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 | ||
feae8564 JE |
78 | static int target_check_cdb_and_preempt(struct list_head *list, |
79 | struct se_cmd *cmd) | |
c165f69c | 80 | { |
feae8564 | 81 | struct t10_pr_registration *reg; |
c165f69c | 82 | |
feae8564 JE |
83 | if (!list) |
84 | return 0; | |
85 | list_for_each_entry(reg, list, pr_reg_abort_list) { | |
86 | if (reg->pr_res_key == cmd->pr_res_key) | |
c165f69c JE |
87 | return 0; |
88 | } | |
89 | ||
90 | return 1; | |
91 | } | |
92 | ||
0f4a9431 NB |
93 | static bool __target_check_io_state(struct se_cmd *se_cmd, |
94 | struct se_session *tmr_sess, int tas) | |
febe562c NB |
95 | { |
96 | struct se_session *sess = se_cmd->se_sess; | |
97 | ||
98 | assert_spin_locked(&sess->sess_cmd_lock); | |
99 | WARN_ON_ONCE(!irqs_disabled()); | |
100 | /* | |
101 | * If command already reached CMD_T_COMPLETE state within | |
0f4a9431 NB |
102 | * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown, |
103 | * this se_cmd has been passed to fabric driver and will | |
104 | * not be aborted. | |
febe562c NB |
105 | * |
106 | * Otherwise, obtain a local se_cmd->cmd_kref now for TMR | |
107 | * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as | |
108 | * long as se_cmd->cmd_kref is still active unless zero. | |
109 | */ | |
110 | spin_lock(&se_cmd->t_state_lock); | |
0f4a9431 NB |
111 | if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) { |
112 | pr_debug("Attempted to abort io tag: %llu already complete or" | |
113 | " fabric stop, skipping\n", se_cmd->tag); | |
114 | spin_unlock(&se_cmd->t_state_lock); | |
115 | return false; | |
116 | } | |
1c21a480 NB |
117 | if (se_cmd->transport_state & CMD_T_PRE_EXECUTE) { |
118 | if (se_cmd->scsi_status) { | |
119 | pr_debug("Attempted to abort io tag: %llu early failure" | |
120 | " status: 0x%02x\n", se_cmd->tag, | |
121 | se_cmd->scsi_status); | |
122 | spin_unlock(&se_cmd->t_state_lock); | |
123 | return false; | |
124 | } | |
125 | } | |
00d909a1 | 126 | if (sess->sess_tearing_down) { |
0f4a9431 | 127 | pr_debug("Attempted to abort io tag: %llu already shutdown," |
febe562c NB |
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; | |
0f4a9431 NB |
133 | |
134 | if ((tmr_sess != se_cmd->se_sess) && tas) | |
135 | se_cmd->transport_state |= CMD_T_TAS; | |
136 | ||
febe562c NB |
137 | spin_unlock(&se_cmd->t_state_lock); |
138 | ||
139 | return kref_get_unless_zero(&se_cmd->cmd_kref); | |
140 | } | |
141 | ||
3d28934a NB |
142 | void core_tmr_abort_task( |
143 | struct se_device *dev, | |
144 | struct se_tmr_req *tmr, | |
145 | struct se_session *se_sess) | |
146 | { | |
f81ccb48 | 147 | struct se_cmd *se_cmd; |
3d28934a | 148 | unsigned long flags; |
649ee054 | 149 | u64 ref_tag; |
3d28934a NB |
150 | |
151 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
f81ccb48 | 152 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { |
3d28934a NB |
153 | |
154 | if (dev != se_cmd->se_dev) | |
155 | continue; | |
47b1584c | 156 | |
dc0fafda BVA |
157 | /* skip task management functions, including tmr->task_cmd */ |
158 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
47b1584c AL |
159 | continue; |
160 | ||
649ee054 | 161 | ref_tag = se_cmd->tag; |
3d28934a NB |
162 | if (tmr->ref_task_tag != ref_tag) |
163 | continue; | |
164 | ||
649ee054 | 165 | printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", |
30c7ca93 | 166 | se_cmd->se_tfo->fabric_name, ref_tag); |
3d28934a | 167 | |
aaa00cc9 BVA |
168 | if (!__target_check_io_state(se_cmd, se_sess, |
169 | dev->dev_attrib.emulate_tas)) | |
3a1e7ca6 BVA |
170 | continue; |
171 | ||
3d28934a NB |
172 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
173 | ||
2c9fa49e BVA |
174 | /* |
175 | * Ensure that this ABORT request is visible to the LU RESET | |
176 | * code. | |
177 | */ | |
178 | if (!tmr->tmr_dev) | |
179 | WARN_ON_ONCE(transport_lookup_tmr_lun(tmr->task_cmd, | |
180 | se_cmd->orig_fe_lun) < 0); | |
3d28934a | 181 | |
2c9fa49e | 182 | target_put_cmd_and_wait(se_cmd); |
3d28934a NB |
183 | |
184 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" | |
649ee054 | 185 | " ref_tag: %llu\n", ref_tag); |
3d28934a | 186 | tmr->response = TMR_FUNCTION_COMPLETE; |
c87ba9c4 | 187 | atomic_long_inc(&dev->aborts_complete); |
3d28934a NB |
188 | return; |
189 | } | |
190 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
191 | ||
649ee054 | 192 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", |
3d28934a NB |
193 | tmr->ref_task_tag); |
194 | tmr->response = TMR_TASK_DOES_NOT_EXIST; | |
c87ba9c4 | 195 | atomic_long_inc(&dev->aborts_no_task); |
3d28934a NB |
196 | } |
197 | ||
d050ffb9 | 198 | static void core_tmr_drain_tmr_list( |
c66ac9db NB |
199 | struct se_device *dev, |
200 | struct se_tmr_req *tmr, | |
d050ffb9 | 201 | struct list_head *preempt_and_abort_list) |
c66ac9db | 202 | { |
d050ffb9 | 203 | LIST_HEAD(drain_tmr_list); |
a6d9bb1c | 204 | struct se_session *sess; |
c66ac9db | 205 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 206 | struct se_cmd *cmd; |
c66ac9db | 207 | unsigned long flags; |
a6d9bb1c | 208 | bool rc; |
c66ac9db NB |
209 | /* |
210 | * Release all pending and outgoing TMRs aside from the received | |
211 | * LUN_RESET tmr.. | |
212 | */ | |
d050ffb9 | 213 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
88fb2fa7 | 214 | if (tmr) |
215 | list_del_init(&tmr->tmr_list); | |
c66ac9db | 216 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
c66ac9db | 217 | cmd = tmr_p->task_cmd; |
6708bb27 AG |
218 | if (!cmd) { |
219 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
220 | continue; |
221 | } | |
222 | /* | |
223 | * If this function was called with a valid pr_res_key | |
224 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
ac75d8be | 225 | * skip non registration key matching TMRs. |
c66ac9db | 226 | */ |
feae8564 | 227 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 228 | continue; |
c66ac9db | 229 | |
a6d9bb1c NB |
230 | sess = cmd->se_sess; |
231 | if (WARN_ON_ONCE(!sess)) | |
232 | continue; | |
233 | ||
234 | spin_lock(&sess->sess_cmd_lock); | |
d050ffb9 | 235 | spin_lock(&cmd->t_state_lock); |
0f4a9431 NB |
236 | if (!(cmd->transport_state & CMD_T_ACTIVE) || |
237 | (cmd->transport_state & CMD_T_FABRIC_STOP)) { | |
d050ffb9 | 238 | spin_unlock(&cmd->t_state_lock); |
a6d9bb1c | 239 | spin_unlock(&sess->sess_cmd_lock); |
c66ac9db NB |
240 | continue; |
241 | } | |
242 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
d050ffb9 | 243 | spin_unlock(&cmd->t_state_lock); |
a6d9bb1c | 244 | spin_unlock(&sess->sess_cmd_lock); |
c66ac9db NB |
245 | continue; |
246 | } | |
00d909a1 | 247 | if (sess->sess_tearing_down) { |
0f4a9431 NB |
248 | spin_unlock(&cmd->t_state_lock); |
249 | spin_unlock(&sess->sess_cmd_lock); | |
250 | continue; | |
251 | } | |
a6d9bb1c | 252 | cmd->transport_state |= CMD_T_ABORTED; |
d050ffb9 NB |
253 | spin_unlock(&cmd->t_state_lock); |
254 | ||
a6d9bb1c | 255 | rc = kref_get_unless_zero(&cmd->cmd_kref); |
a6d9bb1c NB |
256 | if (!rc) { |
257 | printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); | |
0f4a9431 | 258 | spin_unlock(&sess->sess_cmd_lock); |
a6d9bb1c NB |
259 | continue; |
260 | } | |
0f4a9431 NB |
261 | spin_unlock(&sess->sess_cmd_lock); |
262 | ||
6eb40b2a | 263 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
d050ffb9 NB |
264 | } |
265 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
266 | ||
abc1fd4f | 267 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
b8a11d73 | 268 | list_del_init(&tmr_p->tmr_list); |
abc1fd4f | 269 | cmd = tmr_p->task_cmd; |
d050ffb9 | 270 | |
6708bb27 | 271 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
c66ac9db | 272 | " Response: 0x%02x, t_state: %d\n", |
abc1fd4f JE |
273 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
274 | tmr_p->function, tmr_p->response, cmd->t_state); | |
c66ac9db | 275 | |
2c9fa49e | 276 | target_put_cmd_and_wait(cmd); |
c66ac9db | 277 | } |
d050ffb9 NB |
278 | } |
279 | ||
2c9fa49e BVA |
280 | /** |
281 | * core_tmr_drain_state_list() - abort SCSI commands associated with a device | |
282 | * | |
283 | * @dev: Device for which to abort outstanding SCSI commands. | |
284 | * @prout_cmd: Pointer to the SCSI PREEMPT AND ABORT if this function is called | |
285 | * to realize the PREEMPT AND ABORT functionality. | |
286 | * @tmr_sess: Session through which the LUN RESET has been received. | |
287 | * @tas: Task Aborted Status (TAS) bit from the SCSI control mode page. | |
288 | * A quote from SPC-4, paragraph "7.5.10 Control mode page": | |
289 | * "A task aborted status (TAS) bit set to zero specifies that | |
290 | * aborted commands shall be terminated by the device server | |
291 | * without any response to the application client. A TAS bit set | |
292 | * to one specifies that commands aborted by the actions of an I_T | |
293 | * nexus other than the I_T nexus on which the command was | |
294 | * received shall be completed with TASK ABORTED status." | |
295 | * @preempt_and_abort_list: For the PREEMPT AND ABORT functionality, a list | |
296 | * with registrations that will be preempted. | |
297 | */ | |
cf572a96 | 298 | static void core_tmr_drain_state_list( |
d050ffb9 NB |
299 | struct se_device *dev, |
300 | struct se_cmd *prout_cmd, | |
ebde1ca5 | 301 | struct se_session *tmr_sess, |
d050ffb9 NB |
302 | int tas, |
303 | struct list_head *preempt_and_abort_list) | |
304 | { | |
305 | LIST_HEAD(drain_task_list); | |
febe562c | 306 | struct se_session *sess; |
cf572a96 | 307 | struct se_cmd *cmd, *next; |
d050ffb9 | 308 | unsigned long flags; |
febe562c | 309 | int rc; |
cf572a96 | 310 | |
c66ac9db | 311 | /* |
cf572a96 CH |
312 | * Complete outstanding commands with TASK_ABORTED SAM status. |
313 | * | |
c66ac9db NB |
314 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
315 | * for TMR LUN_RESET: | |
316 | * | |
317 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
318 | * other than the one that caused the SCSI device condition is | |
319 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
320 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
321 | * returned for aborted commands. | |
322 | * | |
323 | * d) If the logical unit reset is caused by a particular I_T nexus | |
324 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
325 | * (TASK_ABORTED status) applies. | |
326 | * | |
327 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
328 | * (no TASK_ABORTED SAM status) applies. | |
329 | * | |
330 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
331 | * in the Control Mode Page. | |
332 | */ | |
333 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 334 | list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { |
c66ac9db NB |
335 | /* |
336 | * For PREEMPT_AND_ABORT usage, only process commands | |
337 | * with a matching reservation key. | |
338 | */ | |
feae8564 | 339 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 340 | continue; |
cf572a96 | 341 | |
c66ac9db NB |
342 | /* |
343 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
344 | */ | |
345 | if (prout_cmd == cmd) | |
346 | continue; | |
347 | ||
febe562c NB |
348 | sess = cmd->se_sess; |
349 | if (WARN_ON_ONCE(!sess)) | |
350 | continue; | |
351 | ||
352 | spin_lock(&sess->sess_cmd_lock); | |
0f4a9431 | 353 | rc = __target_check_io_state(cmd, tmr_sess, tas); |
febe562c NB |
354 | spin_unlock(&sess->sess_cmd_lock); |
355 | if (!rc) | |
356 | continue; | |
357 | ||
cf572a96 CH |
358 | list_move_tail(&cmd->state_list, &drain_task_list); |
359 | cmd->state_active = false; | |
d050ffb9 NB |
360 | } |
361 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
362 | ||
363 | while (!list_empty(&drain_task_list)) { | |
cf572a96 | 364 | cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); |
febe562c | 365 | list_del_init(&cmd->state_list); |
c66ac9db | 366 | |
c00e6220 BVA |
367 | target_show_cmd("LUN_RESET: ", cmd); |
368 | pr_debug("LUN_RESET: ITT[0x%08llx] - %s pr_res_key: 0x%016Lx\n", | |
369 | cmd->tag, (preempt_and_abort_list) ? "preempt" : "", | |
370 | cmd->pr_res_key); | |
c66ac9db | 371 | |
2c9fa49e | 372 | target_put_cmd_and_wait(cmd); |
c66ac9db | 373 | } |
d050ffb9 NB |
374 | } |
375 | ||
d050ffb9 NB |
376 | int core_tmr_lun_reset( |
377 | struct se_device *dev, | |
378 | struct se_tmr_req *tmr, | |
379 | struct list_head *preempt_and_abort_list, | |
380 | struct se_cmd *prout_cmd) | |
381 | { | |
382 | struct se_node_acl *tmr_nacl = NULL; | |
383 | struct se_portal_group *tmr_tpg = NULL; | |
ebde1ca5 | 384 | struct se_session *tmr_sess = NULL; |
d050ffb9 NB |
385 | int tas; |
386 | /* | |
387 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
388 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
389 | * | |
390 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
391 | * tasks shall be terminated by the device server without any response | |
392 | * to the application client. A TAS bit set to one specifies that tasks | |
393 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
394 | * which the command was received shall be completed with TASK ABORTED | |
395 | * status (see SAM-4). | |
396 | */ | |
0fd97ccf | 397 | tas = dev->dev_attrib.emulate_tas; |
d050ffb9 NB |
398 | /* |
399 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
400 | * or struct se_device passthrough.. | |
401 | */ | |
402 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
ebde1ca5 NB |
403 | tmr_sess = tmr->task_cmd->se_sess; |
404 | tmr_nacl = tmr_sess->se_node_acl; | |
405 | tmr_tpg = tmr_sess->se_tpg; | |
d050ffb9 NB |
406 | if (tmr_nacl && tmr_tpg) { |
407 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
408 | " initiator port %s\n", | |
30c7ca93 | 409 | tmr_tpg->se_tpg_tfo->fabric_name, |
d050ffb9 NB |
410 | tmr_nacl->initiatorname); |
411 | } | |
412 | } | |
413 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
414 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
415 | dev->transport->name, tas); | |
416 | ||
417 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
ebde1ca5 | 418 | core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas, |
d050ffb9 | 419 | preempt_and_abort_list); |
af877292 | 420 | |
c66ac9db NB |
421 | /* |
422 | * Clear any legacy SPC-2 reservation when called during | |
423 | * LOGICAL UNIT RESET | |
424 | */ | |
6708bb27 | 425 | if (!preempt_and_abort_list && |
0fd97ccf | 426 | (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { |
c66ac9db NB |
427 | spin_lock(&dev->dev_reservation_lock); |
428 | dev->dev_reserved_node_acl = NULL; | |
0fd97ccf | 429 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
c66ac9db | 430 | spin_unlock(&dev->dev_reservation_lock); |
6708bb27 | 431 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
432 | } |
433 | ||
ee480683 | 434 | atomic_long_inc(&dev->num_resets); |
c66ac9db | 435 | |
6708bb27 | 436 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 437 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 438 | dev->transport->name); |
c66ac9db NB |
439 | return 0; |
440 | } | |
d050ffb9 | 441 |