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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> | |
33 | #include <target/target_core_device.h> | |
34 | #include <target/target_core_transport.h> | |
35 | #include <target/target_core_fabric_ops.h> | |
36 | #include <target/target_core_configfs.h> | |
37 | ||
38 | #include "target_core_alua.h" | |
39 | #include "target_core_hba.h" | |
40 | #include "target_core_pr.h" | |
41 | #include "target_core_ua.h" | |
42 | ||
43 | int core_scsi3_ua_check( | |
44 | struct se_cmd *cmd, | |
45 | unsigned char *cdb) | |
46 | { | |
47 | struct se_dev_entry *deve; | |
48 | struct se_session *sess = cmd->se_sess; | |
49 | struct se_node_acl *nacl; | |
50 | ||
6708bb27 | 51 | if (!sess) |
c66ac9db NB |
52 | return 0; |
53 | ||
54 | nacl = sess->se_node_acl; | |
6708bb27 | 55 | if (!nacl) |
c66ac9db NB |
56 | return 0; |
57 | ||
58 | deve = &nacl->device_list[cmd->orig_fe_lun]; | |
6708bb27 | 59 | if (!atomic_read(&deve->ua_count)) |
c66ac9db NB |
60 | return 0; |
61 | /* | |
62 | * From sam4r14, section 5.14 Unit attention condition: | |
63 | * | |
64 | * a) if an INQUIRY command enters the enabled command state, the | |
65 | * device server shall process the INQUIRY command and shall neither | |
66 | * report nor clear any unit attention condition; | |
67 | * b) if a REPORT LUNS command enters the enabled command state, the | |
68 | * device server shall process the REPORT LUNS command and shall not | |
69 | * report any unit attention condition; | |
70 | * e) if a REQUEST SENSE command enters the enabled command state while | |
71 | * a unit attention condition exists for the SCSI initiator port | |
72 | * associated with the I_T nexus on which the REQUEST SENSE command | |
73 | * was received, then the device server shall process the command | |
74 | * and either: | |
75 | */ | |
76 | switch (cdb[0]) { | |
77 | case INQUIRY: | |
78 | case REPORT_LUNS: | |
79 | case REQUEST_SENSE: | |
80 | return 0; | |
81 | default: | |
e3d6f909 | 82 | return -EINVAL; |
c66ac9db NB |
83 | } |
84 | ||
e3d6f909 | 85 | return -EINVAL; |
c66ac9db NB |
86 | } |
87 | ||
88 | int core_scsi3_ua_allocate( | |
89 | struct se_node_acl *nacl, | |
90 | u32 unpacked_lun, | |
91 | u8 asc, | |
92 | u8 ascq) | |
93 | { | |
94 | struct se_dev_entry *deve; | |
95 | struct se_ua *ua, *ua_p, *ua_tmp; | |
96 | /* | |
97 | * PASSTHROUGH OPS | |
98 | */ | |
6708bb27 | 99 | if (!nacl) |
e3d6f909 | 100 | return -EINVAL; |
c66ac9db NB |
101 | |
102 | ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC); | |
6708bb27 AG |
103 | if (!ua) { |
104 | pr_err("Unable to allocate struct se_ua\n"); | |
e3d6f909 | 105 | return -ENOMEM; |
c66ac9db NB |
106 | } |
107 | INIT_LIST_HEAD(&ua->ua_dev_list); | |
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 | ||
114 | spin_lock_irq(&nacl->device_list_lock); | |
115 | deve = &nacl->device_list[unpacked_lun]; | |
116 | ||
117 | spin_lock(&deve->ua_lock); | |
118 | list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) { | |
119 | /* | |
120 | * Do not report the same UNIT ATTENTION twice.. | |
121 | */ | |
122 | if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) { | |
123 | spin_unlock(&deve->ua_lock); | |
124 | spin_unlock_irq(&nacl->device_list_lock); | |
125 | kmem_cache_free(se_ua_cache, ua); | |
126 | return 0; | |
127 | } | |
128 | /* | |
129 | * Attach the highest priority Unit Attention to | |
130 | * the head of the list following sam4r14, | |
131 | * Section 5.14 Unit Attention Condition: | |
132 | * | |
133 | * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest | |
134 | * POWER ON OCCURRED or | |
135 | * DEVICE INTERNAL RESET | |
136 | * SCSI BUS RESET OCCURRED or | |
137 | * MICROCODE HAS BEEN CHANGED or | |
138 | * protocol specific | |
139 | * BUS DEVICE RESET FUNCTION OCCURRED | |
140 | * I_T NEXUS LOSS OCCURRED | |
141 | * COMMANDS CLEARED BY POWER LOSS NOTIFICATION | |
142 | * all others Lowest | |
143 | * | |
144 | * Each of the ASCQ codes listed above are defined in | |
145 | * the 29h ASC family, see spc4r17 Table D.1 | |
146 | */ | |
147 | if (ua_p->ua_asc == 0x29) { | |
148 | if ((asc == 0x29) && (ascq > ua_p->ua_ascq)) | |
149 | list_add(&ua->ua_nacl_list, | |
150 | &deve->ua_list); | |
151 | else | |
152 | list_add_tail(&ua->ua_nacl_list, | |
153 | &deve->ua_list); | |
154 | } else if (ua_p->ua_asc == 0x2a) { | |
155 | /* | |
156 | * Incoming Family 29h ASCQ codes will override | |
157 | * Family 2AHh ASCQ codes for Unit Attention condition. | |
158 | */ | |
159 | if ((asc == 0x29) || (ascq > ua_p->ua_asc)) | |
160 | list_add(&ua->ua_nacl_list, | |
161 | &deve->ua_list); | |
162 | else | |
163 | list_add_tail(&ua->ua_nacl_list, | |
164 | &deve->ua_list); | |
165 | } else | |
166 | list_add_tail(&ua->ua_nacl_list, | |
167 | &deve->ua_list); | |
168 | spin_unlock(&deve->ua_lock); | |
169 | spin_unlock_irq(&nacl->device_list_lock); | |
170 | ||
171 | atomic_inc(&deve->ua_count); | |
172 | smp_mb__after_atomic_inc(); | |
173 | return 0; | |
174 | } | |
175 | list_add_tail(&ua->ua_nacl_list, &deve->ua_list); | |
176 | spin_unlock(&deve->ua_lock); | |
177 | spin_unlock_irq(&nacl->device_list_lock); | |
178 | ||
6708bb27 | 179 | pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:" |
c66ac9db | 180 | " 0x%02x, ASCQ: 0x%02x\n", |
e3d6f909 | 181 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun, |
c66ac9db NB |
182 | asc, ascq); |
183 | ||
184 | atomic_inc(&deve->ua_count); | |
185 | smp_mb__after_atomic_inc(); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | void core_scsi3_ua_release_all( | |
190 | struct se_dev_entry *deve) | |
191 | { | |
192 | struct se_ua *ua, *ua_p; | |
193 | ||
194 | spin_lock(&deve->ua_lock); | |
195 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
196 | list_del(&ua->ua_nacl_list); | |
197 | kmem_cache_free(se_ua_cache, ua); | |
198 | ||
199 | atomic_dec(&deve->ua_count); | |
200 | smp_mb__after_atomic_dec(); | |
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 | ||
224 | spin_lock_irq(&nacl->device_list_lock); | |
225 | deve = &nacl->device_list[cmd->orig_fe_lun]; | |
6708bb27 | 226 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db NB |
227 | spin_unlock_irq(&nacl->device_list_lock); |
228 | return; | |
229 | } | |
230 | /* | |
231 | * The highest priority Unit Attentions are placed at the head of the | |
232 | * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION + | |
233 | * sense data for the received CDB. | |
234 | */ | |
235 | spin_lock(&deve->ua_lock); | |
236 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
237 | /* | |
238 | * For ua_intlck_ctrl code not equal to 00b, only report the | |
239 | * highest priority UNIT_ATTENTION and ASC/ASCQ without | |
240 | * clearing it. | |
241 | */ | |
e3d6f909 | 242 | if (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl != 0) { |
c66ac9db NB |
243 | *asc = ua->ua_asc; |
244 | *ascq = ua->ua_ascq; | |
245 | break; | |
246 | } | |
247 | /* | |
248 | * Otherwise for the default 00b, release the UNIT ATTENTION | |
25985edc | 249 | * condition. Return the ASC/ASCQ of the highest priority UA |
c66ac9db NB |
250 | * (head of the list) in the outgoing CHECK_CONDITION + sense. |
251 | */ | |
252 | if (head) { | |
253 | *asc = ua->ua_asc; | |
254 | *ascq = ua->ua_ascq; | |
255 | head = 0; | |
256 | } | |
257 | list_del(&ua->ua_nacl_list); | |
258 | kmem_cache_free(se_ua_cache, ua); | |
259 | ||
260 | atomic_dec(&deve->ua_count); | |
261 | smp_mb__after_atomic_dec(); | |
262 | } | |
263 | spin_unlock(&deve->ua_lock); | |
264 | spin_unlock_irq(&nacl->device_list_lock); | |
265 | ||
6708bb27 | 266 | pr_debug("[%s]: %s UNIT ATTENTION condition with" |
c66ac9db NB |
267 | " INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x" |
268 | " reported ASC: 0x%02x, ASCQ: 0x%02x\n", | |
e3d6f909 AG |
269 | nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
270 | (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" : | |
271 | "Releasing", dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl, | |
a1d8b49a | 272 | cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq); |
c66ac9db NB |
273 | } |
274 | ||
275 | int core_scsi3_ua_clear_for_request_sense( | |
276 | struct se_cmd *cmd, | |
277 | u8 *asc, | |
278 | u8 *ascq) | |
279 | { | |
280 | struct se_dev_entry *deve; | |
281 | struct se_session *sess = cmd->se_sess; | |
282 | struct se_node_acl *nacl; | |
283 | struct se_ua *ua = NULL, *ua_p; | |
284 | int head = 1; | |
285 | ||
6708bb27 | 286 | if (!sess) |
e3d6f909 | 287 | return -EINVAL; |
c66ac9db NB |
288 | |
289 | nacl = sess->se_node_acl; | |
6708bb27 | 290 | if (!nacl) |
e3d6f909 | 291 | return -EINVAL; |
c66ac9db NB |
292 | |
293 | spin_lock_irq(&nacl->device_list_lock); | |
294 | deve = &nacl->device_list[cmd->orig_fe_lun]; | |
6708bb27 | 295 | if (!atomic_read(&deve->ua_count)) { |
c66ac9db | 296 | spin_unlock_irq(&nacl->device_list_lock); |
e3d6f909 | 297 | return -EPERM; |
c66ac9db NB |
298 | } |
299 | /* | |
300 | * The highest priority Unit Attentions are placed at the head of the | |
301 | * struct se_dev_entry->ua_list. The First (and hence highest priority) | |
302 | * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the | |
303 | * matching struct se_lun. | |
304 | * | |
305 | * Once the returning ASC/ASCQ values are set, we go ahead and | |
25985edc | 306 | * release all of the Unit Attention conditions for the associated |
c66ac9db NB |
307 | * struct se_lun. |
308 | */ | |
309 | spin_lock(&deve->ua_lock); | |
310 | list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { | |
311 | if (head) { | |
312 | *asc = ua->ua_asc; | |
313 | *ascq = ua->ua_ascq; | |
314 | head = 0; | |
315 | } | |
316 | list_del(&ua->ua_nacl_list); | |
317 | kmem_cache_free(se_ua_cache, ua); | |
318 | ||
319 | atomic_dec(&deve->ua_count); | |
320 | smp_mb__after_atomic_dec(); | |
321 | } | |
322 | spin_unlock(&deve->ua_lock); | |
323 | spin_unlock_irq(&nacl->device_list_lock); | |
324 | ||
6708bb27 | 325 | pr_debug("[%s]: Released UNIT ATTENTION condition, mapped" |
c66ac9db | 326 | " LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x," |
e3d6f909 | 327 | " ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
328 | cmd->orig_fe_lun, *asc, *ascq); |
329 | ||
e3d6f909 | 330 | return (head) ? -EPERM : 0; |
c66ac9db | 331 | } |