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