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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/version.h>
28#include <linux/slab.h>
29#include <linux/spinlock.h>
30#include <linux/list.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_device.h>
36#include <target/target_core_tmr.h>
37#include <target/target_core_transport.h>
38#include <target/target_core_fabric_ops.h>
39#include <target/target_core_configfs.h>
40
41#include "target_core_alua.h"
42#include "target_core_pr.h"
43
44struct se_tmr_req *core_tmr_alloc_req(
45 struct se_cmd *se_cmd,
46 void *fabric_tmr_ptr,
47 u8 function)
48{
49 struct se_tmr_req *tmr;
50
51 tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
52 GFP_ATOMIC : GFP_KERNEL);
53 if (!tmr) {
54 pr_err("Unable to allocate struct se_tmr_req\n");
55 return ERR_PTR(-ENOMEM);
56 }
57 tmr->task_cmd = se_cmd;
58 tmr->fabric_tmr_ptr = fabric_tmr_ptr;
59 tmr->function = function;
60 INIT_LIST_HEAD(&tmr->tmr_list);
61
62 return tmr;
63}
64EXPORT_SYMBOL(core_tmr_alloc_req);
65
66void core_tmr_release_req(
67 struct se_tmr_req *tmr)
68{
69 struct se_device *dev = tmr->tmr_dev;
70
71 if (!dev) {
72 kmem_cache_free(se_tmr_req_cache, tmr);
73 return;
74 }
75
76 spin_lock_irq(&dev->se_tmr_lock);
77 list_del(&tmr->tmr_list);
78 spin_unlock_irq(&dev->se_tmr_lock);
79
80 kmem_cache_free(se_tmr_req_cache, tmr);
81}
82
83static void core_tmr_handle_tas_abort(
84 struct se_node_acl *tmr_nacl,
85 struct se_cmd *cmd,
86 int tas,
87 int fe_count)
88{
89 if (!fe_count) {
90 transport_cmd_finish_abort(cmd, 1);
91 return;
92 }
93 /*
94 * TASK ABORTED status (TAS) bit support
95 */
96 if ((tmr_nacl &&
97 (tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
98 transport_send_task_abort(cmd);
99
100 transport_cmd_finish_abort(cmd, 0);
101}
102
103int core_tmr_lun_reset(
104 struct se_device *dev,
105 struct se_tmr_req *tmr,
106 struct list_head *preempt_and_abort_list,
107 struct se_cmd *prout_cmd)
108{
109 struct se_cmd *cmd, *tcmd;
110 struct se_node_acl *tmr_nacl = NULL;
111 struct se_portal_group *tmr_tpg = NULL;
112 struct se_queue_obj *qobj = &dev->dev_queue_obj;
113 struct se_tmr_req *tmr_p, *tmr_pp;
114 struct se_task *task, *task_tmp;
115 unsigned long flags;
116 int fe_count, tas;
117 /*
118 * TASK_ABORTED status bit, this is configurable via ConfigFS
119 * struct se_device attributes. spc4r17 section 7.4.6 Control mode page
120 *
121 * A task aborted status (TAS) bit set to zero specifies that aborted
122 * tasks shall be terminated by the device server without any response
123 * to the application client. A TAS bit set to one specifies that tasks
124 * aborted by the actions of an I_T nexus other than the I_T nexus on
125 * which the command was received shall be completed with TASK ABORTED
126 * status (see SAM-4).
127 */
128 tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
129 /*
130 * Determine if this se_tmr is coming from a $FABRIC_MOD
131 * or struct se_device passthrough..
132 */
133 if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
134 tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
135 tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
136 if (tmr_nacl && tmr_tpg) {
137 pr_debug("LUN_RESET: TMR caller fabric: %s"
138 " initiator port %s\n",
139 tmr_tpg->se_tpg_tfo->get_fabric_name(),
140 tmr_nacl->initiatorname);
141 }
142 }
143 pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
144 (preempt_and_abort_list) ? "Preempt" : "TMR",
145 dev->transport->name, tas);
146 /*
147 * Release all pending and outgoing TMRs aside from the received
148 * LUN_RESET tmr..
149 */
150 spin_lock_irq(&dev->se_tmr_lock);
151 list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
152 /*
153 * Allow the received TMR to return with FUNCTION_COMPLETE.
154 */
155 if (tmr && (tmr_p == tmr))
156 continue;
157
158 cmd = tmr_p->task_cmd;
159 if (!cmd) {
160 pr_err("Unable to locate struct se_cmd for TMR\n");
161 continue;
162 }
163 /*
164 * If this function was called with a valid pr_res_key
165 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
166 * skip non regisration key matching TMRs.
167 */
168 if (preempt_and_abort_list &&
169 (core_scsi3_check_cdb_abort_and_preempt(
170 preempt_and_abort_list, cmd) != 0))
171 continue;
172 spin_unlock_irq(&dev->se_tmr_lock);
173
174 spin_lock_irqsave(&cmd->t_state_lock, flags);
175 if (!atomic_read(&cmd->t_transport_active)) {
176 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
177 spin_lock_irq(&dev->se_tmr_lock);
178 continue;
179 }
180 if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
181 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
182 spin_lock_irq(&dev->se_tmr_lock);
183 continue;
184 }
185 pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
186 " Response: 0x%02x, t_state: %d\n",
187 (preempt_and_abort_list) ? "Preempt" : "", tmr_p,
188 tmr_p->function, tmr_p->response, cmd->t_state);
189 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
190
191 transport_cmd_finish_abort_tmr(cmd);
192 spin_lock_irq(&dev->se_tmr_lock);
193 }
194 spin_unlock_irq(&dev->se_tmr_lock);
195 /*
196 * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
197 * This is following sam4r17, section 5.6 Aborting commands, Table 38
198 * for TMR LUN_RESET:
199 *
200 * a) "Yes" indicates that each command that is aborted on an I_T nexus
201 * other than the one that caused the SCSI device condition is
202 * completed with TASK ABORTED status, if the TAS bit is set to one in
203 * the Control mode page (see SPC-4). "No" indicates that no status is
204 * returned for aborted commands.
205 *
206 * d) If the logical unit reset is caused by a particular I_T nexus
207 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
208 * (TASK_ABORTED status) applies.
209 *
210 * Otherwise (e.g., if triggered by a hard reset), "no"
211 * (no TASK_ABORTED SAM status) applies.
212 *
213 * Note that this seems to be independent of TAS (Task Aborted Status)
214 * in the Control Mode Page.
215 */
216 spin_lock_irqsave(&dev->execute_task_lock, flags);
217 list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
218 t_state_list) {
219 if (!task->task_se_cmd) {
220 pr_err("task->task_se_cmd is NULL!\n");
221 continue;
222 }
223 cmd = task->task_se_cmd;
224
225 /*
226 * For PREEMPT_AND_ABORT usage, only process commands
227 * with a matching reservation key.
228 */
229 if (preempt_and_abort_list &&
230 (core_scsi3_check_cdb_abort_and_preempt(
231 preempt_and_abort_list, cmd) != 0))
232 continue;
233 /*
234 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
235 */
236 if (prout_cmd == cmd)
237 continue;
238
239 list_del(&task->t_state_list);
240 atomic_set(&task->task_state_active, 0);
241 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
242
243 spin_lock_irqsave(&cmd->t_state_lock, flags);
244 pr_debug("LUN_RESET: %s cmd: %p task: %p"
245 " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
246 "def_t_state: %d/%d cdb: 0x%02x\n",
247 (preempt_and_abort_list) ? "Preempt" : "", cmd, task,
248 cmd->se_tfo->get_task_tag(cmd), 0,
249 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
250 cmd->deferred_t_state, cmd->t_task_cdb[0]);
251 pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
252 " t_task_cdbs: %d t_task_cdbs_left: %d"
253 " t_task_cdbs_sent: %d -- t_transport_active: %d"
254 " t_transport_stop: %d t_transport_sent: %d\n",
255 cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
256 cmd->t_task_list_num,
257 atomic_read(&cmd->t_task_cdbs_left),
258 atomic_read(&cmd->t_task_cdbs_sent),
259 atomic_read(&cmd->t_transport_active),
260 atomic_read(&cmd->t_transport_stop),
261 atomic_read(&cmd->t_transport_sent));
262
263 if (atomic_read(&task->task_active)) {
264 atomic_set(&task->task_stop, 1);
265 spin_unlock_irqrestore(
266 &cmd->t_state_lock, flags);
267
268 pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
269 " for dev: %p\n", task, dev);
270 wait_for_completion(&task->task_stop_comp);
271 pr_debug("LUN_RESET Completed task: %p shutdown for"
272 " dev: %p\n", task, dev);
273 spin_lock_irqsave(&cmd->t_state_lock, flags);
274 atomic_dec(&cmd->t_task_cdbs_left);
275
276 atomic_set(&task->task_active, 0);
277 atomic_set(&task->task_stop, 0);
278 } else {
279 if (atomic_read(&task->task_execute_queue) != 0)
280 transport_remove_task_from_execute_queue(task, dev);
281 }
282 __transport_stop_task_timer(task, &flags);
283
284 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
285 spin_unlock_irqrestore(
286 &cmd->t_state_lock, flags);
287 pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
288 " t_task_cdbs_ex_left: %d\n", task, dev,
289 atomic_read(&cmd->t_task_cdbs_ex_left));
290
291 spin_lock_irqsave(&dev->execute_task_lock, flags);
292 continue;
293 }
294 fe_count = atomic_read(&cmd->t_fe_count);
295
296 if (atomic_read(&cmd->t_transport_active)) {
297 pr_debug("LUN_RESET: got t_transport_active = 1 for"
298 " task: %p, t_fe_count: %d dev: %p\n", task,
299 fe_count, dev);
300 atomic_set(&cmd->t_transport_aborted, 1);
301 spin_unlock_irqrestore(&cmd->t_state_lock,
302 flags);
303 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
304
305 spin_lock_irqsave(&dev->execute_task_lock, flags);
306 continue;
307 }
308 pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
309 " t_fe_count: %d dev: %p\n", task, fe_count, dev);
310 atomic_set(&cmd->t_transport_aborted, 1);
311 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
312 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
313
314 spin_lock_irqsave(&dev->execute_task_lock, flags);
315 }
316 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
317 /*
318 * Release all commands remaining in the struct se_device cmd queue.
319 *
320 * This follows the same logic as above for the struct se_device
321 * struct se_task state list, where commands are returned with
322 * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
323 * reference, otherwise the struct se_cmd is released.
324 */
325 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
326 list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
327 /*
328 * For PREEMPT_AND_ABORT usage, only process commands
329 * with a matching reservation key.
330 */
331 if (preempt_and_abort_list &&
332 (core_scsi3_check_cdb_abort_and_preempt(
333 preempt_and_abort_list, cmd) != 0))
334 continue;
335 /*
336 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
337 */
338 if (prout_cmd == cmd)
339 continue;
340
341 atomic_dec(&cmd->t_transport_queue_active);
342 atomic_dec(&qobj->queue_cnt);
343 list_del(&cmd->se_queue_node);
344 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
345
346 pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
347 " %d t_fe_count: %d\n", (preempt_and_abort_list) ?
348 "Preempt" : "", cmd, cmd->t_state,
349 atomic_read(&cmd->t_fe_count));
350 /*
351 * Signal that the command has failed via cmd->se_cmd_flags,
352 */
353 transport_new_cmd_failure(cmd);
354
355 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
356 atomic_read(&cmd->t_fe_count));
357 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
358 }
359 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
360 /*
361 * Clear any legacy SPC-2 reservation when called during
362 * LOGICAL UNIT RESET
363 */
364 if (!preempt_and_abort_list &&
365 (dev->dev_flags & DF_SPC2_RESERVATIONS)) {
366 spin_lock(&dev->dev_reservation_lock);
367 dev->dev_reserved_node_acl = NULL;
368 dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
369 spin_unlock(&dev->dev_reservation_lock);
370 pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
371 }
372
373 spin_lock_irq(&dev->stats_lock);
374 dev->num_resets++;
375 spin_unlock_irq(&dev->stats_lock);
376
377 pr_debug("LUN_RESET: %s for [%s] Complete\n",
378 (preempt_and_abort_list) ? "Preempt" : "TMR",
379 dev->transport->name);
380 return 0;
381}
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