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26#include <linux/slab.h>
27#include <linux/spinlock.h>
28#include <linux/list.h>
29#include <linux/export.h>
30
31#include <target/target_core_base.h>
32#include <target/target_core_backend.h>
33#include <target/target_core_fabric.h>
34
35#include "target_core_internal.h"
36#include "target_core_alua.h"
37#include "target_core_pr.h"
38
39int core_tmr_alloc_req(
40 struct se_cmd *se_cmd,
41 void *fabric_tmr_ptr,
42 u8 function,
43 gfp_t gfp_flags)
44{
45 struct se_tmr_req *tmr;
46
47 tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
48 if (!tmr) {
49 pr_err("Unable to allocate struct se_tmr_req\n");
50 return -ENOMEM;
51 }
52
53 se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
54 se_cmd->se_tmr_req = tmr;
55 tmr->task_cmd = se_cmd;
56 tmr->fabric_tmr_ptr = fabric_tmr_ptr;
57 tmr->function = function;
58 INIT_LIST_HEAD(&tmr->tmr_list);
59
60 return 0;
61}
62EXPORT_SYMBOL(core_tmr_alloc_req);
63
64void core_tmr_release_req(struct se_tmr_req *tmr)
65{
66 struct se_device *dev = tmr->tmr_dev;
67 unsigned long flags;
68
69 if (dev) {
70 spin_lock_irqsave(&dev->se_tmr_lock, flags);
71 list_del_init(&tmr->tmr_list);
72 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
73 }
74
75 kfree(tmr);
76}
77
78static void core_tmr_handle_tas_abort(struct se_cmd *cmd, int tas)
79{
80 unsigned long flags;
81 bool remove = true, send_tas;
82
83
84
85 spin_lock_irqsave(&cmd->t_state_lock, flags);
86 send_tas = (cmd->transport_state & CMD_T_TAS);
87 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
88
89 if (send_tas) {
90 remove = false;
91 transport_send_task_abort(cmd);
92 }
93
94 transport_cmd_finish_abort(cmd, remove);
95}
96
97static int target_check_cdb_and_preempt(struct list_head *list,
98 struct se_cmd *cmd)
99{
100 struct t10_pr_registration *reg;
101
102 if (!list)
103 return 0;
104 list_for_each_entry(reg, list, pr_reg_abort_list) {
105 if (reg->pr_res_key == cmd->pr_res_key)
106 return 0;
107 }
108
109 return 1;
110}
111
112static bool __target_check_io_state(struct se_cmd *se_cmd,
113 struct se_session *tmr_sess, int tas)
114{
115 struct se_session *sess = se_cmd->se_sess;
116
117 assert_spin_locked(&sess->sess_cmd_lock);
118 WARN_ON_ONCE(!irqs_disabled());
119
120
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126
127
128
129 spin_lock(&se_cmd->t_state_lock);
130 if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) {
131 pr_debug("Attempted to abort io tag: %llu already complete or"
132 " fabric stop, skipping\n", se_cmd->tag);
133 spin_unlock(&se_cmd->t_state_lock);
134 return false;
135 }
136 if (sess->sess_tearing_down || se_cmd->cmd_wait_set) {
137 pr_debug("Attempted to abort io tag: %llu already shutdown,"
138 " skipping\n", se_cmd->tag);
139 spin_unlock(&se_cmd->t_state_lock);
140 return false;
141 }
142 se_cmd->transport_state |= CMD_T_ABORTED;
143
144 if ((tmr_sess != se_cmd->se_sess) && tas)
145 se_cmd->transport_state |= CMD_T_TAS;
146
147 spin_unlock(&se_cmd->t_state_lock);
148
149 return kref_get_unless_zero(&se_cmd->cmd_kref);
150}
151
152void core_tmr_abort_task(
153 struct se_device *dev,
154 struct se_tmr_req *tmr,
155 struct se_session *se_sess)
156{
157 struct se_cmd *se_cmd;
158 unsigned long flags;
159 u64 ref_tag;
160
161 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
162 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
163
164 if (dev != se_cmd->se_dev)
165 continue;
166
167
168 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
169 continue;
170
171 ref_tag = se_cmd->tag;
172 if (tmr->ref_task_tag != ref_tag)
173 continue;
174
175 printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
176 se_cmd->se_tfo->get_fabric_name(), ref_tag);
177
178 if (!__target_check_io_state(se_cmd, se_sess, 0)) {
179 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
180 goto out;
181 }
182 list_del_init(&se_cmd->se_cmd_list);
183 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
184
185 cancel_work_sync(&se_cmd->work);
186 transport_wait_for_tasks(se_cmd);
187
188 transport_cmd_finish_abort(se_cmd, true);
189 target_put_sess_cmd(se_cmd);
190
191 printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
192 " ref_tag: %llu\n", ref_tag);
193 tmr->response = TMR_FUNCTION_COMPLETE;
194 return;
195 }
196 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
197
198out:
199 printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
200 tmr->ref_task_tag);
201 tmr->response = TMR_TASK_DOES_NOT_EXIST;
202}
203
204static void core_tmr_drain_tmr_list(
205 struct se_device *dev,
206 struct se_tmr_req *tmr,
207 struct list_head *preempt_and_abort_list)
208{
209 LIST_HEAD(drain_tmr_list);
210 struct se_session *sess;
211 struct se_tmr_req *tmr_p, *tmr_pp;
212 struct se_cmd *cmd;
213 unsigned long flags;
214 bool rc;
215
216
217
218
219 spin_lock_irqsave(&dev->se_tmr_lock, flags);
220 list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
221
222
223
224 if (tmr_p == tmr)
225 continue;
226
227 cmd = tmr_p->task_cmd;
228 if (!cmd) {
229 pr_err("Unable to locate struct se_cmd for TMR\n");
230 continue;
231 }
232
233
234
235
236
237 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
238 continue;
239
240 sess = cmd->se_sess;
241 if (WARN_ON_ONCE(!sess))
242 continue;
243
244 spin_lock(&sess->sess_cmd_lock);
245 spin_lock(&cmd->t_state_lock);
246 if (!(cmd->transport_state & CMD_T_ACTIVE) ||
247 (cmd->transport_state & CMD_T_FABRIC_STOP)) {
248 spin_unlock(&cmd->t_state_lock);
249 spin_unlock(&sess->sess_cmd_lock);
250 continue;
251 }
252 if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
253 spin_unlock(&cmd->t_state_lock);
254 spin_unlock(&sess->sess_cmd_lock);
255 continue;
256 }
257 if (sess->sess_tearing_down || cmd->cmd_wait_set) {
258 spin_unlock(&cmd->t_state_lock);
259 spin_unlock(&sess->sess_cmd_lock);
260 continue;
261 }
262 cmd->transport_state |= CMD_T_ABORTED;
263 spin_unlock(&cmd->t_state_lock);
264
265 rc = kref_get_unless_zero(&cmd->cmd_kref);
266 if (!rc) {
267 printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n");
268 spin_unlock(&sess->sess_cmd_lock);
269 continue;
270 }
271 spin_unlock(&sess->sess_cmd_lock);
272
273 list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
274 }
275 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
276
277 list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
278 list_del_init(&tmr_p->tmr_list);
279 cmd = tmr_p->task_cmd;
280
281 pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
282 " Response: 0x%02x, t_state: %d\n",
283 (preempt_and_abort_list) ? "Preempt" : "", tmr_p,
284 tmr_p->function, tmr_p->response, cmd->t_state);
285
286 cancel_work_sync(&cmd->work);
287 transport_wait_for_tasks(cmd);
288
289 transport_cmd_finish_abort(cmd, 1);
290 target_put_sess_cmd(cmd);
291 }
292}
293
294static void core_tmr_drain_state_list(
295 struct se_device *dev,
296 struct se_cmd *prout_cmd,
297 struct se_session *tmr_sess,
298 int tas,
299 struct list_head *preempt_and_abort_list)
300{
301 LIST_HEAD(drain_task_list);
302 struct se_session *sess;
303 struct se_cmd *cmd, *next;
304 unsigned long flags;
305 int rc;
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329 spin_lock_irqsave(&dev->execute_task_lock, flags);
330 list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) {
331
332
333
334
335 if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
336 continue;
337
338
339
340
341 if (prout_cmd == cmd)
342 continue;
343
344 sess = cmd->se_sess;
345 if (WARN_ON_ONCE(!sess))
346 continue;
347
348 spin_lock(&sess->sess_cmd_lock);
349 rc = __target_check_io_state(cmd, tmr_sess, tas);
350 spin_unlock(&sess->sess_cmd_lock);
351 if (!rc)
352 continue;
353
354 list_move_tail(&cmd->state_list, &drain_task_list);
355 cmd->state_active = false;
356 }
357 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
358
359 while (!list_empty(&drain_task_list)) {
360 cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
361 list_del_init(&cmd->state_list);
362
363 pr_debug("LUN_RESET: %s cmd: %p"
364 " ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
365 "cdb: 0x%02x\n",
366 (preempt_and_abort_list) ? "Preempt" : "", cmd,
367 cmd->tag, 0,
368 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
369 cmd->t_task_cdb[0]);
370 pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
371 " -- CMD_T_ACTIVE: %d"
372 " CMD_T_STOP: %d CMD_T_SENT: %d\n",
373 cmd->tag, cmd->pr_res_key,
374 (cmd->transport_state & CMD_T_ACTIVE) != 0,
375 (cmd->transport_state & CMD_T_STOP) != 0,
376 (cmd->transport_state & CMD_T_SENT) != 0);
377
378
379
380
381
382
383
384
385 cancel_work_sync(&cmd->work);
386 transport_wait_for_tasks(cmd);
387
388 core_tmr_handle_tas_abort(cmd, tas);
389 target_put_sess_cmd(cmd);
390 }
391}
392
393int core_tmr_lun_reset(
394 struct se_device *dev,
395 struct se_tmr_req *tmr,
396 struct list_head *preempt_and_abort_list,
397 struct se_cmd *prout_cmd)
398{
399 struct se_node_acl *tmr_nacl = NULL;
400 struct se_portal_group *tmr_tpg = NULL;
401 struct se_session *tmr_sess = NULL;
402 int tas;
403
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414 tas = dev->dev_attrib.emulate_tas;
415
416
417
418
419 if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
420 tmr_sess = tmr->task_cmd->se_sess;
421 tmr_nacl = tmr_sess->se_node_acl;
422 tmr_tpg = tmr_sess->se_tpg;
423 if (tmr_nacl && tmr_tpg) {
424 pr_debug("LUN_RESET: TMR caller fabric: %s"
425 " initiator port %s\n",
426 tmr_tpg->se_tpg_tfo->get_fabric_name(),
427 tmr_nacl->initiatorname);
428 }
429 }
430 pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
431 (preempt_and_abort_list) ? "Preempt" : "TMR",
432 dev->transport->name, tas);
433
434 core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
435 core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas,
436 preempt_and_abort_list);
437
438
439
440
441
442 if (!preempt_and_abort_list &&
443 (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) {
444 spin_lock(&dev->dev_reservation_lock);
445 dev->dev_reserved_node_acl = NULL;
446 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
447 spin_unlock(&dev->dev_reservation_lock);
448 pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
449 }
450
451 atomic_long_inc(&dev->num_resets);
452
453 pr_debug("LUN_RESET: %s for [%s] Complete\n",
454 (preempt_and_abort_list) ? "Preempt" : "TMR",
455 dev->transport->name);
456 return 0;
457}
458
459