Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_ua.c | |
3 | * | |
4 | * This file contains logic for SPC-3 Unit Attention emulation | |
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 <scsi/scsi.h> | |
29 | #include <scsi/scsi_cmnd.h> | |
30 | ||
31 | #include <target/target_core_base.h> | |
c4795fb2 | 32 | #include <target/target_core_fabric.h> |
c66ac9db | 33 | |
e26d99ae | 34 | #include "target_core_internal.h" |
c66ac9db | 35 | #include "target_core_alua.h" |
c66ac9db NB |
36 | #include "target_core_pr.h" |
37 | #include "target_core_ua.h" | |
38 | ||
de103c93 CH |
39 | sense_reason_t |
40 | target_scsi3_ua_check(struct se_cmd *cmd) | |
c66ac9db NB |
41 | { |
42 | struct se_dev_entry *deve; | |
43 | struct se_session *sess = cmd->se_sess; | |
44 | struct se_node_acl *nacl; | |
45 | ||
6708bb27 | 46 | if (!sess) |
c66ac9db NB |
47 | return 0; |
48 | ||
49 | nacl = sess->se_node_acl; | |
6708bb27 | 50 | if (!nacl) |
c66ac9db NB |
51 | return 0; |
52 | ||
29a05dee NB |
53 | rcu_read_lock(); |
54 | deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); | |
55 | if (!deve) { | |
56 | rcu_read_unlock(); | |
c66ac9db | 57 | return 0; |
29a05dee NB |
58 | } |
59 | if (!atomic_read(&deve->ua_count)) { | |
60 | rcu_read_unlock(); | |
61 | return 0; | |
62 | } | |
63 | rcu_read_unlock(); | |
c66ac9db NB |
64 | /* |
65 | * From sam4r14, section 5.14 Unit attention condition: | |
66 | * | |
67 | * a) if an INQUIRY command enters the enabled command state, the | |
68 | * device server shall process the INQUIRY command and shall neither | |
69 | * report nor clear any unit attention condition; | |
70 | * b) if a REPORT LUNS command enters the enabled command state, the | |
71 | * device server shall process the REPORT LUNS command and shall not | |
72 | * report any unit attention condition; | |
73 | * e) if a REQUEST SENSE command enters the enabled command state while | |
74 | * a unit attention condition exists for the SCSI initiator port | |
75 | * associated with the I_T nexus on which the REQUEST SENSE command | |
76 | * was received, then the device server shall process the command | |
77 | * and either: | |
78 | */ | |
de103c93 | 79 | switch (cmd->t_task_cdb[0]) { |
c66ac9db NB |
80 | case INQUIRY: |
81 | case REPORT_LUNS: | |
82 | case REQUEST_SENSE: | |
83 | return 0; | |
84 | default: | |
de103c93 | 85 | return TCM_CHECK_CONDITION_UNIT_ATTENTION; |
c66ac9db | 86 | } |
c66ac9db NB |
87 | } |
88 | ||
89 | int core_scsi3_ua_allocate( | |
90 | struct se_node_acl *nacl, | |
91 | u32 unpacked_lun, | |
92 | u8 asc, | |
93 | u8 ascq) | |
94 | { | |
95 | struct se_dev_entry *deve; | |
96 | struct se_ua *ua, *ua_p, *ua_tmp; | |
97 | /* | |
98 | * PASSTHROUGH OPS | |
99 | */ | |
6708bb27 | 100 | if (!nacl) |
e3d6f909 | 101 | return -EINVAL; |
c66ac9db NB |
102 | |
103 | ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC); | |
6708bb27 AG |
104 | if (!ua) { |
105 | pr_err("Unable to allocate struct se_ua\n"); | |
e3d6f909 | 106 | return -ENOMEM; |
c66ac9db | 107 | } |
c66ac9db NB |
108 | INIT_LIST_HEAD(&ua->ua_nacl_list); |
109 | ||
110 | ua->ua_nacl = nacl; | |
111 | ua->ua_asc = asc; | |
112 | ua->ua_ascq = ascq; | |
113 | ||
29a05dee NB |
114 | rcu_read_lock(); |
115 | deve = target_nacl_find_deve(nacl, unpacked_lun); | |
116 | if (!deve) { | |
117 | rcu_read_unlock(); | |
118 | return -EINVAL; | |
119 | } | |
c66ac9db NB |
120 | spin_lock(&deve->ua_lock); |
121 | list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) { | |
122 | /* | |
123 | * Do not report the same UNIT ATTENTION twice.. | |
124 | */ | |
125 | if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) { | |
126 | spin_unlock(&deve->ua_lock); | |
29a05dee | 127 | rcu_read_unlock(); |
c66ac9db NB |
128 | kmem_cache_free(se_ua_cache, ua); |
129 | return 0; | |
130 | } | |
131 | /* | |
132 | * Attach the highest priority Unit Attention to | |
133 | * the head of the list following sam4r14, | |
134 | * Section 5.14 Unit Attention Condition: | |
135 | * | |
136 | * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest | |
137 | * POWER ON OCCURRED or | |
138 | * DEVICE INTERNAL RESET | |
139 | * SCSI BUS RESET OCCURRED or | |
140 | * MICROCODE HAS BEEN CHANGED or | |
141 | * protocol specific | |
142 | * BUS DEVICE RESET FUNCTION OCCURRED | |
143 | * I_T NEXUS LOSS OCCURRED | |
144 | * COMMANDS CLEARED BY POWER LOSS NOTIFICATION | |
145 | * all others Lowest | |
146 | * | |
147 | * Each of the ASCQ codes listed above are defined in | |
148 | * the 29h ASC family, see spc4r17 Table D.1 | |
149 | */ | |
150 | if (ua_p->ua_asc == 0x29) { | |
151 | if ((asc == 0x29) && (ascq > ua_p->ua_ascq)) | |
152 | list_add(&ua->ua_nacl_list, | |
153 | &deve->ua_list); | |
154 | else | |
155 | list_add_tail(&ua->ua_nacl_list, | |
156 | &deve->ua_list); | |
157 | } else if (ua_p->ua_asc == 0x2a) { | |
158 | /* | |
159 | * Incoming Family 29h ASCQ codes will override | |
160 | * Family 2AHh ASCQ codes for Unit Attention condition. | |
161 | */ | |
162 | if ((asc == 0x29) || (ascq > ua_p->ua_asc)) | |
163 | list_add(&ua->ua_nacl_list, | |
164 | &deve->ua_list); | |
165 | else | |
166 | list_add_tail(&ua->ua_nacl_list, | |
167 | &deve->ua_list); | |
168 | } else | |
169 | list_add_tail(&ua->ua_nacl_list, | |
170 | &deve->ua_list); | |
171 | spin_unlock(&deve->ua_lock); | |
c66ac9db | 172 | |
33940d09 | 173 | atomic_inc_mb(&deve->ua_count); |
29a05dee | 174 | rcu_read_unlock(); |
c66ac9db NB |
175 | return 0; |
176 | } | |
177 | list_add_tail(&ua->ua_nacl_list, &deve->ua_list); | |
178 | spin_unlock(&deve->ua_lock); | |
c66ac9db | 179 | |
6708bb27 | 180 | pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:" |
c66ac9db | 181 | " 0x%02x, ASCQ: 0x%02x\n", |
e3d6f909 | 182 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
c66ac9db NB |
183 | asc, ascq); |
184 | ||
33940d09 | 185 | atomic_inc_mb(&deve->ua_count); |
29a05dee | 186 | rcu_read_unlock(); |
c66ac9db NB |
187 | return 0; |
188 | } | |
189 | ||
190 | void core_scsi3_ua_release_all( | |
191 | struct se_dev_entry *deve) | |
192 | { | |
193 | struct se_ua *ua, *ua_p; | |
194 | ||
195 | spin_lock(&deve->ua_lock); | |
196 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
197 | list_del(&ua->ua_nacl_list); | |
198 | kmem_cache_free(se_ua_cache, ua); | |
199 | ||
33940d09 | 200 | atomic_dec_mb(&deve->ua_count); |
c66ac9db NB |
201 | } |
202 | spin_unlock(&deve->ua_lock); | |
203 | } | |
204 | ||
205 | void core_scsi3_ua_for_check_condition( | |
206 | struct se_cmd *cmd, | |
207 | u8 *asc, | |
208 | u8 *ascq) | |
209 | { | |
5951146d | 210 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
211 | struct se_dev_entry *deve; |
212 | struct se_session *sess = cmd->se_sess; | |
213 | struct se_node_acl *nacl; | |
214 | struct se_ua *ua = NULL, *ua_p; | |
215 | int head = 1; | |
216 | ||
6708bb27 | 217 | if (!sess) |
c66ac9db NB |
218 | return; |
219 | ||
220 | nacl = sess->se_node_acl; | |
6708bb27 | 221 | if (!nacl) |
c66ac9db NB |
222 | return; |
223 | ||
29a05dee NB |
224 | rcu_read_lock(); |
225 | deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); | |
226 | if (!deve) { | |
227 | rcu_read_unlock(); | |
228 | return; | |
229 | } | |
6708bb27 | 230 | if (!atomic_read(&deve->ua_count)) { |
29a05dee | 231 | rcu_read_unlock(); |
c66ac9db NB |
232 | return; |
233 | } | |
234 | /* | |
235 | * The highest priority Unit Attentions are placed at the head of the | |
236 | * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION + | |
237 | * sense data for the received CDB. | |
238 | */ | |
239 | spin_lock(&deve->ua_lock); | |
240 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
241 | /* | |
242 | * For ua_intlck_ctrl code not equal to 00b, only report the | |
243 | * highest priority UNIT_ATTENTION and ASC/ASCQ without | |
244 | * clearing it. | |
245 | */ | |
0fd97ccf | 246 | if (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) { |
c66ac9db NB |
247 | *asc = ua->ua_asc; |
248 | *ascq = ua->ua_ascq; | |
249 | break; | |
250 | } | |
251 | /* | |
252 | * Otherwise for the default 00b, release the UNIT ATTENTION | |
25985edc | 253 | * condition. Return the ASC/ASCQ of the highest priority UA |
c66ac9db NB |
254 | * (head of the list) in the outgoing CHECK_CONDITION + sense. |
255 | */ | |
256 | if (head) { | |
257 | *asc = ua->ua_asc; | |
258 | *ascq = ua->ua_ascq; | |
259 | head = 0; | |
260 | } | |
261 | list_del(&ua->ua_nacl_list); | |
262 | kmem_cache_free(se_ua_cache, ua); | |
263 | ||
33940d09 | 264 | atomic_dec_mb(&deve->ua_count); |
c66ac9db NB |
265 | } |
266 | spin_unlock(&deve->ua_lock); | |
29a05dee | 267 | rcu_read_unlock(); |
c66ac9db | 268 | |
6708bb27 | 269 | pr_debug("[%s]: %s UNIT ATTENTION condition with" |
c66ac9db NB |
270 | " INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x" |
271 | " reported ASC: 0x%02x, ASCQ: 0x%02x\n", | |
e3d6f909 | 272 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
0fd97ccf CH |
273 | (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" : |
274 | "Releasing", dev->dev_attrib.emulate_ua_intlck_ctrl, | |
a1d8b49a | 275 | cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq); |
c66ac9db NB |
276 | } |
277 | ||
278 | int core_scsi3_ua_clear_for_request_sense( | |
279 | struct se_cmd *cmd, | |
280 | u8 *asc, | |
281 | u8 *ascq) | |
282 | { | |
283 | struct se_dev_entry *deve; | |
284 | struct se_session *sess = cmd->se_sess; | |
285 | struct se_node_acl *nacl; | |
286 | struct se_ua *ua = NULL, *ua_p; | |
287 | int head = 1; | |
288 | ||
6708bb27 | 289 | if (!sess) |
e3d6f909 | 290 | return -EINVAL; |
c66ac9db NB |
291 | |
292 | nacl = sess->se_node_acl; | |
6708bb27 | 293 | if (!nacl) |
e3d6f909 | 294 | return -EINVAL; |
c66ac9db | 295 | |
29a05dee NB |
296 | rcu_read_lock(); |
297 | deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); | |
298 | if (!deve) { | |
299 | rcu_read_unlock(); | |
300 | return -EINVAL; | |
301 | } | |
6708bb27 | 302 | if (!atomic_read(&deve->ua_count)) { |
29a05dee | 303 | rcu_read_unlock(); |
e3d6f909 | 304 | return -EPERM; |
c66ac9db NB |
305 | } |
306 | /* | |
307 | * The highest priority Unit Attentions are placed at the head of the | |
308 | * struct se_dev_entry->ua_list. The First (and hence highest priority) | |
309 | * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the | |
310 | * matching struct se_lun. | |
311 | * | |
312 | * Once the returning ASC/ASCQ values are set, we go ahead and | |
25985edc | 313 | * release all of the Unit Attention conditions for the associated |
c66ac9db NB |
314 | * struct se_lun. |
315 | */ | |
316 | spin_lock(&deve->ua_lock); | |
317 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
318 | if (head) { | |
319 | *asc = ua->ua_asc; | |
320 | *ascq = ua->ua_ascq; | |
321 | head = 0; | |
322 | } | |
323 | list_del(&ua->ua_nacl_list); | |
324 | kmem_cache_free(se_ua_cache, ua); | |
325 | ||
33940d09 | 326 | atomic_dec_mb(&deve->ua_count); |
c66ac9db NB |
327 | } |
328 | spin_unlock(&deve->ua_lock); | |
29a05dee | 329 | rcu_read_unlock(); |
c66ac9db | 330 | |
6708bb27 | 331 | pr_debug("[%s]: Released UNIT ATTENTION condition, mapped" |
c66ac9db | 332 | " LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x," |
e3d6f909 | 333 | " ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
334 | cmd->orig_fe_lun, *asc, *ascq); |
335 | ||
e3d6f909 | 336 | return (head) ? -EPERM : 0; |
c66ac9db | 337 | } |