Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/net.h> |
30 | #include <linux/delay.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <linux/kthread.h> |
37 | #include <linux/in.h> | |
38 | #include <linux/cdrom.h> | |
39 | #include <asm/unaligned.h> | |
40 | #include <net/sock.h> | |
41 | #include <net/tcp.h> | |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 44 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
45 | |
46 | #include <target/target_core_base.h> | |
47 | #include <target/target_core_device.h> | |
48 | #include <target/target_core_tmr.h> | |
49 | #include <target/target_core_tpg.h> | |
50 | #include <target/target_core_transport.h> | |
51 | #include <target/target_core_fabric_ops.h> | |
52 | #include <target/target_core_configfs.h> | |
53 | ||
54 | #include "target_core_alua.h" | |
55 | #include "target_core_hba.h" | |
56 | #include "target_core_pr.h" | |
57 | #include "target_core_scdb.h" | |
58 | #include "target_core_ua.h" | |
59 | ||
e3d6f909 | 60 | static int sub_api_initialized; |
c66ac9db NB |
61 | |
62 | static struct kmem_cache *se_cmd_cache; | |
63 | static struct kmem_cache *se_sess_cache; | |
64 | struct kmem_cache *se_tmr_req_cache; | |
65 | struct kmem_cache *se_ua_cache; | |
c66ac9db NB |
66 | struct kmem_cache *t10_pr_reg_cache; |
67 | struct kmem_cache *t10_alua_lu_gp_cache; | |
68 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
69 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
70 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
71 | ||
c66ac9db | 72 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 73 | static int transport_processing_thread(void *param); |
c66ac9db NB |
74 | static int __transport_execute_tasks(struct se_device *dev); |
75 | static void transport_complete_task_attr(struct se_cmd *cmd); | |
07bde79a NB |
76 | static int transport_complete_qf(struct se_cmd *cmd); |
77 | static void transport_handle_queue_full(struct se_cmd *cmd, | |
78 | struct se_device *dev, int (*qf_callback)(struct se_cmd *)); | |
c66ac9db NB |
79 | static void transport_direct_request_timeout(struct se_cmd *cmd); |
80 | static void transport_free_dev_tasks(struct se_cmd *cmd); | |
a1d8b49a | 81 | static u32 transport_allocate_tasks(struct se_cmd *cmd, |
ec98f782 | 82 | unsigned long long starting_lba, |
c66ac9db | 83 | enum dma_data_direction data_direction, |
ec98f782 | 84 | struct scatterlist *sgl, unsigned int nents); |
05d1c7c0 | 85 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 86 | static void transport_put_cmd(struct se_cmd *cmd); |
c66ac9db NB |
87 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, |
88 | struct se_queue_obj *qobj); | |
89 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); | |
90 | static void transport_stop_all_task_timers(struct se_cmd *cmd); | |
91 | ||
e3d6f909 | 92 | int init_se_kmem_caches(void) |
c66ac9db | 93 | { |
c66ac9db NB |
94 | se_cmd_cache = kmem_cache_create("se_cmd_cache", |
95 | sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL); | |
6708bb27 AG |
96 | if (!se_cmd_cache) { |
97 | pr_err("kmem_cache_create for struct se_cmd failed\n"); | |
c66ac9db NB |
98 | goto out; |
99 | } | |
100 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", | |
101 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), | |
102 | 0, NULL); | |
6708bb27 AG |
103 | if (!se_tmr_req_cache) { |
104 | pr_err("kmem_cache_create() for struct se_tmr_req" | |
c66ac9db NB |
105 | " failed\n"); |
106 | goto out; | |
107 | } | |
108 | se_sess_cache = kmem_cache_create("se_sess_cache", | |
109 | sizeof(struct se_session), __alignof__(struct se_session), | |
110 | 0, NULL); | |
6708bb27 AG |
111 | if (!se_sess_cache) { |
112 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db NB |
113 | " failed\n"); |
114 | goto out; | |
115 | } | |
116 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
117 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
118 | 0, NULL); | |
6708bb27 AG |
119 | if (!se_ua_cache) { |
120 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
c66ac9db NB |
121 | goto out; |
122 | } | |
c66ac9db NB |
123 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
124 | sizeof(struct t10_pr_registration), | |
125 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
126 | if (!t10_pr_reg_cache) { |
127 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db NB |
128 | " failed\n"); |
129 | goto out; | |
130 | } | |
131 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
132 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
133 | 0, NULL); | |
6708bb27 AG |
134 | if (!t10_alua_lu_gp_cache) { |
135 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db NB |
136 | " failed\n"); |
137 | goto out; | |
138 | } | |
139 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
140 | sizeof(struct t10_alua_lu_gp_member), | |
141 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
142 | if (!t10_alua_lu_gp_mem_cache) { |
143 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db NB |
144 | "cache failed\n"); |
145 | goto out; | |
146 | } | |
147 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
148 | sizeof(struct t10_alua_tg_pt_gp), | |
149 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
150 | if (!t10_alua_tg_pt_gp_cache) { |
151 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
152 | "cache failed\n"); |
153 | goto out; | |
154 | } | |
155 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
156 | "t10_alua_tg_pt_gp_mem_cache", | |
157 | sizeof(struct t10_alua_tg_pt_gp_member), | |
158 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
159 | 0, NULL); | |
6708bb27 AG |
160 | if (!t10_alua_tg_pt_gp_mem_cache) { |
161 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
162 | "mem_t failed\n"); |
163 | goto out; | |
164 | } | |
165 | ||
c66ac9db NB |
166 | return 0; |
167 | out: | |
168 | if (se_cmd_cache) | |
169 | kmem_cache_destroy(se_cmd_cache); | |
170 | if (se_tmr_req_cache) | |
171 | kmem_cache_destroy(se_tmr_req_cache); | |
172 | if (se_sess_cache) | |
173 | kmem_cache_destroy(se_sess_cache); | |
174 | if (se_ua_cache) | |
175 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
176 | if (t10_pr_reg_cache) |
177 | kmem_cache_destroy(t10_pr_reg_cache); | |
178 | if (t10_alua_lu_gp_cache) | |
179 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
180 | if (t10_alua_lu_gp_mem_cache) | |
181 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
182 | if (t10_alua_tg_pt_gp_cache) | |
183 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
184 | if (t10_alua_tg_pt_gp_mem_cache) | |
185 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
e3d6f909 | 186 | return -ENOMEM; |
c66ac9db NB |
187 | } |
188 | ||
e3d6f909 | 189 | void release_se_kmem_caches(void) |
c66ac9db | 190 | { |
c66ac9db NB |
191 | kmem_cache_destroy(se_cmd_cache); |
192 | kmem_cache_destroy(se_tmr_req_cache); | |
193 | kmem_cache_destroy(se_sess_cache); | |
194 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
195 | kmem_cache_destroy(t10_pr_reg_cache); |
196 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
197 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
198 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
199 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
200 | } |
201 | ||
e3d6f909 AG |
202 | /* This code ensures unique mib indexes are handed out. */ |
203 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
204 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
205 | |
206 | /* | |
207 | * Allocate a new row index for the entry type specified | |
208 | */ | |
209 | u32 scsi_get_new_index(scsi_index_t type) | |
210 | { | |
211 | u32 new_index; | |
212 | ||
e3d6f909 | 213 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 214 | |
e3d6f909 AG |
215 | spin_lock(&scsi_mib_index_lock); |
216 | new_index = ++scsi_mib_index[type]; | |
217 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
218 | |
219 | return new_index; | |
220 | } | |
221 | ||
c66ac9db NB |
222 | void transport_init_queue_obj(struct se_queue_obj *qobj) |
223 | { | |
224 | atomic_set(&qobj->queue_cnt, 0); | |
225 | INIT_LIST_HEAD(&qobj->qobj_list); | |
226 | init_waitqueue_head(&qobj->thread_wq); | |
227 | spin_lock_init(&qobj->cmd_queue_lock); | |
228 | } | |
229 | EXPORT_SYMBOL(transport_init_queue_obj); | |
230 | ||
231 | static int transport_subsystem_reqmods(void) | |
232 | { | |
233 | int ret; | |
234 | ||
235 | ret = request_module("target_core_iblock"); | |
236 | if (ret != 0) | |
6708bb27 | 237 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
238 | |
239 | ret = request_module("target_core_file"); | |
240 | if (ret != 0) | |
6708bb27 | 241 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
242 | |
243 | ret = request_module("target_core_pscsi"); | |
244 | if (ret != 0) | |
6708bb27 | 245 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
246 | |
247 | ret = request_module("target_core_stgt"); | |
248 | if (ret != 0) | |
6708bb27 | 249 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db NB |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
254 | int transport_subsystem_check_init(void) | |
255 | { | |
e3d6f909 AG |
256 | int ret; |
257 | ||
258 | if (sub_api_initialized) | |
c66ac9db NB |
259 | return 0; |
260 | /* | |
261 | * Request the loading of known TCM subsystem plugins.. | |
262 | */ | |
e3d6f909 AG |
263 | ret = transport_subsystem_reqmods(); |
264 | if (ret < 0) | |
265 | return ret; | |
c66ac9db | 266 | |
e3d6f909 | 267 | sub_api_initialized = 1; |
c66ac9db NB |
268 | return 0; |
269 | } | |
270 | ||
271 | struct se_session *transport_init_session(void) | |
272 | { | |
273 | struct se_session *se_sess; | |
274 | ||
275 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
276 | if (!se_sess) { |
277 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
278 | " se_sess_cache\n"); |
279 | return ERR_PTR(-ENOMEM); | |
280 | } | |
281 | INIT_LIST_HEAD(&se_sess->sess_list); | |
282 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
c66ac9db NB |
283 | |
284 | return se_sess; | |
285 | } | |
286 | EXPORT_SYMBOL(transport_init_session); | |
287 | ||
288 | /* | |
289 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
290 | */ | |
291 | void __transport_register_session( | |
292 | struct se_portal_group *se_tpg, | |
293 | struct se_node_acl *se_nacl, | |
294 | struct se_session *se_sess, | |
295 | void *fabric_sess_ptr) | |
296 | { | |
297 | unsigned char buf[PR_REG_ISID_LEN]; | |
298 | ||
299 | se_sess->se_tpg = se_tpg; | |
300 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
301 | /* | |
302 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
303 | * | |
304 | * Only set for struct se_session's that will actually be moving I/O. | |
305 | * eg: *NOT* discovery sessions. | |
306 | */ | |
307 | if (se_nacl) { | |
308 | /* | |
309 | * If the fabric module supports an ISID based TransportID, | |
310 | * save this value in binary from the fabric I_T Nexus now. | |
311 | */ | |
e3d6f909 | 312 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 313 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 314 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
315 | &buf[0], PR_REG_ISID_LEN); |
316 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
317 | } | |
318 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
319 | /* | |
320 | * The se_nacl->nacl_sess pointer will be set to the | |
321 | * last active I_T Nexus for each struct se_node_acl. | |
322 | */ | |
323 | se_nacl->nacl_sess = se_sess; | |
324 | ||
325 | list_add_tail(&se_sess->sess_acl_list, | |
326 | &se_nacl->acl_sess_list); | |
327 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
328 | } | |
329 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
330 | ||
6708bb27 | 331 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 332 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
333 | } |
334 | EXPORT_SYMBOL(__transport_register_session); | |
335 | ||
336 | void transport_register_session( | |
337 | struct se_portal_group *se_tpg, | |
338 | struct se_node_acl *se_nacl, | |
339 | struct se_session *se_sess, | |
340 | void *fabric_sess_ptr) | |
341 | { | |
342 | spin_lock_bh(&se_tpg->session_lock); | |
343 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
344 | spin_unlock_bh(&se_tpg->session_lock); | |
345 | } | |
346 | EXPORT_SYMBOL(transport_register_session); | |
347 | ||
348 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
349 | { | |
350 | struct se_node_acl *se_nacl; | |
23388864 | 351 | unsigned long flags; |
c66ac9db NB |
352 | /* |
353 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
354 | */ | |
355 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 356 | if (se_nacl) { |
23388864 | 357 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
358 | list_del(&se_sess->sess_acl_list); |
359 | /* | |
360 | * If the session list is empty, then clear the pointer. | |
361 | * Otherwise, set the struct se_session pointer from the tail | |
362 | * element of the per struct se_node_acl active session list. | |
363 | */ | |
364 | if (list_empty(&se_nacl->acl_sess_list)) | |
365 | se_nacl->nacl_sess = NULL; | |
366 | else { | |
367 | se_nacl->nacl_sess = container_of( | |
368 | se_nacl->acl_sess_list.prev, | |
369 | struct se_session, sess_acl_list); | |
370 | } | |
23388864 | 371 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
372 | } |
373 | } | |
374 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
375 | ||
376 | void transport_free_session(struct se_session *se_sess) | |
377 | { | |
378 | kmem_cache_free(se_sess_cache, se_sess); | |
379 | } | |
380 | EXPORT_SYMBOL(transport_free_session); | |
381 | ||
382 | void transport_deregister_session(struct se_session *se_sess) | |
383 | { | |
384 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
385 | struct se_node_acl *se_nacl; | |
e63a8e19 | 386 | unsigned long flags; |
c66ac9db | 387 | |
6708bb27 | 388 | if (!se_tpg) { |
c66ac9db NB |
389 | transport_free_session(se_sess); |
390 | return; | |
391 | } | |
c66ac9db | 392 | |
e63a8e19 | 393 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
394 | list_del(&se_sess->sess_list); |
395 | se_sess->se_tpg = NULL; | |
396 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 397 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
398 | |
399 | /* | |
400 | * Determine if we need to do extra work for this initiator node's | |
401 | * struct se_node_acl if it had been previously dynamically generated. | |
402 | */ | |
403 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 404 | if (se_nacl) { |
e63a8e19 | 405 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 406 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
407 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
408 | se_tpg)) { | |
c66ac9db NB |
409 | list_del(&se_nacl->acl_list); |
410 | se_tpg->num_node_acls--; | |
e63a8e19 | 411 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
412 | |
413 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 414 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 415 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 416 | se_nacl); |
e63a8e19 | 417 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
418 | } |
419 | } | |
e63a8e19 | 420 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
421 | } |
422 | ||
423 | transport_free_session(se_sess); | |
424 | ||
6708bb27 | 425 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 426 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
427 | } |
428 | EXPORT_SYMBOL(transport_deregister_session); | |
429 | ||
430 | /* | |
a1d8b49a | 431 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
432 | */ |
433 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
434 | { | |
42bf829e | 435 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
436 | struct se_task *task; |
437 | unsigned long flags; | |
438 | ||
42bf829e CH |
439 | if (!dev) |
440 | return; | |
c66ac9db | 441 | |
42bf829e | 442 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 443 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
444 | continue; |
445 | ||
6708bb27 | 446 | if (!atomic_read(&task->task_state_active)) |
c66ac9db NB |
447 | continue; |
448 | ||
449 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
450 | list_del(&task->t_state_list); | |
6708bb27 AG |
451 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", |
452 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db NB |
453 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
454 | ||
455 | atomic_set(&task->task_state_active, 0); | |
a1d8b49a | 456 | atomic_dec(&cmd->t_task_cdbs_ex_left); |
c66ac9db NB |
457 | } |
458 | } | |
459 | ||
460 | /* transport_cmd_check_stop(): | |
461 | * | |
462 | * 'transport_off = 1' determines if t_transport_active should be cleared. | |
463 | * 'transport_off = 2' determines if task_dev_state should be removed. | |
464 | * | |
465 | * A non-zero u8 t_state sets cmd->t_state. | |
466 | * Returns 1 when command is stopped, else 0. | |
467 | */ | |
468 | static int transport_cmd_check_stop( | |
469 | struct se_cmd *cmd, | |
470 | int transport_off, | |
471 | u8 t_state) | |
472 | { | |
473 | unsigned long flags; | |
474 | ||
a1d8b49a | 475 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
476 | /* |
477 | * Determine if IOCTL context caller in requesting the stopping of this | |
478 | * command for LUN shutdown purposes. | |
479 | */ | |
a1d8b49a | 480 | if (atomic_read(&cmd->transport_lun_stop)) { |
6708bb27 | 481 | pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)" |
c66ac9db | 482 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 483 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
484 | |
485 | cmd->deferred_t_state = cmd->t_state; | |
486 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
a1d8b49a | 487 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
488 | if (transport_off == 2) |
489 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 490 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 491 | |
a1d8b49a | 492 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
493 | return 1; |
494 | } | |
495 | /* | |
496 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 497 | * this command for frontend exceptions. |
c66ac9db | 498 | */ |
a1d8b49a | 499 | if (atomic_read(&cmd->t_transport_stop)) { |
6708bb27 | 500 | pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) ==" |
c66ac9db | 501 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 502 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
503 | |
504 | cmd->deferred_t_state = cmd->t_state; | |
505 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
506 | if (transport_off == 2) | |
507 | transport_all_task_dev_remove_state(cmd); | |
508 | ||
509 | /* | |
510 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
511 | * to FE. | |
512 | */ | |
513 | if (transport_off == 2) | |
514 | cmd->se_lun = NULL; | |
a1d8b49a | 515 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 516 | |
a1d8b49a | 517 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
518 | return 1; |
519 | } | |
520 | if (transport_off) { | |
a1d8b49a | 521 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
522 | if (transport_off == 2) { |
523 | transport_all_task_dev_remove_state(cmd); | |
524 | /* | |
525 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
526 | * handoff to fabric module. | |
527 | */ | |
528 | cmd->se_lun = NULL; | |
529 | /* | |
530 | * Some fabric modules like tcm_loop can release | |
25985edc | 531 | * their internally allocated I/O reference now and |
c66ac9db NB |
532 | * struct se_cmd now. |
533 | */ | |
e3d6f909 | 534 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 535 | spin_unlock_irqrestore( |
a1d8b49a | 536 | &cmd->t_state_lock, flags); |
c66ac9db | 537 | |
e3d6f909 | 538 | cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
539 | return 1; |
540 | } | |
541 | } | |
a1d8b49a | 542 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
543 | |
544 | return 0; | |
545 | } else if (t_state) | |
546 | cmd->t_state = t_state; | |
a1d8b49a | 547 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
548 | |
549 | return 0; | |
550 | } | |
551 | ||
552 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
553 | { | |
554 | return transport_cmd_check_stop(cmd, 2, 0); | |
555 | } | |
556 | ||
557 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
558 | { | |
e3d6f909 | 559 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
560 | unsigned long flags; |
561 | ||
562 | if (!lun) | |
563 | return; | |
564 | ||
a1d8b49a | 565 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 566 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 567 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
568 | goto check_lun; |
569 | } | |
a1d8b49a | 570 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 571 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 572 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 573 | |
c66ac9db NB |
574 | |
575 | check_lun: | |
576 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); | |
a1d8b49a | 577 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 578 | list_del(&cmd->se_lun_node); |
a1d8b49a | 579 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 580 | #if 0 |
6708bb27 | 581 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 582 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
583 | #endif |
584 | } | |
585 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
586 | } | |
587 | ||
588 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
589 | { | |
8dc52b54 NB |
590 | if (!cmd->se_tmr_req) |
591 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
592 | |
593 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
594 | return; | |
77039d1e NB |
595 | if (remove) { |
596 | transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj); | |
e6a2573f | 597 | transport_put_cmd(cmd); |
77039d1e | 598 | } |
c66ac9db NB |
599 | } |
600 | ||
5951146d | 601 | static void transport_add_cmd_to_queue( |
c66ac9db NB |
602 | struct se_cmd *cmd, |
603 | int t_state) | |
604 | { | |
605 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 606 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
607 | unsigned long flags; |
608 | ||
c66ac9db | 609 | if (t_state) { |
a1d8b49a | 610 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 611 | cmd->t_state = t_state; |
a1d8b49a AG |
612 | atomic_set(&cmd->t_transport_active, 1); |
613 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
614 | } |
615 | ||
616 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
617 | |
618 | /* If the cmd is already on the list, remove it before we add it */ | |
619 | if (!list_empty(&cmd->se_queue_node)) | |
620 | list_del(&cmd->se_queue_node); | |
621 | else | |
622 | atomic_inc(&qobj->queue_cnt); | |
623 | ||
07bde79a NB |
624 | if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) { |
625 | cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL; | |
626 | list_add(&cmd->se_queue_node, &qobj->qobj_list); | |
627 | } else | |
628 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); | |
79a7fef2 | 629 | atomic_set(&cmd->t_transport_queue_active, 1); |
c66ac9db NB |
630 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
631 | ||
c66ac9db | 632 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
633 | } |
634 | ||
5951146d AG |
635 | static struct se_cmd * |
636 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 637 | { |
5951146d | 638 | struct se_cmd *cmd; |
c66ac9db NB |
639 | unsigned long flags; |
640 | ||
641 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
642 | if (list_empty(&qobj->qobj_list)) { | |
643 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
644 | return NULL; | |
645 | } | |
5951146d | 646 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 647 | |
79a7fef2 | 648 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 649 | |
79a7fef2 | 650 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
651 | atomic_dec(&qobj->queue_cnt); |
652 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
653 | ||
5951146d | 654 | return cmd; |
c66ac9db NB |
655 | } |
656 | ||
657 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, | |
658 | struct se_queue_obj *qobj) | |
659 | { | |
c66ac9db NB |
660 | unsigned long flags; |
661 | ||
662 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
6708bb27 | 663 | if (!atomic_read(&cmd->t_transport_queue_active)) { |
c66ac9db NB |
664 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
665 | return; | |
666 | } | |
79a7fef2 RD |
667 | atomic_set(&cmd->t_transport_queue_active, 0); |
668 | atomic_dec(&qobj->queue_cnt); | |
669 | list_del_init(&cmd->se_queue_node); | |
c66ac9db NB |
670 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
671 | ||
a1d8b49a | 672 | if (atomic_read(&cmd->t_transport_queue_active)) { |
6708bb27 | 673 | pr_err("ITT: 0x%08x t_transport_queue_active: %d\n", |
e3d6f909 | 674 | cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 675 | atomic_read(&cmd->t_transport_queue_active)); |
c66ac9db NB |
676 | } |
677 | } | |
678 | ||
679 | /* | |
680 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
681 | * for queueing up response from struct se_subsystem_api->do_task() | |
682 | */ | |
683 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
684 | { | |
a1d8b49a | 685 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
686 | struct se_task, t_list); |
687 | ||
688 | if (good) { | |
689 | cmd->scsi_status = SAM_STAT_GOOD; | |
690 | task->task_scsi_status = GOOD; | |
691 | } else { | |
692 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
693 | task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST; | |
e3d6f909 | 694 | task->task_se_cmd->transport_error_status = |
c66ac9db NB |
695 | PYX_TRANSPORT_ILLEGAL_REQUEST; |
696 | } | |
697 | ||
698 | transport_complete_task(task, good); | |
699 | } | |
700 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
701 | ||
702 | /* transport_complete_task(): | |
703 | * | |
704 | * Called from interrupt and non interrupt context depending | |
705 | * on the transport plugin. | |
706 | */ | |
707 | void transport_complete_task(struct se_task *task, int success) | |
708 | { | |
e3d6f909 | 709 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 710 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
711 | int t_state; |
712 | unsigned long flags; | |
713 | #if 0 | |
6708bb27 | 714 | pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task, |
a1d8b49a | 715 | cmd->t_task_cdb[0], dev); |
c66ac9db | 716 | #endif |
e3d6f909 | 717 | if (dev) |
c66ac9db | 718 | atomic_inc(&dev->depth_left); |
c66ac9db | 719 | |
a1d8b49a | 720 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 721 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
722 | |
723 | /* | |
724 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
725 | * Also check for any other post completion work that needs to be | |
726 | * done by the plugins. | |
727 | */ | |
728 | if (dev && dev->transport->transport_complete) { | |
729 | if (dev->transport->transport_complete(task) != 0) { | |
730 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
731 | task->task_sense = 1; | |
732 | success = 1; | |
733 | } | |
734 | } | |
735 | ||
736 | /* | |
737 | * See if we are waiting for outstanding struct se_task | |
738 | * to complete for an exception condition | |
739 | */ | |
6c76bf95 | 740 | if (task->task_flags & TF_REQUEST_STOP) { |
c66ac9db | 741 | /* |
a1d8b49a | 742 | * Decrement cmd->t_se_count if this task had |
c66ac9db NB |
743 | * previously thrown its timeout exception handler. |
744 | */ | |
6c76bf95 | 745 | if (task->task_flags & TF_TIMEOUT) { |
a1d8b49a | 746 | atomic_dec(&cmd->t_se_count); |
6c76bf95 | 747 | task->task_flags &= ~TF_TIMEOUT; |
c66ac9db | 748 | } |
a1d8b49a | 749 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
750 | |
751 | complete(&task->task_stop_comp); | |
752 | return; | |
753 | } | |
754 | /* | |
755 | * If the task's timeout handler has fired, use the t_task_cdbs_timeout | |
756 | * left counter to determine when the struct se_cmd is ready to be queued to | |
757 | * the processing thread. | |
758 | */ | |
6c76bf95 | 759 | if (task->task_flags & TF_TIMEOUT) { |
6708bb27 AG |
760 | if (!atomic_dec_and_test( |
761 | &cmd->t_task_cdbs_timeout_left)) { | |
a1d8b49a | 762 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
763 | flags); |
764 | return; | |
765 | } | |
766 | t_state = TRANSPORT_COMPLETE_TIMEOUT; | |
a1d8b49a | 767 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
768 | |
769 | transport_add_cmd_to_queue(cmd, t_state); | |
770 | return; | |
771 | } | |
a1d8b49a | 772 | atomic_dec(&cmd->t_task_cdbs_timeout_left); |
c66ac9db NB |
773 | |
774 | /* | |
775 | * Decrement the outstanding t_task_cdbs_left count. The last | |
776 | * struct se_task from struct se_cmd will complete itself into the | |
777 | * device queue depending upon int success. | |
778 | */ | |
6708bb27 | 779 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
c66ac9db | 780 | if (!success) |
a1d8b49a | 781 | cmd->t_tasks_failed = 1; |
c66ac9db | 782 | |
a1d8b49a | 783 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
784 | return; |
785 | } | |
786 | ||
a1d8b49a | 787 | if (!success || cmd->t_tasks_failed) { |
c66ac9db NB |
788 | t_state = TRANSPORT_COMPLETE_FAILURE; |
789 | if (!task->task_error_status) { | |
790 | task->task_error_status = | |
791 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
792 | cmd->transport_error_status = | |
793 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
794 | } | |
795 | } else { | |
a1d8b49a | 796 | atomic_set(&cmd->t_transport_complete, 1); |
c66ac9db NB |
797 | t_state = TRANSPORT_COMPLETE_OK; |
798 | } | |
a1d8b49a | 799 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
800 | |
801 | transport_add_cmd_to_queue(cmd, t_state); | |
802 | } | |
803 | EXPORT_SYMBOL(transport_complete_task); | |
804 | ||
805 | /* | |
806 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
807 | * struct se_task list are ready to be added to the active execution list | |
808 | * struct se_device | |
809 | ||
810 | * Called with se_dev_t->execute_task_lock called. | |
811 | */ | |
812 | static inline int transport_add_task_check_sam_attr( | |
813 | struct se_task *task, | |
814 | struct se_task *task_prev, | |
815 | struct se_device *dev) | |
816 | { | |
817 | /* | |
818 | * No SAM Task attribute emulation enabled, add to tail of | |
819 | * execution queue | |
820 | */ | |
821 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
822 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
823 | return 0; | |
824 | } | |
825 | /* | |
826 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
827 | * the first task that is associated with a struct se_cmd goes to | |
828 | * head of the struct se_device->execute_task_list, and task_prev | |
829 | * after that for each subsequent task | |
830 | */ | |
e66ecd50 | 831 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
832 | list_add(&task->t_execute_list, |
833 | (task_prev != NULL) ? | |
834 | &task_prev->t_execute_list : | |
835 | &dev->execute_task_list); | |
836 | ||
6708bb27 | 837 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 838 | " in execution queue\n", |
6708bb27 | 839 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
840 | return 1; |
841 | } | |
842 | /* | |
843 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
844 | * transitioned from Dermant -> Active state, and are added to the end | |
845 | * of the struct se_device->execute_task_list | |
846 | */ | |
847 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
848 | return 0; | |
849 | } | |
850 | ||
851 | /* __transport_add_task_to_execute_queue(): | |
852 | * | |
853 | * Called with se_dev_t->execute_task_lock called. | |
854 | */ | |
855 | static void __transport_add_task_to_execute_queue( | |
856 | struct se_task *task, | |
857 | struct se_task *task_prev, | |
858 | struct se_device *dev) | |
859 | { | |
860 | int head_of_queue; | |
861 | ||
862 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
863 | atomic_inc(&dev->execute_tasks); | |
864 | ||
865 | if (atomic_read(&task->task_state_active)) | |
866 | return; | |
867 | /* | |
868 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
869 | * state list as well. Running with SAM Task Attribute emulation | |
870 | * will always return head_of_queue == 0 here | |
871 | */ | |
872 | if (head_of_queue) | |
873 | list_add(&task->t_state_list, (task_prev) ? | |
874 | &task_prev->t_state_list : | |
875 | &dev->state_task_list); | |
876 | else | |
877 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
878 | ||
879 | atomic_set(&task->task_state_active, 1); | |
880 | ||
6708bb27 | 881 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 882 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
883 | task, dev); |
884 | } | |
885 | ||
886 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
887 | { | |
42bf829e | 888 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
889 | struct se_task *task; |
890 | unsigned long flags; | |
891 | ||
a1d8b49a AG |
892 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
893 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db NB |
894 | if (atomic_read(&task->task_state_active)) |
895 | continue; | |
896 | ||
897 | spin_lock(&dev->execute_task_lock); | |
898 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
899 | atomic_set(&task->task_state_active, 1); | |
900 | ||
6708bb27 AG |
901 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
902 | task->task_se_cmd->se_tfo->get_task_tag( | |
c66ac9db NB |
903 | task->task_se_cmd), task, dev); |
904 | ||
905 | spin_unlock(&dev->execute_task_lock); | |
906 | } | |
a1d8b49a | 907 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
908 | } |
909 | ||
910 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
911 | { | |
5951146d | 912 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
913 | struct se_task *task, *task_prev = NULL; |
914 | unsigned long flags; | |
915 | ||
916 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
a1d8b49a | 917 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 918 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
919 | continue; |
920 | /* | |
921 | * __transport_add_task_to_execute_queue() handles the | |
922 | * SAM Task Attribute emulation if enabled | |
923 | */ | |
924 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
925 | task_prev = task; |
926 | } | |
927 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db NB |
928 | } |
929 | ||
04629b7b CH |
930 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
931 | struct se_device *dev) | |
932 | { | |
933 | list_del_init(&task->t_execute_list); | |
934 | atomic_dec(&dev->execute_tasks); | |
935 | } | |
936 | ||
52208ae3 | 937 | void transport_remove_task_from_execute_queue( |
c66ac9db NB |
938 | struct se_task *task, |
939 | struct se_device *dev) | |
940 | { | |
941 | unsigned long flags; | |
942 | ||
04629b7b | 943 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 944 | return; |
af57c3ac | 945 | |
c66ac9db | 946 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 947 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
948 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
949 | } | |
950 | ||
07bde79a NB |
951 | /* |
952 | * Handle QUEUE_FULL / -EAGAIN status | |
953 | */ | |
954 | ||
955 | static void target_qf_do_work(struct work_struct *work) | |
956 | { | |
957 | struct se_device *dev = container_of(work, struct se_device, | |
958 | qf_work_queue); | |
bcac364a | 959 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
960 | struct se_cmd *cmd, *cmd_tmp; |
961 | ||
962 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
963 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
964 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 965 | |
bcac364a | 966 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
967 | list_del(&cmd->se_qf_node); |
968 | atomic_dec(&dev->dev_qf_count); | |
969 | smp_mb__after_atomic_dec(); | |
07bde79a | 970 | |
6708bb27 | 971 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a NB |
972 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
973 | (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" : | |
974 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" | |
975 | : "UNKNOWN"); | |
976 | /* | |
977 | * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd | |
978 | * has been added to head of queue | |
979 | */ | |
980 | transport_add_cmd_to_queue(cmd, cmd->t_state); | |
07bde79a | 981 | } |
07bde79a NB |
982 | } |
983 | ||
c66ac9db NB |
984 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
985 | { | |
986 | switch (cmd->data_direction) { | |
987 | case DMA_NONE: | |
988 | return "NONE"; | |
989 | case DMA_FROM_DEVICE: | |
990 | return "READ"; | |
991 | case DMA_TO_DEVICE: | |
992 | return "WRITE"; | |
993 | case DMA_BIDIRECTIONAL: | |
994 | return "BIDI"; | |
995 | default: | |
996 | break; | |
997 | } | |
998 | ||
999 | return "UNKNOWN"; | |
1000 | } | |
1001 | ||
1002 | void transport_dump_dev_state( | |
1003 | struct se_device *dev, | |
1004 | char *b, | |
1005 | int *bl) | |
1006 | { | |
1007 | *bl += sprintf(b + *bl, "Status: "); | |
1008 | switch (dev->dev_status) { | |
1009 | case TRANSPORT_DEVICE_ACTIVATED: | |
1010 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
1011 | break; | |
1012 | case TRANSPORT_DEVICE_DEACTIVATED: | |
1013 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
1014 | break; | |
1015 | case TRANSPORT_DEVICE_SHUTDOWN: | |
1016 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
1017 | break; | |
1018 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
1019 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
1020 | *bl += sprintf(b + *bl, "OFFLINE"); | |
1021 | break; | |
1022 | default: | |
1023 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
1024 | break; | |
1025 | } | |
1026 | ||
1027 | *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d", | |
1028 | atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left), | |
1029 | dev->queue_depth); | |
1030 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", | |
e3d6f909 | 1031 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
1032 | *bl += sprintf(b + *bl, " "); |
1033 | } | |
1034 | ||
c66ac9db NB |
1035 | void transport_dump_vpd_proto_id( |
1036 | struct t10_vpd *vpd, | |
1037 | unsigned char *p_buf, | |
1038 | int p_buf_len) | |
1039 | { | |
1040 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1041 | int len; | |
1042 | ||
1043 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1044 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
1045 | ||
1046 | switch (vpd->protocol_identifier) { | |
1047 | case 0x00: | |
1048 | sprintf(buf+len, "Fibre Channel\n"); | |
1049 | break; | |
1050 | case 0x10: | |
1051 | sprintf(buf+len, "Parallel SCSI\n"); | |
1052 | break; | |
1053 | case 0x20: | |
1054 | sprintf(buf+len, "SSA\n"); | |
1055 | break; | |
1056 | case 0x30: | |
1057 | sprintf(buf+len, "IEEE 1394\n"); | |
1058 | break; | |
1059 | case 0x40: | |
1060 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
1061 | " Protocol\n"); | |
1062 | break; | |
1063 | case 0x50: | |
1064 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1065 | break; | |
1066 | case 0x60: | |
1067 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1068 | break; | |
1069 | case 0x70: | |
1070 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1071 | " Protocol\n"); | |
1072 | break; | |
1073 | case 0x80: | |
1074 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1075 | break; | |
1076 | default: | |
1077 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1078 | vpd->protocol_identifier); | |
1079 | break; | |
1080 | } | |
1081 | ||
1082 | if (p_buf) | |
1083 | strncpy(p_buf, buf, p_buf_len); | |
1084 | else | |
6708bb27 | 1085 | pr_debug("%s", buf); |
c66ac9db NB |
1086 | } |
1087 | ||
1088 | void | |
1089 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1090 | { | |
1091 | /* | |
1092 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1093 | * | |
1094 | * from spc3r23.pdf section 7.5.1 | |
1095 | */ | |
1096 | if (page_83[1] & 0x80) { | |
1097 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1098 | vpd->protocol_identifier_set = 1; | |
1099 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1100 | } | |
1101 | } | |
1102 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1103 | ||
1104 | int transport_dump_vpd_assoc( | |
1105 | struct t10_vpd *vpd, | |
1106 | unsigned char *p_buf, | |
1107 | int p_buf_len) | |
1108 | { | |
1109 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1110 | int ret = 0; |
1111 | int len; | |
c66ac9db NB |
1112 | |
1113 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1114 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1115 | ||
1116 | switch (vpd->association) { | |
1117 | case 0x00: | |
1118 | sprintf(buf+len, "addressed logical unit\n"); | |
1119 | break; | |
1120 | case 0x10: | |
1121 | sprintf(buf+len, "target port\n"); | |
1122 | break; | |
1123 | case 0x20: | |
1124 | sprintf(buf+len, "SCSI target device\n"); | |
1125 | break; | |
1126 | default: | |
1127 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1128 | ret = -EINVAL; |
c66ac9db NB |
1129 | break; |
1130 | } | |
1131 | ||
1132 | if (p_buf) | |
1133 | strncpy(p_buf, buf, p_buf_len); | |
1134 | else | |
6708bb27 | 1135 | pr_debug("%s", buf); |
c66ac9db NB |
1136 | |
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1141 | { | |
1142 | /* | |
1143 | * The VPD identification association.. | |
1144 | * | |
1145 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1146 | */ | |
1147 | vpd->association = (page_83[1] & 0x30); | |
1148 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1149 | } | |
1150 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1151 | ||
1152 | int transport_dump_vpd_ident_type( | |
1153 | struct t10_vpd *vpd, | |
1154 | unsigned char *p_buf, | |
1155 | int p_buf_len) | |
1156 | { | |
1157 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1158 | int ret = 0; |
1159 | int len; | |
c66ac9db NB |
1160 | |
1161 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1162 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1163 | ||
1164 | switch (vpd->device_identifier_type) { | |
1165 | case 0x00: | |
1166 | sprintf(buf+len, "Vendor specific\n"); | |
1167 | break; | |
1168 | case 0x01: | |
1169 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1170 | break; | |
1171 | case 0x02: | |
1172 | sprintf(buf+len, "EUI-64 based\n"); | |
1173 | break; | |
1174 | case 0x03: | |
1175 | sprintf(buf+len, "NAA\n"); | |
1176 | break; | |
1177 | case 0x04: | |
1178 | sprintf(buf+len, "Relative target port identifier\n"); | |
1179 | break; | |
1180 | case 0x08: | |
1181 | sprintf(buf+len, "SCSI name string\n"); | |
1182 | break; | |
1183 | default: | |
1184 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1185 | vpd->device_identifier_type); | |
e3d6f909 | 1186 | ret = -EINVAL; |
c66ac9db NB |
1187 | break; |
1188 | } | |
1189 | ||
e3d6f909 AG |
1190 | if (p_buf) { |
1191 | if (p_buf_len < strlen(buf)+1) | |
1192 | return -EINVAL; | |
c66ac9db | 1193 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1194 | } else { |
6708bb27 | 1195 | pr_debug("%s", buf); |
e3d6f909 | 1196 | } |
c66ac9db NB |
1197 | |
1198 | return ret; | |
1199 | } | |
1200 | ||
1201 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1202 | { | |
1203 | /* | |
1204 | * The VPD identifier type.. | |
1205 | * | |
1206 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1207 | */ | |
1208 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1209 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1210 | } | |
1211 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1212 | ||
1213 | int transport_dump_vpd_ident( | |
1214 | struct t10_vpd *vpd, | |
1215 | unsigned char *p_buf, | |
1216 | int p_buf_len) | |
1217 | { | |
1218 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1219 | int ret = 0; | |
1220 | ||
1221 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1222 | ||
1223 | switch (vpd->device_identifier_code_set) { | |
1224 | case 0x01: /* Binary */ | |
1225 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1226 | &vpd->device_identifier[0]); | |
1227 | break; | |
1228 | case 0x02: /* ASCII */ | |
1229 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1230 | &vpd->device_identifier[0]); | |
1231 | break; | |
1232 | case 0x03: /* UTF-8 */ | |
1233 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1234 | &vpd->device_identifier[0]); | |
1235 | break; | |
1236 | default: | |
1237 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1238 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1239 | ret = -EINVAL; |
c66ac9db NB |
1240 | break; |
1241 | } | |
1242 | ||
1243 | if (p_buf) | |
1244 | strncpy(p_buf, buf, p_buf_len); | |
1245 | else | |
6708bb27 | 1246 | pr_debug("%s", buf); |
c66ac9db NB |
1247 | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | int | |
1252 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1253 | { | |
1254 | static const char hex_str[] = "0123456789abcdef"; | |
1255 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1256 | ||
1257 | /* | |
1258 | * The VPD Code Set (encoding) | |
1259 | * | |
1260 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1261 | */ | |
1262 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1263 | switch (vpd->device_identifier_code_set) { | |
1264 | case 0x01: /* Binary */ | |
1265 | vpd->device_identifier[j++] = | |
1266 | hex_str[vpd->device_identifier_type]; | |
1267 | while (i < (4 + page_83[3])) { | |
1268 | vpd->device_identifier[j++] = | |
1269 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1270 | vpd->device_identifier[j++] = | |
1271 | hex_str[page_83[i] & 0x0f]; | |
1272 | i++; | |
1273 | } | |
1274 | break; | |
1275 | case 0x02: /* ASCII */ | |
1276 | case 0x03: /* UTF-8 */ | |
1277 | while (i < (4 + page_83[3])) | |
1278 | vpd->device_identifier[j++] = page_83[i++]; | |
1279 | break; | |
1280 | default: | |
1281 | break; | |
1282 | } | |
1283 | ||
1284 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1285 | } | |
1286 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1287 | ||
1288 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1289 | { | |
1290 | /* | |
1291 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1292 | * SAM Task Attribute emulation. | |
1293 | * | |
1294 | * This is currently not available in upsream Linux/SCSI Target | |
1295 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1296 | */ | |
e3d6f909 | 1297 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1298 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1299 | return; | |
1300 | } | |
1301 | ||
1302 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1303 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1304 | " device\n", dev->transport->name, |
1305 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1306 | } |
1307 | ||
1308 | static void scsi_dump_inquiry(struct se_device *dev) | |
1309 | { | |
e3d6f909 | 1310 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
c66ac9db NB |
1311 | int i, device_type; |
1312 | /* | |
1313 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1314 | */ | |
6708bb27 | 1315 | pr_debug(" Vendor: "); |
c66ac9db NB |
1316 | for (i = 0; i < 8; i++) |
1317 | if (wwn->vendor[i] >= 0x20) | |
6708bb27 | 1318 | pr_debug("%c", wwn->vendor[i]); |
c66ac9db | 1319 | else |
6708bb27 | 1320 | pr_debug(" "); |
c66ac9db | 1321 | |
6708bb27 | 1322 | pr_debug(" Model: "); |
c66ac9db NB |
1323 | for (i = 0; i < 16; i++) |
1324 | if (wwn->model[i] >= 0x20) | |
6708bb27 | 1325 | pr_debug("%c", wwn->model[i]); |
c66ac9db | 1326 | else |
6708bb27 | 1327 | pr_debug(" "); |
c66ac9db | 1328 | |
6708bb27 | 1329 | pr_debug(" Revision: "); |
c66ac9db NB |
1330 | for (i = 0; i < 4; i++) |
1331 | if (wwn->revision[i] >= 0x20) | |
6708bb27 | 1332 | pr_debug("%c", wwn->revision[i]); |
c66ac9db | 1333 | else |
6708bb27 | 1334 | pr_debug(" "); |
c66ac9db | 1335 | |
6708bb27 | 1336 | pr_debug("\n"); |
c66ac9db | 1337 | |
e3d6f909 | 1338 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1339 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1340 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1341 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1342 | } |
1343 | ||
1344 | struct se_device *transport_add_device_to_core_hba( | |
1345 | struct se_hba *hba, | |
1346 | struct se_subsystem_api *transport, | |
1347 | struct se_subsystem_dev *se_dev, | |
1348 | u32 device_flags, | |
1349 | void *transport_dev, | |
1350 | struct se_dev_limits *dev_limits, | |
1351 | const char *inquiry_prod, | |
1352 | const char *inquiry_rev) | |
1353 | { | |
12a18bdc | 1354 | int force_pt; |
c66ac9db NB |
1355 | struct se_device *dev; |
1356 | ||
1357 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1358 | if (!dev) { |
1359 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1360 | return NULL; |
1361 | } | |
c66ac9db | 1362 | |
e3d6f909 | 1363 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1364 | dev->dev_flags = device_flags; |
1365 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1366 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1367 | dev->se_hba = hba; |
1368 | dev->se_sub_dev = se_dev; | |
1369 | dev->transport = transport; | |
1370 | atomic_set(&dev->active_cmds, 0); | |
1371 | INIT_LIST_HEAD(&dev->dev_list); | |
1372 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1373 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1374 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1375 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
1376 | INIT_LIST_HEAD(&dev->ordered_cmd_list); | |
1377 | INIT_LIST_HEAD(&dev->state_task_list); | |
07bde79a | 1378 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1379 | spin_lock_init(&dev->execute_task_lock); |
1380 | spin_lock_init(&dev->delayed_cmd_lock); | |
1381 | spin_lock_init(&dev->ordered_cmd_lock); | |
1382 | spin_lock_init(&dev->state_task_lock); | |
1383 | spin_lock_init(&dev->dev_alua_lock); | |
1384 | spin_lock_init(&dev->dev_reservation_lock); | |
1385 | spin_lock_init(&dev->dev_status_lock); | |
1386 | spin_lock_init(&dev->dev_status_thr_lock); | |
1387 | spin_lock_init(&dev->se_port_lock); | |
1388 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1389 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1390 | |
1391 | dev->queue_depth = dev_limits->queue_depth; | |
1392 | atomic_set(&dev->depth_left, dev->queue_depth); | |
1393 | atomic_set(&dev->dev_ordered_id, 0); | |
1394 | ||
1395 | se_dev_set_default_attribs(dev, dev_limits); | |
1396 | ||
1397 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1398 | dev->creation_time = get_jiffies_64(); | |
1399 | spin_lock_init(&dev->stats_lock); | |
1400 | ||
1401 | spin_lock(&hba->device_lock); | |
1402 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1403 | hba->dev_count++; | |
1404 | spin_unlock(&hba->device_lock); | |
1405 | /* | |
1406 | * Setup the SAM Task Attribute emulation for struct se_device | |
1407 | */ | |
1408 | core_setup_task_attr_emulation(dev); | |
1409 | /* | |
1410 | * Force PR and ALUA passthrough emulation with internal object use. | |
1411 | */ | |
1412 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1413 | /* | |
1414 | * Setup the Reservations infrastructure for struct se_device | |
1415 | */ | |
1416 | core_setup_reservations(dev, force_pt); | |
1417 | /* | |
1418 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1419 | */ | |
1420 | if (core_setup_alua(dev, force_pt) < 0) | |
1421 | goto out; | |
1422 | ||
1423 | /* | |
1424 | * Startup the struct se_device processing thread | |
1425 | */ | |
1426 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1427 | "LIO_%s", dev->transport->name); |
c66ac9db | 1428 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1429 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1430 | dev->transport->name); |
c66ac9db NB |
1431 | goto out; |
1432 | } | |
07bde79a NB |
1433 | /* |
1434 | * Setup work_queue for QUEUE_FULL | |
1435 | */ | |
1436 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1437 | /* |
1438 | * Preload the initial INQUIRY const values if we are doing | |
1439 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1440 | * passthrough because this is being provided by the backend LLD. | |
1441 | * This is required so that transport_get_inquiry() copies these | |
1442 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1443 | * setup. | |
1444 | */ | |
e3d6f909 | 1445 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1446 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1447 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1448 | " INQUIRY consts\n"); |
1449 | goto out; | |
1450 | } | |
1451 | ||
e3d6f909 AG |
1452 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1453 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1454 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1455 | } |
1456 | scsi_dump_inquiry(dev); | |
1457 | ||
12a18bdc | 1458 | return dev; |
c66ac9db | 1459 | out: |
c66ac9db NB |
1460 | kthread_stop(dev->process_thread); |
1461 | ||
1462 | spin_lock(&hba->device_lock); | |
1463 | list_del(&dev->dev_list); | |
1464 | hba->dev_count--; | |
1465 | spin_unlock(&hba->device_lock); | |
1466 | ||
1467 | se_release_vpd_for_dev(dev); | |
1468 | ||
c66ac9db NB |
1469 | kfree(dev); |
1470 | ||
1471 | return NULL; | |
1472 | } | |
1473 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1474 | ||
1475 | /* transport_generic_prepare_cdb(): | |
1476 | * | |
1477 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1478 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1479 | * The point of this is since we are mapping iSCSI LUNs to | |
1480 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1481 | * devices and HBAs for a loop. | |
1482 | */ | |
1483 | static inline void transport_generic_prepare_cdb( | |
1484 | unsigned char *cdb) | |
1485 | { | |
1486 | switch (cdb[0]) { | |
1487 | case READ_10: /* SBC - RDProtect */ | |
1488 | case READ_12: /* SBC - RDProtect */ | |
1489 | case READ_16: /* SBC - RDProtect */ | |
1490 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1491 | case VERIFY: /* SBC - VRProtect */ | |
1492 | case VERIFY_16: /* SBC - VRProtect */ | |
1493 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1494 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1495 | break; | |
1496 | default: | |
1497 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1498 | break; | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | static struct se_task * | |
1503 | transport_generic_get_task(struct se_cmd *cmd, | |
1504 | enum dma_data_direction data_direction) | |
1505 | { | |
1506 | struct se_task *task; | |
5951146d | 1507 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1508 | |
6708bb27 | 1509 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1510 | if (!task) { |
6708bb27 | 1511 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1512 | return NULL; |
1513 | } | |
1514 | ||
1515 | INIT_LIST_HEAD(&task->t_list); | |
1516 | INIT_LIST_HEAD(&task->t_execute_list); | |
1517 | INIT_LIST_HEAD(&task->t_state_list); | |
1518 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1519 | task->task_se_cmd = cmd; |
c66ac9db NB |
1520 | task->task_data_direction = data_direction; |
1521 | ||
c66ac9db NB |
1522 | return task; |
1523 | } | |
1524 | ||
1525 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1526 | ||
c66ac9db NB |
1527 | /* |
1528 | * Used by fabric modules containing a local struct se_cmd within their | |
1529 | * fabric dependent per I/O descriptor. | |
1530 | */ | |
1531 | void transport_init_se_cmd( | |
1532 | struct se_cmd *cmd, | |
1533 | struct target_core_fabric_ops *tfo, | |
1534 | struct se_session *se_sess, | |
1535 | u32 data_length, | |
1536 | int data_direction, | |
1537 | int task_attr, | |
1538 | unsigned char *sense_buffer) | |
1539 | { | |
5951146d AG |
1540 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1541 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
1542 | INIT_LIST_HEAD(&cmd->se_ordered_node); | |
07bde79a | 1543 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1544 | INIT_LIST_HEAD(&cmd->se_queue_node); |
c66ac9db | 1545 | |
a1d8b49a AG |
1546 | INIT_LIST_HEAD(&cmd->t_task_list); |
1547 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1548 | init_completion(&cmd->transport_lun_stop_comp); | |
1549 | init_completion(&cmd->t_transport_stop_comp); | |
1550 | spin_lock_init(&cmd->t_state_lock); | |
1551 | atomic_set(&cmd->transport_dev_active, 1); | |
c66ac9db NB |
1552 | |
1553 | cmd->se_tfo = tfo; | |
1554 | cmd->se_sess = se_sess; | |
1555 | cmd->data_length = data_length; | |
1556 | cmd->data_direction = data_direction; | |
1557 | cmd->sam_task_attr = task_attr; | |
1558 | cmd->sense_buffer = sense_buffer; | |
1559 | } | |
1560 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1561 | ||
1562 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1563 | { | |
1564 | /* | |
1565 | * Check if SAM Task Attribute emulation is enabled for this | |
1566 | * struct se_device storage object | |
1567 | */ | |
5951146d | 1568 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1569 | return 0; |
1570 | ||
e66ecd50 | 1571 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1572 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1573 | " emulation is not supported\n"); |
e3d6f909 | 1574 | return -EINVAL; |
c66ac9db NB |
1575 | } |
1576 | /* | |
1577 | * Used to determine when ORDERED commands should go from | |
1578 | * Dormant to Active status. | |
1579 | */ | |
5951146d | 1580 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1581 | smp_mb__after_atomic_inc(); |
6708bb27 | 1582 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1583 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1584 | cmd->se_dev->transport->name); |
c66ac9db NB |
1585 | return 0; |
1586 | } | |
1587 | ||
c66ac9db NB |
1588 | /* transport_generic_allocate_tasks(): |
1589 | * | |
1590 | * Called from fabric RX Thread. | |
1591 | */ | |
1592 | int transport_generic_allocate_tasks( | |
1593 | struct se_cmd *cmd, | |
1594 | unsigned char *cdb) | |
1595 | { | |
1596 | int ret; | |
1597 | ||
1598 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1599 | /* |
1600 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1601 | * for VARIABLE_LENGTH_CMD | |
1602 | */ | |
1603 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1604 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1605 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1606 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
e3d6f909 | 1607 | return -EINVAL; |
c66ac9db NB |
1608 | } |
1609 | /* | |
1610 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1611 | * allocate the additional extended CDB buffer now.. Otherwise | |
1612 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1613 | */ | |
a1d8b49a AG |
1614 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1615 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1616 | GFP_KERNEL); |
6708bb27 AG |
1617 | if (!cmd->t_task_cdb) { |
1618 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1619 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1620 | scsi_command_size(cdb), |
a1d8b49a | 1621 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
e3d6f909 | 1622 | return -ENOMEM; |
c66ac9db NB |
1623 | } |
1624 | } else | |
a1d8b49a | 1625 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1626 | /* |
a1d8b49a | 1627 | * Copy the original CDB into cmd-> |
c66ac9db | 1628 | */ |
a1d8b49a | 1629 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1630 | /* |
1631 | * Setup the received CDB based on SCSI defined opcodes and | |
1632 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1633 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1634 | * pointer is expected to be setup before we reach this point. |
1635 | */ | |
1636 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1637 | if (ret < 0) | |
1638 | return ret; | |
1639 | /* | |
1640 | * Check for SAM Task Attribute Emulation | |
1641 | */ | |
1642 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1643 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1644 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1645 | return -EINVAL; |
c66ac9db NB |
1646 | } |
1647 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1648 | if (cmd->se_lun->lun_sep) | |
1649 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1650 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1651 | return 0; | |
1652 | } | |
1653 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1654 | ||
dd8ae59d NB |
1655 | static void transport_generic_request_failure(struct se_cmd *, |
1656 | struct se_device *, int, int); | |
695434e1 NB |
1657 | /* |
1658 | * Used by fabric module frontends to queue tasks directly. | |
1659 | * Many only be used from process context only | |
1660 | */ | |
1661 | int transport_handle_cdb_direct( | |
1662 | struct se_cmd *cmd) | |
1663 | { | |
dd8ae59d NB |
1664 | int ret; |
1665 | ||
695434e1 NB |
1666 | if (!cmd->se_lun) { |
1667 | dump_stack(); | |
6708bb27 | 1668 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1669 | return -EINVAL; |
1670 | } | |
1671 | if (in_interrupt()) { | |
1672 | dump_stack(); | |
6708bb27 | 1673 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1674 | " from interrupt context\n"); |
1675 | return -EINVAL; | |
1676 | } | |
dd8ae59d NB |
1677 | /* |
1678 | * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following | |
1679 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() | |
1680 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1681 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1682 | * |
1683 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1684 | * this to be called for initial descriptor submission. | |
1685 | */ | |
1686 | cmd->t_state = TRANSPORT_NEW_CMD; | |
1687 | atomic_set(&cmd->t_transport_active, 1); | |
1688 | /* | |
1689 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1690 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1691 | * and call transport_generic_request_failure() if necessary.. | |
1692 | */ | |
1693 | ret = transport_generic_new_cmd(cmd); | |
1694 | if (ret == -EAGAIN) | |
1695 | return 0; | |
1696 | else if (ret < 0) { | |
1697 | cmd->transport_error_status = ret; | |
1698 | transport_generic_request_failure(cmd, NULL, 0, | |
1699 | (cmd->data_direction != DMA_TO_DEVICE)); | |
1700 | } | |
1701 | return 0; | |
695434e1 NB |
1702 | } |
1703 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1704 | ||
c66ac9db NB |
1705 | /* |
1706 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1707 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1708 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1709 | */ | |
1710 | int transport_generic_handle_cdb_map( | |
1711 | struct se_cmd *cmd) | |
1712 | { | |
e3d6f909 | 1713 | if (!cmd->se_lun) { |
c66ac9db | 1714 | dump_stack(); |
6708bb27 | 1715 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1716 | return -EINVAL; |
c66ac9db NB |
1717 | } |
1718 | ||
1719 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP); | |
1720 | return 0; | |
1721 | } | |
1722 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1723 | ||
1724 | /* transport_generic_handle_data(): | |
1725 | * | |
1726 | * | |
1727 | */ | |
1728 | int transport_generic_handle_data( | |
1729 | struct se_cmd *cmd) | |
1730 | { | |
1731 | /* | |
1732 | * For the software fabric case, then we assume the nexus is being | |
1733 | * failed/shutdown when signals are pending from the kthread context | |
1734 | * caller, so we return a failure. For the HW target mode case running | |
1735 | * in interrupt code, the signal_pending() check is skipped. | |
1736 | */ | |
1737 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1738 | return -EPERM; |
c66ac9db NB |
1739 | /* |
1740 | * If the received CDB has aleady been ABORTED by the generic | |
1741 | * target engine, we now call transport_check_aborted_status() | |
1742 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1743 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1744 | * sequences at this point. |
1745 | */ | |
1746 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1747 | return 0; | |
1748 | ||
1749 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE); | |
1750 | return 0; | |
1751 | } | |
1752 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1753 | ||
1754 | /* transport_generic_handle_tmr(): | |
1755 | * | |
1756 | * | |
1757 | */ | |
1758 | int transport_generic_handle_tmr( | |
1759 | struct se_cmd *cmd) | |
1760 | { | |
c66ac9db NB |
1761 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR); |
1762 | return 0; | |
1763 | } | |
1764 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1765 | ||
f4366772 NB |
1766 | void transport_generic_free_cmd_intr( |
1767 | struct se_cmd *cmd) | |
1768 | { | |
1769 | transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR); | |
1770 | } | |
1771 | EXPORT_SYMBOL(transport_generic_free_cmd_intr); | |
1772 | ||
c66ac9db NB |
1773 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1774 | { | |
1775 | struct se_task *task, *task_tmp; | |
1776 | unsigned long flags; | |
1777 | int ret = 0; | |
1778 | ||
6708bb27 | 1779 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1780 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1781 | |
1782 | /* | |
1783 | * No tasks remain in the execution queue | |
1784 | */ | |
a1d8b49a | 1785 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1786 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1787 | &cmd->t_task_list, t_list) { |
04629b7b | 1788 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1789 | /* |
1790 | * If the struct se_task has not been sent and is not active, | |
1791 | * remove the struct se_task from the execution queue. | |
1792 | */ | |
6c76bf95 | 1793 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1794 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1795 | flags); |
1796 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1797 | cmd->se_dev); |
c66ac9db | 1798 | |
04629b7b | 1799 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1800 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1801 | continue; |
1802 | } | |
1803 | ||
1804 | /* | |
1805 | * If the struct se_task is active, sleep until it is returned | |
1806 | * from the plugin. | |
1807 | */ | |
6c76bf95 CH |
1808 | if (task->task_flags & TF_ACTIVE) { |
1809 | task->task_flags |= TF_REQUEST_STOP; | |
a1d8b49a | 1810 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1811 | flags); |
1812 | ||
04629b7b | 1813 | pr_debug("Task %p waiting to complete\n", task); |
c66ac9db | 1814 | wait_for_completion(&task->task_stop_comp); |
04629b7b | 1815 | pr_debug("Task %p stopped successfully\n", task); |
c66ac9db | 1816 | |
a1d8b49a AG |
1817 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
1818 | atomic_dec(&cmd->t_task_cdbs_left); | |
6c76bf95 | 1819 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); |
c66ac9db | 1820 | } else { |
04629b7b | 1821 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1822 | ret++; |
1823 | } | |
1824 | ||
1825 | __transport_stop_task_timer(task, &flags); | |
1826 | } | |
a1d8b49a | 1827 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1828 | |
1829 | return ret; | |
1830 | } | |
1831 | ||
c66ac9db NB |
1832 | /* |
1833 | * Handle SAM-esque emulation for generic transport request failures. | |
1834 | */ | |
1835 | static void transport_generic_request_failure( | |
1836 | struct se_cmd *cmd, | |
1837 | struct se_device *dev, | |
1838 | int complete, | |
1839 | int sc) | |
1840 | { | |
07bde79a NB |
1841 | int ret = 0; |
1842 | ||
6708bb27 | 1843 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1844 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1845 | cmd->t_task_cdb[0]); |
6708bb27 | 1846 | pr_debug("-----[ i_state: %d t_state/def_t_state:" |
c66ac9db | 1847 | " %d/%d transport_error_status: %d\n", |
e3d6f909 | 1848 | cmd->se_tfo->get_cmd_state(cmd), |
c66ac9db NB |
1849 | cmd->t_state, cmd->deferred_t_state, |
1850 | cmd->transport_error_status); | |
6708bb27 | 1851 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db NB |
1852 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
1853 | " t_transport_active: %d t_transport_stop: %d" | |
6708bb27 | 1854 | " t_transport_sent: %d\n", cmd->t_task_list_num, |
a1d8b49a AG |
1855 | atomic_read(&cmd->t_task_cdbs_left), |
1856 | atomic_read(&cmd->t_task_cdbs_sent), | |
1857 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
1858 | atomic_read(&cmd->t_transport_active), | |
1859 | atomic_read(&cmd->t_transport_stop), | |
1860 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db NB |
1861 | |
1862 | transport_stop_all_task_timers(cmd); | |
1863 | ||
1864 | if (dev) | |
e3d6f909 | 1865 | atomic_inc(&dev->depth_left); |
c66ac9db NB |
1866 | /* |
1867 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1868 | */ | |
1869 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1870 | transport_complete_task_attr(cmd); | |
1871 | ||
1872 | if (complete) { | |
1873 | transport_direct_request_timeout(cmd); | |
1874 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
1875 | } | |
1876 | ||
1877 | switch (cmd->transport_error_status) { | |
1878 | case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE: | |
1879 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1880 | break; | |
1881 | case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS: | |
1882 | cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; | |
1883 | break; | |
1884 | case PYX_TRANSPORT_INVALID_CDB_FIELD: | |
1885 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1886 | break; | |
1887 | case PYX_TRANSPORT_INVALID_PARAMETER_LIST: | |
1888 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
1889 | break; | |
1890 | case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES: | |
1891 | if (!sc) | |
1892 | transport_new_cmd_failure(cmd); | |
1893 | /* | |
1894 | * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES, | |
1895 | * we force this session to fall back to session | |
1896 | * recovery. | |
1897 | */ | |
e3d6f909 AG |
1898 | cmd->se_tfo->fall_back_to_erl0(cmd->se_sess); |
1899 | cmd->se_tfo->stop_session(cmd->se_sess, 0, 0); | |
c66ac9db NB |
1900 | |
1901 | goto check_stop; | |
1902 | case PYX_TRANSPORT_LU_COMM_FAILURE: | |
1903 | case PYX_TRANSPORT_ILLEGAL_REQUEST: | |
1904 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1905 | break; | |
1906 | case PYX_TRANSPORT_UNKNOWN_MODE_PAGE: | |
1907 | cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; | |
1908 | break; | |
1909 | case PYX_TRANSPORT_WRITE_PROTECTED: | |
1910 | cmd->scsi_sense_reason = TCM_WRITE_PROTECTED; | |
1911 | break; | |
1912 | case PYX_TRANSPORT_RESERVATION_CONFLICT: | |
1913 | /* | |
1914 | * No SENSE Data payload for this case, set SCSI Status | |
1915 | * and queue the response to $FABRIC_MOD. | |
1916 | * | |
1917 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1918 | */ | |
1919 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1920 | /* | |
1921 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1922 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1923 | * CONFLICT STATUS. | |
1924 | * | |
1925 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1926 | */ | |
e3d6f909 AG |
1927 | if (cmd->se_sess && |
1928 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1929 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1930 | cmd->orig_fe_lun, 0x2C, |
1931 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1932 | ||
07bde79a NB |
1933 | ret = cmd->se_tfo->queue_status(cmd); |
1934 | if (ret == -EAGAIN) | |
1935 | goto queue_full; | |
c66ac9db NB |
1936 | goto check_stop; |
1937 | case PYX_TRANSPORT_USE_SENSE_REASON: | |
1938 | /* | |
1939 | * struct se_cmd->scsi_sense_reason already set | |
1940 | */ | |
1941 | break; | |
1942 | default: | |
6708bb27 | 1943 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
a1d8b49a | 1944 | cmd->t_task_cdb[0], |
c66ac9db NB |
1945 | cmd->transport_error_status); |
1946 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1947 | break; | |
1948 | } | |
16ab8e60 NB |
1949 | /* |
1950 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1951 | * make the call to transport_send_check_condition_and_sense() | |
1952 | * directly. Otherwise expect the fabric to make the call to | |
1953 | * transport_send_check_condition_and_sense() after handling | |
1954 | * possible unsoliticied write data payloads. | |
1955 | */ | |
1956 | if (!sc && !cmd->se_tfo->new_cmd_map) | |
c66ac9db | 1957 | transport_new_cmd_failure(cmd); |
07bde79a NB |
1958 | else { |
1959 | ret = transport_send_check_condition_and_sense(cmd, | |
1960 | cmd->scsi_sense_reason, 0); | |
1961 | if (ret == -EAGAIN) | |
1962 | goto queue_full; | |
1963 | } | |
1964 | ||
c66ac9db NB |
1965 | check_stop: |
1966 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1967 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1968 | ; |
07bde79a NB |
1969 | return; |
1970 | ||
1971 | queue_full: | |
1972 | cmd->t_state = TRANSPORT_COMPLETE_OK; | |
1973 | transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf); | |
c66ac9db NB |
1974 | } |
1975 | ||
1976 | static void transport_direct_request_timeout(struct se_cmd *cmd) | |
1977 | { | |
1978 | unsigned long flags; | |
1979 | ||
a1d8b49a | 1980 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 1981 | if (!atomic_read(&cmd->t_transport_timeout)) { |
a1d8b49a | 1982 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1983 | return; |
1984 | } | |
a1d8b49a AG |
1985 | if (atomic_read(&cmd->t_task_cdbs_timeout_left)) { |
1986 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1987 | return; |
1988 | } | |
1989 | ||
a1d8b49a AG |
1990 | atomic_sub(atomic_read(&cmd->t_transport_timeout), |
1991 | &cmd->t_se_count); | |
1992 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1993 | } |
1994 | ||
1995 | static void transport_generic_request_timeout(struct se_cmd *cmd) | |
1996 | { | |
1997 | unsigned long flags; | |
1998 | ||
1999 | /* | |
e6a2573f | 2000 | * Reset cmd->t_se_count to allow transport_put_cmd() |
c66ac9db NB |
2001 | * to allow last call to free memory resources. |
2002 | */ | |
a1d8b49a AG |
2003 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2004 | if (atomic_read(&cmd->t_transport_timeout) > 1) { | |
2005 | int tmp = (atomic_read(&cmd->t_transport_timeout) - 1); | |
c66ac9db | 2006 | |
a1d8b49a | 2007 | atomic_sub(tmp, &cmd->t_se_count); |
c66ac9db | 2008 | } |
a1d8b49a | 2009 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2010 | |
e6a2573f | 2011 | transport_put_cmd(cmd); |
c66ac9db NB |
2012 | } |
2013 | ||
c66ac9db NB |
2014 | static inline u32 transport_lba_21(unsigned char *cdb) |
2015 | { | |
2016 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
2017 | } | |
2018 | ||
2019 | static inline u32 transport_lba_32(unsigned char *cdb) | |
2020 | { | |
2021 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2022 | } | |
2023 | ||
2024 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
2025 | { | |
2026 | unsigned int __v1, __v2; | |
2027 | ||
2028 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2029 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
2030 | ||
2031 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2032 | } | |
2033 | ||
2034 | /* | |
2035 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
2036 | */ | |
2037 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
2038 | { | |
2039 | unsigned int __v1, __v2; | |
2040 | ||
2041 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
2042 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
2043 | ||
2044 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2045 | } | |
2046 | ||
2047 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
2048 | { | |
2049 | unsigned long flags; | |
2050 | ||
a1d8b49a | 2051 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 2052 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 2053 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2054 | } |
2055 | ||
2056 | /* | |
2057 | * Called from interrupt context. | |
2058 | */ | |
2059 | static void transport_task_timeout_handler(unsigned long data) | |
2060 | { | |
2061 | struct se_task *task = (struct se_task *)data; | |
e3d6f909 | 2062 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db NB |
2063 | unsigned long flags; |
2064 | ||
6708bb27 | 2065 | pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd); |
c66ac9db | 2066 | |
a1d8b49a | 2067 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2068 | if (task->task_flags & TF_TIMER_STOP) { |
a1d8b49a | 2069 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2070 | return; |
2071 | } | |
6c76bf95 | 2072 | task->task_flags &= ~TF_TIMER_RUNNING; |
c66ac9db NB |
2073 | |
2074 | /* | |
2075 | * Determine if transport_complete_task() has already been called. | |
2076 | */ | |
6c76bf95 CH |
2077 | if (!(task->task_flags & TF_ACTIVE)) { |
2078 | pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n", | |
2079 | task, cmd); | |
a1d8b49a | 2080 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2081 | return; |
2082 | } | |
2083 | ||
a1d8b49a AG |
2084 | atomic_inc(&cmd->t_se_count); |
2085 | atomic_inc(&cmd->t_transport_timeout); | |
2086 | cmd->t_tasks_failed = 1; | |
c66ac9db | 2087 | |
6c76bf95 | 2088 | task->task_flags |= TF_TIMEOUT; |
c66ac9db NB |
2089 | task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT; |
2090 | task->task_scsi_status = 1; | |
2091 | ||
6c76bf95 CH |
2092 | if (task->task_flags & TF_REQUEST_STOP) { |
2093 | pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP" | |
c66ac9db | 2094 | " == 1\n", task, cmd); |
a1d8b49a | 2095 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2096 | complete(&task->task_stop_comp); |
2097 | return; | |
2098 | } | |
2099 | ||
6708bb27 AG |
2100 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
2101 | pr_debug("transport task: %p cmd: %p timeout non zero" | |
c66ac9db | 2102 | " t_task_cdbs_left\n", task, cmd); |
a1d8b49a | 2103 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2104 | return; |
2105 | } | |
6708bb27 | 2106 | pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n", |
c66ac9db NB |
2107 | task, cmd); |
2108 | ||
2109 | cmd->t_state = TRANSPORT_COMPLETE_FAILURE; | |
a1d8b49a | 2110 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2111 | |
2112 | transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE); | |
2113 | } | |
2114 | ||
2115 | /* | |
a1d8b49a | 2116 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
2117 | */ |
2118 | static void transport_start_task_timer(struct se_task *task) | |
2119 | { | |
42bf829e | 2120 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db NB |
2121 | int timeout; |
2122 | ||
6c76bf95 | 2123 | if (task->task_flags & TF_TIMER_RUNNING) |
c66ac9db NB |
2124 | return; |
2125 | /* | |
2126 | * If the task_timeout is disabled, exit now. | |
2127 | */ | |
e3d6f909 | 2128 | timeout = dev->se_sub_dev->se_dev_attrib.task_timeout; |
6708bb27 | 2129 | if (!timeout) |
c66ac9db NB |
2130 | return; |
2131 | ||
2132 | init_timer(&task->task_timer); | |
2133 | task->task_timer.expires = (get_jiffies_64() + timeout * HZ); | |
2134 | task->task_timer.data = (unsigned long) task; | |
2135 | task->task_timer.function = transport_task_timeout_handler; | |
2136 | ||
6c76bf95 | 2137 | task->task_flags |= TF_TIMER_RUNNING; |
c66ac9db NB |
2138 | add_timer(&task->task_timer); |
2139 | #if 0 | |
6708bb27 | 2140 | pr_debug("Starting task timer for cmd: %p task: %p seconds:" |
c66ac9db NB |
2141 | " %d\n", task->task_se_cmd, task, timeout); |
2142 | #endif | |
2143 | } | |
2144 | ||
2145 | /* | |
a1d8b49a | 2146 | * Called with spin_lock_irq(&cmd->t_state_lock) held. |
c66ac9db NB |
2147 | */ |
2148 | void __transport_stop_task_timer(struct se_task *task, unsigned long *flags) | |
2149 | { | |
e3d6f909 | 2150 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 2151 | |
6c76bf95 | 2152 | if (!(task->task_flags & TF_TIMER_RUNNING)) |
c66ac9db NB |
2153 | return; |
2154 | ||
6c76bf95 | 2155 | task->task_flags |= TF_TIMER_STOP; |
a1d8b49a | 2156 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db NB |
2157 | |
2158 | del_timer_sync(&task->task_timer); | |
2159 | ||
a1d8b49a | 2160 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
6c76bf95 CH |
2161 | task->task_flags &= ~TF_TIMER_RUNNING; |
2162 | task->task_flags &= ~TF_TIMER_STOP; | |
c66ac9db NB |
2163 | } |
2164 | ||
2165 | static void transport_stop_all_task_timers(struct se_cmd *cmd) | |
2166 | { | |
2167 | struct se_task *task = NULL, *task_tmp; | |
2168 | unsigned long flags; | |
2169 | ||
a1d8b49a | 2170 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2171 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 2172 | &cmd->t_task_list, t_list) |
c66ac9db | 2173 | __transport_stop_task_timer(task, &flags); |
a1d8b49a | 2174 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2175 | } |
2176 | ||
2177 | static inline int transport_tcq_window_closed(struct se_device *dev) | |
2178 | { | |
2179 | if (dev->dev_tcq_window_closed++ < | |
2180 | PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) { | |
2181 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT); | |
2182 | } else | |
2183 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG); | |
2184 | ||
e3d6f909 | 2185 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
2186 | return 0; |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Called from Fabric Module context from transport_execute_tasks() | |
2191 | * | |
2192 | * The return of this function determins if the tasks from struct se_cmd | |
2193 | * get added to the execution queue in transport_execute_tasks(), | |
2194 | * or are added to the delayed or ordered lists here. | |
2195 | */ | |
2196 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
2197 | { | |
5951146d | 2198 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
2199 | return 1; |
2200 | /* | |
25985edc | 2201 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
2202 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
2203 | */ | |
e66ecd50 | 2204 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
5951146d | 2205 | atomic_inc(&cmd->se_dev->dev_hoq_count); |
c66ac9db | 2206 | smp_mb__after_atomic_inc(); |
6708bb27 | 2207 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2208 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2209 | cmd->t_task_cdb[0], |
c66ac9db NB |
2210 | cmd->se_ordered_id); |
2211 | return 1; | |
e66ecd50 | 2212 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d AG |
2213 | spin_lock(&cmd->se_dev->ordered_cmd_lock); |
2214 | list_add_tail(&cmd->se_ordered_node, | |
2215 | &cmd->se_dev->ordered_cmd_list); | |
2216 | spin_unlock(&cmd->se_dev->ordered_cmd_lock); | |
c66ac9db | 2217 | |
5951146d | 2218 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2219 | smp_mb__after_atomic_inc(); |
2220 | ||
6708bb27 | 2221 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2222 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2223 | cmd->t_task_cdb[0], |
c66ac9db NB |
2224 | cmd->se_ordered_id); |
2225 | /* | |
2226 | * Add ORDERED command to tail of execution queue if | |
2227 | * no other older commands exist that need to be | |
2228 | * completed first. | |
2229 | */ | |
6708bb27 | 2230 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2231 | return 1; |
2232 | } else { | |
2233 | /* | |
2234 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2235 | */ | |
5951146d | 2236 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2237 | smp_mb__after_atomic_inc(); |
2238 | } | |
2239 | /* | |
2240 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2241 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2242 | * execution queue and become in Active state for this struct se_device. | |
2243 | */ | |
5951146d | 2244 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2245 | /* |
2246 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2247 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2248 | */ |
5951146d | 2249 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2250 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2251 | list_add_tail(&cmd->se_delayed_node, |
2252 | &cmd->se_dev->delayed_cmd_list); | |
2253 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2254 | |
6708bb27 | 2255 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2256 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2257 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2258 | cmd->se_ordered_id); |
2259 | /* | |
2260 | * Return zero to let transport_execute_tasks() know | |
2261 | * not to add the delayed tasks to the execution list. | |
2262 | */ | |
2263 | return 0; | |
2264 | } | |
2265 | /* | |
2266 | * Otherwise, no ORDERED task attributes exist.. | |
2267 | */ | |
2268 | return 1; | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Called from fabric module context in transport_generic_new_cmd() and | |
2273 | * transport_generic_process_write() | |
2274 | */ | |
2275 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2276 | { | |
2277 | int add_tasks; | |
2278 | ||
db1620a2 CH |
2279 | if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) { |
2280 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
2281 | transport_generic_request_failure(cmd, NULL, 0, 1); | |
2282 | return 0; | |
c66ac9db | 2283 | } |
db1620a2 | 2284 | |
c66ac9db NB |
2285 | /* |
2286 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2287 | * has occurred that prevents execution. |
c66ac9db | 2288 | */ |
6708bb27 | 2289 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2290 | /* |
2291 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2292 | * attribute for the tasks of the received struct se_cmd CDB | |
2293 | */ | |
2294 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2295 | if (!add_tasks) |
c66ac9db NB |
2296 | goto execute_tasks; |
2297 | /* | |
2298 | * This calls transport_add_tasks_from_cmd() to handle | |
2299 | * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation | |
2300 | * (if enabled) in __transport_add_task_to_execute_queue() and | |
2301 | * transport_add_task_check_sam_attr(). | |
2302 | */ | |
2303 | transport_add_tasks_from_cmd(cmd); | |
2304 | } | |
2305 | /* | |
2306 | * Kick the execution queue for the cmd associated struct se_device | |
2307 | * storage object. | |
2308 | */ | |
2309 | execute_tasks: | |
5951146d | 2310 | __transport_execute_tasks(cmd->se_dev); |
c66ac9db NB |
2311 | return 0; |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2316 | * from struct se_device->execute_task_list and | |
2317 | * | |
2318 | * Called from transport_processing_thread() | |
2319 | */ | |
2320 | static int __transport_execute_tasks(struct se_device *dev) | |
2321 | { | |
2322 | int error; | |
2323 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2324 | struct se_task *task = NULL; |
c66ac9db NB |
2325 | unsigned long flags; |
2326 | ||
2327 | /* | |
2328 | * Check if there is enough room in the device and HBA queue to send | |
a1d8b49a | 2329 | * struct se_tasks to the selected transport. |
c66ac9db NB |
2330 | */ |
2331 | check_depth: | |
e3d6f909 | 2332 | if (!atomic_read(&dev->depth_left)) |
c66ac9db | 2333 | return transport_tcq_window_closed(dev); |
c66ac9db | 2334 | |
e3d6f909 | 2335 | dev->dev_tcq_window_closed = 0; |
c66ac9db | 2336 | |
e3d6f909 AG |
2337 | spin_lock_irq(&dev->execute_task_lock); |
2338 | if (list_empty(&dev->execute_task_list)) { | |
2339 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2340 | return 0; |
2341 | } | |
e3d6f909 AG |
2342 | task = list_first_entry(&dev->execute_task_list, |
2343 | struct se_task, t_execute_list); | |
04629b7b | 2344 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2345 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db NB |
2346 | |
2347 | atomic_dec(&dev->depth_left); | |
c66ac9db | 2348 | |
e3d6f909 | 2349 | cmd = task->task_se_cmd; |
c66ac9db | 2350 | |
a1d8b49a | 2351 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2352 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2353 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2354 | |
a1d8b49a AG |
2355 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2356 | cmd->t_task_list_num) | |
c66ac9db NB |
2357 | atomic_set(&cmd->transport_sent, 1); |
2358 | ||
2359 | transport_start_task_timer(task); | |
a1d8b49a | 2360 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2361 | /* |
2362 | * The struct se_cmd->transport_emulate_cdb() function pointer is used | |
e3d6f909 | 2363 | * to grab REPORT_LUNS and other CDBs we want to handle before they hit the |
c66ac9db NB |
2364 | * struct se_subsystem_api->do_task() caller below. |
2365 | */ | |
2366 | if (cmd->transport_emulate_cdb) { | |
2367 | error = cmd->transport_emulate_cdb(cmd); | |
2368 | if (error != 0) { | |
2369 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2370 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2371 | task->task_flags &= ~TF_ACTIVE; | |
2372 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2373 | atomic_set(&cmd->transport_sent, 0); |
2374 | transport_stop_tasks_for_cmd(cmd); | |
2375 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2376 | goto check_depth; | |
2377 | } | |
2378 | /* | |
2379 | * Handle the successful completion for transport_emulate_cdb() | |
2380 | * for synchronous operation, following SCF_EMULATE_CDB_ASYNC | |
2381 | * Otherwise the caller is expected to complete the task with | |
2382 | * proper status. | |
2383 | */ | |
2384 | if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) { | |
2385 | cmd->scsi_status = SAM_STAT_GOOD; | |
2386 | task->task_scsi_status = GOOD; | |
2387 | transport_complete_task(task, 1); | |
2388 | } | |
2389 | } else { | |
2390 | /* | |
2391 | * Currently for all virtual TCM plugins including IBLOCK, FILEIO and | |
2392 | * RAMDISK we use the internal transport_emulate_control_cdb() logic | |
2393 | * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK | |
2394 | * LUN emulation code. | |
2395 | * | |
2396 | * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we | |
2397 | * call ->do_task() directly and let the underlying TCM subsystem plugin | |
2398 | * code handle the CDB emulation. | |
2399 | */ | |
e3d6f909 AG |
2400 | if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) && |
2401 | (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
c66ac9db NB |
2402 | error = transport_emulate_control_cdb(task); |
2403 | else | |
e3d6f909 | 2404 | error = dev->transport->do_task(task); |
c66ac9db NB |
2405 | |
2406 | if (error != 0) { | |
2407 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2408 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2409 | task->task_flags &= ~TF_ACTIVE; | |
2410 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2411 | atomic_set(&cmd->transport_sent, 0); |
2412 | transport_stop_tasks_for_cmd(cmd); | |
2413 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2414 | } | |
2415 | } | |
2416 | ||
2417 | goto check_depth; | |
2418 | ||
2419 | return 0; | |
2420 | } | |
2421 | ||
2422 | void transport_new_cmd_failure(struct se_cmd *se_cmd) | |
2423 | { | |
2424 | unsigned long flags; | |
2425 | /* | |
2426 | * Any unsolicited data will get dumped for failed command inside of | |
2427 | * the fabric plugin | |
2428 | */ | |
a1d8b49a | 2429 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2430 | se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED; |
2431 | se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
a1d8b49a | 2432 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2433 | } |
2434 | ||
c66ac9db NB |
2435 | static inline u32 transport_get_sectors_6( |
2436 | unsigned char *cdb, | |
2437 | struct se_cmd *cmd, | |
2438 | int *ret) | |
2439 | { | |
5951146d | 2440 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2441 | |
2442 | /* | |
2443 | * Assume TYPE_DISK for non struct se_device objects. | |
2444 | * Use 8-bit sector value. | |
2445 | */ | |
2446 | if (!dev) | |
2447 | goto type_disk; | |
2448 | ||
2449 | /* | |
2450 | * Use 24-bit allocation length for TYPE_TAPE. | |
2451 | */ | |
e3d6f909 | 2452 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2453 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2454 | ||
2455 | /* | |
2456 | * Everything else assume TYPE_DISK Sector CDB location. | |
2457 | * Use 8-bit sector value. | |
2458 | */ | |
2459 | type_disk: | |
2460 | return (u32)cdb[4]; | |
2461 | } | |
2462 | ||
2463 | static inline u32 transport_get_sectors_10( | |
2464 | unsigned char *cdb, | |
2465 | struct se_cmd *cmd, | |
2466 | int *ret) | |
2467 | { | |
5951146d | 2468 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2469 | |
2470 | /* | |
2471 | * Assume TYPE_DISK for non struct se_device objects. | |
2472 | * Use 16-bit sector value. | |
2473 | */ | |
2474 | if (!dev) | |
2475 | goto type_disk; | |
2476 | ||
2477 | /* | |
2478 | * XXX_10 is not defined in SSC, throw an exception | |
2479 | */ | |
e3d6f909 AG |
2480 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2481 | *ret = -EINVAL; | |
c66ac9db NB |
2482 | return 0; |
2483 | } | |
2484 | ||
2485 | /* | |
2486 | * Everything else assume TYPE_DISK Sector CDB location. | |
2487 | * Use 16-bit sector value. | |
2488 | */ | |
2489 | type_disk: | |
2490 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2491 | } | |
2492 | ||
2493 | static inline u32 transport_get_sectors_12( | |
2494 | unsigned char *cdb, | |
2495 | struct se_cmd *cmd, | |
2496 | int *ret) | |
2497 | { | |
5951146d | 2498 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2499 | |
2500 | /* | |
2501 | * Assume TYPE_DISK for non struct se_device objects. | |
2502 | * Use 32-bit sector value. | |
2503 | */ | |
2504 | if (!dev) | |
2505 | goto type_disk; | |
2506 | ||
2507 | /* | |
2508 | * XXX_12 is not defined in SSC, throw an exception | |
2509 | */ | |
e3d6f909 AG |
2510 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2511 | *ret = -EINVAL; | |
c66ac9db NB |
2512 | return 0; |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * Everything else assume TYPE_DISK Sector CDB location. | |
2517 | * Use 32-bit sector value. | |
2518 | */ | |
2519 | type_disk: | |
2520 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2521 | } | |
2522 | ||
2523 | static inline u32 transport_get_sectors_16( | |
2524 | unsigned char *cdb, | |
2525 | struct se_cmd *cmd, | |
2526 | int *ret) | |
2527 | { | |
5951146d | 2528 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2529 | |
2530 | /* | |
2531 | * Assume TYPE_DISK for non struct se_device objects. | |
2532 | * Use 32-bit sector value. | |
2533 | */ | |
2534 | if (!dev) | |
2535 | goto type_disk; | |
2536 | ||
2537 | /* | |
2538 | * Use 24-bit allocation length for TYPE_TAPE. | |
2539 | */ | |
e3d6f909 | 2540 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2541 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2542 | ||
2543 | type_disk: | |
2544 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2545 | (cdb[12] << 8) + cdb[13]; | |
2546 | } | |
2547 | ||
2548 | /* | |
2549 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2550 | */ | |
2551 | static inline u32 transport_get_sectors_32( | |
2552 | unsigned char *cdb, | |
2553 | struct se_cmd *cmd, | |
2554 | int *ret) | |
2555 | { | |
2556 | /* | |
2557 | * Assume TYPE_DISK for non struct se_device objects. | |
2558 | * Use 32-bit sector value. | |
2559 | */ | |
2560 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2561 | (cdb[30] << 8) + cdb[31]; | |
2562 | ||
2563 | } | |
2564 | ||
2565 | static inline u32 transport_get_size( | |
2566 | u32 sectors, | |
2567 | unsigned char *cdb, | |
2568 | struct se_cmd *cmd) | |
2569 | { | |
5951146d | 2570 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2571 | |
e3d6f909 | 2572 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2573 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2574 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2575 | } else /* bytes */ |
2576 | return sectors; | |
2577 | } | |
2578 | #if 0 | |
6708bb27 | 2579 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2580 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2581 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2582 | dev->transport->name); | |
c66ac9db | 2583 | #endif |
e3d6f909 | 2584 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2585 | } |
2586 | ||
c66ac9db NB |
2587 | static void transport_xor_callback(struct se_cmd *cmd) |
2588 | { | |
2589 | unsigned char *buf, *addr; | |
ec98f782 | 2590 | struct scatterlist *sg; |
c66ac9db NB |
2591 | unsigned int offset; |
2592 | int i; | |
ec98f782 | 2593 | int count; |
c66ac9db NB |
2594 | /* |
2595 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2596 | * | |
2597 | * 1) read the specified logical block(s); | |
2598 | * 2) transfer logical blocks from the data-out buffer; | |
2599 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2600 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2601 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2602 | * blocks transferred from the data-out buffer; and | |
2603 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2604 | */ | |
2605 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2606 | if (!buf) { |
2607 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2608 | return; |
2609 | } | |
2610 | /* | |
ec98f782 | 2611 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2612 | * into the locally allocated *buf |
2613 | */ | |
ec98f782 AG |
2614 | sg_copy_to_buffer(cmd->t_data_sg, |
2615 | cmd->t_data_nents, | |
2616 | buf, | |
2617 | cmd->data_length); | |
2618 | ||
c66ac9db NB |
2619 | /* |
2620 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2621 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2622 | */ |
2623 | ||
2624 | offset = 0; | |
ec98f782 AG |
2625 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2626 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2627 | if (!addr) | |
c66ac9db NB |
2628 | goto out; |
2629 | ||
ec98f782 AG |
2630 | for (i = 0; i < sg->length; i++) |
2631 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2632 | |
ec98f782 | 2633 | offset += sg->length; |
c66ac9db NB |
2634 | kunmap_atomic(addr, KM_USER0); |
2635 | } | |
ec98f782 | 2636 | |
c66ac9db NB |
2637 | out: |
2638 | kfree(buf); | |
2639 | } | |
2640 | ||
2641 | /* | |
2642 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2643 | */ | |
2644 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2645 | { | |
2646 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2647 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2648 | struct se_task *task = NULL, *task_tmp; |
2649 | unsigned long flags; | |
2650 | u32 offset = 0; | |
2651 | ||
e3d6f909 AG |
2652 | WARN_ON(!cmd->se_lun); |
2653 | ||
42bf829e CH |
2654 | if (!dev) |
2655 | return 0; | |
2656 | ||
a1d8b49a | 2657 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2658 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2659 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2660 | return 0; |
2661 | } | |
2662 | ||
2663 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2664 | &cmd->t_task_list, t_list) { |
c66ac9db NB |
2665 | if (!task->task_sense) |
2666 | continue; | |
2667 | ||
e3d6f909 | 2668 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2669 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2670 | " is NULL\n"); |
2671 | continue; | |
2672 | } | |
2673 | ||
e3d6f909 | 2674 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2675 | if (!sense_buffer) { |
04629b7b | 2676 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2677 | " sense buffer for task with sense\n", |
04629b7b | 2678 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2679 | continue; |
2680 | } | |
a1d8b49a | 2681 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2682 | |
e3d6f909 | 2683 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2684 | TRANSPORT_SENSE_BUFFER); |
2685 | ||
5951146d | 2686 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2687 | TRANSPORT_SENSE_BUFFER); |
2688 | cmd->scsi_status = task->task_scsi_status; | |
2689 | /* Automatically padded */ | |
2690 | cmd->scsi_sense_length = | |
2691 | (TRANSPORT_SENSE_BUFFER + offset); | |
2692 | ||
6708bb27 | 2693 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2694 | " and sense\n", |
e3d6f909 | 2695 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2696 | cmd->scsi_status); |
2697 | return 0; | |
2698 | } | |
a1d8b49a | 2699 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2700 | |
2701 | return -1; | |
2702 | } | |
2703 | ||
c66ac9db NB |
2704 | static int |
2705 | transport_handle_reservation_conflict(struct se_cmd *cmd) | |
2706 | { | |
c66ac9db NB |
2707 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2708 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2709 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
2710 | /* | |
2711 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
2712 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
2713 | * CONFLICT STATUS. | |
2714 | * | |
2715 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
2716 | */ | |
e3d6f909 AG |
2717 | if (cmd->se_sess && |
2718 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
2719 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
2720 | cmd->orig_fe_lun, 0x2C, |
2721 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
5951146d | 2722 | return -EINVAL; |
c66ac9db NB |
2723 | } |
2724 | ||
ec98f782 AG |
2725 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2726 | { | |
2727 | return dev->transport->get_blocks(dev) + 1; | |
2728 | } | |
2729 | ||
2730 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2731 | { | |
2732 | struct se_device *dev = cmd->se_dev; | |
2733 | u32 sectors; | |
2734 | ||
2735 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2736 | return 0; | |
2737 | ||
2738 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2739 | ||
6708bb27 AG |
2740 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2741 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2742 | " transport_dev_end_lba(): %llu\n", |
2743 | cmd->t_task_lba, sectors, | |
2744 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2745 | return -EINVAL; |
ec98f782 AG |
2746 | } |
2747 | ||
7abbe7f3 | 2748 | return 0; |
ec98f782 AG |
2749 | } |
2750 | ||
706d5860 NB |
2751 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2752 | { | |
2753 | /* | |
2754 | * Determine if the received WRITE_SAME is used to for direct | |
2755 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2756 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2757 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2758 | */ | |
2759 | int passthrough = (dev->transport->transport_type == | |
2760 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2761 | ||
2762 | if (!passthrough) { | |
2763 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2764 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2765 | " bits not supported for Block Discard" | |
2766 | " Emulation\n"); | |
2767 | return -ENOSYS; | |
2768 | } | |
2769 | /* | |
2770 | * Currently for the emulated case we only accept | |
2771 | * tpws with the UNMAP=1 bit set. | |
2772 | */ | |
2773 | if (!(flags[0] & 0x08)) { | |
2774 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2775 | " supported for Block Discard Emulation\n"); | |
2776 | return -ENOSYS; | |
2777 | } | |
2778 | } | |
2779 | ||
2780 | return 0; | |
2781 | } | |
2782 | ||
c66ac9db NB |
2783 | /* transport_generic_cmd_sequencer(): |
2784 | * | |
2785 | * Generic Command Sequencer that should work for most DAS transport | |
2786 | * drivers. | |
2787 | * | |
2788 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2789 | * RX Thread. | |
2790 | * | |
2791 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2792 | */ | |
2793 | static int transport_generic_cmd_sequencer( | |
2794 | struct se_cmd *cmd, | |
2795 | unsigned char *cdb) | |
2796 | { | |
5951146d | 2797 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2798 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2799 | int ret = 0, sector_ret = 0, passthrough; | |
2800 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2801 | u16 service_action; | |
2802 | u8 alua_ascq = 0; | |
2803 | /* | |
2804 | * Check for an existing UNIT ATTENTION condition | |
2805 | */ | |
2806 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2807 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2808 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2809 | return -EINVAL; |
c66ac9db NB |
2810 | } |
2811 | /* | |
2812 | * Check status of Asymmetric Logical Unit Assignment port | |
2813 | */ | |
e3d6f909 | 2814 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2815 | if (ret != 0) { |
c66ac9db | 2816 | /* |
25985edc | 2817 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2818 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2819 | * by the ALUA primary or secondary access state.. | |
2820 | */ | |
2821 | if (ret > 0) { | |
2822 | #if 0 | |
6708bb27 | 2823 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2824 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2825 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2826 | #endif |
2827 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2828 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2829 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2830 | return -EINVAL; |
c66ac9db NB |
2831 | } |
2832 | goto out_invalid_cdb_field; | |
2833 | } | |
2834 | /* | |
2835 | * Check status for SPC-3 Persistent Reservations | |
2836 | */ | |
e3d6f909 AG |
2837 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2838 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
c66ac9db NB |
2839 | cmd, cdb, pr_reg_type) != 0) |
2840 | return transport_handle_reservation_conflict(cmd); | |
2841 | /* | |
2842 | * This means the CDB is allowed for the SCSI Initiator port | |
2843 | * when said port is *NOT* holding the legacy SPC-2 or | |
2844 | * SPC-3 Persistent Reservation. | |
2845 | */ | |
2846 | } | |
2847 | ||
2848 | switch (cdb[0]) { | |
2849 | case READ_6: | |
2850 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2851 | if (sector_ret) | |
2852 | goto out_unsupported_cdb; | |
2853 | size = transport_get_size(sectors, cdb, cmd); | |
2854 | cmd->transport_split_cdb = &split_cdb_XX_6; | |
a1d8b49a | 2855 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2856 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2857 | break; | |
2858 | case READ_10: | |
2859 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2860 | if (sector_ret) | |
2861 | goto out_unsupported_cdb; | |
2862 | size = transport_get_size(sectors, cdb, cmd); | |
2863 | cmd->transport_split_cdb = &split_cdb_XX_10; | |
a1d8b49a | 2864 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2865 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2866 | break; | |
2867 | case READ_12: | |
2868 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2869 | if (sector_ret) | |
2870 | goto out_unsupported_cdb; | |
2871 | size = transport_get_size(sectors, cdb, cmd); | |
2872 | cmd->transport_split_cdb = &split_cdb_XX_12; | |
a1d8b49a | 2873 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2874 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2875 | break; | |
2876 | case READ_16: | |
2877 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2878 | if (sector_ret) | |
2879 | goto out_unsupported_cdb; | |
2880 | size = transport_get_size(sectors, cdb, cmd); | |
2881 | cmd->transport_split_cdb = &split_cdb_XX_16; | |
a1d8b49a | 2882 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2883 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2884 | break; | |
2885 | case WRITE_6: | |
2886 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2887 | if (sector_ret) | |
2888 | goto out_unsupported_cdb; | |
2889 | size = transport_get_size(sectors, cdb, cmd); | |
2890 | cmd->transport_split_cdb = &split_cdb_XX_6; | |
a1d8b49a | 2891 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2892 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2893 | break; | |
2894 | case WRITE_10: | |
2895 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2896 | if (sector_ret) | |
2897 | goto out_unsupported_cdb; | |
2898 | size = transport_get_size(sectors, cdb, cmd); | |
2899 | cmd->transport_split_cdb = &split_cdb_XX_10; | |
a1d8b49a AG |
2900 | cmd->t_task_lba = transport_lba_32(cdb); |
2901 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2902 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2903 | break; | |
2904 | case WRITE_12: | |
2905 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2906 | if (sector_ret) | |
2907 | goto out_unsupported_cdb; | |
2908 | size = transport_get_size(sectors, cdb, cmd); | |
2909 | cmd->transport_split_cdb = &split_cdb_XX_12; | |
a1d8b49a AG |
2910 | cmd->t_task_lba = transport_lba_32(cdb); |
2911 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2912 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2913 | break; | |
2914 | case WRITE_16: | |
2915 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2916 | if (sector_ret) | |
2917 | goto out_unsupported_cdb; | |
2918 | size = transport_get_size(sectors, cdb, cmd); | |
2919 | cmd->transport_split_cdb = &split_cdb_XX_16; | |
a1d8b49a AG |
2920 | cmd->t_task_lba = transport_lba_64(cdb); |
2921 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2922 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2923 | break; | |
2924 | case XDWRITEREAD_10: | |
2925 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
a1d8b49a | 2926 | !(cmd->t_tasks_bidi)) |
c66ac9db NB |
2927 | goto out_invalid_cdb_field; |
2928 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2929 | if (sector_ret) | |
2930 | goto out_unsupported_cdb; | |
2931 | size = transport_get_size(sectors, cdb, cmd); | |
2932 | cmd->transport_split_cdb = &split_cdb_XX_10; | |
a1d8b49a | 2933 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2934 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
e3d6f909 | 2935 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2936 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2937 | /* | |
2938 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2939 | */ | |
2940 | if (passthrough) | |
2941 | break; | |
2942 | /* | |
2943 | * Setup BIDI XOR callback to be run during transport_generic_complete_ok() | |
2944 | */ | |
2945 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2946 | cmd->t_tasks_fua = (cdb[1] & 0x8); |
c66ac9db NB |
2947 | break; |
2948 | case VARIABLE_LENGTH_CMD: | |
2949 | service_action = get_unaligned_be16(&cdb[8]); | |
2950 | /* | |
2951 | * Determine if this is TCM/PSCSI device and we should disable | |
2952 | * internal emulation for this CDB. | |
2953 | */ | |
e3d6f909 | 2954 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2955 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2956 | ||
2957 | switch (service_action) { | |
2958 | case XDWRITEREAD_32: | |
2959 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2960 | if (sector_ret) | |
2961 | goto out_unsupported_cdb; | |
2962 | size = transport_get_size(sectors, cdb, cmd); | |
2963 | /* | |
2964 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2965 | * XDWRITE_READ_32 logic. | |
2966 | */ | |
2967 | cmd->transport_split_cdb = &split_cdb_XX_32; | |
a1d8b49a | 2968 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2969 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2970 | ||
2971 | /* | |
2972 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2973 | */ | |
2974 | if (passthrough) | |
2975 | break; | |
2976 | ||
2977 | /* | |
2978 | * Setup BIDI XOR callback to be run during | |
2979 | * transport_generic_complete_ok() | |
2980 | */ | |
2981 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2982 | cmd->t_tasks_fua = (cdb[10] & 0x8); |
c66ac9db NB |
2983 | break; |
2984 | case WRITE_SAME_32: | |
2985 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2986 | if (sector_ret) | |
2987 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2988 | |
6708bb27 | 2989 | if (sectors) |
12850626 | 2990 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2991 | else { |
2992 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2993 | " supported\n"); | |
2994 | goto out_invalid_cdb_field; | |
2995 | } | |
dd3a5ad8 | 2996 | |
a1d8b49a | 2997 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2998 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2999 | ||
706d5860 | 3000 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
c66ac9db | 3001 | goto out_invalid_cdb_field; |
706d5860 | 3002 | |
c66ac9db NB |
3003 | break; |
3004 | default: | |
6708bb27 | 3005 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
3006 | " 0x%04x not supported\n", service_action); |
3007 | goto out_unsupported_cdb; | |
3008 | } | |
3009 | break; | |
e434f1f1 | 3010 | case MAINTENANCE_IN: |
e3d6f909 | 3011 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
3012 | /* MAINTENANCE_IN from SCC-2 */ |
3013 | /* | |
3014 | * Check for emulated MI_REPORT_TARGET_PGS. | |
3015 | */ | |
3016 | if (cdb[1] == MI_REPORT_TARGET_PGS) { | |
3017 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3018 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3019 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3020 | core_emulate_report_target_port_groups : |
c66ac9db NB |
3021 | NULL; |
3022 | } | |
3023 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3024 | (cdb[8] << 8) | cdb[9]; | |
3025 | } else { | |
3026 | /* GPCMD_SEND_KEY from multi media commands */ | |
3027 | size = (cdb[8] << 8) + cdb[9]; | |
3028 | } | |
05d1c7c0 | 3029 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3030 | break; |
3031 | case MODE_SELECT: | |
3032 | size = cdb[4]; | |
3033 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3034 | break; | |
3035 | case MODE_SELECT_10: | |
3036 | size = (cdb[7] << 8) + cdb[8]; | |
3037 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3038 | break; | |
3039 | case MODE_SENSE: | |
3040 | size = cdb[4]; | |
05d1c7c0 | 3041 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3042 | break; |
3043 | case MODE_SENSE_10: | |
3044 | case GPCMD_READ_BUFFER_CAPACITY: | |
3045 | case GPCMD_SEND_OPC: | |
3046 | case LOG_SELECT: | |
3047 | case LOG_SENSE: | |
3048 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3049 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3050 | break; |
3051 | case READ_BLOCK_LIMITS: | |
3052 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 3053 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3054 | break; |
3055 | case GPCMD_GET_CONFIGURATION: | |
3056 | case GPCMD_READ_FORMAT_CAPACITIES: | |
3057 | case GPCMD_READ_DISC_INFO: | |
3058 | case GPCMD_READ_TRACK_RZONE_INFO: | |
3059 | size = (cdb[7] << 8) + cdb[8]; | |
3060 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3061 | break; | |
3062 | case PERSISTENT_RESERVE_IN: | |
3063 | case PERSISTENT_RESERVE_OUT: | |
3064 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3065 | (su_dev->t10_pr.res_type == |
c66ac9db | 3066 | SPC3_PERSISTENT_RESERVATIONS) ? |
e3d6f909 | 3067 | core_scsi3_emulate_pr : NULL; |
c66ac9db | 3068 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 3069 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3070 | break; |
3071 | case GPCMD_MECHANISM_STATUS: | |
3072 | case GPCMD_READ_DVD_STRUCTURE: | |
3073 | size = (cdb[8] << 8) + cdb[9]; | |
3074 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3075 | break; | |
3076 | case READ_POSITION: | |
3077 | size = READ_POSITION_LEN; | |
05d1c7c0 | 3078 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 3079 | break; |
e434f1f1 | 3080 | case MAINTENANCE_OUT: |
e3d6f909 | 3081 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
3082 | /* MAINTENANCE_OUT from SCC-2 |
3083 | * | |
3084 | * Check for emulated MO_SET_TARGET_PGS. | |
3085 | */ | |
3086 | if (cdb[1] == MO_SET_TARGET_PGS) { | |
3087 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3088 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3089 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3090 | core_emulate_set_target_port_groups : |
c66ac9db NB |
3091 | NULL; |
3092 | } | |
3093 | ||
3094 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3095 | (cdb[8] << 8) | cdb[9]; | |
3096 | } else { | |
3097 | /* GPCMD_REPORT_KEY from multi media commands */ | |
3098 | size = (cdb[8] << 8) + cdb[9]; | |
3099 | } | |
05d1c7c0 | 3100 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3101 | break; |
3102 | case INQUIRY: | |
3103 | size = (cdb[3] << 8) + cdb[4]; | |
3104 | /* | |
3105 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
3106 | * See spc4r17 section 5.3 | |
3107 | */ | |
5951146d | 3108 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3109 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3110 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3111 | break; |
3112 | case READ_BUFFER: | |
3113 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3114 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3115 | break; |
3116 | case READ_CAPACITY: | |
3117 | size = READ_CAP_LEN; | |
05d1c7c0 | 3118 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3119 | break; |
3120 | case READ_MEDIA_SERIAL_NUMBER: | |
3121 | case SECURITY_PROTOCOL_IN: | |
3122 | case SECURITY_PROTOCOL_OUT: | |
3123 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 3124 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3125 | break; |
3126 | case SERVICE_ACTION_IN: | |
3127 | case ACCESS_CONTROL_IN: | |
3128 | case ACCESS_CONTROL_OUT: | |
3129 | case EXTENDED_COPY: | |
3130 | case READ_ATTRIBUTE: | |
3131 | case RECEIVE_COPY_RESULTS: | |
3132 | case WRITE_ATTRIBUTE: | |
3133 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
3134 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 3135 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3136 | break; |
3137 | case RECEIVE_DIAGNOSTIC: | |
3138 | case SEND_DIAGNOSTIC: | |
3139 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 3140 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3141 | break; |
3142 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
3143 | #if 0 | |
3144 | case GPCMD_READ_CD: | |
3145 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
3146 | size = (2336 * sectors); | |
05d1c7c0 | 3147 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3148 | break; |
3149 | #endif | |
3150 | case READ_TOC: | |
3151 | size = cdb[8]; | |
05d1c7c0 | 3152 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3153 | break; |
3154 | case REQUEST_SENSE: | |
3155 | size = cdb[4]; | |
05d1c7c0 | 3156 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3157 | break; |
3158 | case READ_ELEMENT_STATUS: | |
3159 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 3160 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3161 | break; |
3162 | case WRITE_BUFFER: | |
3163 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3164 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3165 | break; |
3166 | case RESERVE: | |
3167 | case RESERVE_10: | |
3168 | /* | |
3169 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
3170 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3171 | */ | |
3172 | if (cdb[0] == RESERVE_10) | |
3173 | size = (cdb[7] << 8) | cdb[8]; | |
3174 | else | |
3175 | size = cmd->data_length; | |
3176 | ||
3177 | /* | |
3178 | * Setup the legacy emulated handler for SPC-2 and | |
3179 | * >= SPC-3 compatible reservation handling (CRH=1) | |
3180 | * Otherwise, we assume the underlying SCSI logic is | |
3181 | * is running in SPC_PASSTHROUGH, and wants reservations | |
3182 | * emulation disabled. | |
3183 | */ | |
3184 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3185 | (su_dev->t10_pr.res_type != |
c66ac9db | 3186 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3187 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3188 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3189 | break; | |
3190 | case RELEASE: | |
3191 | case RELEASE_10: | |
3192 | /* | |
3193 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
3194 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3195 | */ | |
3196 | if (cdb[0] == RELEASE_10) | |
3197 | size = (cdb[7] << 8) | cdb[8]; | |
3198 | else | |
3199 | size = cmd->data_length; | |
3200 | ||
3201 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3202 | (su_dev->t10_pr.res_type != |
c66ac9db | 3203 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3204 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3205 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3206 | break; | |
3207 | case SYNCHRONIZE_CACHE: | |
3208 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
3209 | /* | |
3210 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
3211 | */ | |
3212 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
3213 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 3214 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
3215 | } else { |
3216 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 3217 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
3218 | } |
3219 | if (sector_ret) | |
3220 | goto out_unsupported_cdb; | |
3221 | ||
3222 | size = transport_get_size(sectors, cdb, cmd); | |
3223 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3224 | ||
3225 | /* | |
3226 | * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb() | |
3227 | */ | |
e3d6f909 | 3228 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
c66ac9db NB |
3229 | break; |
3230 | /* | |
3231 | * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation | |
3232 | * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks() | |
3233 | */ | |
3234 | cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC; | |
3235 | /* | |
3236 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 3237 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 3238 | */ |
7abbe7f3 NB |
3239 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
3240 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3241 | goto out_invalid_cdb_field; | |
3242 | } | |
c66ac9db NB |
3243 | break; |
3244 | case UNMAP: | |
3245 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 3246 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3247 | break; |
3248 | case WRITE_SAME_16: | |
3249 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
3250 | if (sector_ret) | |
3251 | goto out_unsupported_cdb; | |
dd3a5ad8 | 3252 | |
6708bb27 | 3253 | if (sectors) |
12850626 | 3254 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
3255 | else { |
3256 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3257 | goto out_invalid_cdb_field; | |
3258 | } | |
dd3a5ad8 | 3259 | |
5db0753b | 3260 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
3261 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
3262 | ||
3263 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3264 | goto out_invalid_cdb_field; | |
3265 | break; | |
3266 | case WRITE_SAME: | |
3267 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
3268 | if (sector_ret) | |
3269 | goto out_unsupported_cdb; | |
3270 | ||
3271 | if (sectors) | |
12850626 | 3272 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
3273 | else { |
3274 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3275 | goto out_invalid_cdb_field; | |
c66ac9db | 3276 | } |
706d5860 NB |
3277 | |
3278 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3279 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3280 | /* |
3281 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3282 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3283 | */ | |
3284 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3285 | goto out_invalid_cdb_field; | |
c66ac9db NB |
3286 | break; |
3287 | case ALLOW_MEDIUM_REMOVAL: | |
3288 | case GPCMD_CLOSE_TRACK: | |
3289 | case ERASE: | |
3290 | case INITIALIZE_ELEMENT_STATUS: | |
3291 | case GPCMD_LOAD_UNLOAD: | |
3292 | case REZERO_UNIT: | |
3293 | case SEEK_10: | |
3294 | case GPCMD_SET_SPEED: | |
3295 | case SPACE: | |
3296 | case START_STOP: | |
3297 | case TEST_UNIT_READY: | |
3298 | case VERIFY: | |
3299 | case WRITE_FILEMARKS: | |
3300 | case MOVE_MEDIUM: | |
3301 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3302 | break; | |
3303 | case REPORT_LUNS: | |
3304 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3305 | transport_core_report_lun_response; |
c66ac9db NB |
3306 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3307 | /* | |
3308 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3309 | * See spc4r17 section 5.3 | |
3310 | */ | |
5951146d | 3311 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3312 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3313 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3314 | break; |
3315 | default: | |
6708bb27 | 3316 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3317 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3318 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3319 | goto out_unsupported_cdb; |
3320 | } | |
3321 | ||
3322 | if (size != cmd->data_length) { | |
6708bb27 | 3323 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3324 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3325 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3326 | cmd->data_length, size, cdb[0]); |
3327 | ||
3328 | cmd->cmd_spdtl = size; | |
3329 | ||
3330 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3331 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3332 | " WRITE data\n"); |
3333 | goto out_invalid_cdb_field; | |
3334 | } | |
3335 | /* | |
3336 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3337 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3338 | */ | |
6708bb27 AG |
3339 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3340 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3341 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3342 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3343 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3344 | goto out_invalid_cdb_field; | |
3345 | } | |
3346 | ||
3347 | if (size > cmd->data_length) { | |
3348 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3349 | cmd->residual_count = (size - cmd->data_length); | |
3350 | } else { | |
3351 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3352 | cmd->residual_count = (cmd->data_length - size); | |
3353 | } | |
3354 | cmd->data_length = size; | |
3355 | } | |
3356 | ||
d0229ae3 AG |
3357 | /* Let's limit control cdbs to a page, for simplicity's sake. */ |
3358 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3359 | size > PAGE_SIZE) | |
3360 | goto out_invalid_cdb_field; | |
3361 | ||
c66ac9db NB |
3362 | transport_set_supported_SAM_opcode(cmd); |
3363 | return ret; | |
3364 | ||
3365 | out_unsupported_cdb: | |
3366 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3367 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3368 | return -EINVAL; |
c66ac9db NB |
3369 | out_invalid_cdb_field: |
3370 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3371 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3372 | return -EINVAL; |
c66ac9db NB |
3373 | } |
3374 | ||
c66ac9db NB |
3375 | /* |
3376 | * Called from transport_generic_complete_ok() and | |
3377 | * transport_generic_request_failure() to determine which dormant/delayed | |
3378 | * and ordered cmds need to have their tasks added to the execution queue. | |
3379 | */ | |
3380 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3381 | { | |
5951146d | 3382 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3383 | struct se_cmd *cmd_p, *cmd_tmp; |
3384 | int new_active_tasks = 0; | |
3385 | ||
e66ecd50 | 3386 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3387 | atomic_dec(&dev->simple_cmds); |
3388 | smp_mb__after_atomic_dec(); | |
3389 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3390 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3391 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3392 | cmd->se_ordered_id); | |
e66ecd50 | 3393 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
3394 | atomic_dec(&dev->dev_hoq_count); |
3395 | smp_mb__after_atomic_dec(); | |
3396 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3397 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3398 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3399 | cmd->se_ordered_id); | |
e66ecd50 | 3400 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db | 3401 | spin_lock(&dev->ordered_cmd_lock); |
5951146d | 3402 | list_del(&cmd->se_ordered_node); |
c66ac9db NB |
3403 | atomic_dec(&dev->dev_ordered_sync); |
3404 | smp_mb__after_atomic_dec(); | |
3405 | spin_unlock(&dev->ordered_cmd_lock); | |
3406 | ||
3407 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3408 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3409 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3410 | } | |
3411 | /* | |
3412 | * Process all commands up to the last received | |
3413 | * ORDERED task attribute which requires another blocking | |
3414 | * boundary | |
3415 | */ | |
3416 | spin_lock(&dev->delayed_cmd_lock); | |
3417 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3418 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3419 | |
5951146d | 3420 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3421 | spin_unlock(&dev->delayed_cmd_lock); |
3422 | ||
6708bb27 | 3423 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3424 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3425 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3426 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3427 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3428 | ||
3429 | transport_add_tasks_from_cmd(cmd_p); | |
3430 | new_active_tasks++; | |
3431 | ||
3432 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3433 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3434 | break; |
3435 | } | |
3436 | spin_unlock(&dev->delayed_cmd_lock); | |
3437 | /* | |
3438 | * If new tasks have become active, wake up the transport thread | |
3439 | * to do the processing of the Active tasks. | |
3440 | */ | |
3441 | if (new_active_tasks != 0) | |
e3d6f909 | 3442 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3443 | } |
3444 | ||
07bde79a NB |
3445 | static int transport_complete_qf(struct se_cmd *cmd) |
3446 | { | |
3447 | int ret = 0; | |
3448 | ||
3449 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
3450 | return cmd->se_tfo->queue_status(cmd); | |
3451 | ||
3452 | switch (cmd->data_direction) { | |
3453 | case DMA_FROM_DEVICE: | |
3454 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3455 | break; | |
3456 | case DMA_TO_DEVICE: | |
ec98f782 | 3457 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3458 | ret = cmd->se_tfo->queue_data_in(cmd); |
3459 | if (ret < 0) | |
3460 | return ret; | |
3461 | } | |
3462 | /* Fall through for DMA_TO_DEVICE */ | |
3463 | case DMA_NONE: | |
3464 | ret = cmd->se_tfo->queue_status(cmd); | |
3465 | break; | |
3466 | default: | |
3467 | break; | |
3468 | } | |
3469 | ||
3470 | return ret; | |
3471 | } | |
3472 | ||
3473 | static void transport_handle_queue_full( | |
3474 | struct se_cmd *cmd, | |
3475 | struct se_device *dev, | |
3476 | int (*qf_callback)(struct se_cmd *)) | |
3477 | { | |
3478 | spin_lock_irq(&dev->qf_cmd_lock); | |
3479 | cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL; | |
3480 | cmd->transport_qf_callback = qf_callback; | |
3481 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); | |
3482 | atomic_inc(&dev->dev_qf_count); | |
3483 | smp_mb__after_atomic_inc(); | |
3484 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3485 | ||
3486 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3487 | } | |
3488 | ||
c66ac9db NB |
3489 | static void transport_generic_complete_ok(struct se_cmd *cmd) |
3490 | { | |
07bde79a | 3491 | int reason = 0, ret; |
c66ac9db NB |
3492 | /* |
3493 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3494 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3495 | * Attribute. | |
3496 | */ | |
5951146d | 3497 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3498 | transport_complete_task_attr(cmd); |
07bde79a NB |
3499 | /* |
3500 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3501 | * cmd->transport_qf_callback() | |
3502 | */ | |
3503 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3504 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3505 | ||
3506 | if (cmd->transport_qf_callback) { | |
3507 | ret = cmd->transport_qf_callback(cmd); | |
3508 | if (ret < 0) | |
3509 | goto queue_full; | |
3510 | ||
3511 | cmd->transport_qf_callback = NULL; | |
3512 | goto done; | |
3513 | } | |
c66ac9db NB |
3514 | /* |
3515 | * Check if we need to retrieve a sense buffer from | |
3516 | * the struct se_cmd in question. | |
3517 | */ | |
3518 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3519 | if (transport_get_sense_data(cmd) < 0) | |
3520 | reason = TCM_NON_EXISTENT_LUN; | |
3521 | ||
3522 | /* | |
3523 | * Only set when an struct se_task->task_scsi_status returned | |
3524 | * a non GOOD status. | |
3525 | */ | |
3526 | if (cmd->scsi_status) { | |
07bde79a | 3527 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3528 | cmd, reason, 1); |
07bde79a NB |
3529 | if (ret == -EAGAIN) |
3530 | goto queue_full; | |
3531 | ||
c66ac9db NB |
3532 | transport_lun_remove_cmd(cmd); |
3533 | transport_cmd_check_stop_to_fabric(cmd); | |
3534 | return; | |
3535 | } | |
3536 | } | |
3537 | /* | |
25985edc | 3538 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3539 | * XDWRITE_READ_10 emulation. |
3540 | */ | |
3541 | if (cmd->transport_complete_callback) | |
3542 | cmd->transport_complete_callback(cmd); | |
3543 | ||
3544 | switch (cmd->data_direction) { | |
3545 | case DMA_FROM_DEVICE: | |
3546 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3547 | if (cmd->se_lun->lun_sep) { |
3548 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3549 | cmd->data_length; |
3550 | } | |
3551 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3552 | |
07bde79a NB |
3553 | ret = cmd->se_tfo->queue_data_in(cmd); |
3554 | if (ret == -EAGAIN) | |
3555 | goto queue_full; | |
c66ac9db NB |
3556 | break; |
3557 | case DMA_TO_DEVICE: | |
3558 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3559 | if (cmd->se_lun->lun_sep) { |
3560 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3561 | cmd->data_length; |
3562 | } | |
3563 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3564 | /* | |
3565 | * Check if we need to send READ payload for BIDI-COMMAND | |
3566 | */ | |
ec98f782 | 3567 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3568 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3569 | if (cmd->se_lun->lun_sep) { |
3570 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3571 | cmd->data_length; |
3572 | } | |
3573 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a NB |
3574 | ret = cmd->se_tfo->queue_data_in(cmd); |
3575 | if (ret == -EAGAIN) | |
3576 | goto queue_full; | |
c66ac9db NB |
3577 | break; |
3578 | } | |
3579 | /* Fall through for DMA_TO_DEVICE */ | |
3580 | case DMA_NONE: | |
07bde79a NB |
3581 | ret = cmd->se_tfo->queue_status(cmd); |
3582 | if (ret == -EAGAIN) | |
3583 | goto queue_full; | |
c66ac9db NB |
3584 | break; |
3585 | default: | |
3586 | break; | |
3587 | } | |
3588 | ||
07bde79a | 3589 | done: |
c66ac9db NB |
3590 | transport_lun_remove_cmd(cmd); |
3591 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3592 | return; |
3593 | ||
3594 | queue_full: | |
6708bb27 | 3595 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a NB |
3596 | " data_direction: %d\n", cmd, cmd->data_direction); |
3597 | transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf); | |
c66ac9db NB |
3598 | } |
3599 | ||
3600 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3601 | { | |
3602 | struct se_task *task, *task_tmp; | |
3603 | unsigned long flags; | |
3604 | ||
a1d8b49a | 3605 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3606 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3607 | &cmd->t_task_list, t_list) { |
6c76bf95 | 3608 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
3609 | continue; |
3610 | ||
3611 | kfree(task->task_sg_bidi); | |
3612 | kfree(task->task_sg); | |
3613 | ||
3614 | list_del(&task->t_list); | |
3615 | ||
a1d8b49a | 3616 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
42bf829e | 3617 | cmd->se_dev->transport->free_task(task); |
a1d8b49a | 3618 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3619 | } |
a1d8b49a | 3620 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3621 | } |
3622 | ||
6708bb27 | 3623 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3624 | { |
ec98f782 | 3625 | struct scatterlist *sg; |
ec98f782 | 3626 | int count; |
c66ac9db | 3627 | |
6708bb27 AG |
3628 | for_each_sg(sgl, sg, nents, count) |
3629 | __free_page(sg_page(sg)); | |
c66ac9db | 3630 | |
6708bb27 AG |
3631 | kfree(sgl); |
3632 | } | |
c66ac9db | 3633 | |
6708bb27 AG |
3634 | static inline void transport_free_pages(struct se_cmd *cmd) |
3635 | { | |
3636 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3637 | return; | |
3638 | ||
3639 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3640 | cmd->t_data_sg = NULL; |
3641 | cmd->t_data_nents = 0; | |
c66ac9db | 3642 | |
6708bb27 | 3643 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3644 | cmd->t_bidi_data_sg = NULL; |
3645 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3646 | } |
3647 | ||
d3df7825 CH |
3648 | /** |
3649 | * transport_put_cmd - release a reference to a command | |
3650 | * @cmd: command to release | |
3651 | * | |
3652 | * This routine releases our reference to the command and frees it if possible. | |
3653 | */ | |
39c05f32 | 3654 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3655 | { |
3656 | unsigned long flags; | |
4911e3cc | 3657 | int free_tasks = 0; |
c66ac9db | 3658 | |
a1d8b49a | 3659 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3660 | if (atomic_read(&cmd->t_fe_count)) { |
3661 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3662 | goto out_busy; | |
3663 | } | |
3664 | ||
3665 | if (atomic_read(&cmd->t_se_count)) { | |
3666 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3667 | goto out_busy; | |
3668 | } | |
3669 | ||
3670 | if (atomic_read(&cmd->transport_dev_active)) { | |
3671 | atomic_set(&cmd->transport_dev_active, 0); | |
3672 | transport_all_task_dev_remove_state(cmd); | |
3673 | free_tasks = 1; | |
c66ac9db | 3674 | } |
a1d8b49a | 3675 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3676 | |
4911e3cc CH |
3677 | if (free_tasks != 0) |
3678 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3679 | |
c66ac9db | 3680 | transport_free_pages(cmd); |
31afc39c | 3681 | transport_release_cmd(cmd); |
39c05f32 | 3682 | return; |
4911e3cc CH |
3683 | out_busy: |
3684 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3685 | } |
3686 | ||
c66ac9db | 3687 | /* |
ec98f782 AG |
3688 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3689 | * allocating in the core. | |
c66ac9db NB |
3690 | * @cmd: Associated se_cmd descriptor |
3691 | * @mem: SGL style memory for TCM WRITE / READ | |
3692 | * @sg_mem_num: Number of SGL elements | |
3693 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3694 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3695 | * | |
3696 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3697 | * of parameters. | |
3698 | */ | |
3699 | int transport_generic_map_mem_to_cmd( | |
3700 | struct se_cmd *cmd, | |
5951146d AG |
3701 | struct scatterlist *sgl, |
3702 | u32 sgl_count, | |
3703 | struct scatterlist *sgl_bidi, | |
3704 | u32 sgl_bidi_count) | |
c66ac9db | 3705 | { |
5951146d | 3706 | if (!sgl || !sgl_count) |
c66ac9db | 3707 | return 0; |
c66ac9db | 3708 | |
c66ac9db NB |
3709 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3710 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
c66ac9db | 3711 | |
ec98f782 AG |
3712 | cmd->t_data_sg = sgl; |
3713 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3714 | |
ec98f782 AG |
3715 | if (sgl_bidi && sgl_bidi_count) { |
3716 | cmd->t_bidi_data_sg = sgl_bidi; | |
3717 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3718 | } |
3719 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3720 | } |
3721 | ||
3722 | return 0; | |
3723 | } | |
3724 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3725 | ||
c66ac9db NB |
3726 | static int transport_new_cmd_obj(struct se_cmd *cmd) |
3727 | { | |
5951146d | 3728 | struct se_device *dev = cmd->se_dev; |
01cde4d5 | 3729 | int set_counts = 1, rc, task_cdbs; |
c66ac9db | 3730 | |
ec98f782 AG |
3731 | /* |
3732 | * Setup any BIDI READ tasks and memory from | |
3733 | * cmd->t_mem_bidi_list so the READ struct se_tasks | |
3734 | * are queued first for the non pSCSI passthrough case. | |
3735 | */ | |
3736 | if (cmd->t_bidi_data_sg && | |
3737 | (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) { | |
3738 | rc = transport_allocate_tasks(cmd, | |
3739 | cmd->t_task_lba, | |
3740 | DMA_FROM_DEVICE, | |
3741 | cmd->t_bidi_data_sg, | |
3742 | cmd->t_bidi_data_nents); | |
6708bb27 | 3743 | if (rc <= 0) { |
c66ac9db NB |
3744 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3745 | cmd->scsi_sense_reason = | |
ec98f782 | 3746 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
01cde4d5 | 3747 | return -EINVAL; |
c66ac9db | 3748 | } |
ec98f782 AG |
3749 | atomic_inc(&cmd->t_fe_count); |
3750 | atomic_inc(&cmd->t_se_count); | |
3751 | set_counts = 0; | |
3752 | } | |
3753 | /* | |
3754 | * Setup the tasks and memory from cmd->t_mem_list | |
3755 | * Note for BIDI transfers this will contain the WRITE payload | |
3756 | */ | |
3757 | task_cdbs = transport_allocate_tasks(cmd, | |
3758 | cmd->t_task_lba, | |
3759 | cmd->data_direction, | |
3760 | cmd->t_data_sg, | |
3761 | cmd->t_data_nents); | |
6708bb27 | 3762 | if (task_cdbs <= 0) { |
ec98f782 AG |
3763 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3764 | cmd->scsi_sense_reason = | |
3765 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
01cde4d5 | 3766 | return -EINVAL; |
ec98f782 | 3767 | } |
c66ac9db | 3768 | |
ec98f782 AG |
3769 | if (set_counts) { |
3770 | atomic_inc(&cmd->t_fe_count); | |
3771 | atomic_inc(&cmd->t_se_count); | |
c66ac9db NB |
3772 | } |
3773 | ||
ec98f782 AG |
3774 | cmd->t_task_list_num = task_cdbs; |
3775 | ||
a1d8b49a AG |
3776 | atomic_set(&cmd->t_task_cdbs_left, task_cdbs); |
3777 | atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs); | |
3778 | atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs); | |
c66ac9db NB |
3779 | return 0; |
3780 | } | |
3781 | ||
05d1c7c0 AG |
3782 | void *transport_kmap_first_data_page(struct se_cmd *cmd) |
3783 | { | |
ec98f782 | 3784 | struct scatterlist *sg = cmd->t_data_sg; |
05d1c7c0 | 3785 | |
ec98f782 | 3786 | BUG_ON(!sg); |
05d1c7c0 | 3787 | /* |
ec98f782 AG |
3788 | * We need to take into account a possible offset here for fabrics like |
3789 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3790 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3791 | */ |
ec98f782 | 3792 | return kmap(sg_page(sg)) + sg->offset; |
05d1c7c0 AG |
3793 | } |
3794 | EXPORT_SYMBOL(transport_kmap_first_data_page); | |
3795 | ||
3796 | void transport_kunmap_first_data_page(struct se_cmd *cmd) | |
3797 | { | |
ec98f782 | 3798 | kunmap(sg_page(cmd->t_data_sg)); |
05d1c7c0 AG |
3799 | } |
3800 | EXPORT_SYMBOL(transport_kunmap_first_data_page); | |
3801 | ||
c66ac9db | 3802 | static int |
05d1c7c0 | 3803 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3804 | { |
ec98f782 AG |
3805 | u32 length = cmd->data_length; |
3806 | unsigned int nents; | |
3807 | struct page *page; | |
3808 | int i = 0; | |
c66ac9db | 3809 | |
ec98f782 AG |
3810 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3811 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3812 | if (!cmd->t_data_sg) | |
3813 | return -ENOMEM; | |
c66ac9db | 3814 | |
ec98f782 AG |
3815 | cmd->t_data_nents = nents; |
3816 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3817 | |
ec98f782 AG |
3818 | while (length) { |
3819 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
3820 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
3821 | if (!page) | |
3822 | goto out; | |
c66ac9db | 3823 | |
ec98f782 AG |
3824 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3825 | length -= page_len; | |
3826 | i++; | |
c66ac9db | 3827 | } |
c66ac9db | 3828 | return 0; |
c66ac9db | 3829 | |
ec98f782 AG |
3830 | out: |
3831 | while (i >= 0) { | |
3832 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3833 | i--; | |
c66ac9db | 3834 | } |
ec98f782 AG |
3835 | kfree(cmd->t_data_sg); |
3836 | cmd->t_data_sg = NULL; | |
3837 | return -ENOMEM; | |
c66ac9db NB |
3838 | } |
3839 | ||
a1d8b49a AG |
3840 | /* Reduce sectors if they are too long for the device */ |
3841 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3842 | struct se_device *dev, |
3843 | unsigned long long lba, | |
a1d8b49a | 3844 | sector_t sectors) |
c66ac9db | 3845 | { |
a1d8b49a | 3846 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3847 | |
a1d8b49a AG |
3848 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3849 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3850 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3851 | |
a1d8b49a | 3852 | return sectors; |
c66ac9db NB |
3853 | } |
3854 | ||
c66ac9db NB |
3855 | |
3856 | /* | |
3857 | * This function can be used by HW target mode drivers to create a linked | |
3858 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3859 | * This is intended to be called during the completion path by TCM Core | |
3860 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3861 | */ | |
3862 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3863 | { | |
ec98f782 AG |
3864 | struct scatterlist *sg_first = NULL; |
3865 | struct scatterlist *sg_prev = NULL; | |
3866 | int sg_prev_nents = 0; | |
3867 | struct scatterlist *sg; | |
c66ac9db | 3868 | struct se_task *task; |
ec98f782 | 3869 | u32 chained_nents = 0; |
c66ac9db NB |
3870 | int i; |
3871 | ||
ec98f782 AG |
3872 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3873 | ||
c66ac9db NB |
3874 | /* |
3875 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3876 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3877 | */ |
a1d8b49a | 3878 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3879 | if (!task->task_sg) |
c66ac9db NB |
3880 | continue; |
3881 | ||
ec98f782 AG |
3882 | if (!sg_first) { |
3883 | sg_first = task->task_sg; | |
6708bb27 | 3884 | chained_nents = task->task_sg_nents; |
97868c89 | 3885 | } else { |
ec98f782 | 3886 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3887 | chained_nents += task->task_sg_nents; |
97868c89 | 3888 | } |
c3c74c7a NB |
3889 | /* |
3890 | * For the padded tasks, use the extra SGL vector allocated | |
3891 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3892 | * offset into sg_chain() above. |
3893 | * | |
3894 | * We do not need the padding for the last task (or a single | |
3895 | * task), but in that case we will never use the sg_prev_nents | |
3896 | * value below which would be incorrect. | |
c3c74c7a | 3897 | */ |
04629b7b | 3898 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3899 | sg_prev = task->task_sg; |
c66ac9db NB |
3900 | } |
3901 | /* | |
3902 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3903 | * padding SGs for linking and to mark the end. | |
3904 | */ | |
a1d8b49a | 3905 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3906 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3907 | |
6708bb27 | 3908 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3909 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3910 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3911 | |
a1d8b49a AG |
3912 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3913 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3914 | |
6708bb27 | 3915 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3916 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3917 | if (sg_is_chain(sg)) |
6708bb27 | 3918 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3919 | if (sg_is_last(sg)) |
6708bb27 | 3920 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3921 | } |
c66ac9db NB |
3922 | } |
3923 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3924 | ||
a1d8b49a AG |
3925 | /* |
3926 | * Break up cmd into chunks transport can handle | |
3927 | */ | |
ec98f782 | 3928 | static int transport_allocate_data_tasks( |
c66ac9db NB |
3929 | struct se_cmd *cmd, |
3930 | unsigned long long lba, | |
c66ac9db | 3931 | enum dma_data_direction data_direction, |
ec98f782 AG |
3932 | struct scatterlist *sgl, |
3933 | unsigned int sgl_nents) | |
c66ac9db | 3934 | { |
c66ac9db | 3935 | struct se_task *task; |
5951146d | 3936 | struct se_device *dev = cmd->se_dev; |
ec98f782 | 3937 | unsigned long flags; |
a3eedc22 | 3938 | int task_count, i; |
277c5f27 | 3939 | sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; |
ec98f782 AG |
3940 | u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size; |
3941 | struct scatterlist *sg; | |
3942 | struct scatterlist *cmd_sg; | |
a1d8b49a | 3943 | |
ec98f782 AG |
3944 | WARN_ON(cmd->data_length % sector_size); |
3945 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); | |
277c5f27 NB |
3946 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
3947 | ||
ec98f782 AG |
3948 | cmd_sg = sgl; |
3949 | for (i = 0; i < task_count; i++) { | |
c3c74c7a | 3950 | unsigned int task_size, task_sg_nents_padded; |
ec98f782 | 3951 | int count; |
a1d8b49a | 3952 | |
c66ac9db | 3953 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3954 | if (!task) |
ec98f782 | 3955 | return -ENOMEM; |
c66ac9db | 3956 | |
c66ac9db | 3957 | task->task_lba = lba; |
ec98f782 AG |
3958 | task->task_sectors = min(sectors, dev_max_sectors); |
3959 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3960 | |
525a48a2 NB |
3961 | /* |
3962 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3963 | * in order to calculate the number per task SGL entries | |
3964 | */ | |
3965 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3966 | /* |
ec98f782 AG |
3967 | * Check if the fabric module driver is requesting that all |
3968 | * struct se_task->task_sg[] be chained together.. If so, | |
3969 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3970 | * marking the end of the chained SGL for every task except |
3971 | * the last one for (task_count > 1) operation, or skipping | |
3972 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3973 | */ |
c3c74c7a NB |
3974 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3975 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3976 | } else |
3977 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3978 | |
1d20bb61 | 3979 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3980 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3981 | if (!task->task_sg) { |
3982 | cmd->se_dev->transport->free_task(task); | |
3983 | return -ENOMEM; | |
3984 | } | |
3985 | ||
c3c74c7a | 3986 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3987 | |
ec98f782 AG |
3988 | task_size = task->task_size; |
3989 | ||
3990 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3991 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3992 | if (cmd_sg->length > task_size) |
3993 | break; | |
3994 | ||
3995 | *sg = *cmd_sg; | |
3996 | task_size -= cmd_sg->length; | |
3997 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3998 | } |
c66ac9db | 3999 | |
ec98f782 AG |
4000 | lba += task->task_sectors; |
4001 | sectors -= task->task_sectors; | |
c66ac9db | 4002 | |
ec98f782 AG |
4003 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4004 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
4005 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4006 | } |
4007 | ||
ec98f782 | 4008 | return task_count; |
c66ac9db NB |
4009 | } |
4010 | ||
4011 | static int | |
ec98f782 | 4012 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 4013 | { |
c66ac9db | 4014 | struct se_task *task; |
ec98f782 | 4015 | unsigned long flags; |
c66ac9db NB |
4016 | |
4017 | task = transport_generic_get_task(cmd, cmd->data_direction); | |
4018 | if (!task) | |
ec98f782 | 4019 | return -ENOMEM; |
c66ac9db | 4020 | |
ec98f782 AG |
4021 | task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
4022 | GFP_KERNEL); | |
4023 | if (!task->task_sg) { | |
4024 | cmd->se_dev->transport->free_task(task); | |
4025 | return -ENOMEM; | |
4026 | } | |
4027 | ||
4028 | memcpy(task->task_sg, cmd->t_data_sg, | |
4029 | sizeof(struct scatterlist) * cmd->t_data_nents); | |
c66ac9db | 4030 | task->task_size = cmd->data_length; |
6708bb27 | 4031 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 4032 | |
ec98f782 AG |
4033 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4034 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
4035 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4036 | |
6708bb27 | 4037 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 4038 | return 1; |
ec98f782 AG |
4039 | } |
4040 | ||
4041 | static u32 transport_allocate_tasks( | |
4042 | struct se_cmd *cmd, | |
4043 | unsigned long long lba, | |
4044 | enum dma_data_direction data_direction, | |
4045 | struct scatterlist *sgl, | |
4046 | unsigned int sgl_nents) | |
4047 | { | |
01cde4d5 NB |
4048 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { |
4049 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
4050 | return -EINVAL; | |
4051 | ||
ec98f782 AG |
4052 | return transport_allocate_data_tasks(cmd, lba, data_direction, |
4053 | sgl, sgl_nents); | |
01cde4d5 | 4054 | } else |
6708bb27 AG |
4055 | return transport_allocate_control_task(cmd); |
4056 | ||
c66ac9db NB |
4057 | } |
4058 | ||
ec98f782 | 4059 | |
c66ac9db NB |
4060 | /* transport_generic_new_cmd(): Called from transport_processing_thread() |
4061 | * | |
4062 | * Allocate storage transport resources from a set of values predefined | |
4063 | * by transport_generic_cmd_sequencer() from the iSCSI Target RX process. | |
4064 | * Any non zero return here is treated as an "out of resource' op here. | |
4065 | */ | |
4066 | /* | |
4067 | * Generate struct se_task(s) and/or their payloads for this CDB. | |
4068 | */ | |
a1d8b49a | 4069 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 4070 | { |
c66ac9db NB |
4071 | int ret = 0; |
4072 | ||
4073 | /* | |
4074 | * Determine is the TCM fabric module has already allocated physical | |
4075 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 4076 | * beforehand. |
c66ac9db | 4077 | */ |
ec98f782 AG |
4078 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
4079 | cmd->data_length) { | |
05d1c7c0 | 4080 | ret = transport_generic_get_mem(cmd); |
c66ac9db NB |
4081 | if (ret < 0) |
4082 | return ret; | |
4083 | } | |
1d20bb61 NB |
4084 | /* |
4085 | * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for | |
4086 | * control or data CDB types, and perform the map to backend subsystem | |
4087 | * code from SGL memory allocated here by transport_generic_get_mem(), or | |
4088 | * via pre-existing SGL memory setup explictly by fabric module code with | |
4089 | * transport_generic_map_mem_to_cmd(). | |
4090 | */ | |
c66ac9db NB |
4091 | ret = transport_new_cmd_obj(cmd); |
4092 | if (ret < 0) | |
4093 | return ret; | |
c66ac9db | 4094 | /* |
a1d8b49a | 4095 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
4096 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
4097 | * will be added to the struct se_device execution queue after its WRITE | |
4098 | * data has arrived. (ie: It gets handled by the transport processing | |
4099 | * thread a second time) | |
4100 | */ | |
4101 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
4102 | transport_add_tasks_to_state_queue(cmd); | |
4103 | return transport_generic_write_pending(cmd); | |
4104 | } | |
4105 | /* | |
4106 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
4107 | * to the execution queue. | |
4108 | */ | |
4109 | transport_execute_tasks(cmd); | |
4110 | return 0; | |
4111 | } | |
a1d8b49a | 4112 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
4113 | |
4114 | /* transport_generic_process_write(): | |
4115 | * | |
4116 | * | |
4117 | */ | |
4118 | void transport_generic_process_write(struct se_cmd *cmd) | |
4119 | { | |
c66ac9db NB |
4120 | transport_execute_tasks(cmd); |
4121 | } | |
4122 | EXPORT_SYMBOL(transport_generic_process_write); | |
4123 | ||
07bde79a NB |
4124 | static int transport_write_pending_qf(struct se_cmd *cmd) |
4125 | { | |
4126 | return cmd->se_tfo->write_pending(cmd); | |
4127 | } | |
4128 | ||
c66ac9db NB |
4129 | /* transport_generic_write_pending(): |
4130 | * | |
4131 | * | |
4132 | */ | |
4133 | static int transport_generic_write_pending(struct se_cmd *cmd) | |
4134 | { | |
4135 | unsigned long flags; | |
4136 | int ret; | |
4137 | ||
a1d8b49a | 4138 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4139 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 4140 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a NB |
4141 | |
4142 | if (cmd->transport_qf_callback) { | |
4143 | ret = cmd->transport_qf_callback(cmd); | |
4144 | if (ret == -EAGAIN) | |
4145 | goto queue_full; | |
4146 | else if (ret < 0) | |
4147 | return ret; | |
4148 | ||
4149 | cmd->transport_qf_callback = NULL; | |
4150 | return 0; | |
4151 | } | |
05d1c7c0 | 4152 | |
c66ac9db NB |
4153 | /* |
4154 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
a1d8b49a | 4155 | * cmd->t_transport_active=0 so that transport_generic_handle_data |
c66ac9db | 4156 | * can be called from HW target mode interrupt code. This is safe |
e3d6f909 | 4157 | * to be called with transport_off=1 before the cmd->se_tfo->write_pending |
c66ac9db NB |
4158 | * because the se_cmd->se_lun pointer is not being cleared. |
4159 | */ | |
4160 | transport_cmd_check_stop(cmd, 1, 0); | |
4161 | ||
4162 | /* | |
4163 | * Call the fabric write_pending function here to let the | |
4164 | * frontend know that WRITE buffers are ready. | |
4165 | */ | |
e3d6f909 | 4166 | ret = cmd->se_tfo->write_pending(cmd); |
07bde79a NB |
4167 | if (ret == -EAGAIN) |
4168 | goto queue_full; | |
4169 | else if (ret < 0) | |
c66ac9db NB |
4170 | return ret; |
4171 | ||
4172 | return PYX_TRANSPORT_WRITE_PENDING; | |
07bde79a NB |
4173 | |
4174 | queue_full: | |
6708bb27 | 4175 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a NB |
4176 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
4177 | transport_handle_queue_full(cmd, cmd->se_dev, | |
4178 | transport_write_pending_qf); | |
4179 | return ret; | |
c66ac9db NB |
4180 | } |
4181 | ||
2dbc43d2 CH |
4182 | /** |
4183 | * transport_release_cmd - free a command | |
4184 | * @cmd: command to free | |
4185 | * | |
4186 | * This routine unconditionally frees a command, and reference counting | |
4187 | * or list removal must be done in the caller. | |
4188 | */ | |
35462975 | 4189 | void transport_release_cmd(struct se_cmd *cmd) |
c66ac9db | 4190 | { |
e3d6f909 | 4191 | BUG_ON(!cmd->se_tfo); |
c66ac9db | 4192 | |
2dbc43d2 CH |
4193 | if (cmd->se_tmr_req) |
4194 | core_tmr_release_req(cmd->se_tmr_req); | |
4195 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
4196 | kfree(cmd->t_task_cdb); | |
35462975 | 4197 | cmd->se_tfo->release_cmd(cmd); |
c66ac9db | 4198 | } |
35462975 | 4199 | EXPORT_SYMBOL(transport_release_cmd); |
c66ac9db | 4200 | |
39c05f32 | 4201 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 4202 | { |
d14921d6 NB |
4203 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
4204 | if (wait_for_tasks && cmd->se_tmr_req) | |
4205 | transport_wait_for_tasks(cmd); | |
4206 | ||
35462975 | 4207 | transport_release_cmd(cmd); |
d14921d6 NB |
4208 | } else { |
4209 | if (wait_for_tasks) | |
4210 | transport_wait_for_tasks(cmd); | |
4211 | ||
c66ac9db NB |
4212 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
4213 | ||
82f1c8a4 | 4214 | if (cmd->se_lun) |
c66ac9db | 4215 | transport_lun_remove_cmd(cmd); |
c66ac9db | 4216 | |
f4366772 NB |
4217 | transport_free_dev_tasks(cmd); |
4218 | ||
39c05f32 | 4219 | transport_put_cmd(cmd); |
c66ac9db NB |
4220 | } |
4221 | } | |
4222 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
4223 | ||
c66ac9db NB |
4224 | /* transport_lun_wait_for_tasks(): |
4225 | * | |
4226 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4227 | * an struct se_lun to be successfully shutdown. | |
4228 | */ | |
4229 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4230 | { | |
4231 | unsigned long flags; | |
4232 | int ret; | |
4233 | /* | |
4234 | * If the frontend has already requested this struct se_cmd to | |
4235 | * be stopped, we can safely ignore this struct se_cmd. | |
4236 | */ | |
a1d8b49a AG |
4237 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4238 | if (atomic_read(&cmd->t_transport_stop)) { | |
4239 | atomic_set(&cmd->transport_lun_stop, 0); | |
6708bb27 | 4240 | pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
e3d6f909 | 4241 | " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4242 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4243 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4244 | return -EPERM; |
c66ac9db | 4245 | } |
a1d8b49a AG |
4246 | atomic_set(&cmd->transport_lun_fe_stop, 1); |
4247 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4248 | |
5951146d | 4249 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4250 | |
4251 | ret = transport_stop_tasks_for_cmd(cmd); | |
4252 | ||
6708bb27 AG |
4253 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4254 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4255 | if (!ret) { |
6708bb27 | 4256 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4257 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4258 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4259 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4260 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4261 | } |
5951146d | 4262 | transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj); |
c66ac9db NB |
4263 | |
4264 | return 0; | |
4265 | } | |
4266 | ||
c66ac9db NB |
4267 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4268 | { | |
4269 | struct se_cmd *cmd = NULL; | |
4270 | unsigned long lun_flags, cmd_flags; | |
4271 | /* | |
4272 | * Do exception processing and return CHECK_CONDITION status to the | |
4273 | * Initiator Port. | |
4274 | */ | |
4275 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4276 | while (!list_empty(&lun->lun_cmd_list)) { |
4277 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4278 | struct se_cmd, se_lun_node); | |
4279 | list_del(&cmd->se_lun_node); | |
4280 | ||
a1d8b49a | 4281 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4282 | /* |
4283 | * This will notify iscsi_target_transport.c: | |
4284 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4285 | * progress for the iscsi_cmd_t. | |
4286 | */ | |
a1d8b49a | 4287 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4288 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4289 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4290 | cmd->se_lun->unpacked_lun, |
4291 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a AG |
4292 | atomic_set(&cmd->transport_lun_stop, 1); |
4293 | spin_unlock(&cmd->t_state_lock); | |
c66ac9db NB |
4294 | |
4295 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4296 | ||
6708bb27 AG |
4297 | if (!cmd->se_lun) { |
4298 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4299 | cmd->se_tfo->get_task_tag(cmd), |
4300 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4301 | BUG(); |
4302 | } | |
4303 | /* | |
4304 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4305 | * and/or stop its context. | |
4306 | */ | |
6708bb27 | 4307 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4308 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4309 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4310 | |
e3d6f909 | 4311 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4312 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4313 | continue; | |
4314 | } | |
4315 | ||
6708bb27 | 4316 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4317 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4318 | cmd->se_lun->unpacked_lun, |
4319 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4320 | |
a1d8b49a | 4321 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
6708bb27 | 4322 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 4323 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4324 | goto check_cond; |
4325 | } | |
a1d8b49a | 4326 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 4327 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4328 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4329 | |
4330 | transport_free_dev_tasks(cmd); | |
4331 | /* | |
4332 | * The Storage engine stopped this struct se_cmd before it was | |
4333 | * send to the fabric frontend for delivery back to the | |
4334 | * Initiator Node. Return this SCSI CDB back with an | |
4335 | * CHECK_CONDITION status. | |
4336 | */ | |
4337 | check_cond: | |
4338 | transport_send_check_condition_and_sense(cmd, | |
4339 | TCM_NON_EXISTENT_LUN, 0); | |
4340 | /* | |
4341 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4342 | * be released, notify the waiting thread now that LU has | |
4343 | * finished accessing it. | |
4344 | */ | |
a1d8b49a AG |
4345 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
4346 | if (atomic_read(&cmd->transport_lun_fe_stop)) { | |
6708bb27 | 4347 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4348 | " struct se_cmd: %p ITT: 0x%08x\n", |
4349 | lun->unpacked_lun, | |
e3d6f909 | 4350 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4351 | |
a1d8b49a | 4352 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4353 | cmd_flags); |
4354 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4355 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4356 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4357 | continue; | |
4358 | } | |
6708bb27 | 4359 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4360 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4361 | |
a1d8b49a | 4362 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4363 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4364 | } | |
4365 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4366 | } | |
4367 | ||
4368 | static int transport_clear_lun_thread(void *p) | |
4369 | { | |
4370 | struct se_lun *lun = (struct se_lun *)p; | |
4371 | ||
4372 | __transport_clear_lun_from_sessions(lun); | |
4373 | complete(&lun->lun_shutdown_comp); | |
4374 | ||
4375 | return 0; | |
4376 | } | |
4377 | ||
4378 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4379 | { | |
4380 | struct task_struct *kt; | |
4381 | ||
5951146d | 4382 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4383 | "tcm_cl_%u", lun->unpacked_lun); |
4384 | if (IS_ERR(kt)) { | |
6708bb27 | 4385 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4386 | return PTR_ERR(kt); |
c66ac9db NB |
4387 | } |
4388 | wait_for_completion(&lun->lun_shutdown_comp); | |
4389 | ||
4390 | return 0; | |
4391 | } | |
4392 | ||
d14921d6 NB |
4393 | /** |
4394 | * transport_wait_for_tasks - wait for completion to occur | |
4395 | * @cmd: command to wait | |
c66ac9db | 4396 | * |
d14921d6 NB |
4397 | * Called from frontend fabric context to wait for storage engine |
4398 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4399 | */ |
d14921d6 | 4400 | void transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4401 | { |
4402 | unsigned long flags; | |
4403 | ||
a1d8b49a | 4404 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4405 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4406 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4407 | return; | |
4408 | } | |
4409 | /* | |
4410 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4411 | * has been set in transport_set_supported_SAM_opcode(). | |
4412 | */ | |
4413 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4414 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4415 | return; | |
4416 | } | |
c66ac9db NB |
4417 | /* |
4418 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4419 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4420 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4421 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4422 | * has completed its operation on the struct se_cmd. | |
4423 | */ | |
a1d8b49a | 4424 | if (atomic_read(&cmd->transport_lun_stop)) { |
c66ac9db | 4425 | |
6708bb27 | 4426 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4427 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4428 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4429 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4430 | /* |
4431 | * There is a special case for WRITES where a FE exception + | |
4432 | * LUN shutdown means ConfigFS context is still sleeping on | |
4433 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4434 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4435 | * here. | |
4436 | */ | |
a1d8b49a AG |
4437 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4438 | complete(&cmd->transport_lun_stop_comp); | |
4439 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4440 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4441 | |
4442 | transport_all_task_dev_remove_state(cmd); | |
4443 | /* | |
4444 | * At this point, the frontend who was the originator of this | |
4445 | * struct se_cmd, now owns the structure and can be released through | |
4446 | * normal means below. | |
4447 | */ | |
6708bb27 | 4448 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4449 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4450 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4451 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4452 | |
a1d8b49a | 4453 | atomic_set(&cmd->transport_lun_stop, 0); |
c66ac9db | 4454 | } |
a1d8b49a | 4455 | if (!atomic_read(&cmd->t_transport_active) || |
d14921d6 NB |
4456 | atomic_read(&cmd->t_transport_aborted)) { |
4457 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4458 | return; | |
4459 | } | |
c66ac9db | 4460 | |
a1d8b49a | 4461 | atomic_set(&cmd->t_transport_stop, 1); |
c66ac9db | 4462 | |
6708bb27 | 4463 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
c66ac9db | 4464 | " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop" |
e3d6f909 AG |
4465 | " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
4466 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
c66ac9db NB |
4467 | cmd->deferred_t_state); |
4468 | ||
a1d8b49a | 4469 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4470 | |
5951146d | 4471 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4472 | |
a1d8b49a | 4473 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4474 | |
a1d8b49a AG |
4475 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4476 | atomic_set(&cmd->t_transport_active, 0); | |
4477 | atomic_set(&cmd->t_transport_stop, 0); | |
c66ac9db | 4478 | |
6708bb27 | 4479 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4480 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4481 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4482 | |
d14921d6 | 4483 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4484 | } |
d14921d6 | 4485 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4486 | |
4487 | static int transport_get_sense_codes( | |
4488 | struct se_cmd *cmd, | |
4489 | u8 *asc, | |
4490 | u8 *ascq) | |
4491 | { | |
4492 | *asc = cmd->scsi_asc; | |
4493 | *ascq = cmd->scsi_ascq; | |
4494 | ||
4495 | return 0; | |
4496 | } | |
4497 | ||
4498 | static int transport_set_sense_codes( | |
4499 | struct se_cmd *cmd, | |
4500 | u8 asc, | |
4501 | u8 ascq) | |
4502 | { | |
4503 | cmd->scsi_asc = asc; | |
4504 | cmd->scsi_ascq = ascq; | |
4505 | ||
4506 | return 0; | |
4507 | } | |
4508 | ||
4509 | int transport_send_check_condition_and_sense( | |
4510 | struct se_cmd *cmd, | |
4511 | u8 reason, | |
4512 | int from_transport) | |
4513 | { | |
4514 | unsigned char *buffer = cmd->sense_buffer; | |
4515 | unsigned long flags; | |
4516 | int offset; | |
4517 | u8 asc = 0, ascq = 0; | |
4518 | ||
a1d8b49a | 4519 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4520 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4521 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4522 | return 0; |
4523 | } | |
4524 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4525 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4526 | |
4527 | if (!reason && from_transport) | |
4528 | goto after_reason; | |
4529 | ||
4530 | if (!from_transport) | |
4531 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4532 | /* | |
4533 | * Data Segment and SenseLength of the fabric response PDU. | |
4534 | * | |
4535 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4536 | * from include/scsi/scsi_cmnd.h | |
4537 | */ | |
e3d6f909 | 4538 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4539 | TRANSPORT_SENSE_BUFFER); |
4540 | /* | |
4541 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4542 | * SENSE KEY values from include/scsi/scsi.h | |
4543 | */ | |
4544 | switch (reason) { | |
4545 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4546 | /* CURRENT ERROR */ |
4547 | buffer[offset] = 0x70; | |
4548 | /* ILLEGAL REQUEST */ | |
4549 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4550 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4551 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4552 | break; | |
c66ac9db NB |
4553 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4554 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4555 | /* CURRENT ERROR */ | |
4556 | buffer[offset] = 0x70; | |
4557 | /* ILLEGAL REQUEST */ | |
4558 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4559 | /* INVALID COMMAND OPERATION CODE */ | |
4560 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4561 | break; | |
4562 | case TCM_UNKNOWN_MODE_PAGE: | |
4563 | /* CURRENT ERROR */ | |
4564 | buffer[offset] = 0x70; | |
4565 | /* ILLEGAL REQUEST */ | |
4566 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4567 | /* INVALID FIELD IN CDB */ | |
4568 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4569 | break; | |
4570 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4571 | /* CURRENT ERROR */ | |
4572 | buffer[offset] = 0x70; | |
4573 | /* ABORTED COMMAND */ | |
4574 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4575 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4576 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4577 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4578 | break; | |
4579 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4580 | /* CURRENT ERROR */ | |
4581 | buffer[offset] = 0x70; | |
4582 | /* ABORTED COMMAND */ | |
4583 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4584 | /* WRITE ERROR */ | |
4585 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4586 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4587 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4588 | break; | |
4589 | case TCM_INVALID_CDB_FIELD: | |
4590 | /* CURRENT ERROR */ | |
4591 | buffer[offset] = 0x70; | |
4592 | /* ABORTED COMMAND */ | |
4593 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4594 | /* INVALID FIELD IN CDB */ | |
4595 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4596 | break; | |
4597 | case TCM_INVALID_PARAMETER_LIST: | |
4598 | /* CURRENT ERROR */ | |
4599 | buffer[offset] = 0x70; | |
4600 | /* ABORTED COMMAND */ | |
4601 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4602 | /* INVALID FIELD IN PARAMETER LIST */ | |
4603 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4604 | break; | |
4605 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4606 | /* CURRENT ERROR */ | |
4607 | buffer[offset] = 0x70; | |
4608 | /* ABORTED COMMAND */ | |
4609 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4610 | /* WRITE ERROR */ | |
4611 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4612 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4613 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4614 | break; | |
4615 | case TCM_SERVICE_CRC_ERROR: | |
4616 | /* CURRENT ERROR */ | |
4617 | buffer[offset] = 0x70; | |
4618 | /* ABORTED COMMAND */ | |
4619 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4620 | /* PROTOCOL SERVICE CRC ERROR */ | |
4621 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4622 | /* N/A */ | |
4623 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4624 | break; | |
4625 | case TCM_SNACK_REJECTED: | |
4626 | /* CURRENT ERROR */ | |
4627 | buffer[offset] = 0x70; | |
4628 | /* ABORTED COMMAND */ | |
4629 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4630 | /* READ ERROR */ | |
4631 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4632 | /* FAILED RETRANSMISSION REQUEST */ | |
4633 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4634 | break; | |
4635 | case TCM_WRITE_PROTECTED: | |
4636 | /* CURRENT ERROR */ | |
4637 | buffer[offset] = 0x70; | |
4638 | /* DATA PROTECT */ | |
4639 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4640 | /* WRITE PROTECTED */ | |
4641 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4642 | break; | |
4643 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4644 | /* CURRENT ERROR */ | |
4645 | buffer[offset] = 0x70; | |
4646 | /* UNIT ATTENTION */ | |
4647 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4648 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4649 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4650 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4651 | break; | |
4652 | case TCM_CHECK_CONDITION_NOT_READY: | |
4653 | /* CURRENT ERROR */ | |
4654 | buffer[offset] = 0x70; | |
4655 | /* Not Ready */ | |
4656 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4657 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4658 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4659 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4660 | break; | |
4661 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4662 | default: | |
4663 | /* CURRENT ERROR */ | |
4664 | buffer[offset] = 0x70; | |
4665 | /* ILLEGAL REQUEST */ | |
4666 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4667 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4668 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4669 | break; | |
4670 | } | |
4671 | /* | |
4672 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4673 | */ | |
4674 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4675 | /* | |
4676 | * Automatically padded, this value is encoded in the fabric's | |
4677 | * data_length response PDU containing the SCSI defined sense data. | |
4678 | */ | |
4679 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4680 | ||
4681 | after_reason: | |
07bde79a | 4682 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4683 | } |
4684 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4685 | ||
4686 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4687 | { | |
4688 | int ret = 0; | |
4689 | ||
a1d8b49a | 4690 | if (atomic_read(&cmd->t_transport_aborted) != 0) { |
6708bb27 | 4691 | if (!send_status || |
c66ac9db NB |
4692 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4693 | return 1; | |
4694 | #if 0 | |
6708bb27 | 4695 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4696 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4697 | cmd->t_task_cdb[0], |
e3d6f909 | 4698 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4699 | #endif |
4700 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4701 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4702 | ret = 1; |
4703 | } | |
4704 | return ret; | |
4705 | } | |
4706 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4707 | ||
4708 | void transport_send_task_abort(struct se_cmd *cmd) | |
4709 | { | |
c252f003 NB |
4710 | unsigned long flags; |
4711 | ||
4712 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4713 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4714 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4715 | return; | |
4716 | } | |
4717 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4718 | ||
c66ac9db NB |
4719 | /* |
4720 | * If there are still expected incoming fabric WRITEs, we wait | |
4721 | * until until they have completed before sending a TASK_ABORTED | |
4722 | * response. This response with TASK_ABORTED status will be | |
4723 | * queued back to fabric module by transport_check_aborted_status(). | |
4724 | */ | |
4725 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4726 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
a1d8b49a | 4727 | atomic_inc(&cmd->t_transport_aborted); |
c66ac9db NB |
4728 | smp_mb__after_atomic_inc(); |
4729 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4730 | transport_new_cmd_failure(cmd); | |
4731 | return; | |
4732 | } | |
4733 | } | |
4734 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4735 | #if 0 | |
6708bb27 | 4736 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4737 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4738 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4739 | #endif |
e3d6f909 | 4740 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4741 | } |
4742 | ||
4743 | /* transport_generic_do_tmr(): | |
4744 | * | |
4745 | * | |
4746 | */ | |
4747 | int transport_generic_do_tmr(struct se_cmd *cmd) | |
4748 | { | |
5951146d | 4749 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4750 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4751 | int ret; | |
4752 | ||
4753 | switch (tmr->function) { | |
5c6cd613 | 4754 | case TMR_ABORT_TASK: |
c66ac9db NB |
4755 | tmr->response = TMR_FUNCTION_REJECTED; |
4756 | break; | |
5c6cd613 NB |
4757 | case TMR_ABORT_TASK_SET: |
4758 | case TMR_CLEAR_ACA: | |
4759 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4760 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4761 | break; | |
5c6cd613 | 4762 | case TMR_LUN_RESET: |
c66ac9db NB |
4763 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4764 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4765 | TMR_FUNCTION_REJECTED; | |
4766 | break; | |
5c6cd613 | 4767 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4768 | tmr->response = TMR_FUNCTION_REJECTED; |
4769 | break; | |
5c6cd613 | 4770 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4771 | tmr->response = TMR_FUNCTION_REJECTED; |
4772 | break; | |
c66ac9db | 4773 | default: |
6708bb27 | 4774 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4775 | tmr->function); |
4776 | tmr->response = TMR_FUNCTION_REJECTED; | |
4777 | break; | |
4778 | } | |
4779 | ||
4780 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4781 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db NB |
4782 | |
4783 | transport_cmd_check_stop(cmd, 2, 0); | |
4784 | return 0; | |
4785 | } | |
4786 | ||
c66ac9db NB |
4787 | /* transport_processing_thread(): |
4788 | * | |
4789 | * | |
4790 | */ | |
4791 | static int transport_processing_thread(void *param) | |
4792 | { | |
5951146d | 4793 | int ret; |
c66ac9db NB |
4794 | struct se_cmd *cmd; |
4795 | struct se_device *dev = (struct se_device *) param; | |
c66ac9db NB |
4796 | |
4797 | set_user_nice(current, -20); | |
4798 | ||
4799 | while (!kthread_should_stop()) { | |
e3d6f909 AG |
4800 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4801 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4802 | kthread_should_stop()); |
4803 | if (ret < 0) | |
4804 | goto out; | |
4805 | ||
c66ac9db NB |
4806 | get_cmd: |
4807 | __transport_execute_tasks(dev); | |
4808 | ||
5951146d AG |
4809 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4810 | if (!cmd) | |
c66ac9db NB |
4811 | continue; |
4812 | ||
5951146d | 4813 | switch (cmd->t_state) { |
680b73c5 CH |
4814 | case TRANSPORT_NEW_CMD: |
4815 | BUG(); | |
4816 | break; | |
c66ac9db | 4817 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4818 | if (!cmd->se_tfo->new_cmd_map) { |
4819 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4820 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4821 | BUG(); | |
4822 | } | |
e3d6f909 | 4823 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db NB |
4824 | if (ret < 0) { |
4825 | cmd->transport_error_status = ret; | |
4826 | transport_generic_request_failure(cmd, NULL, | |
4827 | 0, (cmd->data_direction != | |
4828 | DMA_TO_DEVICE)); | |
4829 | break; | |
4830 | } | |
c66ac9db | 4831 | ret = transport_generic_new_cmd(cmd); |
07bde79a NB |
4832 | if (ret == -EAGAIN) |
4833 | break; | |
4834 | else if (ret < 0) { | |
c66ac9db NB |
4835 | cmd->transport_error_status = ret; |
4836 | transport_generic_request_failure(cmd, NULL, | |
4837 | 0, (cmd->data_direction != | |
4838 | DMA_TO_DEVICE)); | |
4839 | } | |
4840 | break; | |
4841 | case TRANSPORT_PROCESS_WRITE: | |
4842 | transport_generic_process_write(cmd); | |
4843 | break; | |
4844 | case TRANSPORT_COMPLETE_OK: | |
4845 | transport_stop_all_task_timers(cmd); | |
4846 | transport_generic_complete_ok(cmd); | |
4847 | break; | |
4848 | case TRANSPORT_REMOVE: | |
e6a2573f | 4849 | transport_put_cmd(cmd); |
c66ac9db | 4850 | break; |
f4366772 | 4851 | case TRANSPORT_FREE_CMD_INTR: |
82f1c8a4 | 4852 | transport_generic_free_cmd(cmd, 0); |
f4366772 | 4853 | break; |
c66ac9db NB |
4854 | case TRANSPORT_PROCESS_TMR: |
4855 | transport_generic_do_tmr(cmd); | |
4856 | break; | |
4857 | case TRANSPORT_COMPLETE_FAILURE: | |
4858 | transport_generic_request_failure(cmd, NULL, 1, 1); | |
4859 | break; | |
4860 | case TRANSPORT_COMPLETE_TIMEOUT: | |
4861 | transport_stop_all_task_timers(cmd); | |
4862 | transport_generic_request_timeout(cmd); | |
4863 | break; | |
07bde79a NB |
4864 | case TRANSPORT_COMPLETE_QF_WP: |
4865 | transport_generic_write_pending(cmd); | |
4866 | break; | |
c66ac9db | 4867 | default: |
6708bb27 | 4868 | pr_err("Unknown t_state: %d deferred_t_state:" |
c66ac9db | 4869 | " %d for ITT: 0x%08x i_state: %d on SE LUN:" |
5951146d | 4870 | " %u\n", cmd->t_state, cmd->deferred_t_state, |
e3d6f909 AG |
4871 | cmd->se_tfo->get_task_tag(cmd), |
4872 | cmd->se_tfo->get_cmd_state(cmd), | |
4873 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4874 | BUG(); |
4875 | } | |
4876 | ||
4877 | goto get_cmd; | |
4878 | } | |
4879 | ||
4880 | out: | |
ce8762f6 NB |
4881 | WARN_ON(!list_empty(&dev->state_task_list)); |
4882 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4883 | dev->process_thread = NULL; |
4884 | return 0; | |
4885 | } |