Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_tmr.c | |
3 | * | |
4 | * This file contains SPC-3 task management infrastructure | |
5 | * | |
fd9a11d7 | 6 | * (c) Copyright 2009-2012 RisingTide Systems LLC. |
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 | ||
67 | void core_tmr_release_req( | |
68 | struct se_tmr_req *tmr) | |
69 | { | |
70 | struct se_device *dev = tmr->tmr_dev; | |
d050ffb9 | 71 | unsigned long flags; |
c66ac9db | 72 | |
7fd29aa9 | 73 | if (!dev) { |
c8e31f26 | 74 | kfree(tmr); |
7fd29aa9 NB |
75 | return; |
76 | } | |
77 | ||
d050ffb9 | 78 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db | 79 | list_del(&tmr->tmr_list); |
d050ffb9 | 80 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
7fd29aa9 | 81 | |
c8e31f26 | 82 | kfree(tmr); |
c66ac9db NB |
83 | } |
84 | ||
85 | static void core_tmr_handle_tas_abort( | |
86 | struct se_node_acl *tmr_nacl, | |
87 | struct se_cmd *cmd, | |
88 | int tas, | |
89 | int fe_count) | |
90 | { | |
6708bb27 | 91 | if (!fe_count) { |
c66ac9db NB |
92 | transport_cmd_finish_abort(cmd, 1); |
93 | return; | |
94 | } | |
95 | /* | |
96 | * TASK ABORTED status (TAS) bit support | |
97 | */ | |
6708bb27 | 98 | if ((tmr_nacl && |
c66ac9db NB |
99 | (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) |
100 | transport_send_task_abort(cmd); | |
101 | ||
102 | transport_cmd_finish_abort(cmd, 0); | |
103 | } | |
104 | ||
feae8564 JE |
105 | static int target_check_cdb_and_preempt(struct list_head *list, |
106 | struct se_cmd *cmd) | |
c165f69c | 107 | { |
feae8564 | 108 | struct t10_pr_registration *reg; |
c165f69c | 109 | |
feae8564 JE |
110 | if (!list) |
111 | return 0; | |
112 | list_for_each_entry(reg, list, pr_reg_abort_list) { | |
113 | if (reg->pr_res_key == cmd->pr_res_key) | |
c165f69c JE |
114 | return 0; |
115 | } | |
116 | ||
117 | return 1; | |
118 | } | |
119 | ||
3d28934a NB |
120 | void core_tmr_abort_task( |
121 | struct se_device *dev, | |
122 | struct se_tmr_req *tmr, | |
123 | struct se_session *se_sess) | |
124 | { | |
125 | struct se_cmd *se_cmd, *tmp_cmd; | |
126 | unsigned long flags; | |
127 | int ref_tag; | |
128 | ||
129 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
130 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
131 | &se_sess->sess_cmd_list, se_cmd_list) { | |
132 | ||
133 | if (dev != se_cmd->se_dev) | |
134 | continue; | |
135 | ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd); | |
136 | if (tmr->ref_task_tag != ref_tag) | |
137 | continue; | |
138 | ||
139 | printk("ABORT_TASK: Found referenced %s task_tag: %u\n", | |
140 | se_cmd->se_tfo->get_fabric_name(), ref_tag); | |
141 | ||
ab74b3d6 | 142 | spin_lock(&se_cmd->t_state_lock); |
3d28934a NB |
143 | if (se_cmd->transport_state & CMD_T_COMPLETE) { |
144 | printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag); | |
ab74b3d6 | 145 | spin_unlock(&se_cmd->t_state_lock); |
3d28934a NB |
146 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
147 | goto out; | |
148 | } | |
149 | se_cmd->transport_state |= CMD_T_ABORTED; | |
ab74b3d6 | 150 | spin_unlock(&se_cmd->t_state_lock); |
3d28934a NB |
151 | |
152 | list_del_init(&se_cmd->se_cmd_list); | |
153 | kref_get(&se_cmd->cmd_kref); | |
154 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
155 | ||
156 | cancel_work_sync(&se_cmd->work); | |
157 | transport_wait_for_tasks(se_cmd); | |
158 | /* | |
159 | * Now send SAM_STAT_TASK_ABORTED status for the referenced | |
160 | * se_cmd descriptor.. | |
161 | */ | |
162 | transport_send_task_abort(se_cmd); | |
163 | /* | |
164 | * Also deal with possible extra acknowledge reference.. | |
165 | */ | |
166 | if (se_cmd->se_cmd_flags & SCF_ACK_KREF) | |
167 | target_put_sess_cmd(se_sess, se_cmd); | |
168 | ||
169 | target_put_sess_cmd(se_sess, se_cmd); | |
170 | ||
171 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" | |
172 | " ref_tag: %d\n", ref_tag); | |
173 | tmr->response = TMR_FUNCTION_COMPLETE; | |
174 | return; | |
175 | } | |
176 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
177 | ||
178 | out: | |
179 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n", | |
180 | tmr->ref_task_tag); | |
181 | tmr->response = TMR_TASK_DOES_NOT_EXIST; | |
182 | } | |
183 | ||
d050ffb9 | 184 | static void core_tmr_drain_tmr_list( |
c66ac9db NB |
185 | struct se_device *dev, |
186 | struct se_tmr_req *tmr, | |
d050ffb9 | 187 | struct list_head *preempt_and_abort_list) |
c66ac9db | 188 | { |
d050ffb9 | 189 | LIST_HEAD(drain_tmr_list); |
c66ac9db | 190 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 191 | struct se_cmd *cmd; |
c66ac9db | 192 | unsigned long flags; |
c66ac9db NB |
193 | /* |
194 | * Release all pending and outgoing TMRs aside from the received | |
195 | * LUN_RESET tmr.. | |
196 | */ | |
d050ffb9 | 197 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
c66ac9db NB |
198 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
199 | /* | |
200 | * Allow the received TMR to return with FUNCTION_COMPLETE. | |
201 | */ | |
abc1fd4f | 202 | if (tmr_p == tmr) |
c66ac9db NB |
203 | continue; |
204 | ||
205 | cmd = tmr_p->task_cmd; | |
6708bb27 AG |
206 | if (!cmd) { |
207 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
208 | continue; |
209 | } | |
210 | /* | |
211 | * If this function was called with a valid pr_res_key | |
212 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
213 | * skip non regisration key matching TMRs. | |
214 | */ | |
feae8564 | 215 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 216 | continue; |
c66ac9db | 217 | |
d050ffb9 | 218 | spin_lock(&cmd->t_state_lock); |
7d680f3b | 219 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d050ffb9 | 220 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
221 | continue; |
222 | } | |
223 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { | |
d050ffb9 | 224 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
225 | continue; |
226 | } | |
d050ffb9 NB |
227 | spin_unlock(&cmd->t_state_lock); |
228 | ||
6eb40b2a | 229 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
d050ffb9 NB |
230 | } |
231 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); | |
232 | ||
abc1fd4f | 233 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
b8a11d73 | 234 | list_del_init(&tmr_p->tmr_list); |
abc1fd4f | 235 | cmd = tmr_p->task_cmd; |
d050ffb9 | 236 | |
6708bb27 | 237 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
c66ac9db | 238 | " Response: 0x%02x, t_state: %d\n", |
abc1fd4f JE |
239 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
240 | tmr_p->function, tmr_p->response, cmd->t_state); | |
c66ac9db | 241 | |
8dc52b54 | 242 | transport_cmd_finish_abort(cmd, 1); |
c66ac9db | 243 | } |
d050ffb9 NB |
244 | } |
245 | ||
cf572a96 | 246 | static void core_tmr_drain_state_list( |
d050ffb9 NB |
247 | struct se_device *dev, |
248 | struct se_cmd *prout_cmd, | |
249 | struct se_node_acl *tmr_nacl, | |
250 | int tas, | |
251 | struct list_head *preempt_and_abort_list) | |
252 | { | |
253 | LIST_HEAD(drain_task_list); | |
cf572a96 | 254 | struct se_cmd *cmd, *next; |
d050ffb9 NB |
255 | unsigned long flags; |
256 | int fe_count; | |
cf572a96 | 257 | |
c66ac9db | 258 | /* |
cf572a96 CH |
259 | * Complete outstanding commands with TASK_ABORTED SAM status. |
260 | * | |
c66ac9db NB |
261 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
262 | * for TMR LUN_RESET: | |
263 | * | |
264 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
265 | * other than the one that caused the SCSI device condition is | |
266 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
267 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
268 | * returned for aborted commands. | |
269 | * | |
270 | * d) If the logical unit reset is caused by a particular I_T nexus | |
271 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
272 | * (TASK_ABORTED status) applies. | |
273 | * | |
274 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
275 | * (no TASK_ABORTED SAM status) applies. | |
276 | * | |
277 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
278 | * in the Control Mode Page. | |
279 | */ | |
280 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 281 | list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { |
c66ac9db NB |
282 | /* |
283 | * For PREEMPT_AND_ABORT usage, only process commands | |
284 | * with a matching reservation key. | |
285 | */ | |
feae8564 | 286 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 287 | continue; |
cf572a96 | 288 | |
c66ac9db NB |
289 | /* |
290 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
291 | */ | |
292 | if (prout_cmd == cmd) | |
293 | continue; | |
294 | ||
cf572a96 CH |
295 | list_move_tail(&cmd->state_list, &drain_task_list); |
296 | cmd->state_active = false; | |
d050ffb9 NB |
297 | } |
298 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
299 | ||
300 | while (!list_empty(&drain_task_list)) { | |
cf572a96 CH |
301 | cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); |
302 | list_del(&cmd->state_list); | |
c66ac9db | 303 | |
cf572a96 | 304 | pr_debug("LUN_RESET: %s cmd: %p" |
f2da9dbd CH |
305 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" |
306 | "cdb: 0x%02x\n", | |
cf572a96 | 307 | (preempt_and_abort_list) ? "Preempt" : "", cmd, |
e3d6f909 AG |
308 | cmd->se_tfo->get_task_tag(cmd), 0, |
309 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
f2da9dbd | 310 | cmd->t_task_cdb[0]); |
6708bb27 | 311 | pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
785fdf70 | 312 | " -- CMD_T_ACTIVE: %d" |
7d680f3b | 313 | " CMD_T_STOP: %d CMD_T_SENT: %d\n", |
e3d6f909 | 314 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
7d680f3b CH |
315 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
316 | (cmd->transport_state & CMD_T_STOP) != 0, | |
317 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 318 | |
35e0e757 CH |
319 | /* |
320 | * If the command may be queued onto a workqueue cancel it now. | |
321 | * | |
322 | * This is equivalent to removal from the execute queue in the | |
323 | * loop above, but we do it down here given that | |
324 | * cancel_work_sync may block. | |
325 | */ | |
326 | if (cmd->t_state == TRANSPORT_COMPLETE) | |
327 | cancel_work_sync(&cmd->work); | |
328 | ||
cdbb70bb | 329 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 330 | target_stop_cmd(cmd, &flags); |
c66ac9db | 331 | |
a1d8b49a | 332 | fe_count = atomic_read(&cmd->t_fe_count); |
c66ac9db | 333 | |
7d680f3b | 334 | cmd->transport_state |= CMD_T_ABORTED; |
a1d8b49a | 335 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 336 | |
d050ffb9 | 337 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
c66ac9db | 338 | } |
d050ffb9 NB |
339 | } |
340 | ||
d050ffb9 NB |
341 | int core_tmr_lun_reset( |
342 | struct se_device *dev, | |
343 | struct se_tmr_req *tmr, | |
344 | struct list_head *preempt_and_abort_list, | |
345 | struct se_cmd *prout_cmd) | |
346 | { | |
347 | struct se_node_acl *tmr_nacl = NULL; | |
348 | struct se_portal_group *tmr_tpg = NULL; | |
349 | int tas; | |
350 | /* | |
351 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
352 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
353 | * | |
354 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
355 | * tasks shall be terminated by the device server without any response | |
356 | * to the application client. A TAS bit set to one specifies that tasks | |
357 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
358 | * which the command was received shall be completed with TASK ABORTED | |
359 | * status (see SAM-4). | |
360 | */ | |
0fd97ccf | 361 | tas = dev->dev_attrib.emulate_tas; |
d050ffb9 NB |
362 | /* |
363 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
364 | * or struct se_device passthrough.. | |
365 | */ | |
366 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
367 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; | |
368 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; | |
369 | if (tmr_nacl && tmr_tpg) { | |
370 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
371 | " initiator port %s\n", | |
372 | tmr_tpg->se_tpg_tfo->get_fabric_name(), | |
373 | tmr_nacl->initiatorname); | |
374 | } | |
375 | } | |
376 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
377 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
378 | dev->transport->name, tas); | |
379 | ||
380 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
cf572a96 | 381 | core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas, |
d050ffb9 | 382 | preempt_and_abort_list); |
af877292 | 383 | |
c66ac9db NB |
384 | /* |
385 | * Clear any legacy SPC-2 reservation when called during | |
386 | * LOGICAL UNIT RESET | |
387 | */ | |
6708bb27 | 388 | if (!preempt_and_abort_list && |
0fd97ccf | 389 | (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { |
c66ac9db NB |
390 | spin_lock(&dev->dev_reservation_lock); |
391 | dev->dev_reserved_node_acl = NULL; | |
0fd97ccf | 392 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
c66ac9db | 393 | spin_unlock(&dev->dev_reservation_lock); |
6708bb27 | 394 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
395 | } |
396 | ||
1e7de68c | 397 | spin_lock_irq(&dev->stats_lock); |
c66ac9db | 398 | dev->num_resets++; |
1e7de68c | 399 | spin_unlock_irq(&dev->stats_lock); |
c66ac9db | 400 | |
6708bb27 | 401 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 402 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 403 | dev->transport->name); |
c66ac9db NB |
404 | return 0; |
405 | } | |
d050ffb9 | 406 |