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 | #include <scsi/scsi.h> |
31 | #include <scsi/scsi_cmnd.h> | |
32 | ||
33 | #include <target/target_core_base.h> | |
c4795fb2 CH |
34 | #include <target/target_core_backend.h> |
35 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
36 | #include <target/target_core_configfs.h> |
37 | ||
e26d99ae | 38 | #include "target_core_internal.h" |
c66ac9db NB |
39 | #include "target_core_alua.h" |
40 | #include "target_core_pr.h" | |
41 | ||
c8e31f26 | 42 | int core_tmr_alloc_req( |
c66ac9db NB |
43 | struct se_cmd *se_cmd, |
44 | void *fabric_tmr_ptr, | |
dd503a5f RD |
45 | u8 function, |
46 | gfp_t gfp_flags) | |
c66ac9db NB |
47 | { |
48 | struct se_tmr_req *tmr; | |
49 | ||
c8e31f26 | 50 | tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); |
6708bb27 AG |
51 | if (!tmr) { |
52 | pr_err("Unable to allocate struct se_tmr_req\n"); | |
c8e31f26 | 53 | return -ENOMEM; |
c66ac9db | 54 | } |
c8e31f26 AG |
55 | |
56 | se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; | |
57 | se_cmd->se_tmr_req = tmr; | |
c66ac9db NB |
58 | tmr->task_cmd = se_cmd; |
59 | tmr->fabric_tmr_ptr = fabric_tmr_ptr; | |
60 | tmr->function = function; | |
61 | INIT_LIST_HEAD(&tmr->tmr_list); | |
62 | ||
c8e31f26 | 63 | return 0; |
c66ac9db NB |
64 | } |
65 | EXPORT_SYMBOL(core_tmr_alloc_req); | |
66 | ||
8f832690 | 67 | void core_tmr_release_req(struct se_tmr_req *tmr) |
c66ac9db NB |
68 | { |
69 | struct se_device *dev = tmr->tmr_dev; | |
d050ffb9 | 70 | unsigned long flags; |
c66ac9db | 71 | |
8f832690 JE |
72 | if (dev) { |
73 | spin_lock_irqsave(&dev->se_tmr_lock, flags); | |
74 | list_del(&tmr->tmr_list); | |
75 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
7fd29aa9 NB |
76 | } |
77 | ||
c8e31f26 | 78 | kfree(tmr); |
c66ac9db NB |
79 | } |
80 | ||
81 | static void core_tmr_handle_tas_abort( | |
82 | struct se_node_acl *tmr_nacl, | |
83 | struct se_cmd *cmd, | |
c1c35d52 | 84 | int tas) |
c66ac9db | 85 | { |
68259b5a | 86 | bool remove = true; |
c66ac9db NB |
87 | /* |
88 | * TASK ABORTED status (TAS) bit support | |
8f832690 JE |
89 | */ |
90 | if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) { | |
68259b5a | 91 | remove = false; |
c66ac9db | 92 | transport_send_task_abort(cmd); |
68259b5a | 93 | } |
c66ac9db | 94 | |
68259b5a | 95 | transport_cmd_finish_abort(cmd, remove); |
c66ac9db NB |
96 | } |
97 | ||
feae8564 JE |
98 | static int target_check_cdb_and_preempt(struct list_head *list, |
99 | struct se_cmd *cmd) | |
c165f69c | 100 | { |
feae8564 | 101 | struct t10_pr_registration *reg; |
c165f69c | 102 | |
feae8564 JE |
103 | if (!list) |
104 | return 0; | |
105 | list_for_each_entry(reg, list, pr_reg_abort_list) { | |
106 | if (reg->pr_res_key == cmd->pr_res_key) | |
c165f69c JE |
107 | return 0; |
108 | } | |
109 | ||
110 | return 1; | |
111 | } | |
112 | ||
3d28934a NB |
113 | void core_tmr_abort_task( |
114 | struct se_device *dev, | |
115 | struct se_tmr_req *tmr, | |
116 | struct se_session *se_sess) | |
117 | { | |
f81ccb48 | 118 | struct se_cmd *se_cmd; |
3d28934a NB |
119 | unsigned long flags; |
120 | int ref_tag; | |
121 | ||
122 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
f81ccb48 | 123 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { |
3d28934a NB |
124 | |
125 | if (dev != se_cmd->se_dev) | |
126 | continue; | |
47b1584c | 127 | |
dc0fafda BVA |
128 | /* skip task management functions, including tmr->task_cmd */ |
129 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
47b1584c AL |
130 | continue; |
131 | ||
3d28934a NB |
132 | ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd); |
133 | if (tmr->ref_task_tag != ref_tag) | |
134 | continue; | |
135 | ||
136 | printk("ABORT_TASK: Found referenced %s task_tag: %u\n", | |
137 | se_cmd->se_tfo->get_fabric_name(), ref_tag); | |
138 | ||
ab74b3d6 | 139 | spin_lock(&se_cmd->t_state_lock); |
3d28934a NB |
140 | if (se_cmd->transport_state & CMD_T_COMPLETE) { |
141 | printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag); | |
ab74b3d6 | 142 | spin_unlock(&se_cmd->t_state_lock); |
3d28934a NB |
143 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
144 | goto out; | |
145 | } | |
146 | se_cmd->transport_state |= CMD_T_ABORTED; | |
ab74b3d6 | 147 | spin_unlock(&se_cmd->t_state_lock); |
3d28934a NB |
148 | |
149 | list_del_init(&se_cmd->se_cmd_list); | |
150 | kref_get(&se_cmd->cmd_kref); | |
151 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
152 | ||
153 | cancel_work_sync(&se_cmd->work); | |
154 | transport_wait_for_tasks(se_cmd); | |
3d28934a NB |
155 | |
156 | target_put_sess_cmd(se_sess, se_cmd); | |
68259b5a | 157 | transport_cmd_finish_abort(se_cmd, true); |
3d28934a NB |
158 | |
159 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" | |
160 | " ref_tag: %d\n", ref_tag); | |
161 | tmr->response = TMR_FUNCTION_COMPLETE; | |
162 | return; | |
163 | } | |
164 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
165 | ||
166 | out: | |
167 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n", | |
168 | tmr->ref_task_tag); | |
169 | tmr->response = TMR_TASK_DOES_NOT_EXIST; | |
170 | } | |
171 | ||
d050ffb9 | 172 | static void core_tmr_drain_tmr_list( |
c66ac9db NB |
173 | struct se_device *dev, |
174 | struct se_tmr_req *tmr, | |
d050ffb9 | 175 | struct list_head *preempt_and_abort_list) |
c66ac9db | 176 | { |
d050ffb9 | 177 | LIST_HEAD(drain_tmr_list); |
c66ac9db | 178 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 179 | struct se_cmd *cmd; |
c66ac9db | 180 | unsigned long flags; |
c66ac9db NB |
181 | /* |
182 | * Release all pending and outgoing TMRs aside from the received | |
183 | * LUN_RESET tmr.. | |
184 | */ | |
d050ffb9 | 185 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db NB |
186 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
187 | /* | |
188 | * Allow the received TMR to return with FUNCTION_COMPLETE. | |
189 | */ | |
abc1fd4f | 190 | if (tmr_p == tmr) |
c66ac9db NB |
191 | continue; |
192 | ||
193 | cmd = tmr_p->task_cmd; | |
6708bb27 AG |
194 | if (!cmd) { |
195 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
196 | continue; |
197 | } | |
198 | /* | |
199 | * If this function was called with a valid pr_res_key | |
200 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
201 | * skip non regisration key matching TMRs. | |
202 | */ | |
feae8564 | 203 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 204 | continue; |
c66ac9db | 205 | |
d050ffb9 | 206 | spin_lock(&cmd->t_state_lock); |
7d680f3b | 207 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d050ffb9 | 208 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
209 | continue; |
210 | } | |
211 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
d050ffb9 | 212 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
213 | continue; |
214 | } | |
d050ffb9 NB |
215 | spin_unlock(&cmd->t_state_lock); |
216 | ||
6eb40b2a | 217 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
d050ffb9 NB |
218 | } |
219 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
220 | ||
abc1fd4f | 221 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
b8a11d73 | 222 | list_del_init(&tmr_p->tmr_list); |
abc1fd4f | 223 | cmd = tmr_p->task_cmd; |
d050ffb9 | 224 | |
6708bb27 | 225 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
c66ac9db | 226 | " Response: 0x%02x, t_state: %d\n", |
abc1fd4f JE |
227 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
228 | tmr_p->function, tmr_p->response, cmd->t_state); | |
c66ac9db | 229 | |
8dc52b54 | 230 | transport_cmd_finish_abort(cmd, 1); |
c66ac9db | 231 | } |
d050ffb9 NB |
232 | } |
233 | ||
cf572a96 | 234 | static void core_tmr_drain_state_list( |
d050ffb9 NB |
235 | struct se_device *dev, |
236 | struct se_cmd *prout_cmd, | |
237 | struct se_node_acl *tmr_nacl, | |
238 | int tas, | |
239 | struct list_head *preempt_and_abort_list) | |
240 | { | |
241 | LIST_HEAD(drain_task_list); | |
cf572a96 | 242 | struct se_cmd *cmd, *next; |
d050ffb9 | 243 | unsigned long flags; |
cf572a96 | 244 | |
c66ac9db | 245 | /* |
cf572a96 CH |
246 | * Complete outstanding commands with TASK_ABORTED SAM status. |
247 | * | |
c66ac9db NB |
248 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
249 | * for TMR LUN_RESET: | |
250 | * | |
251 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
252 | * other than the one that caused the SCSI device condition is | |
253 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
254 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
255 | * returned for aborted commands. | |
256 | * | |
257 | * d) If the logical unit reset is caused by a particular I_T nexus | |
258 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
259 | * (TASK_ABORTED status) applies. | |
260 | * | |
261 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
262 | * (no TASK_ABORTED SAM status) applies. | |
263 | * | |
264 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
265 | * in the Control Mode Page. | |
266 | */ | |
267 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 268 | list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { |
c66ac9db NB |
269 | /* |
270 | * For PREEMPT_AND_ABORT usage, only process commands | |
271 | * with a matching reservation key. | |
272 | */ | |
feae8564 | 273 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 274 | continue; |
cf572a96 | 275 | |
c66ac9db NB |
276 | /* |
277 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
278 | */ | |
279 | if (prout_cmd == cmd) | |
280 | continue; | |
281 | ||
cf572a96 CH |
282 | list_move_tail(&cmd->state_list, &drain_task_list); |
283 | cmd->state_active = false; | |
d050ffb9 NB |
284 | } |
285 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
286 | ||
287 | while (!list_empty(&drain_task_list)) { | |
cf572a96 CH |
288 | cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); |
289 | list_del(&cmd->state_list); | |
c66ac9db | 290 | |
cf572a96 | 291 | pr_debug("LUN_RESET: %s cmd: %p" |
f2da9dbd CH |
292 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" |
293 | "cdb: 0x%02x\n", | |
cf572a96 | 294 | (preempt_and_abort_list) ? "Preempt" : "", cmd, |
e3d6f909 AG |
295 | cmd->se_tfo->get_task_tag(cmd), 0, |
296 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
f2da9dbd | 297 | cmd->t_task_cdb[0]); |
6708bb27 | 298 | pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
785fdf70 | 299 | " -- CMD_T_ACTIVE: %d" |
7d680f3b | 300 | " CMD_T_STOP: %d CMD_T_SENT: %d\n", |
e3d6f909 | 301 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
7d680f3b CH |
302 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
303 | (cmd->transport_state & CMD_T_STOP) != 0, | |
304 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 305 | |
35e0e757 CH |
306 | /* |
307 | * If the command may be queued onto a workqueue cancel it now. | |
308 | * | |
309 | * This is equivalent to removal from the execute queue in the | |
310 | * loop above, but we do it down here given that | |
311 | * cancel_work_sync may block. | |
312 | */ | |
313 | if (cmd->t_state == TRANSPORT_COMPLETE) | |
314 | cancel_work_sync(&cmd->work); | |
315 | ||
cdbb70bb | 316 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 317 | target_stop_cmd(cmd, &flags); |
c66ac9db | 318 | |
7d680f3b | 319 | cmd->transport_state |= CMD_T_ABORTED; |
a1d8b49a | 320 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 321 | |
c1c35d52 | 322 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas); |
c66ac9db | 323 | } |
d050ffb9 NB |
324 | } |
325 | ||
d050ffb9 NB |
326 | int core_tmr_lun_reset( |
327 | struct se_device *dev, | |
328 | struct se_tmr_req *tmr, | |
329 | struct list_head *preempt_and_abort_list, | |
330 | struct se_cmd *prout_cmd) | |
331 | { | |
332 | struct se_node_acl *tmr_nacl = NULL; | |
333 | struct se_portal_group *tmr_tpg = NULL; | |
334 | int tas; | |
335 | /* | |
336 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
337 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
338 | * | |
339 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
340 | * tasks shall be terminated by the device server without any response | |
341 | * to the application client. A TAS bit set to one specifies that tasks | |
342 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
343 | * which the command was received shall be completed with TASK ABORTED | |
344 | * status (see SAM-4). | |
345 | */ | |
0fd97ccf | 346 | tas = dev->dev_attrib.emulate_tas; |
d050ffb9 NB |
347 | /* |
348 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
349 | * or struct se_device passthrough.. | |
350 | */ | |
351 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
352 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; | |
353 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; | |
354 | if (tmr_nacl && tmr_tpg) { | |
355 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
356 | " initiator port %s\n", | |
357 | tmr_tpg->se_tpg_tfo->get_fabric_name(), | |
358 | tmr_nacl->initiatorname); | |
359 | } | |
360 | } | |
361 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
362 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
363 | dev->transport->name, tas); | |
364 | ||
365 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
cf572a96 | 366 | core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas, |
d050ffb9 | 367 | preempt_and_abort_list); |
af877292 | 368 | |
c66ac9db NB |
369 | /* |
370 | * Clear any legacy SPC-2 reservation when called during | |
371 | * LOGICAL UNIT RESET | |
372 | */ | |
6708bb27 | 373 | if (!preempt_and_abort_list && |
0fd97ccf | 374 | (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { |
c66ac9db NB |
375 | spin_lock(&dev->dev_reservation_lock); |
376 | dev->dev_reserved_node_acl = NULL; | |
0fd97ccf | 377 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
c66ac9db | 378 | spin_unlock(&dev->dev_reservation_lock); |
6708bb27 | 379 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
380 | } |
381 | ||
ee480683 | 382 | atomic_long_inc(&dev->num_resets); |
c66ac9db | 383 | |
6708bb27 | 384 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 385 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 386 | dev->transport->name); |
c66ac9db NB |
387 | return 0; |
388 | } | |
d050ffb9 | 389 |