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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c66ac9db NB |
2 | /******************************************************************************* |
3 | * Filename: target_core_tmr.c | |
4 | * | |
5 | * This file contains SPC-3 task management infrastructure | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2009-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
c66ac9db NB |
11 | ******************************************************************************/ |
12 | ||
c66ac9db NB |
13 | #include <linux/slab.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/list.h> | |
c53181af | 16 | #include <linux/export.h> |
c66ac9db NB |
17 | |
18 | #include <target/target_core_base.h> | |
c4795fb2 CH |
19 | #include <target/target_core_backend.h> |
20 | #include <target/target_core_fabric.h> | |
c66ac9db | 21 | |
e26d99ae | 22 | #include "target_core_internal.h" |
c66ac9db NB |
23 | #include "target_core_alua.h" |
24 | #include "target_core_pr.h" | |
25 | ||
c8e31f26 | 26 | int core_tmr_alloc_req( |
c66ac9db NB |
27 | struct se_cmd *se_cmd, |
28 | void *fabric_tmr_ptr, | |
dd503a5f RD |
29 | u8 function, |
30 | gfp_t gfp_flags) | |
c66ac9db NB |
31 | { |
32 | struct se_tmr_req *tmr; | |
33 | ||
c8e31f26 | 34 | tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); |
6708bb27 AG |
35 | if (!tmr) { |
36 | pr_err("Unable to allocate struct se_tmr_req\n"); | |
c8e31f26 | 37 | return -ENOMEM; |
c66ac9db | 38 | } |
c8e31f26 AG |
39 | |
40 | se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; | |
41 | se_cmd->se_tmr_req = tmr; | |
c66ac9db NB |
42 | tmr->task_cmd = se_cmd; |
43 | tmr->fabric_tmr_ptr = fabric_tmr_ptr; | |
44 | tmr->function = function; | |
45 | INIT_LIST_HEAD(&tmr->tmr_list); | |
46 | ||
c8e31f26 | 47 | return 0; |
c66ac9db NB |
48 | } |
49 | EXPORT_SYMBOL(core_tmr_alloc_req); | |
50 | ||
8f832690 | 51 | void core_tmr_release_req(struct se_tmr_req *tmr) |
c66ac9db NB |
52 | { |
53 | struct se_device *dev = tmr->tmr_dev; | |
d050ffb9 | 54 | unsigned long flags; |
c66ac9db | 55 | |
8f832690 JE |
56 | if (dev) { |
57 | spin_lock_irqsave(&dev->se_tmr_lock, flags); | |
a6d9bb1c | 58 | list_del_init(&tmr->tmr_list); |
8f832690 | 59 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
7fd29aa9 NB |
60 | } |
61 | ||
c8e31f26 | 62 | kfree(tmr); |
c66ac9db NB |
63 | } |
64 | ||
feae8564 JE |
65 | static int target_check_cdb_and_preempt(struct list_head *list, |
66 | struct se_cmd *cmd) | |
c165f69c | 67 | { |
feae8564 | 68 | struct t10_pr_registration *reg; |
c165f69c | 69 | |
feae8564 JE |
70 | if (!list) |
71 | return 0; | |
72 | list_for_each_entry(reg, list, pr_reg_abort_list) { | |
73 | if (reg->pr_res_key == cmd->pr_res_key) | |
c165f69c JE |
74 | return 0; |
75 | } | |
76 | ||
77 | return 1; | |
78 | } | |
79 | ||
0f4a9431 NB |
80 | static bool __target_check_io_state(struct se_cmd *se_cmd, |
81 | struct se_session *tmr_sess, int tas) | |
febe562c NB |
82 | { |
83 | struct se_session *sess = se_cmd->se_sess; | |
84 | ||
85 | assert_spin_locked(&sess->sess_cmd_lock); | |
86 | WARN_ON_ONCE(!irqs_disabled()); | |
87 | /* | |
88 | * If command already reached CMD_T_COMPLETE state within | |
0f4a9431 NB |
89 | * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown, |
90 | * this se_cmd has been passed to fabric driver and will | |
91 | * not be aborted. | |
febe562c NB |
92 | * |
93 | * Otherwise, obtain a local se_cmd->cmd_kref now for TMR | |
94 | * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as | |
95 | * long as se_cmd->cmd_kref is still active unless zero. | |
96 | */ | |
97 | spin_lock(&se_cmd->t_state_lock); | |
0f4a9431 NB |
98 | if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) { |
99 | pr_debug("Attempted to abort io tag: %llu already complete or" | |
100 | " fabric stop, skipping\n", se_cmd->tag); | |
101 | spin_unlock(&se_cmd->t_state_lock); | |
102 | return false; | |
103 | } | |
febe562c | 104 | se_cmd->transport_state |= CMD_T_ABORTED; |
0f4a9431 NB |
105 | |
106 | if ((tmr_sess != se_cmd->se_sess) && tas) | |
107 | se_cmd->transport_state |= CMD_T_TAS; | |
108 | ||
febe562c NB |
109 | spin_unlock(&se_cmd->t_state_lock); |
110 | ||
111 | return kref_get_unless_zero(&se_cmd->cmd_kref); | |
112 | } | |
113 | ||
3d28934a NB |
114 | void core_tmr_abort_task( |
115 | struct se_device *dev, | |
116 | struct se_tmr_req *tmr, | |
117 | struct se_session *se_sess) | |
118 | { | |
f81ccb48 | 119 | struct se_cmd *se_cmd; |
3d28934a | 120 | unsigned long flags; |
649ee054 | 121 | u64 ref_tag; |
3d28934a NB |
122 | |
123 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
f81ccb48 | 124 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { |
3d28934a NB |
125 | |
126 | if (dev != se_cmd->se_dev) | |
127 | continue; | |
47b1584c | 128 | |
dc0fafda BVA |
129 | /* skip task management functions, including tmr->task_cmd */ |
130 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
47b1584c AL |
131 | continue; |
132 | ||
649ee054 | 133 | ref_tag = se_cmd->tag; |
3d28934a NB |
134 | if (tmr->ref_task_tag != ref_tag) |
135 | continue; | |
136 | ||
649ee054 | 137 | printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", |
30c7ca93 | 138 | se_cmd->se_tfo->fabric_name, ref_tag); |
3d28934a | 139 | |
aaa00cc9 BVA |
140 | if (!__target_check_io_state(se_cmd, se_sess, |
141 | dev->dev_attrib.emulate_tas)) | |
3a1e7ca6 BVA |
142 | continue; |
143 | ||
3d28934a NB |
144 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
145 | ||
2c9fa49e BVA |
146 | /* |
147 | * Ensure that this ABORT request is visible to the LU RESET | |
148 | * code. | |
149 | */ | |
150 | if (!tmr->tmr_dev) | |
151 | WARN_ON_ONCE(transport_lookup_tmr_lun(tmr->task_cmd, | |
152 | se_cmd->orig_fe_lun) < 0); | |
3d28934a | 153 | |
2c9fa49e | 154 | target_put_cmd_and_wait(se_cmd); |
3d28934a NB |
155 | |
156 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" | |
649ee054 | 157 | " ref_tag: %llu\n", ref_tag); |
3d28934a | 158 | tmr->response = TMR_FUNCTION_COMPLETE; |
c87ba9c4 | 159 | atomic_long_inc(&dev->aborts_complete); |
3d28934a NB |
160 | return; |
161 | } | |
162 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
163 | ||
649ee054 | 164 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", |
3d28934a NB |
165 | tmr->ref_task_tag); |
166 | tmr->response = TMR_TASK_DOES_NOT_EXIST; | |
c87ba9c4 | 167 | atomic_long_inc(&dev->aborts_no_task); |
3d28934a NB |
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); |
a6d9bb1c | 176 | struct se_session *sess; |
c66ac9db | 177 | struct se_tmr_req *tmr_p, *tmr_pp; |
d050ffb9 | 178 | struct se_cmd *cmd; |
c66ac9db | 179 | unsigned long flags; |
a6d9bb1c | 180 | bool rc; |
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); |
88fb2fa7 | 186 | if (tmr) |
187 | list_del_init(&tmr->tmr_list); | |
c66ac9db | 188 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
c66ac9db | 189 | cmd = tmr_p->task_cmd; |
6708bb27 AG |
190 | if (!cmd) { |
191 | pr_err("Unable to locate struct se_cmd for TMR\n"); | |
c66ac9db NB |
192 | continue; |
193 | } | |
194 | /* | |
195 | * If this function was called with a valid pr_res_key | |
196 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action | |
ac75d8be | 197 | * skip non registration key matching TMRs. |
c66ac9db | 198 | */ |
feae8564 | 199 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 200 | continue; |
c66ac9db | 201 | |
a6d9bb1c NB |
202 | sess = cmd->se_sess; |
203 | if (WARN_ON_ONCE(!sess)) | |
204 | continue; | |
205 | ||
206 | spin_lock(&sess->sess_cmd_lock); | |
2281c95f BVA |
207 | rc = __target_check_io_state(cmd, sess, 0); |
208 | spin_unlock(&sess->sess_cmd_lock); | |
d050ffb9 | 209 | |
a6d9bb1c NB |
210 | if (!rc) { |
211 | printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); | |
212 | continue; | |
213 | } | |
0f4a9431 | 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 | |
2c9fa49e | 228 | target_put_cmd_and_wait(cmd); |
c66ac9db | 229 | } |
d050ffb9 NB |
230 | } |
231 | ||
2c9fa49e BVA |
232 | /** |
233 | * core_tmr_drain_state_list() - abort SCSI commands associated with a device | |
234 | * | |
235 | * @dev: Device for which to abort outstanding SCSI commands. | |
236 | * @prout_cmd: Pointer to the SCSI PREEMPT AND ABORT if this function is called | |
237 | * to realize the PREEMPT AND ABORT functionality. | |
238 | * @tmr_sess: Session through which the LUN RESET has been received. | |
239 | * @tas: Task Aborted Status (TAS) bit from the SCSI control mode page. | |
240 | * A quote from SPC-4, paragraph "7.5.10 Control mode page": | |
241 | * "A task aborted status (TAS) bit set to zero specifies that | |
242 | * aborted commands shall be terminated by the device server | |
243 | * without any response to the application client. A TAS bit set | |
244 | * to one specifies that commands aborted by the actions of an I_T | |
245 | * nexus other than the I_T nexus on which the command was | |
246 | * received shall be completed with TASK ABORTED status." | |
247 | * @preempt_and_abort_list: For the PREEMPT AND ABORT functionality, a list | |
248 | * with registrations that will be preempted. | |
249 | */ | |
cf572a96 | 250 | static void core_tmr_drain_state_list( |
d050ffb9 NB |
251 | struct se_device *dev, |
252 | struct se_cmd *prout_cmd, | |
ebde1ca5 | 253 | struct se_session *tmr_sess, |
d050ffb9 NB |
254 | int tas, |
255 | struct list_head *preempt_and_abort_list) | |
256 | { | |
257 | LIST_HEAD(drain_task_list); | |
febe562c | 258 | struct se_session *sess; |
cf572a96 | 259 | struct se_cmd *cmd, *next; |
d050ffb9 | 260 | unsigned long flags; |
febe562c | 261 | int rc; |
cf572a96 | 262 | |
c66ac9db | 263 | /* |
cf572a96 CH |
264 | * Complete outstanding commands with TASK_ABORTED SAM status. |
265 | * | |
c66ac9db NB |
266 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
267 | * for TMR LUN_RESET: | |
268 | * | |
269 | * a) "Yes" indicates that each command that is aborted on an I_T nexus | |
270 | * other than the one that caused the SCSI device condition is | |
271 | * completed with TASK ABORTED status, if the TAS bit is set to one in | |
272 | * the Control mode page (see SPC-4). "No" indicates that no status is | |
273 | * returned for aborted commands. | |
274 | * | |
275 | * d) If the logical unit reset is caused by a particular I_T nexus | |
276 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" | |
277 | * (TASK_ABORTED status) applies. | |
278 | * | |
279 | * Otherwise (e.g., if triggered by a hard reset), "no" | |
280 | * (no TASK_ABORTED SAM status) applies. | |
281 | * | |
282 | * Note that this seems to be independent of TAS (Task Aborted Status) | |
283 | * in the Control Mode Page. | |
284 | */ | |
285 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 286 | list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { |
c66ac9db NB |
287 | /* |
288 | * For PREEMPT_AND_ABORT usage, only process commands | |
289 | * with a matching reservation key. | |
290 | */ | |
feae8564 | 291 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
c66ac9db | 292 | continue; |
cf572a96 | 293 | |
c66ac9db NB |
294 | /* |
295 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | |
296 | */ | |
297 | if (prout_cmd == cmd) | |
298 | continue; | |
299 | ||
febe562c NB |
300 | sess = cmd->se_sess; |
301 | if (WARN_ON_ONCE(!sess)) | |
302 | continue; | |
303 | ||
304 | spin_lock(&sess->sess_cmd_lock); | |
0f4a9431 | 305 | rc = __target_check_io_state(cmd, tmr_sess, tas); |
febe562c NB |
306 | spin_unlock(&sess->sess_cmd_lock); |
307 | if (!rc) | |
308 | continue; | |
309 | ||
cf572a96 CH |
310 | list_move_tail(&cmd->state_list, &drain_task_list); |
311 | cmd->state_active = false; | |
d050ffb9 NB |
312 | } |
313 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
314 | ||
315 | while (!list_empty(&drain_task_list)) { | |
cf572a96 | 316 | cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); |
febe562c | 317 | list_del_init(&cmd->state_list); |
c66ac9db | 318 | |
c00e6220 BVA |
319 | target_show_cmd("LUN_RESET: ", cmd); |
320 | pr_debug("LUN_RESET: ITT[0x%08llx] - %s pr_res_key: 0x%016Lx\n", | |
321 | cmd->tag, (preempt_and_abort_list) ? "preempt" : "", | |
322 | cmd->pr_res_key); | |
c66ac9db | 323 | |
2c9fa49e | 324 | target_put_cmd_and_wait(cmd); |
c66ac9db | 325 | } |
d050ffb9 NB |
326 | } |
327 | ||
d050ffb9 NB |
328 | int core_tmr_lun_reset( |
329 | struct se_device *dev, | |
330 | struct se_tmr_req *tmr, | |
331 | struct list_head *preempt_and_abort_list, | |
332 | struct se_cmd *prout_cmd) | |
333 | { | |
334 | struct se_node_acl *tmr_nacl = NULL; | |
335 | struct se_portal_group *tmr_tpg = NULL; | |
ebde1ca5 | 336 | struct se_session *tmr_sess = NULL; |
d050ffb9 NB |
337 | int tas; |
338 | /* | |
339 | * TASK_ABORTED status bit, this is configurable via ConfigFS | |
340 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page | |
341 | * | |
342 | * A task aborted status (TAS) bit set to zero specifies that aborted | |
343 | * tasks shall be terminated by the device server without any response | |
344 | * to the application client. A TAS bit set to one specifies that tasks | |
345 | * aborted by the actions of an I_T nexus other than the I_T nexus on | |
346 | * which the command was received shall be completed with TASK ABORTED | |
347 | * status (see SAM-4). | |
348 | */ | |
0fd97ccf | 349 | tas = dev->dev_attrib.emulate_tas; |
d050ffb9 NB |
350 | /* |
351 | * Determine if this se_tmr is coming from a $FABRIC_MOD | |
352 | * or struct se_device passthrough.. | |
353 | */ | |
354 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { | |
ebde1ca5 NB |
355 | tmr_sess = tmr->task_cmd->se_sess; |
356 | tmr_nacl = tmr_sess->se_node_acl; | |
357 | tmr_tpg = tmr_sess->se_tpg; | |
d050ffb9 NB |
358 | if (tmr_nacl && tmr_tpg) { |
359 | pr_debug("LUN_RESET: TMR caller fabric: %s" | |
360 | " initiator port %s\n", | |
30c7ca93 | 361 | tmr_tpg->se_tpg_tfo->fabric_name, |
d050ffb9 NB |
362 | tmr_nacl->initiatorname); |
363 | } | |
364 | } | |
365 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", | |
366 | (preempt_and_abort_list) ? "Preempt" : "TMR", | |
367 | dev->transport->name, tas); | |
368 | ||
369 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); | |
ebde1ca5 | 370 | core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas, |
d050ffb9 | 371 | preempt_and_abort_list); |
af877292 | 372 | |
c66ac9db NB |
373 | /* |
374 | * Clear any legacy SPC-2 reservation when called during | |
375 | * LOGICAL UNIT RESET | |
376 | */ | |
6708bb27 | 377 | if (!preempt_and_abort_list && |
0fd97ccf | 378 | (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { |
c66ac9db | 379 | spin_lock(&dev->dev_reservation_lock); |
fae43461 | 380 | dev->reservation_holder = NULL; |
0fd97ccf | 381 | dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
c66ac9db | 382 | spin_unlock(&dev->dev_reservation_lock); |
6708bb27 | 383 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
c66ac9db NB |
384 | } |
385 | ||
ee480683 | 386 | atomic_long_inc(&dev->num_resets); |
c66ac9db | 387 | |
6708bb27 | 388 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
c66ac9db | 389 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
e3d6f909 | 390 | dev->transport->name); |
c66ac9db NB |
391 | return 0; |
392 | } | |
d050ffb9 | 393 |