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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 | ||
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 | ||
44 | #define DEBUG_LUN_RESET | |
45 | #ifdef DEBUG_LUN_RESET | |
46 | #define DEBUG_LR(x...) printk(KERN_INFO x) | |
47 | #else | |
48 | #define DEBUG_LR(x...) | |
49 | #endif | |
50 | ||
51 | struct se_tmr_req *core_tmr_alloc_req( | |
52 | struct se_cmd *se_cmd, | |
53 | void *fabric_tmr_ptr, | |
54 | u8 function) | |
55 | { | |
56 | struct se_tmr_req *tmr; | |
57 | ||
1e7de68c NB |
58 | tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ? |
59 | GFP_ATOMIC : GFP_KERNEL); | |
c66ac9db NB |
60 | if (!(tmr)) { |
61 | printk(KERN_ERR "Unable to allocate struct se_tmr_req\n"); | |
62 | return ERR_PTR(-ENOMEM); | |
63 | } | |
64 | tmr->task_cmd = se_cmd; | |
65 | tmr->fabric_tmr_ptr = fabric_tmr_ptr; | |
66 | tmr->function = function; | |
67 | INIT_LIST_HEAD(&tmr->tmr_list); | |
68 | ||
69 | return tmr; | |
70 | } | |
71 | EXPORT_SYMBOL(core_tmr_alloc_req); | |
72 | ||
73 | void core_tmr_release_req( | |
74 | struct se_tmr_req *tmr) | |
75 | { | |
76 | struct se_device *dev = tmr->tmr_dev; | |
77 | ||
7fd29aa9 NB |
78 | if (!dev) { |
79 | kmem_cache_free(se_tmr_req_cache, tmr); | |
80 | return; | |
81 | } | |
82 | ||
c66ac9db NB |
83 | spin_lock(&dev->se_tmr_lock); |
84 | list_del(&tmr->tmr_list); | |
c66ac9db | 85 | spin_unlock(&dev->se_tmr_lock); |
7fd29aa9 NB |
86 | |
87 | kmem_cache_free(se_tmr_req_cache, tmr); | |
c66ac9db NB |
88 | } |
89 | ||
90 | static void core_tmr_handle_tas_abort( | |
91 | struct se_node_acl *tmr_nacl, | |
92 | struct se_cmd *cmd, | |
93 | int tas, | |
94 | int fe_count) | |
95 | { | |
96 | if (!(fe_count)) { | |
97 | transport_cmd_finish_abort(cmd, 1); | |
98 | return; | |
99 | } | |
100 | /* | |
101 | * TASK ABORTED status (TAS) bit support | |
102 | */ | |
103 | if (((tmr_nacl != NULL) && | |
104 | (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) | |
105 | transport_send_task_abort(cmd); | |
106 | ||
107 | transport_cmd_finish_abort(cmd, 0); | |
108 | } | |
109 | ||
110 | int core_tmr_lun_reset( | |
111 | struct se_device *dev, | |
112 | struct se_tmr_req *tmr, | |
113 | struct list_head *preempt_and_abort_list, | |
114 | struct se_cmd *prout_cmd) | |
115 | { | |
116 | struct se_cmd *cmd; | |
117 | struct se_queue_req *qr, *qr_tmp; | |
118 | struct se_node_acl *tmr_nacl = NULL; | |
119 | struct se_portal_group *tmr_tpg = NULL; | |
e3d6f909 | 120 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
121 | struct se_tmr_req *tmr_p, *tmr_pp; |
122 | struct se_task *task, *task_tmp; | |
123 | unsigned long flags; | |
124 | int fe_count, state, tas; | |
125 | /* | |
126 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
127 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
128 | * | |
129 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
130 | * tasks shall be terminated by the device server without any response | |
131 | * to the application client. A TAS bit set to one specifies that tasks | |
132 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
133 | * which the command was received shall be completed with TASK ABORTED | |
134 | * status (see SAM-4). | |
135 | */ | |
e3d6f909 | 136 | tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; |
c66ac9db NB |
137 | /* |
138 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
139 | * or struct se_device passthrough.. | |
140 | */ | |
141 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
142 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; | |
143 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; | |
144 | if (tmr_nacl && tmr_tpg) { | |
145 | DEBUG_LR("LUN_RESET: TMR caller fabric: %s" | |
146 | " initiator port %s\n", | |
e3d6f909 | 147 | tmr_tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
148 | tmr_nacl->initiatorname); |
149 | } | |
150 | } | |
151 | DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n", | |
152 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
e3d6f909 | 153 | dev->transport->name, tas); |
c66ac9db NB |
154 | /* |
155 | * Release all pending and outgoing TMRs aside from the received | |
156 | * LUN_RESET tmr.. | |
157 | */ | |
158 | spin_lock(&dev->se_tmr_lock); | |
159 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { | |
160 | /* | |
161 | * Allow the received TMR to return with FUNCTION_COMPLETE. | |
162 | */ | |
163 | if (tmr && (tmr_p == tmr)) | |
164 | continue; | |
165 | ||
166 | cmd = tmr_p->task_cmd; | |
167 | if (!(cmd)) { | |
168 | printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n"); | |
169 | continue; | |
170 | } | |
171 | /* | |
172 | * If this function was called with a valid pr_res_key | |
173 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
174 | * skip non regisration key matching TMRs. | |
175 | */ | |
176 | if ((preempt_and_abort_list != NULL) && | |
177 | (core_scsi3_check_cdb_abort_and_preempt( | |
178 | preempt_and_abort_list, cmd) != 0)) | |
179 | continue; | |
180 | spin_unlock(&dev->se_tmr_lock); | |
181 | ||
e3d6f909 AG |
182 | spin_lock_irqsave(&cmd->t_task->t_state_lock, flags); |
183 | if (!(atomic_read(&cmd->t_task->t_transport_active))) { | |
184 | spin_unlock_irqrestore(&cmd->t_task->t_state_lock, flags); | |
c66ac9db NB |
185 | spin_lock(&dev->se_tmr_lock); |
186 | continue; | |
187 | } | |
188 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
e3d6f909 | 189 | spin_unlock_irqrestore(&cmd->t_task->t_state_lock, flags); |
c66ac9db NB |
190 | spin_lock(&dev->se_tmr_lock); |
191 | continue; | |
192 | } | |
193 | DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x," | |
194 | " Response: 0x%02x, t_state: %d\n", | |
195 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, | |
196 | tmr_p->function, tmr_p->response, cmd->t_state); | |
e3d6f909 | 197 | spin_unlock_irqrestore(&cmd->t_task->t_state_lock, flags); |
c66ac9db NB |
198 | |
199 | transport_cmd_finish_abort_tmr(cmd); | |
200 | spin_lock(&dev->se_tmr_lock); | |
201 | } | |
202 | spin_unlock(&dev->se_tmr_lock); | |
203 | /* | |
204 | * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. | |
205 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 | |
206 | * for TMR LUN_RESET: | |
207 | * | |
208 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
209 | * other than the one that caused the SCSI device condition is | |
210 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
211 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
212 | * returned for aborted commands. | |
213 | * | |
214 | * d) If the logical unit reset is caused by a particular I_T nexus | |
215 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
216 | * (TASK_ABORTED status) applies. | |
217 | * | |
218 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
219 | * (no TASK_ABORTED SAM status) applies. | |
220 | * | |
221 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
222 | * in the Control Mode Page. | |
223 | */ | |
224 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
225 | list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, | |
226 | t_state_list) { | |
e3d6f909 AG |
227 | if (!task->task_se_cmd) { |
228 | printk(KERN_ERR "task->task_se_cmd is NULL!\n"); | |
c66ac9db NB |
229 | continue; |
230 | } | |
e3d6f909 | 231 | cmd = task->task_se_cmd; |
c66ac9db | 232 | |
e3d6f909 AG |
233 | if (!cmd->t_task) { |
234 | printk(KERN_ERR "cmd->t_task is NULL for task: %p cmd:" | |
c66ac9db | 235 | " %p ITT: 0x%08x\n", task, cmd, |
e3d6f909 | 236 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
237 | continue; |
238 | } | |
239 | /* | |
240 | * For PREEMPT_AND_ABORT usage, only process commands | |
241 | * with a matching reservation key. | |
242 | */ | |
243 | if ((preempt_and_abort_list != NULL) && | |
244 | (core_scsi3_check_cdb_abort_and_preempt( | |
245 | preempt_and_abort_list, cmd) != 0)) | |
246 | continue; | |
247 | /* | |
248 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
249 | */ | |
250 | if (prout_cmd == cmd) | |
251 | continue; | |
252 | ||
253 | list_del(&task->t_state_list); | |
254 | atomic_set(&task->task_state_active, 0); | |
255 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
256 | ||
e3d6f909 | 257 | spin_lock_irqsave(&cmd->t_task->t_state_lock, flags); |
c66ac9db NB |
258 | DEBUG_LR("LUN_RESET: %s cmd: %p task: %p" |
259 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/" | |
260 | "def_t_state: %d/%d cdb: 0x%02x\n", | |
261 | (preempt_and_abort_list) ? "Preempt" : "", cmd, task, | |
e3d6f909 AG |
262 | cmd->se_tfo->get_task_tag(cmd), 0, |
263 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
264 | cmd->deferred_t_state, cmd->t_task->t_task_cdb[0]); | |
c66ac9db NB |
265 | DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
266 | " t_task_cdbs: %d t_task_cdbs_left: %d" | |
267 | " t_task_cdbs_sent: %d -- t_transport_active: %d" | |
268 | " t_transport_stop: %d t_transport_sent: %d\n", | |
e3d6f909 AG |
269 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
270 | cmd->t_task->t_task_cdbs, | |
271 | atomic_read(&cmd->t_task->t_task_cdbs_left), | |
272 | atomic_read(&cmd->t_task->t_task_cdbs_sent), | |
273 | atomic_read(&cmd->t_task->t_transport_active), | |
274 | atomic_read(&cmd->t_task->t_transport_stop), | |
275 | atomic_read(&cmd->t_task->t_transport_sent)); | |
c66ac9db NB |
276 | |
277 | if (atomic_read(&task->task_active)) { | |
278 | atomic_set(&task->task_stop, 1); | |
279 | spin_unlock_irqrestore( | |
e3d6f909 | 280 | &cmd->t_task->t_state_lock, flags); |
c66ac9db NB |
281 | |
282 | DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown" | |
283 | " for dev: %p\n", task, dev); | |
284 | wait_for_completion(&task->task_stop_comp); | |
285 | DEBUG_LR("LUN_RESET Completed task: %p shutdown for" | |
286 | " dev: %p\n", task, dev); | |
e3d6f909 AG |
287 | spin_lock_irqsave(&cmd->t_task->t_state_lock, flags); |
288 | atomic_dec(&cmd->t_task->t_task_cdbs_left); | |
c66ac9db NB |
289 | |
290 | atomic_set(&task->task_active, 0); | |
291 | atomic_set(&task->task_stop, 0); | |
52208ae3 NB |
292 | } else { |
293 | if (atomic_read(&task->task_execute_queue) != 0) | |
294 | transport_remove_task_from_execute_queue(task, dev); | |
c66ac9db NB |
295 | } |
296 | __transport_stop_task_timer(task, &flags); | |
297 | ||
e3d6f909 | 298 | if (!(atomic_dec_and_test(&cmd->t_task->t_task_cdbs_ex_left))) { |
c66ac9db | 299 | spin_unlock_irqrestore( |
e3d6f909 | 300 | &cmd->t_task->t_state_lock, flags); |
c66ac9db NB |
301 | DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for" |
302 | " t_task_cdbs_ex_left: %d\n", task, dev, | |
e3d6f909 | 303 | atomic_read(&cmd->t_task->t_task_cdbs_ex_left)); |
c66ac9db NB |
304 | |
305 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
306 | continue; | |
307 | } | |
e3d6f909 | 308 | fe_count = atomic_read(&cmd->t_task->t_fe_count); |
c66ac9db | 309 | |
e3d6f909 | 310 | if (atomic_read(&cmd->t_task->t_transport_active)) { |
c66ac9db NB |
311 | DEBUG_LR("LUN_RESET: got t_transport_active = 1 for" |
312 | " task: %p, t_fe_count: %d dev: %p\n", task, | |
313 | fe_count, dev); | |
e3d6f909 AG |
314 | atomic_set(&cmd->t_task->t_transport_aborted, 1); |
315 | spin_unlock_irqrestore(&cmd->t_task->t_state_lock, | |
c66ac9db NB |
316 | flags); |
317 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); | |
318 | ||
319 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
320 | continue; | |
321 | } | |
322 | DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p," | |
323 | " t_fe_count: %d dev: %p\n", task, fe_count, dev); | |
e3d6f909 AG |
324 | atomic_set(&cmd->t_task->t_transport_aborted, 1); |
325 | spin_unlock_irqrestore(&cmd->t_task->t_state_lock, flags); | |
c66ac9db NB |
326 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
327 | ||
328 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
329 | } | |
330 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
331 | /* | |
332 | * Release all commands remaining in the struct se_device cmd queue. | |
333 | * | |
334 | * This follows the same logic as above for the struct se_device | |
335 | * struct se_task state list, where commands are returned with | |
336 | * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD | |
337 | * reference, otherwise the struct se_cmd is released. | |
338 | */ | |
339 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
340 | list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) { | |
341 | cmd = (struct se_cmd *)qr->cmd; | |
342 | if (!(cmd)) { | |
343 | /* | |
344 | * Skip these for non PREEMPT_AND_ABORT usage.. | |
345 | */ | |
346 | if (preempt_and_abort_list != NULL) | |
347 | continue; | |
348 | ||
349 | atomic_dec(&qobj->queue_cnt); | |
350 | list_del(&qr->qr_list); | |
351 | kfree(qr); | |
352 | continue; | |
353 | } | |
354 | /* | |
355 | * For PREEMPT_AND_ABORT usage, only process commands | |
356 | * with a matching reservation key. | |
357 | */ | |
358 | if ((preempt_and_abort_list != NULL) && | |
359 | (core_scsi3_check_cdb_abort_and_preempt( | |
360 | preempt_and_abort_list, cmd) != 0)) | |
361 | continue; | |
362 | /* | |
363 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
364 | */ | |
365 | if (prout_cmd == cmd) | |
366 | continue; | |
367 | ||
e3d6f909 | 368 | atomic_dec(&cmd->t_task->t_transport_queue_active); |
c66ac9db NB |
369 | atomic_dec(&qobj->queue_cnt); |
370 | list_del(&qr->qr_list); | |
371 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
372 | ||
373 | state = qr->state; | |
374 | kfree(qr); | |
375 | ||
376 | DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:" | |
377 | " %d t_fe_count: %d\n", (preempt_and_abort_list) ? | |
378 | "Preempt" : "", cmd, state, | |
e3d6f909 | 379 | atomic_read(&cmd->t_task->t_fe_count)); |
c66ac9db NB |
380 | /* |
381 | * Signal that the command has failed via cmd->se_cmd_flags, | |
382 | * and call TFO->new_cmd_failure() to wakeup any fabric | |
383 | * dependent code used to wait for unsolicited data out | |
384 | * allocation to complete. The fabric module is expected | |
385 | * to dump any remaining unsolicited data out for the aborted | |
386 | * command at this point. | |
387 | */ | |
388 | transport_new_cmd_failure(cmd); | |
389 | ||
390 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, | |
e3d6f909 | 391 | atomic_read(&cmd->t_task->t_fe_count)); |
c66ac9db NB |
392 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
393 | } | |
394 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
395 | /* | |
396 | * Clear any legacy SPC-2 reservation when called during | |
397 | * LOGICAL UNIT RESET | |
398 | */ | |
399 | if (!(preempt_and_abort_list) && | |
400 | (dev->dev_flags & DF_SPC2_RESERVATIONS)) { | |
401 | spin_lock(&dev->dev_reservation_lock); | |
402 | dev->dev_reserved_node_acl = NULL; | |
403 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; | |
404 | spin_unlock(&dev->dev_reservation_lock); | |
405 | printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n"); | |
406 | } | |
407 | ||
1e7de68c | 408 | spin_lock_irq(&dev->stats_lock); |
c66ac9db | 409 | dev->num_resets++; |
1e7de68c | 410 | spin_unlock_irq(&dev->stats_lock); |
c66ac9db NB |
411 | |
412 | DEBUG_LR("LUN_RESET: %s for [%s] Complete\n", | |
413 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
e3d6f909 | 414 | dev->transport->name); |
c66ac9db NB |
415 | return 0; |
416 | } |