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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 | * | |
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 | ||
c66ac9db NB |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> | |
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
31 | ||
32 | #include <target/target_core_base.h> | |
c4795fb2 | 33 | #include <target/target_core_fabric.h> |
c66ac9db NB |
34 | #include <target/target_core_configfs.h> |
35 | ||
e26d99ae | 36 | #include "target_core_internal.h" |
c66ac9db | 37 | #include "target_core_alua.h" |
c66ac9db NB |
38 | #include "target_core_pr.h" |
39 | #include "target_core_ua.h" | |
40 | ||
41 | int core_scsi3_ua_check( | |
42 | struct se_cmd *cmd, | |
43 | unsigned char *cdb) | |
44 | { | |
45 | struct se_dev_entry *deve; | |
46 | struct se_session *sess = cmd->se_sess; | |
47 | struct se_node_acl *nacl; | |
48 | ||
6708bb27 | 49 | if (!sess) |
c66ac9db NB |
50 | return 0; |
51 | ||
52 | nacl = sess->se_node_acl; | |
6708bb27 | 53 | if (!nacl) |
c66ac9db NB |
54 | return 0; |
55 | ||
f2083241 | 56 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 57 | if (!atomic_read(&deve->ua_count)) |
c66ac9db NB |
58 | return 0; |
59 | /* | |
60 | * From sam4r14, section 5.14 Unit attention condition: | |
61 | * | |
62 | * a) if an INQUIRY command enters the enabled command state, the | |
63 | * device server shall process the INQUIRY command and shall neither | |
64 | * report nor clear any unit attention condition; | |
65 | * b) if a REPORT LUNS command enters the enabled command state, the | |
66 | * device server shall process the REPORT LUNS command and shall not | |
67 | * report any unit attention condition; | |
68 | * e) if a REQUEST SENSE command enters the enabled command state while | |
69 | * a unit attention condition exists for the SCSI initiator port | |
70 | * associated with the I_T nexus on which the REQUEST SENSE command | |
71 | * was received, then the device server shall process the command | |
72 | * and either: | |
73 | */ | |
74 | switch (cdb[0]) { | |
75 | case INQUIRY: | |
76 | case REPORT_LUNS: | |
77 | case REQUEST_SENSE: | |
78 | return 0; | |
79 | default: | |
e3d6f909 | 80 | return -EINVAL; |
c66ac9db NB |
81 | } |
82 | ||
e3d6f909 | 83 | return -EINVAL; |
c66ac9db NB |
84 | } |
85 | ||
86 | int core_scsi3_ua_allocate( | |
87 | struct se_node_acl *nacl, | |
88 | u32 unpacked_lun, | |
89 | u8 asc, | |
90 | u8 ascq) | |
91 | { | |
92 | struct se_dev_entry *deve; | |
93 | struct se_ua *ua, *ua_p, *ua_tmp; | |
94 | /* | |
95 | * PASSTHROUGH OPS | |
96 | */ | |
6708bb27 | 97 | if (!nacl) |
e3d6f909 | 98 | return -EINVAL; |
c66ac9db NB |
99 | |
100 | ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC); | |
6708bb27 AG |
101 | if (!ua) { |
102 | pr_err("Unable to allocate struct se_ua\n"); | |
e3d6f909 | 103 | return -ENOMEM; |
c66ac9db NB |
104 | } |
105 | INIT_LIST_HEAD(&ua->ua_dev_list); | |
106 | INIT_LIST_HEAD(&ua->ua_nacl_list); | |
107 | ||
108 | ua->ua_nacl = nacl; | |
109 | ua->ua_asc = asc; | |
110 | ua->ua_ascq = ascq; | |
111 | ||
112 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 113 | deve = nacl->device_list[unpacked_lun]; |
c66ac9db NB |
114 | |
115 | spin_lock(&deve->ua_lock); | |
116 | list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) { | |
117 | /* | |
118 | * Do not report the same UNIT ATTENTION twice.. | |
119 | */ | |
120 | if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) { | |
121 | spin_unlock(&deve->ua_lock); | |
122 | spin_unlock_irq(&nacl->device_list_lock); | |
123 | kmem_cache_free(se_ua_cache, ua); | |
124 | return 0; | |
125 | } | |
126 | /* | |
127 | * Attach the highest priority Unit Attention to | |
128 | * the head of the list following sam4r14, | |
129 | * Section 5.14 Unit Attention Condition: | |
130 | * | |
131 | * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest | |
132 | * POWER ON OCCURRED or | |
133 | * DEVICE INTERNAL RESET | |
134 | * SCSI BUS RESET OCCURRED or | |
135 | * MICROCODE HAS BEEN CHANGED or | |
136 | * protocol specific | |
137 | * BUS DEVICE RESET FUNCTION OCCURRED | |
138 | * I_T NEXUS LOSS OCCURRED | |
139 | * COMMANDS CLEARED BY POWER LOSS NOTIFICATION | |
140 | * all others Lowest | |
141 | * | |
142 | * Each of the ASCQ codes listed above are defined in | |
143 | * the 29h ASC family, see spc4r17 Table D.1 | |
144 | */ | |
145 | if (ua_p->ua_asc == 0x29) { | |
146 | if ((asc == 0x29) && (ascq > ua_p->ua_ascq)) | |
147 | list_add(&ua->ua_nacl_list, | |
148 | &deve->ua_list); | |
149 | else | |
150 | list_add_tail(&ua->ua_nacl_list, | |
151 | &deve->ua_list); | |
152 | } else if (ua_p->ua_asc == 0x2a) { | |
153 | /* | |
154 | * Incoming Family 29h ASCQ codes will override | |
155 | * Family 2AHh ASCQ codes for Unit Attention condition. | |
156 | */ | |
157 | if ((asc == 0x29) || (ascq > ua_p->ua_asc)) | |
158 | list_add(&ua->ua_nacl_list, | |
159 | &deve->ua_list); | |
160 | else | |
161 | list_add_tail(&ua->ua_nacl_list, | |
162 | &deve->ua_list); | |
163 | } else | |
164 | list_add_tail(&ua->ua_nacl_list, | |
165 | &deve->ua_list); | |
166 | spin_unlock(&deve->ua_lock); | |
167 | spin_unlock_irq(&nacl->device_list_lock); | |
168 | ||
169 | atomic_inc(&deve->ua_count); | |
170 | smp_mb__after_atomic_inc(); | |
171 | return 0; | |
172 | } | |
173 | list_add_tail(&ua->ua_nacl_list, &deve->ua_list); | |
174 | spin_unlock(&deve->ua_lock); | |
175 | spin_unlock_irq(&nacl->device_list_lock); | |
176 | ||
6708bb27 | 177 | pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:" |
c66ac9db | 178 | " 0x%02x, ASCQ: 0x%02x\n", |
e3d6f909 | 179 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
c66ac9db NB |
180 | asc, ascq); |
181 | ||
182 | atomic_inc(&deve->ua_count); | |
183 | smp_mb__after_atomic_inc(); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | void core_scsi3_ua_release_all( | |
188 | struct se_dev_entry *deve) | |
189 | { | |
190 | struct se_ua *ua, *ua_p; | |
191 | ||
192 | spin_lock(&deve->ua_lock); | |
193 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
194 | list_del(&ua->ua_nacl_list); | |
195 | kmem_cache_free(se_ua_cache, ua); | |
196 | ||
197 | atomic_dec(&deve->ua_count); | |
198 | smp_mb__after_atomic_dec(); | |
199 | } | |
200 | spin_unlock(&deve->ua_lock); | |
201 | } | |
202 | ||
203 | void core_scsi3_ua_for_check_condition( | |
204 | struct se_cmd *cmd, | |
205 | u8 *asc, | |
206 | u8 *ascq) | |
207 | { | |
5951146d | 208 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
209 | struct se_dev_entry *deve; |
210 | struct se_session *sess = cmd->se_sess; | |
211 | struct se_node_acl *nacl; | |
212 | struct se_ua *ua = NULL, *ua_p; | |
213 | int head = 1; | |
214 | ||
6708bb27 | 215 | if (!sess) |
c66ac9db NB |
216 | return; |
217 | ||
218 | nacl = sess->se_node_acl; | |
6708bb27 | 219 | if (!nacl) |
c66ac9db NB |
220 | return; |
221 | ||
222 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 223 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 224 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db NB |
225 | spin_unlock_irq(&nacl->device_list_lock); |
226 | return; | |
227 | } | |
228 | /* | |
229 | * The highest priority Unit Attentions are placed at the head of the | |
230 | * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION + | |
231 | * sense data for the received CDB. | |
232 | */ | |
233 | spin_lock(&deve->ua_lock); | |
234 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
235 | /* | |
236 | * For ua_intlck_ctrl code not equal to 00b, only report the | |
237 | * highest priority UNIT_ATTENTION and ASC/ASCQ without | |
238 | * clearing it. | |
239 | */ | |
e3d6f909 | 240 | if (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl != 0) { |
c66ac9db NB |
241 | *asc = ua->ua_asc; |
242 | *ascq = ua->ua_ascq; | |
243 | break; | |
244 | } | |
245 | /* | |
246 | * Otherwise for the default 00b, release the UNIT ATTENTION | |
25985edc | 247 | * condition. Return the ASC/ASCQ of the highest priority UA |
c66ac9db NB |
248 | * (head of the list) in the outgoing CHECK_CONDITION + sense. |
249 | */ | |
250 | if (head) { | |
251 | *asc = ua->ua_asc; | |
252 | *ascq = ua->ua_ascq; | |
253 | head = 0; | |
254 | } | |
255 | list_del(&ua->ua_nacl_list); | |
256 | kmem_cache_free(se_ua_cache, ua); | |
257 | ||
258 | atomic_dec(&deve->ua_count); | |
259 | smp_mb__after_atomic_dec(); | |
260 | } | |
261 | spin_unlock(&deve->ua_lock); | |
262 | spin_unlock_irq(&nacl->device_list_lock); | |
263 | ||
6708bb27 | 264 | pr_debug("[%s]: %s UNIT ATTENTION condition with" |
c66ac9db NB |
265 | " INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x" |
266 | " reported ASC: 0x%02x, ASCQ: 0x%02x\n", | |
e3d6f909 AG |
267 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
268 | (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" : | |
269 | "Releasing", dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl, | |
a1d8b49a | 270 | cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq); |
c66ac9db NB |
271 | } |
272 | ||
273 | int core_scsi3_ua_clear_for_request_sense( | |
274 | struct se_cmd *cmd, | |
275 | u8 *asc, | |
276 | u8 *ascq) | |
277 | { | |
278 | struct se_dev_entry *deve; | |
279 | struct se_session *sess = cmd->se_sess; | |
280 | struct se_node_acl *nacl; | |
281 | struct se_ua *ua = NULL, *ua_p; | |
282 | int head = 1; | |
283 | ||
6708bb27 | 284 | if (!sess) |
e3d6f909 | 285 | return -EINVAL; |
c66ac9db NB |
286 | |
287 | nacl = sess->se_node_acl; | |
6708bb27 | 288 | if (!nacl) |
e3d6f909 | 289 | return -EINVAL; |
c66ac9db NB |
290 | |
291 | spin_lock_irq(&nacl->device_list_lock); | |
f2083241 | 292 | deve = nacl->device_list[cmd->orig_fe_lun]; |
6708bb27 | 293 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db | 294 | spin_unlock_irq(&nacl->device_list_lock); |
e3d6f909 | 295 | return -EPERM; |
c66ac9db NB |
296 | } |
297 | /* | |
298 | * The highest priority Unit Attentions are placed at the head of the | |
299 | * struct se_dev_entry->ua_list. The First (and hence highest priority) | |
300 | * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the | |
301 | * matching struct se_lun. | |
302 | * | |
303 | * Once the returning ASC/ASCQ values are set, we go ahead and | |
25985edc | 304 | * release all of the Unit Attention conditions for the associated |
c66ac9db NB |
305 | * struct se_lun. |
306 | */ | |
307 | spin_lock(&deve->ua_lock); | |
308 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
309 | if (head) { | |
310 | *asc = ua->ua_asc; | |
311 | *ascq = ua->ua_ascq; | |
312 | head = 0; | |
313 | } | |
314 | list_del(&ua->ua_nacl_list); | |
315 | kmem_cache_free(se_ua_cache, ua); | |
316 | ||
317 | atomic_dec(&deve->ua_count); | |
318 | smp_mb__after_atomic_dec(); | |
319 | } | |
320 | spin_unlock(&deve->ua_lock); | |
321 | spin_unlock_irq(&nacl->device_list_lock); | |
322 | ||
6708bb27 | 323 | pr_debug("[%s]: Released UNIT ATTENTION condition, mapped" |
c66ac9db | 324 | " LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x," |
e3d6f909 | 325 | " ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
326 | cmd->orig_fe_lun, *asc, *ascq); |
327 | ||
e3d6f909 | 328 | return (head) ? -EPERM : 0; |
c66ac9db | 329 | } |