cmd);
235 }
236}
237
238/**
239 * core_tmr_drain_state_list() - abort SCSI commands associated with a device
240 *
241 * @dev: Device for which to abort outstanding SCSI commands.
242 * @prout_cmd: Pointer to the SCSI PREEMPT AND ABORT if this function is called
243 * to realize the PREEMPT AND ABORT functionality.
244 * @tmr_sess: Session through which the LUN RESET has been received.
245 * @tas: Task Aborted Status (TAS) bit from the SCSI control mode page.
246 * A quote from SPC-4, paragraph "7.5.10 Control mode page":
247 * "A task aborted status (TAS) bit set to zero specifies that
248 * aborted commands shall be terminated by the device server
249 * without any response to the application client. A TAS bit set
250 * to one specifies that commands aborted by the actions of an I_T
251 * nexus other than the I_T nexus on which the command was
252 * received shall be completed with TASK ABORTED status."
253 * @preempt_and_abort_list: For the PREEMPT AND ABORT functionality, a list
254 * with registrations that will be preempted.
255 */
256static void core_tmr_drain_state_list(
257 struct se_device *dev,
258 struct se_cmd *prout_cmd,
259 struct se_session *tmr_sess,
260 bool tas,
261 struct list_head *preempt_and_abort_list)
262{
263 LIST_HEAD(drain_task_list);
264 struct se_session *sess;
265 struct se_cmd *cmd, *next;
266 unsigned long flags;
267 int rc, i;
268
269 /*
270 * Complete outstanding commands with TASK_ABORTED SAM status.
271 *
272 * This is following sam4r17, section 5.6 Aborting commands, Table 38
273 * for TMR LUN_RESET:
274 *
275 * a) "Yes" indicates that each command that is aborted on an I_T nexus
276 * other than the one that caused the SCSI device condition is
277 * completed with TASK ABORTED status, if the TAS bit is set to one in
278 * the Control mode page (see SPC-4). "No" indicates that no status is
279 * returned for aborted commands.
280 *
281 * d) If the logical unit reset is caused by a particular I_T nexus
282 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
283 * (TASK_ABORTED status) applies.
284 *
285 * Otherwise (e.g., if triggered by a hard reset), "no"
286 * (no TASK_ABORTED SAM status) applies.
287 *
288 * Note that this seems to be independent of TAS (Task Aborted Status)
289 * in the Control Mode Page.
290 */
291 for (i = 0; i < dev->queue_cnt; i++) {
292 flush_work(&dev->queues[i].sq.work);
293
294 spin_lock_irqsave(&dev->queues[i].lock, flags);
295 list_for_each_entry_safe(cmd, next, &dev->queues[i].state_list,
296 state_list) {
297 /*
298 * For PREEMPT_AND_ABORT usage, only process commands
299 * with a matching reservation key.
300 */
301 if (target_check_cdb_and_preempt(preempt_and_abort_list,
302 cmd))
303 continue;
304
305 /*
306 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
307 */
308 if (prout_cmd == cmd)
309 continue;
310
311 sess = cmd->se_sess;
312 if (WARN_ON_ONCE(!sess))
313 continue;
314
315 spin_lock(&sess->sess_cmd_lock);
316 rc = __target_check_io_state(cmd, tmr_sess, tas);
317 spin_unlock(&sess->sess_cmd_lock);
318 if (!rc)
319 continue;
320
321 list_move_tail(&cmd->state_list, &drain_task_list);
322 cmd->state_active = false;
323 }
324 spin_unlock_irqrestore(&dev->queues[i].lock, flags);
325 }
326
327 if (dev->transport->tmr_notify)
328 dev->transport->tmr_notify(dev, preempt_and_abort_list ?
329 TMR_LUN_RESET_PRO : TMR_LUN_RESET,
330 &drain_task_list);
331
332 while (!list_empty(&drain_task_list)) {
333 cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
334 list_del_init(&cmd->state_list);
335
336 target_show_cmd("LUN_RESET: ", cmd);
337 pr_debug("LUN_RESET: ITT[0x%08llx] - %s pr_res_key: 0x%016Lx\n",
338 cmd->tag, (preempt_and_abort_list) ? "preempt" : "",
339 cmd->pr_res_key);
340
341 target_put_cmd_and_wait(cmd);
342 }
343}
344
345int core_tmr_lun_reset(
346 struct se_device *dev,
347 struct se_tmr_req *tmr,
348 struct list_head *preempt_and_abort_list,
349 struct se_cmd *prout_cmd)
350{
351 struct se_node_acl *tmr_nacl = NULL;
352 struct se_portal_group *tmr_tpg = NULL;
353 struct se_session *tmr_sess = NULL;
354 bool tas;
355 /*
356 * TASK_ABORTED status bit, this is configurable via ConfigFS
357 * struct se_device attributes. spc4r17 section 7.4.6 Control mode page
358 *
359 * A task aborted status (TAS) bit set to zero specifies that aborted
360 * tasks shall be terminated by the device server without any response
361 * to the application client. A TAS bit set to one specifies that tasks
362 * aborted by the actions of an I_T nexus other than the I_T nexus on
363 * which the command was received shall be completed with TASK ABORTED
364 * status (see SAM-4).
365 */
366 tas = dev->dev_attrib.emulate_tas;
367 /*
368 * Determine if this se_tmr is coming from a $FABRIC_MOD
369 * or struct se_device passthrough..
370 */
371 if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
372 tmr_sess = tmr->task_cmd->se_sess;
373 tmr_nacl = tmr_sess->se_node_acl;
374 tmr_tpg = tmr_sess->se_tpg;
375 if (tmr_nacl && tmr_tpg) {
376 pr_debug("LUN_RESET: TMR caller fabric: %s"
377 " initiator port %s\n",
378 tmr_tpg->se_tpg_tfo->fabric_name,
379 tmr_nacl->initiatorname);
380 }
381 }
382 pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
383 (preempt_and_abort_list) ? "Preempt" : "TMR",
384 dev->transport->name, tas);
385
386 core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
387 core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas,
388 preempt_and_abort_list);
389
390 /*
391 * Clear any legacy SPC-2 reservation when called during
392 * LOGICAL UNIT RESET
393 */
394 if (!preempt_and_abort_list &&
395 (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) {
396 spin_lock(&dev->dev_reservation_lock);
397 dev->reservation_holder = NULL;
398 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
399 spin_unlock(&dev->dev_reservation_lock);
400 pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
401 }
402
403 atomic_long_inc(&dev->num_resets);
404
405 pr_debug("LUN_RESET: %s for [%s] Complete\n",
406 (preempt_and_abort_list) ? "Preempt" : "TMR",
407 dev->transport->name);
408 return 0;
409}
410
1/*******************************************************************************
2 * Filename: target_core_tmr.c
3 *
4 * This file contains SPC-3 task management infrastructure
5 *
6 * Copyright (c) 2009,2010 Rising Tide Systems
7 * Copyright (c) 2009,2010 Linux-iSCSI.org
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 *
25 ******************************************************************************/
26
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <linux/list.h>
30#include <linux/export.h>
31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33
34#include <target/target_core_base.h>
35#include <target/target_core_backend.h>
36#include <target/target_core_fabric.h>
37#include <target/target_core_configfs.h>
38
39#include "target_core_internal.h"
40#include "target_core_alua.h"
41#include "target_core_pr.h"
42
43int core_tmr_alloc_req(
44 struct se_cmd *se_cmd,
45 void *fabric_tmr_ptr,
46 u8 function,
47 gfp_t gfp_flags)
48{
49 struct se_tmr_req *tmr;
50
51 tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
52 if (!tmr) {
53 pr_err("Unable to allocate struct se_tmr_req\n");
54 return -ENOMEM;
55 }
56
57 se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
58 se_cmd->se_tmr_req = tmr;
59 tmr->task_cmd = se_cmd;
60 tmr->fabric_tmr_ptr = fabric_tmr_ptr;
61 tmr->function = function;
62 INIT_LIST_HEAD(&tmr->tmr_list);
63
64 return 0;
65}
66EXPORT_SYMBOL(core_tmr_alloc_req);
67
68void core_tmr_release_req(
69 struct se_tmr_req *tmr)
70{
71 struct se_device *dev = tmr->tmr_dev;
72 unsigned long flags;
73
74 if (!dev) {
75 kfree(tmr);
76 return;
77 }
78
79 spin_lock_irqsave(&dev->se_tmr_lock, flags);
80 list_del(&tmr->tmr_list);
81 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
82
83 kfree(tmr);
84}
85
86static void core_tmr_handle_tas_abort(
87 struct se_node_acl *tmr_nacl,
88 struct se_cmd *cmd,
89 int tas,
90 int fe_count)
91{
92 if (!fe_count) {
93 transport_cmd_finish_abort(cmd, 1);
94 return;
95 }
96 /*
97 * TASK ABORTED status (TAS) bit support
98 */
99 if ((tmr_nacl &&
100 (tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
101 transport_send_task_abort(cmd);
102
103 transport_cmd_finish_abort(cmd, 0);
104}
105
106static int target_check_cdb_and_preempt(struct list_head *list,
107 struct se_cmd *cmd)
108{
109 struct t10_pr_registration *reg;
110
111 if (!list)
112 return 0;
113 list_for_each_entry(reg, list, pr_reg_abort_list) {
114 if (reg->pr_res_key == cmd->pr_res_key)
115 return 0;
116 }
117
118 return 1;
119}
120
121void core_tmr_abort_task(
122 struct se_device *dev,
123 struct se_tmr_req *tmr,
124 struct se_session *se_sess)
125{
126 struct se_cmd *se_cmd, *tmp_cmd;
127 unsigned long flags;
128 int ref_tag;
129
130 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
131 list_for_each_entry_safe(se_cmd, tmp_cmd,
132 &se_sess->sess_cmd_list, se_cmd_list) {
133
134 if (dev != se_cmd->se_dev)
135 continue;
136 ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd);
137 if (tmr->ref_task_tag != ref_tag)
138 continue;
139
140 printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
141 se_cmd->se_tfo->get_fabric_name(), ref_tag);
142
143 spin_lock_irq(&se_cmd->t_state_lock);
144 if (se_cmd->transport_state & CMD_T_COMPLETE) {
145 printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag);
146 spin_unlock_irq(&se_cmd->t_state_lock);
147 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
148 goto out;
149 }
150 se_cmd->transport_state |= CMD_T_ABORTED;
151 spin_unlock_irq(&se_cmd->t_state_lock);
152
153 list_del_init(&se_cmd->se_cmd_list);
154 kref_get(&se_cmd->cmd_kref);
155 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
156
157 cancel_work_sync(&se_cmd->work);
158 transport_wait_for_tasks(se_cmd);
159 /*
160 * Now send SAM_STAT_TASK_ABORTED status for the referenced
161 * se_cmd descriptor..
162 */
163 transport_send_task_abort(se_cmd);
164 /*
165 * Also deal with possible extra acknowledge reference..
166 */
167 if (se_cmd->se_cmd_flags & SCF_ACK_KREF)
168 target_put_sess_cmd(se_sess, se_cmd);
169
170 target_put_sess_cmd(se_sess, se_cmd);
171
172 printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
173 " ref_tag: %d\n", ref_tag);
174 tmr->response = TMR_FUNCTION_COMPLETE;
175 return;
176 }
177 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
178
179out:
180 printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n",
181 tmr->ref_task_tag);
182 tmr->response = TMR_TASK_DOES_NOT_EXIST;
183}
184
185static void core_tmr_drain_tmr_list(
186 struct se_device *dev,
187 struct se_tmr_req *tmr,
188 struct list_head *preempt_and_abort_list)
189{
190 LIST_HEAD(drain_tmr_list);
191 struct se_tmr_req *tmr_p, *tmr_pp;
192 struct se_cmd *cmd;
193 unsigned long flags;
194 /*
195 * Release all pending and outgoing TMRs aside from the received
196 * LUN_RESET tmr..
197 */
198 spin_lock_irqsave(&dev->se_tmr_lock, flags);
199 list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
200 /*
201 * Allow the received TMR to return with FUNCTION_COMPLETE.
202 */
203 if (tmr_p == tmr)
204 continue;
205
206 cmd = tmr_p->task_cmd;
207 if (!cmd) {
208 pr_err("Unable to locate struct se_cmd for TMR\n");
209 continue;
210 }
211 /*
212 * If this function was called with a valid pr_res_key
213 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
214 * skip non regisration key matching TMRs.
215 */
216 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
217 continue;
218
219 spin_lock(&cmd->t_state_lock);
220 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
221 spin_unlock(&cmd->t_state_lock);
222 continue;
223 }
224 if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
225 spin_unlock(&cmd->t_state_lock);
226 continue;
227 }
228 spin_unlock(&cmd->t_state_lock);
229
230 list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
231 }
232 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
233
234 list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
235 list_del_init(&tmr_p->tmr_list);
236 cmd = tmr_p->task_cmd;
237
238 pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
239 " Response: 0x%02x, t_state: %d\n",
240 (preempt_and_abort_list) ? "Preempt" : "", tmr_p,
241 tmr_p->function, tmr_p->response, cmd->t_state);
242
243 transport_cmd_finish_abort(cmd, 1);
244 }
245}
246
247static void core_tmr_drain_state_list(
248 struct se_device *dev,
249 struct se_cmd *prout_cmd,
250 struct se_node_acl *tmr_nacl,
251 int tas,
252 struct list_head *preempt_and_abort_list)
253{
254 LIST_HEAD(drain_task_list);
255 struct se_cmd *cmd, *next;
256 unsigned long flags;
257 int fe_count;
258
259 /*
260 * Complete outstanding commands with TASK_ABORTED SAM status.
261 *
262 * This is following sam4r17, section 5.6 Aborting commands, Table 38
263 * for TMR LUN_RESET:
264 *
265 * a) "Yes" indicates that each command that is aborted on an I_T nexus
266 * other than the one that caused the SCSI device condition is
267 * completed with TASK ABORTED status, if the TAS bit is set to one in
268 * the Control mode page (see SPC-4). "No" indicates that no status is
269 * returned for aborted commands.
270 *
271 * d) If the logical unit reset is caused by a particular I_T nexus
272 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
273 * (TASK_ABORTED status) applies.
274 *
275 * Otherwise (e.g., if triggered by a hard reset), "no"
276 * (no TASK_ABORTED SAM status) applies.
277 *
278 * Note that this seems to be independent of TAS (Task Aborted Status)
279 * in the Control Mode Page.
280 */
281 spin_lock_irqsave(&dev->execute_task_lock, flags);
282 list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) {
283 /*
284 * For PREEMPT_AND_ABORT usage, only process commands
285 * with a matching reservation key.
286 */
287 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
288 continue;
289
290 /*
291 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
292 */
293 if (prout_cmd == cmd)
294 continue;
295
296 list_move_tail(&cmd->state_list, &drain_task_list);
297 cmd->state_active = false;
298
299 if (!list_empty(&cmd->execute_list))
300 __target_remove_from_execute_list(cmd);
301 }
302 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
303
304 while (!list_empty(&drain_task_list)) {
305 cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
306 list_del(&cmd->state_list);
307
308 pr_debug("LUN_RESET: %s cmd: %p"
309 " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
310 "cdb: 0x%02x\n",
311 (preempt_and_abort_list) ? "Preempt" : "", cmd,
312 cmd->se_tfo->get_task_tag(cmd), 0,
313 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
314 cmd->t_task_cdb[0]);
315 pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
316 " -- CMD_T_ACTIVE: %d"
317 " CMD_T_STOP: %d CMD_T_SENT: %d\n",
318 cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
319 (cmd->transport_state & CMD_T_ACTIVE) != 0,
320 (cmd->transport_state & CMD_T_STOP) != 0,
321 (cmd->transport_state & CMD_T_SENT) != 0);
322
323 /*
324 * If the command may be queued onto a workqueue cancel it now.
325 *
326 * This is equivalent to removal from the execute queue in the
327 * loop above, but we do it down here given that
328 * cancel_work_sync may block.
329 */
330 if (cmd->t_state == TRANSPORT_COMPLETE)
331 cancel_work_sync(&cmd->work);
332
333 spin_lock_irqsave(&cmd->t_state_lock, flags);
334 target_stop_cmd(cmd, &flags);
335
336 fe_count = atomic_read(&cmd->t_fe_count);
337
338 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
339 pr_debug("LUN_RESET: got CMD_T_ACTIVE for"
340 " cdb: %p, t_fe_count: %d dev: %p\n", cmd,
341 fe_count, dev);
342 cmd->transport_state |= CMD_T_ABORTED;
343 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
344
345 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
346 continue;
347 }
348 pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for cdb: %p,"
349 " t_fe_count: %d dev: %p\n", cmd, fe_count, dev);
350 cmd->transport_state |= CMD_T_ABORTED;
351 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
352
353 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
354 }
355}
356
357static void core_tmr_drain_cmd_list(
358 struct se_device *dev,
359 struct se_cmd *prout_cmd,
360 struct se_node_acl *tmr_nacl,
361 int tas,
362 struct list_head *preempt_and_abort_list)
363{
364 LIST_HEAD(drain_cmd_list);
365 struct se_queue_obj *qobj = &dev->dev_queue_obj;
366 struct se_cmd *cmd, *tcmd;
367 unsigned long flags;
368
369 /*
370 * Release all commands remaining in the per-device command queue.
371 *
372 * This follows the same logic as above for the state list.
373 */
374 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
375 list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
376 /*
377 * For PREEMPT_AND_ABORT usage, only process commands
378 * with a matching reservation key.
379 */
380 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
381 continue;
382 /*
383 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
384 */
385 if (prout_cmd == cmd)
386 continue;
387
388 cmd->transport_state &= ~CMD_T_QUEUED;
389 atomic_dec(&qobj->queue_cnt);
390 list_move_tail(&cmd->se_queue_node, &drain_cmd_list);
391 }
392 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
393
394 while (!list_empty(&drain_cmd_list)) {
395 cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node);
396 list_del_init(&cmd->se_queue_node);
397
398 pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
399 " %d t_fe_count: %d\n", (preempt_and_abort_list) ?
400 "Preempt" : "", cmd, cmd->t_state,
401 atomic_read(&cmd->t_fe_count));
402
403 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
404 atomic_read(&cmd->t_fe_count));
405 }
406}
407
408int core_tmr_lun_reset(
409 struct se_device *dev,
410 struct se_tmr_req *tmr,
411 struct list_head *preempt_and_abort_list,
412 struct se_cmd *prout_cmd)
413{
414 struct se_node_acl *tmr_nacl = NULL;
415 struct se_portal_group *tmr_tpg = NULL;
416 int tas;
417 /*
418 * TASK_ABORTED status bit, this is configurable via ConfigFS
419 * struct se_device attributes. spc4r17 section 7.4.6 Control mode page
420 *
421 * A task aborted status (TAS) bit set to zero specifies that aborted
422 * tasks shall be terminated by the device server without any response
423 * to the application client. A TAS bit set to one specifies that tasks
424 * aborted by the actions of an I_T nexus other than the I_T nexus on
425 * which the command was received shall be completed with TASK ABORTED
426 * status (see SAM-4).
427 */
428 tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
429 /*
430 * Determine if this se_tmr is coming from a $FABRIC_MOD
431 * or struct se_device passthrough..
432 */
433 if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
434 tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
435 tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
436 if (tmr_nacl && tmr_tpg) {
437 pr_debug("LUN_RESET: TMR caller fabric: %s"
438 " initiator port %s\n",
439 tmr_tpg->se_tpg_tfo->get_fabric_name(),
440 tmr_nacl->initiatorname);
441 }
442 }
443 pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
444 (preempt_and_abort_list) ? "Preempt" : "TMR",
445 dev->transport->name, tas);
446
447 core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
448 core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
449 preempt_and_abort_list);
450 core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas,
451 preempt_and_abort_list);
452 /*
453 * Clear any legacy SPC-2 reservation when called during
454 * LOGICAL UNIT RESET
455 */
456 if (!preempt_and_abort_list &&
457 (dev->dev_flags & DF_SPC2_RESERVATIONS)) {
458 spin_lock(&dev->dev_reservation_lock);
459 dev->dev_reserved_node_acl = NULL;
460 dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
461 spin_unlock(&dev->dev_reservation_lock);
462 pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
463 }
464
465 spin_lock_irq(&dev->stats_lock);
466 dev->num_resets++;
467 spin_unlock_irq(&dev->stats_lock);
468
469 pr_debug("LUN_RESET: %s for [%s] Complete\n",
470 (preempt_and_abort_list) ? "Preempt" : "TMR",
471 dev->transport->name);
472 return 0;
473}
474