]>
Commit | Line | Data |
---|---|---|
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 NB |
33 | #include <target/target_core_configfs.h> |
34 | ||
e26d99ae | 35 | #include "target_core_internal.h" |
c66ac9db | 36 | #include "target_core_alua.h" |
c66ac9db NB |
37 | #include "target_core_pr.h" |
38 | #include "target_core_ua.h" | |
39 | ||
de103c93 CH |
40 | sense_reason_t |
41 | target_scsi3_ua_check(struct se_cmd *cmd) | |
c66ac9db NB |
42 | { |
43 | struct se_dev_entry *deve; | |
44 | struct se_session *sess = cmd->se_sess; | |
45 | struct se_node_acl *nacl; | |
46 | ||
6708bb27 | 47 | if (!sess) |
c66ac9db NB |
48 | return 0; |
49 | ||
50 | nacl = sess->se_node_acl; | |
6708bb27 | 51 | if (!nacl) |
c66ac9db NB |
52 | return 0; |
53 | ||
f2083241 | 54 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 55 | if (!atomic_read(&deve->ua_count)) |
c66ac9db NB |
56 | return 0; |
57 | /* | |
58 | * From sam4r14, section 5.14 Unit attention condition: | |
59 | * | |
60 | * a) if an INQUIRY command enters the enabled command state, the | |
61 | * device server shall process the INQUIRY command and shall neither | |
62 | * report nor clear any unit attention condition; | |
63 | * b) if a REPORT LUNS command enters the enabled command state, the | |
64 | * device server shall process the REPORT LUNS command and shall not | |
65 | * report any unit attention condition; | |
66 | * e) if a REQUEST SENSE command enters the enabled command state while | |
67 | * a unit attention condition exists for the SCSI initiator port | |
68 | * associated with the I_T nexus on which the REQUEST SENSE command | |
69 | * was received, then the device server shall process the command | |
70 | * and either: | |
71 | */ | |
de103c93 | 72 | switch (cmd->t_task_cdb[0]) { |
c66ac9db NB |
73 | case INQUIRY: |
74 | case REPORT_LUNS: | |
75 | case REQUEST_SENSE: | |
76 | return 0; | |
77 | default: | |
de103c93 | 78 | return TCM_CHECK_CONDITION_UNIT_ATTENTION; |
c66ac9db | 79 | } |
c66ac9db NB |
80 | } |
81 | ||
82 | int core_scsi3_ua_allocate( | |
83 | struct se_node_acl *nacl, | |
84 | u32 unpacked_lun, | |
85 | u8 asc, | |
86 | u8 ascq) | |
87 | { | |
88 | struct se_dev_entry *deve; | |
89 | struct se_ua *ua, *ua_p, *ua_tmp; | |
90 | /* | |
91 | * PASSTHROUGH OPS | |
92 | */ | |
6708bb27 | 93 | if (!nacl) |
e3d6f909 | 94 | return -EINVAL; |
c66ac9db NB |
95 | |
96 | ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC); | |
6708bb27 AG |
97 | if (!ua) { |
98 | pr_err("Unable to allocate struct se_ua\n"); | |
e3d6f909 | 99 | return -ENOMEM; |
c66ac9db | 100 | } |
c66ac9db NB |
101 | INIT_LIST_HEAD(&ua->ua_nacl_list); |
102 | ||
103 | ua->ua_nacl = nacl; | |
104 | ua->ua_asc = asc; | |
105 | ua->ua_ascq = ascq; | |
106 | ||
107 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 108 | deve = nacl->device_list[unpacked_lun]; |
c66ac9db NB |
109 | |
110 | spin_lock(&deve->ua_lock); | |
111 | list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) { | |
112 | /* | |
113 | * Do not report the same UNIT ATTENTION twice.. | |
114 | */ | |
115 | if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) { | |
116 | spin_unlock(&deve->ua_lock); | |
117 | spin_unlock_irq(&nacl->device_list_lock); | |
118 | kmem_cache_free(se_ua_cache, ua); | |
119 | return 0; | |
120 | } | |
121 | /* | |
122 | * Attach the highest priority Unit Attention to | |
123 | * the head of the list following sam4r14, | |
124 | * Section 5.14 Unit Attention Condition: | |
125 | * | |
126 | * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest | |
127 | * POWER ON OCCURRED or | |
128 | * DEVICE INTERNAL RESET | |
129 | * SCSI BUS RESET OCCURRED or | |
130 | * MICROCODE HAS BEEN CHANGED or | |
131 | * protocol specific | |
132 | * BUS DEVICE RESET FUNCTION OCCURRED | |
133 | * I_T NEXUS LOSS OCCURRED | |
134 | * COMMANDS CLEARED BY POWER LOSS NOTIFICATION | |
135 | * all others Lowest | |
136 | * | |
137 | * Each of the ASCQ codes listed above are defined in | |
138 | * the 29h ASC family, see spc4r17 Table D.1 | |
139 | */ | |
140 | if (ua_p->ua_asc == 0x29) { | |
141 | if ((asc == 0x29) && (ascq > ua_p->ua_ascq)) | |
142 | list_add(&ua->ua_nacl_list, | |
143 | &deve->ua_list); | |
144 | else | |
145 | list_add_tail(&ua->ua_nacl_list, | |
146 | &deve->ua_list); | |
147 | } else if (ua_p->ua_asc == 0x2a) { | |
148 | /* | |
149 | * Incoming Family 29h ASCQ codes will override | |
150 | * Family 2AHh ASCQ codes for Unit Attention condition. | |
151 | */ | |
152 | if ((asc == 0x29) || (ascq > ua_p->ua_asc)) | |
153 | list_add(&ua->ua_nacl_list, | |
154 | &deve->ua_list); | |
155 | else | |
156 | list_add_tail(&ua->ua_nacl_list, | |
157 | &deve->ua_list); | |
158 | } else | |
159 | list_add_tail(&ua->ua_nacl_list, | |
160 | &deve->ua_list); | |
161 | spin_unlock(&deve->ua_lock); | |
162 | spin_unlock_irq(&nacl->device_list_lock); | |
163 | ||
164 | atomic_inc(&deve->ua_count); | |
4e857c58 | 165 | smp_mb__after_atomic(); |
c66ac9db NB |
166 | return 0; |
167 | } | |
168 | list_add_tail(&ua->ua_nacl_list, &deve->ua_list); | |
169 | spin_unlock(&deve->ua_lock); | |
170 | spin_unlock_irq(&nacl->device_list_lock); | |
171 | ||
6708bb27 | 172 | pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:" |
c66ac9db | 173 | " 0x%02x, ASCQ: 0x%02x\n", |
e3d6f909 | 174 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
c66ac9db NB |
175 | asc, ascq); |
176 | ||
177 | atomic_inc(&deve->ua_count); | |
4e857c58 | 178 | smp_mb__after_atomic(); |
c66ac9db NB |
179 | return 0; |
180 | } | |
181 | ||
182 | void core_scsi3_ua_release_all( | |
183 | struct se_dev_entry *deve) | |
184 | { | |
185 | struct se_ua *ua, *ua_p; | |
186 | ||
187 | spin_lock(&deve->ua_lock); | |
188 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
189 | list_del(&ua->ua_nacl_list); | |
190 | kmem_cache_free(se_ua_cache, ua); | |
191 | ||
192 | atomic_dec(&deve->ua_count); | |
4e857c58 | 193 | smp_mb__after_atomic(); |
c66ac9db NB |
194 | } |
195 | spin_unlock(&deve->ua_lock); | |
196 | } | |
197 | ||
198 | void core_scsi3_ua_for_check_condition( | |
199 | struct se_cmd *cmd, | |
200 | u8 *asc, | |
201 | u8 *ascq) | |
202 | { | |
5951146d | 203 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
204 | struct se_dev_entry *deve; |
205 | struct se_session *sess = cmd->se_sess; | |
206 | struct se_node_acl *nacl; | |
207 | struct se_ua *ua = NULL, *ua_p; | |
208 | int head = 1; | |
209 | ||
6708bb27 | 210 | if (!sess) |
c66ac9db NB |
211 | return; |
212 | ||
213 | nacl = sess->se_node_acl; | |
6708bb27 | 214 | if (!nacl) |
c66ac9db NB |
215 | return; |
216 | ||
217 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 218 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 219 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db NB |
220 | spin_unlock_irq(&nacl->device_list_lock); |
221 | return; | |
222 | } | |
223 | /* | |
224 | * The highest priority Unit Attentions are placed at the head of the | |
225 | * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION + | |
226 | * sense data for the received CDB. | |
227 | */ | |
228 | spin_lock(&deve->ua_lock); | |
229 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
230 | /* | |
231 | * For ua_intlck_ctrl code not equal to 00b, only report the | |
232 | * highest priority UNIT_ATTENTION and ASC/ASCQ without | |
233 | * clearing it. | |
234 | */ | |
0fd97ccf | 235 | if (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) { |
c66ac9db NB |
236 | *asc = ua->ua_asc; |
237 | *ascq = ua->ua_ascq; | |
238 | break; | |
239 | } | |
240 | /* | |
241 | * Otherwise for the default 00b, release the UNIT ATTENTION | |
25985edc | 242 | * condition. Return the ASC/ASCQ of the highest priority UA |
c66ac9db NB |
243 | * (head of the list) in the outgoing CHECK_CONDITION + sense. |
244 | */ | |
245 | if (head) { | |
246 | *asc = ua->ua_asc; | |
247 | *ascq = ua->ua_ascq; | |
248 | head = 0; | |
249 | } | |
250 | list_del(&ua->ua_nacl_list); | |
251 | kmem_cache_free(se_ua_cache, ua); | |
252 | ||
253 | atomic_dec(&deve->ua_count); | |
4e857c58 | 254 | smp_mb__after_atomic(); |
c66ac9db NB |
255 | } |
256 | spin_unlock(&deve->ua_lock); | |
257 | spin_unlock_irq(&nacl->device_list_lock); | |
258 | ||
6708bb27 | 259 | pr_debug("[%s]: %s UNIT ATTENTION condition with" |
c66ac9db NB |
260 | " INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x" |
261 | " reported ASC: 0x%02x, ASCQ: 0x%02x\n", | |
e3d6f909 | 262 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
0fd97ccf CH |
263 | (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" : |
264 | "Releasing", dev->dev_attrib.emulate_ua_intlck_ctrl, | |
a1d8b49a | 265 | cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq); |
c66ac9db NB |
266 | } |
267 | ||
268 | int core_scsi3_ua_clear_for_request_sense( | |
269 | struct se_cmd *cmd, | |
270 | u8 *asc, | |
271 | u8 *ascq) | |
272 | { | |
273 | struct se_dev_entry *deve; | |
274 | struct se_session *sess = cmd->se_sess; | |
275 | struct se_node_acl *nacl; | |
276 | struct se_ua *ua = NULL, *ua_p; | |
277 | int head = 1; | |
278 | ||
6708bb27 | 279 | if (!sess) |
e3d6f909 | 280 | return -EINVAL; |
c66ac9db NB |
281 | |
282 | nacl = sess->se_node_acl; | |
6708bb27 | 283 | if (!nacl) |
e3d6f909 | 284 | return -EINVAL; |
c66ac9db NB |
285 | |
286 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 287 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 288 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db | 289 | spin_unlock_irq(&nacl->device_list_lock); |
e3d6f909 | 290 | return -EPERM; |
c66ac9db NB |
291 | } |
292 | /* | |
293 | * The highest priority Unit Attentions are placed at the head of the | |
294 | * struct se_dev_entry->ua_list. The First (and hence highest priority) | |
295 | * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the | |
296 | * matching struct se_lun. | |
297 | * | |
298 | * Once the returning ASC/ASCQ values are set, we go ahead and | |
25985edc | 299 | * release all of the Unit Attention conditions for the associated |
c66ac9db NB |
300 | * struct se_lun. |
301 | */ | |
302 | spin_lock(&deve->ua_lock); | |
303 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
304 | if (head) { | |
305 | *asc = ua->ua_asc; | |
306 | *ascq = ua->ua_ascq; | |
307 | head = 0; | |
308 | } | |
309 | list_del(&ua->ua_nacl_list); | |
310 | kmem_cache_free(se_ua_cache, ua); | |
311 | ||
312 | atomic_dec(&deve->ua_count); | |
4e857c58 | 313 | smp_mb__after_atomic(); |
c66ac9db NB |
314 | } |
315 | spin_unlock(&deve->ua_lock); | |
316 | spin_unlock_irq(&nacl->device_list_lock); | |
317 | ||
6708bb27 | 318 | pr_debug("[%s]: Released UNIT ATTENTION condition, mapped" |
c66ac9db | 319 | " LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x," |
e3d6f909 | 320 | " ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
321 | cmd->orig_fe_lun, *asc, *ascq); |
322 | ||
e3d6f909 | 323 | return (head) ? -EPERM : 0; |
c66ac9db | 324 | } |