Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_tmr.c | |
3 | * | |
4 | * This file contains SPC-3 task management infrastructure | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2009-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
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. | |
14 | * | |
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. | |
19 | * | |
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. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/slab.h> |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/list.h> | |
c53181af | 29 | #include <linux/export.h> |
c66ac9db NB |
30 | |
31 | #include <target/target_core_base.h> | |
c4795fb2 CH |
32 | #include <target/target_core_backend.h> |
33 | #include <target/target_core_fabric.h> | |
c66ac9db | 34 | |
e26d99ae | 35 | #include "target_core_internal.h" |
c66ac9db NB |
36 | #include "target_core_alua.h" |
37 | #include "target_core_pr.h" | |
38 | ||
c8e31f26 | 39 | int core_tmr_alloc_req( |
c66ac9db NB |
40 | struct se_cmd *se_cmd, |
41 | void *fabric_tmr_ptr, | |
dd503a5f RD |
42 | u8 function, |
43 | gfp_t gfp_flags) | |
c66ac9db NB |
44 | { |
45 | struct se_tmr_req *tmr; | |
46 | ||
c8e31f26 | 47 | tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); |
6708bb27 AG |
48 | if (!tmr) { |
49 | pr_err("Unable to allocate struct se_tmr_req\n"); | |
c8e31f26 | 50 | return -ENOMEM; |
c66ac9db | 51 | } |
c8e31f26 AG |
52 | |
53 | se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; | |
54 | se_cmd->se_tmr_req = tmr; | |
c66ac9db NB |
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 | ||
c8e31f26 | 60 | return 0; |
c66ac9db NB |
61 | } |
62 | EXPORT_SYMBOL(core_tmr_alloc_req); | |
63 | ||
8f832690 | 64 | void core_tmr_release_req(struct se_tmr_req *tmr) |
c66ac9db NB |
65 | { |
66 | struct se_device *dev = tmr->tmr_dev; | |
d050ffb9 | 67 | unsigned long flags; |
c66ac9db | 68 | |
8f832690 JE |
69 | if (dev) { |
70 | spin_lock_irqsave(&dev->se_tmr_lock, flags); | |
a6d9bb1c | 71 | list_del_init(&tmr->tmr_list); |
8f832690 | 72 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
7fd29aa9 NB |
73 | } |
74 | ||
c8e31f26 | 75 | kfree(tmr); |
c66ac9db NB |
76 | } |
77 | ||
78 | static void core_tmr_handle_tas_abort( | |
79 | struct se_node_acl *tmr_nacl, | |
80 | struct se_cmd *cmd, | |
c1c35d52 | 81 | int tas) |
c66ac9db | 82 | { |
68259b5a | 83 | bool remove = true; |
c66ac9db NB |
84 | /* |
85 | * TASK ABORTED status (TAS) bit support | |
8f832690 JE |
86 | */ |
87 | if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) { | |
68259b5a | 88 | remove = false; |
c66ac9db | 89 | transport_send_task_abort(cmd); |
68259b5a | 90 | } |
c66ac9db | 91 | |
68259b5a | 92 | transport_cmd_finish_abort(cmd, remove); |
c66ac9db NB |
93 | } |
94 | ||
feae8564 JE |
95 | static int target_check_cdb_and_preempt(struct list_head *list, |
96 | struct se_cmd *cmd) | |
c165f69c | 97 | { |
feae8564 | 98 | struct t10_pr_registration *reg; |
c165f69c | 99 | |
feae8564 JE |
100 | if (!list) |
101 | return 0; | |
102 | list_for_each_entry(reg, list, pr_reg_abort_list) { | |
103 | if (reg->pr_res_key == cmd->pr_res_key) | |
c165f69c JE |
104 | return 0; |
105 | } | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
febe562c NB |
110 | static bool __target_check_io_state(struct se_cmd *se_cmd) |
111 | { | |
112 | struct se_session *sess = se_cmd->se_sess; | |
113 | ||
114 | assert_spin_locked(&sess->sess_cmd_lock); | |
115 | WARN_ON_ONCE(!irqs_disabled()); | |
116 | /* | |
117 | * If command already reached CMD_T_COMPLETE state within | |
118 | * target_complete_cmd(), this se_cmd has been passed to | |
119 | * fabric driver and will not be aborted. | |
120 | * | |
121 | * Otherwise, obtain a local se_cmd->cmd_kref now for TMR | |
122 | * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as | |
123 | * long as se_cmd->cmd_kref is still active unless zero. | |
124 | */ | |
125 | spin_lock(&se_cmd->t_state_lock); | |
126 | if (se_cmd->transport_state & CMD_T_COMPLETE) { | |
127 | pr_debug("Attempted to abort io tag: %llu already complete," | |
128 | " skipping\n", se_cmd->tag); | |
129 | spin_unlock(&se_cmd->t_state_lock); | |
130 | return false; | |
131 | } | |
132 | se_cmd->transport_state |= CMD_T_ABORTED; | |
133 | spin_unlock(&se_cmd->t_state_lock); | |
134 | ||
135 | return kref_get_unless_zero(&se_cmd->cmd_kref); | |
136 | } | |
137 | ||
3d28934a NB |
138 | void core_tmr_abort_task( |
139 | struct se_device *dev, | |
140 | struct se_tmr_req *tmr, | |
141 | struct se_session *se_sess) | |
142 | { | |
f81ccb48 | 143 | struct se_cmd *se_cmd; |
3d28934a | 144 | unsigned long flags; |
649ee054 | 145 | u64 ref_tag; |
3d28934a NB |
146 | |
147 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
f81ccb48 | 148 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { |
3d28934a NB |
149 | |
150 | if (dev != se_cmd->se_dev) | |
151 | continue; | |
47b1584c | 152 | |
dc0fafda BVA |
153 | /* skip task management functions, including tmr->task_cmd */ |
154 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
47b1584c AL |
155 | continue; |
156 | ||
649ee054 | 157 | ref_tag = se_cmd->tag; |
3d28934a NB |
158 | if (tmr->ref_task_tag != ref_tag) |
159 | continue; | |
160 | ||
649ee054 | 161 | printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", |
3d28934a NB |
162 | se_cmd->se_tfo->get_fabric_name(), ref_tag); |
163 | ||
febe562c | 164 | if (!__target_check_io_state(se_cmd)) { |
3d28934a | 165 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
9ff9d15e | 166 | target_put_sess_cmd(se_cmd); |
3d28934a NB |
167 | goto out; |
168 | } | |
3d28934a | 169 | list_del_init(&se_cmd->se_cmd_list); |
3d28934a NB |
170 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
171 | ||
172 | cancel_work_sync(&se_cmd->work); | |
173 | transport_wait_for_tasks(se_cmd); | |
3d28934a | 174 | |
68259b5a | 175 | transport_cmd_finish_abort(se_cmd, true); |
febe562c | 176 | target_put_sess_cmd(se_cmd); |
3d28934a NB |
177 | |
178 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" | |
649ee054 | 179 | " ref_tag: %llu\n", ref_tag); |
3d28934a NB |
180 | tmr->response = TMR_FUNCTION_COMPLETE; |
181 | return; | |
182 | } | |
183 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
184 | ||
185 | out: | |
649ee054 | 186 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", |
3d28934a NB |
187 | tmr->ref_task_tag); |
188 | tmr->response = TMR_TASK_DOES_NOT_EXIST; | |
189 | } | |
190 | ||
d050ffb9 | 191 | static void core_tmr_drain_tmr_list( |
c66ac9db NB |
192 | struct se_device *dev, |
193 | struct se_tmr_req *tmr, | |
d050ffb9 | 194 | struct list_head *preempt_and_abort_list) |
c66ac9db | 195 | { |
d050ffb9 | 196 | LIST_HEAD(drain_tmr_list); |
a6d9bb1c | 197 | struct se_session *sess; |
c66ac9db | 198 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 199 | struct se_cmd *cmd; |
c66ac9db | 200 | unsigned long flags; |
a6d9bb1c | 201 | bool rc; |
c66ac9db NB |
202 | /* |
203 | * Release all pending and outgoing TMRs aside from the received | |
204 | * LUN_RESET tmr.. | |
205 | */ | |
d050ffb9 | 206 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db NB |
207 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
208 | /* | |
209 | * Allow the received TMR to return with FUNCTION_COMPLETE. | |
210 | */ | |
abc1fd4f | 211 | if (tmr_p == tmr) |
c66ac9db NB |
212 | continue; |
213 | ||
214 | cmd = tmr_p->task_cmd; | |
6708bb27 AG |
215 | if (!cmd) { |
216 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
217 | continue; |
218 | } | |
219 | /* | |
220 | * If this function was called with a valid pr_res_key | |
221 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
ac75d8be | 222 | * skip non registration key matching TMRs. |
c66ac9db | 223 | */ |
feae8564 | 224 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 225 | continue; |
c66ac9db | 226 | |
a6d9bb1c NB |
227 | sess = cmd->se_sess; |
228 | if (WARN_ON_ONCE(!sess)) | |
229 | continue; | |
230 | ||
231 | spin_lock(&sess->sess_cmd_lock); | |
d050ffb9 | 232 | spin_lock(&cmd->t_state_lock); |
7d680f3b | 233 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d050ffb9 | 234 | spin_unlock(&cmd->t_state_lock); |
a6d9bb1c | 235 | spin_unlock(&sess->sess_cmd_lock); |
c66ac9db NB |
236 | continue; |
237 | } | |
238 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
d050ffb9 | 239 | spin_unlock(&cmd->t_state_lock); |
a6d9bb1c | 240 | spin_unlock(&sess->sess_cmd_lock); |
c66ac9db NB |
241 | continue; |
242 | } | |
a6d9bb1c | 243 | cmd->transport_state |= CMD_T_ABORTED; |
d050ffb9 NB |
244 | spin_unlock(&cmd->t_state_lock); |
245 | ||
a6d9bb1c NB |
246 | rc = kref_get_unless_zero(&cmd->cmd_kref); |
247 | spin_unlock(&sess->sess_cmd_lock); | |
248 | if (!rc) { | |
249 | printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); | |
250 | continue; | |
251 | } | |
6eb40b2a | 252 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
d050ffb9 NB |
253 | } |
254 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
255 | ||
abc1fd4f | 256 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
b8a11d73 | 257 | list_del_init(&tmr_p->tmr_list); |
abc1fd4f | 258 | cmd = tmr_p->task_cmd; |
d050ffb9 | 259 | |
6708bb27 | 260 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
c66ac9db | 261 | " Response: 0x%02x, t_state: %d\n", |
abc1fd4f JE |
262 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
263 | tmr_p->function, tmr_p->response, cmd->t_state); | |
c66ac9db | 264 | |
a6d9bb1c NB |
265 | cancel_work_sync(&cmd->work); |
266 | transport_wait_for_tasks(cmd); | |
267 | ||
8dc52b54 | 268 | transport_cmd_finish_abort(cmd, 1); |
a6d9bb1c | 269 | target_put_sess_cmd(cmd); |
c66ac9db | 270 | } |
d050ffb9 NB |
271 | } |
272 | ||
cf572a96 | 273 | static void core_tmr_drain_state_list( |
d050ffb9 NB |
274 | struct se_device *dev, |
275 | struct se_cmd *prout_cmd, | |
276 | struct se_node_acl *tmr_nacl, | |
277 | int tas, | |
278 | struct list_head *preempt_and_abort_list) | |
279 | { | |
280 | LIST_HEAD(drain_task_list); | |
febe562c | 281 | struct se_session *sess; |
cf572a96 | 282 | struct se_cmd *cmd, *next; |
d050ffb9 | 283 | unsigned long flags; |
febe562c | 284 | int rc; |
cf572a96 | 285 | |
c66ac9db | 286 | /* |
cf572a96 CH |
287 | * Complete outstanding commands with TASK_ABORTED SAM status. |
288 | * | |
c66ac9db NB |
289 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
290 | * for TMR LUN_RESET: | |
291 | * | |
292 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
293 | * other than the one that caused the SCSI device condition is | |
294 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
295 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
296 | * returned for aborted commands. | |
297 | * | |
298 | * d) If the logical unit reset is caused by a particular I_T nexus | |
299 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
300 | * (TASK_ABORTED status) applies. | |
301 | * | |
302 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
303 | * (no TASK_ABORTED SAM status) applies. | |
304 | * | |
305 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
306 | * in the Control Mode Page. | |
307 | */ | |
308 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 309 | list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { |
c66ac9db NB |
310 | /* |
311 | * For PREEMPT_AND_ABORT usage, only process commands | |
312 | * with a matching reservation key. | |
313 | */ | |
feae8564 | 314 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 315 | continue; |
cf572a96 | 316 | |
c66ac9db NB |
317 | /* |
318 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
319 | */ | |
320 | if (prout_cmd == cmd) | |
321 | continue; | |
322 | ||
febe562c NB |
323 | sess = cmd->se_sess; |
324 | if (WARN_ON_ONCE(!sess)) | |
325 | continue; | |
326 | ||
327 | spin_lock(&sess->sess_cmd_lock); | |
328 | rc = __target_check_io_state(cmd); | |
329 | spin_unlock(&sess->sess_cmd_lock); | |
330 | if (!rc) | |
331 | continue; | |
332 | ||
cf572a96 CH |
333 | list_move_tail(&cmd->state_list, &drain_task_list); |
334 | cmd->state_active = false; | |
d050ffb9 NB |
335 | } |
336 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
337 | ||
338 | while (!list_empty(&drain_task_list)) { | |
cf572a96 | 339 | cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); |
febe562c | 340 | list_del_init(&cmd->state_list); |
c66ac9db | 341 | |
cf572a96 | 342 | pr_debug("LUN_RESET: %s cmd: %p" |
649ee054 | 343 | " ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d" |
f2da9dbd | 344 | "cdb: 0x%02x\n", |
cf572a96 | 345 | (preempt_and_abort_list) ? "Preempt" : "", cmd, |
649ee054 | 346 | cmd->tag, 0, |
e3d6f909 | 347 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, |
f2da9dbd | 348 | cmd->t_task_cdb[0]); |
649ee054 | 349 | pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx" |
785fdf70 | 350 | " -- CMD_T_ACTIVE: %d" |
7d680f3b | 351 | " CMD_T_STOP: %d CMD_T_SENT: %d\n", |
649ee054 | 352 | cmd->tag, cmd->pr_res_key, |
7d680f3b CH |
353 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
354 | (cmd->transport_state & CMD_T_STOP) != 0, | |
355 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 356 | |
35e0e757 CH |
357 | /* |
358 | * If the command may be queued onto a workqueue cancel it now. | |
359 | * | |
360 | * This is equivalent to removal from the execute queue in the | |
361 | * loop above, but we do it down here given that | |
362 | * cancel_work_sync may block. | |
363 | */ | |
febe562c NB |
364 | cancel_work_sync(&cmd->work); |
365 | transport_wait_for_tasks(cmd); | |
c66ac9db | 366 | |
c1c35d52 | 367 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas); |
febe562c | 368 | target_put_sess_cmd(cmd); |
c66ac9db | 369 | } |
d050ffb9 NB |
370 | } |
371 | ||
d050ffb9 NB |
372 | int core_tmr_lun_reset( |
373 | struct se_device *dev, | |
374 | struct se_tmr_req *tmr, | |
375 | struct list_head *preempt_and_abort_list, | |
376 | struct se_cmd *prout_cmd) | |
377 | { | |
378 | struct se_node_acl *tmr_nacl = NULL; | |
379 | struct se_portal_group *tmr_tpg = NULL; | |
380 | int tas; | |
381 | /* | |
382 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
383 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
384 | * | |
385 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
386 | * tasks shall be terminated by the device server without any response | |
387 | * to the application client. A TAS bit set to one specifies that tasks | |
388 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
389 | * which the command was received shall be completed with TASK ABORTED | |
390 | * status (see SAM-4). | |
391 | */ | |
0fd97ccf | 392 | tas = dev->dev_attrib.emulate_tas; |
d050ffb9 NB |
393 | /* |
394 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
395 | * or struct se_device passthrough.. | |
396 | */ | |
397 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
398 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; | |
399 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; | |
400 | if (tmr_nacl && tmr_tpg) { | |
401 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
402 | " initiator port %s\n", | |
403 | tmr_tpg->se_tpg_tfo->get_fabric_name(), | |
404 | tmr_nacl->initiatorname); | |
405 | } | |
406 | } | |
407 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
408 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
409 | dev->transport->name, tas); | |
410 | ||
411 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
cf572a96 | 412 | core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas, |
d050ffb9 | 413 | preempt_and_abort_list); |
af877292 | 414 | |
c66ac9db NB |
415 | /* |
416 | * Clear any legacy SPC-2 reservation when called during | |
417 | * LOGICAL UNIT RESET | |
418 | */ | |
6708bb27 | 419 | if (!preempt_and_abort_list && |
0fd97ccf | 420 | (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { |
c66ac9db NB |
421 | spin_lock(&dev->dev_reservation_lock); |
422 | dev->dev_reserved_node_acl = NULL; | |
0fd97ccf | 423 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
c66ac9db | 424 | spin_unlock(&dev->dev_reservation_lock); |
6708bb27 | 425 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
426 | } |
427 | ||
ee480683 | 428 | atomic_long_inc(&dev->num_resets); |
c66ac9db | 429 | |
6708bb27 | 430 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 431 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 432 | dev->transport->name); |
c66ac9db NB |
433 | return 0; |
434 | } | |
d050ffb9 | 435 |