diff options
author | Nicholas Bellinger <nab@linux-iscsi.org> | 2010-12-17 14:11:26 -0500 |
---|---|---|
committer | James Bottomley <James.Bottomley@suse.de> | 2011-01-14 11:12:29 -0500 |
commit | c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 (patch) | |
tree | 71c6344688bf56ea6aaf18c586ab69ff4f077ade /drivers/target/target_core_tmr.c | |
parent | f4013c3879d1bbd9f3ab8351185decd049502368 (diff) |
[SCSI] target: Add LIO target core v4.0.0-rc6
LIO target is a full featured in-kernel target framework with the
following feature set:
High-performance, non-blocking, multithreaded architecture with SIMD
support.
Advanced SCSI feature set:
* Persistent Reservations (PRs)
* Asymmetric Logical Unit Assignment (ALUA)
* Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
* Full Error Recovery (ERL=0,1,2)
* Active/active task migration and session continuation (ERL=2)
* Thin LUN provisioning (UNMAP and WRITE_SAMExx)
Multiprotocol target plugins
Storage media independence:
* Virtualization of all storage media; transparent mapping of IO to LUNs
* No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
* Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.
Standards compliance:
* Full compliance with IETF (RFC 3720)
* Full implementation of SPC-4 PRs and ALUA
Significant code cleanups done by Christoph Hellwig.
[jejb: fix up for new block bdev exclusive interface. Minor fixes from
Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/target/target_core_tmr.c')
-rw-r--r-- | drivers/target/target_core_tmr.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c new file mode 100644 index 000000000000..158cecbec718 --- /dev/null +++ b/drivers/target/target_core_tmr.c | |||
@@ -0,0 +1,404 @@ | |||
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); | ||
285 | } | ||
286 | __transport_stop_task_timer(task, &flags); | ||
287 | |||
288 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) { | ||
289 | spin_unlock_irqrestore( | ||
290 | &T_TASK(cmd)->t_state_lock, flags); | ||
291 | DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for" | ||
292 | " t_task_cdbs_ex_left: %d\n", task, dev, | ||
293 | atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left)); | ||
294 | |||
295 | spin_lock_irqsave(&dev->execute_task_lock, flags); | ||
296 | continue; | ||
297 | } | ||
298 | fe_count = atomic_read(&T_TASK(cmd)->t_fe_count); | ||
299 | |||
300 | if (atomic_read(&T_TASK(cmd)->t_transport_active)) { | ||
301 | DEBUG_LR("LUN_RESET: got t_transport_active = 1 for" | ||
302 | " task: %p, t_fe_count: %d dev: %p\n", task, | ||
303 | fe_count, dev); | ||
304 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, | ||
305 | flags); | ||
306 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); | ||
307 | |||
308 | spin_lock_irqsave(&dev->execute_task_lock, flags); | ||
309 | continue; | ||
310 | } | ||
311 | DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p," | ||
312 | " t_fe_count: %d dev: %p\n", task, fe_count, dev); | ||
313 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); | ||
314 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); | ||
315 | |||
316 | spin_lock_irqsave(&dev->execute_task_lock, flags); | ||
317 | } | ||
318 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | ||
319 | /* | ||
320 | * Release all commands remaining in the struct se_device cmd queue. | ||
321 | * | ||
322 | * This follows the same logic as above for the struct se_device | ||
323 | * struct se_task state list, where commands are returned with | ||
324 | * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD | ||
325 | * reference, otherwise the struct se_cmd is released. | ||
326 | */ | ||
327 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | ||
328 | list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) { | ||
329 | cmd = (struct se_cmd *)qr->cmd; | ||
330 | if (!(cmd)) { | ||
331 | /* | ||
332 | * Skip these for non PREEMPT_AND_ABORT usage.. | ||
333 | */ | ||
334 | if (preempt_and_abort_list != NULL) | ||
335 | continue; | ||
336 | |||
337 | atomic_dec(&qobj->queue_cnt); | ||
338 | list_del(&qr->qr_list); | ||
339 | kfree(qr); | ||
340 | continue; | ||
341 | } | ||
342 | /* | ||
343 | * For PREEMPT_AND_ABORT usage, only process commands | ||
344 | * with a matching reservation key. | ||
345 | */ | ||
346 | if ((preempt_and_abort_list != NULL) && | ||
347 | (core_scsi3_check_cdb_abort_and_preempt( | ||
348 | preempt_and_abort_list, cmd) != 0)) | ||
349 | continue; | ||
350 | /* | ||
351 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. | ||
352 | */ | ||
353 | if (prout_cmd == cmd) | ||
354 | continue; | ||
355 | |||
356 | atomic_dec(&T_TASK(cmd)->t_transport_queue_active); | ||
357 | atomic_dec(&qobj->queue_cnt); | ||
358 | list_del(&qr->qr_list); | ||
359 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | ||
360 | |||
361 | state = qr->state; | ||
362 | kfree(qr); | ||
363 | |||
364 | DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:" | ||
365 | " %d t_fe_count: %d\n", (preempt_and_abort_list) ? | ||
366 | "Preempt" : "", cmd, state, | ||
367 | atomic_read(&T_TASK(cmd)->t_fe_count)); | ||
368 | /* | ||
369 | * Signal that the command has failed via cmd->se_cmd_flags, | ||
370 | * and call TFO->new_cmd_failure() to wakeup any fabric | ||
371 | * dependent code used to wait for unsolicited data out | ||
372 | * allocation to complete. The fabric module is expected | ||
373 | * to dump any remaining unsolicited data out for the aborted | ||
374 | * command at this point. | ||
375 | */ | ||
376 | transport_new_cmd_failure(cmd); | ||
377 | |||
378 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, | ||
379 | atomic_read(&T_TASK(cmd)->t_fe_count)); | ||
380 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | ||
381 | } | ||
382 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | ||
383 | /* | ||
384 | * Clear any legacy SPC-2 reservation when called during | ||
385 | * LOGICAL UNIT RESET | ||
386 | */ | ||
387 | if (!(preempt_and_abort_list) && | ||
388 | (dev->dev_flags & DF_SPC2_RESERVATIONS)) { | ||
389 | spin_lock(&dev->dev_reservation_lock); | ||
390 | dev->dev_reserved_node_acl = NULL; | ||
391 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; | ||
392 | spin_unlock(&dev->dev_reservation_lock); | ||
393 | printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n"); | ||
394 | } | ||
395 | |||
396 | spin_lock(&dev->stats_lock); | ||
397 | dev->num_resets++; | ||
398 | spin_unlock(&dev->stats_lock); | ||
399 | |||
400 | DEBUG_LR("LUN_RESET: %s for [%s] Complete\n", | ||
401 | (preempt_and_abort_list) ? "Preempt" : "TMR", | ||
402 | TRANSPORT(dev)->name); | ||
403 | return 0; | ||
404 | } | ||