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