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c66ac9db NB |
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 | ||
c66ac9db NB |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/list.h> | |
c53181af | 30 | #include <linux/export.h> |
c66ac9db NB |
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 | ||
c66ac9db NB |
44 | struct se_tmr_req *core_tmr_alloc_req( |
45 | struct se_cmd *se_cmd, | |
46 | void *fabric_tmr_ptr, | |
dd503a5f RD |
47 | u8 function, |
48 | gfp_t gfp_flags) | |
c66ac9db NB |
49 | { |
50 | struct se_tmr_req *tmr; | |
51 | ||
dd503a5f | 52 | tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags); |
6708bb27 AG |
53 | if (!tmr) { |
54 | pr_err("Unable to allocate struct se_tmr_req\n"); | |
c66ac9db NB |
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 | } | |
64 | EXPORT_SYMBOL(core_tmr_alloc_req); | |
65 | ||
66 | void core_tmr_release_req( | |
67 | struct se_tmr_req *tmr) | |
68 | { | |
69 | struct se_device *dev = tmr->tmr_dev; | |
d050ffb9 | 70 | unsigned long flags; |
c66ac9db | 71 | |
7fd29aa9 NB |
72 | if (!dev) { |
73 | kmem_cache_free(se_tmr_req_cache, tmr); | |
74 | return; | |
75 | } | |
76 | ||
d050ffb9 | 77 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db | 78 | list_del(&tmr->tmr_list); |
d050ffb9 | 79 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
7fd29aa9 NB |
80 | |
81 | kmem_cache_free(se_tmr_req_cache, tmr); | |
c66ac9db NB |
82 | } |
83 | ||
84 | static void core_tmr_handle_tas_abort( | |
85 | struct se_node_acl *tmr_nacl, | |
86 | struct se_cmd *cmd, | |
87 | int tas, | |
88 | int fe_count) | |
89 | { | |
6708bb27 | 90 | if (!fe_count) { |
c66ac9db NB |
91 | transport_cmd_finish_abort(cmd, 1); |
92 | return; | |
93 | } | |
94 | /* | |
95 | * TASK ABORTED status (TAS) bit support | |
96 | */ | |
6708bb27 | 97 | if ((tmr_nacl && |
c66ac9db NB |
98 | (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) |
99 | transport_send_task_abort(cmd); | |
100 | ||
101 | transport_cmd_finish_abort(cmd, 0); | |
102 | } | |
103 | ||
d050ffb9 | 104 | static void core_tmr_drain_tmr_list( |
c66ac9db NB |
105 | struct se_device *dev, |
106 | struct se_tmr_req *tmr, | |
d050ffb9 | 107 | struct list_head *preempt_and_abort_list) |
c66ac9db | 108 | { |
d050ffb9 | 109 | LIST_HEAD(drain_tmr_list); |
c66ac9db | 110 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 111 | struct se_cmd *cmd; |
c66ac9db | 112 | unsigned long flags; |
c66ac9db NB |
113 | /* |
114 | * Release all pending and outgoing TMRs aside from the received | |
115 | * LUN_RESET tmr.. | |
116 | */ | |
d050ffb9 | 117 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db NB |
118 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
119 | /* | |
120 | * Allow the received TMR to return with FUNCTION_COMPLETE. | |
121 | */ | |
abc1fd4f | 122 | if (tmr_p == tmr) |
c66ac9db NB |
123 | continue; |
124 | ||
125 | cmd = tmr_p->task_cmd; | |
6708bb27 AG |
126 | if (!cmd) { |
127 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
128 | continue; |
129 | } | |
130 | /* | |
131 | * If this function was called with a valid pr_res_key | |
132 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
133 | * skip non regisration key matching TMRs. | |
134 | */ | |
6708bb27 | 135 | if (preempt_and_abort_list && |
c66ac9db NB |
136 | (core_scsi3_check_cdb_abort_and_preempt( |
137 | preempt_and_abort_list, cmd) != 0)) | |
138 | continue; | |
c66ac9db | 139 | |
d050ffb9 | 140 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 141 | if (!atomic_read(&cmd->t_transport_active)) { |
d050ffb9 | 142 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
143 | continue; |
144 | } | |
145 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
d050ffb9 | 146 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
147 | continue; |
148 | } | |
d050ffb9 NB |
149 | spin_unlock(&cmd->t_state_lock); |
150 | ||
6eb40b2a | 151 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
d050ffb9 NB |
152 | } |
153 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
154 | ||
abc1fd4f | 155 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
b8a11d73 | 156 | list_del_init(&tmr_p->tmr_list); |
abc1fd4f | 157 | cmd = tmr_p->task_cmd; |
d050ffb9 | 158 | |
6708bb27 | 159 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
c66ac9db | 160 | " Response: 0x%02x, t_state: %d\n", |
abc1fd4f JE |
161 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
162 | tmr_p->function, tmr_p->response, cmd->t_state); | |
c66ac9db | 163 | |
8dc52b54 | 164 | transport_cmd_finish_abort(cmd, 1); |
c66ac9db | 165 | } |
d050ffb9 NB |
166 | } |
167 | ||
168 | static void core_tmr_drain_task_list( | |
169 | struct se_device *dev, | |
170 | struct se_cmd *prout_cmd, | |
171 | struct se_node_acl *tmr_nacl, | |
172 | int tas, | |
173 | struct list_head *preempt_and_abort_list) | |
174 | { | |
175 | LIST_HEAD(drain_task_list); | |
176 | struct se_cmd *cmd; | |
177 | struct se_task *task, *task_tmp; | |
178 | unsigned long flags; | |
179 | int fe_count; | |
c66ac9db NB |
180 | /* |
181 | * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. | |
182 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 | |
183 | * for TMR LUN_RESET: | |
184 | * | |
185 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
186 | * other than the one that caused the SCSI device condition is | |
187 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
188 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
189 | * returned for aborted commands. | |
190 | * | |
191 | * d) If the logical unit reset is caused by a particular I_T nexus | |
192 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
193 | * (TASK_ABORTED status) applies. | |
194 | * | |
195 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
196 | * (no TASK_ABORTED SAM status) applies. | |
197 | * | |
198 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
199 | * in the Control Mode Page. | |
200 | */ | |
201 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
202 | list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, | |
203 | t_state_list) { | |
e3d6f909 | 204 | if (!task->task_se_cmd) { |
6708bb27 | 205 | pr_err("task->task_se_cmd is NULL!\n"); |
c66ac9db NB |
206 | continue; |
207 | } | |
e3d6f909 | 208 | cmd = task->task_se_cmd; |
c66ac9db | 209 | |
c66ac9db NB |
210 | /* |
211 | * For PREEMPT_AND_ABORT usage, only process commands | |
212 | * with a matching reservation key. | |
213 | */ | |
6708bb27 | 214 | if (preempt_and_abort_list && |
c66ac9db NB |
215 | (core_scsi3_check_cdb_abort_and_preempt( |
216 | preempt_and_abort_list, cmd) != 0)) | |
217 | continue; | |
218 | /* | |
219 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
220 | */ | |
221 | if (prout_cmd == cmd) | |
222 | continue; | |
223 | ||
d050ffb9 | 224 | list_move_tail(&task->t_state_list, &drain_task_list); |
c66ac9db | 225 | atomic_set(&task->task_state_active, 0); |
d050ffb9 NB |
226 | /* |
227 | * Remove from task execute list before processing drain_task_list | |
228 | */ | |
04629b7b CH |
229 | if (!list_empty(&task->t_execute_list)) |
230 | __transport_remove_task_from_execute_queue(task, dev); | |
d050ffb9 NB |
231 | } |
232 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
233 | ||
234 | while (!list_empty(&drain_task_list)) { | |
235 | task = list_entry(drain_task_list.next, struct se_task, t_state_list); | |
236 | list_del(&task->t_state_list); | |
237 | cmd = task->task_se_cmd; | |
c66ac9db | 238 | |
6708bb27 | 239 | pr_debug("LUN_RESET: %s cmd: %p task: %p" |
f2da9dbd CH |
240 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" |
241 | "cdb: 0x%02x\n", | |
c66ac9db | 242 | (preempt_and_abort_list) ? "Preempt" : "", cmd, task, |
e3d6f909 AG |
243 | cmd->se_tfo->get_task_tag(cmd), 0, |
244 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
f2da9dbd | 245 | cmd->t_task_cdb[0]); |
6708bb27 | 246 | pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
c66ac9db NB |
247 | " t_task_cdbs: %d t_task_cdbs_left: %d" |
248 | " t_task_cdbs_sent: %d -- t_transport_active: %d" | |
249 | " t_transport_stop: %d t_transport_sent: %d\n", | |
e3d6f909 | 250 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
a1d8b49a AG |
251 | cmd->t_task_list_num, |
252 | atomic_read(&cmd->t_task_cdbs_left), | |
253 | atomic_read(&cmd->t_task_cdbs_sent), | |
254 | atomic_read(&cmd->t_transport_active), | |
255 | atomic_read(&cmd->t_transport_stop), | |
256 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db | 257 | |
35e0e757 CH |
258 | /* |
259 | * If the command may be queued onto a workqueue cancel it now. | |
260 | * | |
261 | * This is equivalent to removal from the execute queue in the | |
262 | * loop above, but we do it down here given that | |
263 | * cancel_work_sync may block. | |
264 | */ | |
265 | if (cmd->t_state == TRANSPORT_COMPLETE) | |
266 | cancel_work_sync(&cmd->work); | |
267 | ||
cdbb70bb CH |
268 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
269 | target_stop_task(task, &flags); | |
c66ac9db | 270 | |
6708bb27 | 271 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) { |
d050ffb9 | 272 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
6708bb27 | 273 | pr_debug("LUN_RESET: Skipping task: %p, dev: %p for" |
c66ac9db | 274 | " t_task_cdbs_ex_left: %d\n", task, dev, |
a1d8b49a | 275 | atomic_read(&cmd->t_task_cdbs_ex_left)); |
c66ac9db NB |
276 | continue; |
277 | } | |
a1d8b49a | 278 | fe_count = atomic_read(&cmd->t_fe_count); |
c66ac9db | 279 | |
a1d8b49a | 280 | if (atomic_read(&cmd->t_transport_active)) { |
6708bb27 | 281 | pr_debug("LUN_RESET: got t_transport_active = 1 for" |
c66ac9db NB |
282 | " task: %p, t_fe_count: %d dev: %p\n", task, |
283 | fe_count, dev); | |
a1d8b49a | 284 | atomic_set(&cmd->t_transport_aborted, 1); |
d050ffb9 | 285 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 286 | |
d050ffb9 | 287 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
c66ac9db NB |
288 | continue; |
289 | } | |
6708bb27 | 290 | pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p," |
c66ac9db | 291 | " t_fe_count: %d dev: %p\n", task, fe_count, dev); |
a1d8b49a AG |
292 | atomic_set(&cmd->t_transport_aborted, 1); |
293 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 294 | |
d050ffb9 | 295 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
c66ac9db | 296 | } |
d050ffb9 NB |
297 | } |
298 | ||
299 | static void core_tmr_drain_cmd_list( | |
300 | struct se_device *dev, | |
301 | struct se_cmd *prout_cmd, | |
302 | struct se_node_acl *tmr_nacl, | |
303 | int tas, | |
304 | struct list_head *preempt_and_abort_list) | |
305 | { | |
306 | LIST_HEAD(drain_cmd_list); | |
307 | struct se_queue_obj *qobj = &dev->dev_queue_obj; | |
308 | struct se_cmd *cmd, *tcmd; | |
309 | unsigned long flags; | |
c66ac9db NB |
310 | /* |
311 | * Release all commands remaining in the struct se_device cmd queue. | |
312 | * | |
313 | * This follows the same logic as above for the struct se_device | |
314 | * struct se_task state list, where commands are returned with | |
315 | * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD | |
316 | * reference, otherwise the struct se_cmd is released. | |
317 | */ | |
318 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
5951146d | 319 | list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) { |
c66ac9db NB |
320 | /* |
321 | * For PREEMPT_AND_ABORT usage, only process commands | |
322 | * with a matching reservation key. | |
323 | */ | |
6708bb27 | 324 | if (preempt_and_abort_list && |
c66ac9db NB |
325 | (core_scsi3_check_cdb_abort_and_preempt( |
326 | preempt_and_abort_list, cmd) != 0)) | |
327 | continue; | |
328 | /* | |
329 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
330 | */ | |
331 | if (prout_cmd == cmd) | |
332 | continue; | |
333 | ||
d050ffb9 | 334 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 335 | atomic_dec(&qobj->queue_cnt); |
d050ffb9 NB |
336 | list_move_tail(&cmd->se_queue_node, &drain_cmd_list); |
337 | } | |
338 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
339 | ||
340 | while (!list_empty(&drain_cmd_list)) { | |
341 | cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node); | |
79a7fef2 | 342 | list_del_init(&cmd->se_queue_node); |
c66ac9db | 343 | |
6708bb27 | 344 | pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" |
c66ac9db | 345 | " %d t_fe_count: %d\n", (preempt_and_abort_list) ? |
5951146d | 346 | "Preempt" : "", cmd, cmd->t_state, |
a1d8b49a | 347 | atomic_read(&cmd->t_fe_count)); |
c66ac9db NB |
348 | |
349 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, | |
a1d8b49a | 350 | atomic_read(&cmd->t_fe_count)); |
c66ac9db | 351 | } |
d050ffb9 NB |
352 | } |
353 | ||
354 | int core_tmr_lun_reset( | |
355 | struct se_device *dev, | |
356 | struct se_tmr_req *tmr, | |
357 | struct list_head *preempt_and_abort_list, | |
358 | struct se_cmd *prout_cmd) | |
359 | { | |
360 | struct se_node_acl *tmr_nacl = NULL; | |
361 | struct se_portal_group *tmr_tpg = NULL; | |
362 | int tas; | |
363 | /* | |
364 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
365 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
366 | * | |
367 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
368 | * tasks shall be terminated by the device server without any response | |
369 | * to the application client. A TAS bit set to one specifies that tasks | |
370 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
371 | * which the command was received shall be completed with TASK ABORTED | |
372 | * status (see SAM-4). | |
373 | */ | |
374 | tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; | |
375 | /* | |
376 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
377 | * or struct se_device passthrough.. | |
378 | */ | |
379 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
380 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; | |
381 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; | |
382 | if (tmr_nacl && tmr_tpg) { | |
383 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
384 | " initiator port %s\n", | |
385 | tmr_tpg->se_tpg_tfo->get_fabric_name(), | |
386 | tmr_nacl->initiatorname); | |
387 | } | |
388 | } | |
389 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
390 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
391 | dev->transport->name, tas); | |
392 | ||
393 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
394 | core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas, | |
395 | preempt_and_abort_list); | |
396 | core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas, | |
397 | preempt_and_abort_list); | |
c66ac9db NB |
398 | /* |
399 | * Clear any legacy SPC-2 reservation when called during | |
400 | * LOGICAL UNIT RESET | |
401 | */ | |
6708bb27 | 402 | if (!preempt_and_abort_list && |
c66ac9db NB |
403 | (dev->dev_flags & DF_SPC2_RESERVATIONS)) { |
404 | spin_lock(&dev->dev_reservation_lock); | |
405 | dev->dev_reserved_node_acl = NULL; | |
406 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; | |
407 | spin_unlock(&dev->dev_reservation_lock); | |
6708bb27 | 408 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
409 | } |
410 | ||
1e7de68c | 411 | spin_lock_irq(&dev->stats_lock); |
c66ac9db | 412 | dev->num_resets++; |
1e7de68c | 413 | spin_unlock_irq(&dev->stats_lock); |
c66ac9db | 414 | |
6708bb27 | 415 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 416 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 417 | dev->transport->name); |
c66ac9db NB |
418 | return 0; |
419 | } | |
d050ffb9 | 420 |