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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / target / target_core_pscsi.c
blob9d7ce3daa26275a7c08b831ae9b955382e0e9103
1 /*******************************************************************************
2 * Filename: target_core_pscsi.c
3 *
4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
5 *
6 * Copyright (c) 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
29 #include <linux/string.h>
30 #include <linux/parser.h>
31 #include <linux/timer.h>
32 #include <linux/blkdev.h>
33 #include <linux/blk_types.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/genhd.h>
37 #include <linux/cdrom.h>
38 #include <linux/ratelimit.h>
39 #include <linux/module.h>
40 #include <asm/unaligned.h>
41
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_host.h>
46 #include <scsi/scsi_tcq.h>
47
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50
51 #include "target_core_alua.h"
52 #include "target_core_pscsi.h"
53
54 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
55
56 static struct se_subsystem_api pscsi_template;
57
58 static int pscsi_execute_cmd(struct se_cmd *cmd);
59 static void pscsi_req_done(struct request *, int);
60
61 /* pscsi_attach_hba():
62 *
63 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
64 * from the passed SCSI Host ID.
65 */
66 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
67 {
68 struct pscsi_hba_virt *phv;
69
70 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
71 if (!phv) {
72 pr_err("Unable to allocate struct pscsi_hba_virt\n");
73 return -ENOMEM;
74 }
75 phv->phv_host_id = host_id;
76 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
77
78 hba->hba_ptr = phv;
79
80 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
81 " Generic Target Core Stack %s\n", hba->hba_id,
82 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
83 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
84 hba->hba_id);
85
86 return 0;
87 }
88
89 static void pscsi_detach_hba(struct se_hba *hba)
90 {
91 struct pscsi_hba_virt *phv = hba->hba_ptr;
92 struct Scsi_Host *scsi_host = phv->phv_lld_host;
93
94 if (scsi_host) {
95 scsi_host_put(scsi_host);
96
97 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
98 " Generic Target Core\n", hba->hba_id,
99 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
100 "Unknown");
101 } else
102 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
103 " from Generic Target Core\n", hba->hba_id);
104
105 kfree(phv);
106 hba->hba_ptr = NULL;
107 }
108
109 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
110 {
111 struct pscsi_hba_virt *phv = hba->hba_ptr;
112 struct Scsi_Host *sh = phv->phv_lld_host;
113 /*
114 * Release the struct Scsi_Host
115 */
116 if (!mode_flag) {
117 if (!sh)
118 return 0;
119
120 phv->phv_lld_host = NULL;
121 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
122
123 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
124 " %s\n", hba->hba_id, (sh->hostt->name) ?
125 (sh->hostt->name) : "Unknown");
126
127 scsi_host_put(sh);
128 return 0;
129 }
130 /*
131 * Otherwise, locate struct Scsi_Host from the original passed
132 * pSCSI Host ID and enable for phba mode
133 */
134 sh = scsi_host_lookup(phv->phv_host_id);
135 if (IS_ERR(sh)) {
136 pr_err("pSCSI: Unable to locate SCSI Host for"
137 " phv_host_id: %d\n", phv->phv_host_id);
138 return PTR_ERR(sh);
139 }
140
141 phv->phv_lld_host = sh;
142 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
143
144 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
145 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
146
147 return 1;
148 }
149
150 static void pscsi_tape_read_blocksize(struct se_device *dev,
151 struct scsi_device *sdev)
152 {
153 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
154 int ret;
155
156 buf = kzalloc(12, GFP_KERNEL);
157 if (!buf)
158 return;
159
160 memset(cdb, 0, MAX_COMMAND_SIZE);
161 cdb[0] = MODE_SENSE;
162 cdb[4] = 0x0c; /* 12 bytes */
163
164 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
165 HZ, 1, NULL);
166 if (ret)
167 goto out_free;
168
169 /*
170 * If MODE_SENSE still returns zero, set the default value to 1024.
171 */
172 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
173 if (!sdev->sector_size)
174 sdev->sector_size = 1024;
175 out_free:
176 kfree(buf);
177 }
178
179 static void
180 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
181 {
182 unsigned char *buf;
183
184 if (sdev->inquiry_len < INQUIRY_LEN)
185 return;
186
187 buf = sdev->inquiry;
188 if (!buf)
189 return;
190 /*
191 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
192 */
193 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
194 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
195 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
196 }
197
198 static int
199 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
200 {
201 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
202 int ret;
203
204 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
205 if (!buf)
206 return -ENOMEM;
207
208 memset(cdb, 0, MAX_COMMAND_SIZE);
209 cdb[0] = INQUIRY;
210 cdb[1] = 0x01; /* Query VPD */
211 cdb[2] = 0x80; /* Unit Serial Number */
212 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
213 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
214
215 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
216 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
217 if (ret)
218 goto out_free;
219
220 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
221
222 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
223
224 kfree(buf);
225 return 0;
226
227 out_free:
228 kfree(buf);
229 return -EPERM;
230 }
231
232 static void
233 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
234 struct t10_wwn *wwn)
235 {
236 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
237 int ident_len, page_len, off = 4, ret;
238 struct t10_vpd *vpd;
239
240 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
241 if (!buf)
242 return;
243
244 memset(cdb, 0, MAX_COMMAND_SIZE);
245 cdb[0] = INQUIRY;
246 cdb[1] = 0x01; /* Query VPD */
247 cdb[2] = 0x83; /* Device Identifier */
248 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
249 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
250
251 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
252 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
253 NULL, HZ, 1, NULL);
254 if (ret)
255 goto out;
256
257 page_len = (buf[2] << 8) | buf[3];
258 while (page_len > 0) {
259 /* Grab a pointer to the Identification descriptor */
260 page_83 = &buf[off];
261 ident_len = page_83[3];
262 if (!ident_len) {
263 pr_err("page_83[3]: identifier"
264 " length zero!\n");
265 break;
266 }
267 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
268
269 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
270 if (!vpd) {
271 pr_err("Unable to allocate memory for"
272 " struct t10_vpd\n");
273 goto out;
274 }
275 INIT_LIST_HEAD(&vpd->vpd_list);
276
277 transport_set_vpd_proto_id(vpd, page_83);
278 transport_set_vpd_assoc(vpd, page_83);
279
280 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
281 off += (ident_len + 4);
282 page_len -= (ident_len + 4);
283 kfree(vpd);
284 continue;
285 }
286 if (transport_set_vpd_ident(vpd, page_83) < 0) {
287 off += (ident_len + 4);
288 page_len -= (ident_len + 4);
289 kfree(vpd);
290 continue;
291 }
292
293 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
294 off += (ident_len + 4);
295 page_len -= (ident_len + 4);
296 }
297
298 out:
299 kfree(buf);
300 }
301
302 /* pscsi_add_device_to_list():
303 *
304 *
305 */
306 static struct se_device *pscsi_add_device_to_list(
307 struct se_hba *hba,
308 struct se_subsystem_dev *se_dev,
309 struct pscsi_dev_virt *pdv,
310 struct scsi_device *sd,
311 int dev_flags)
312 {
313 struct se_device *dev;
314 struct se_dev_limits dev_limits;
315 struct request_queue *q;
316 struct queue_limits *limits;
317
318 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
319
320 if (!sd->queue_depth) {
321 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
322
323 pr_err("Set broken SCSI Device %d:%d:%d"
324 " queue_depth to %d\n", sd->channel, sd->id,
325 sd->lun, sd->queue_depth);
326 }
327 /*
328 * Setup the local scope queue_limits from struct request_queue->limits
329 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
330 */
331 q = sd->request_queue;
332 limits = &dev_limits.limits;
333 limits->logical_block_size = sd->sector_size;
334 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
335 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
336 dev_limits.hw_queue_depth = sd->queue_depth;
337 dev_limits.queue_depth = sd->queue_depth;
338 /*
339 * Setup our standard INQUIRY info into se_dev->t10_wwn
340 */
341 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
342
343 /*
344 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
345 * which has already been referenced with Linux SCSI code with
346 * scsi_device_get() in this file's pscsi_create_virtdevice().
347 *
348 * The passthrough operations called by the transport_add_device_*
349 * function below will require this pointer to be set for passthroug
350 * ops.
351 *
352 * For the shutdown case in pscsi_free_device(), this struct
353 * scsi_device reference is released with Linux SCSI code
354 * scsi_device_put() and the pdv->pdv_sd cleared.
355 */
356 pdv->pdv_sd = sd;
357 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
358 se_dev, dev_flags, pdv,
359 &dev_limits, NULL, NULL);
360 if (!dev) {
361 pdv->pdv_sd = NULL;
362 return NULL;
363 }
364
365 /*
366 * Locate VPD WWN Information used for various purposes within
367 * the Storage Engine.
368 */
369 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
370 /*
371 * If VPD Unit Serial returned GOOD status, try
372 * VPD Device Identification page (0x83).
373 */
374 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
375 }
376
377 /*
378 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
379 */
380 if (sd->type == TYPE_TAPE)
381 pscsi_tape_read_blocksize(dev, sd);
382 return dev;
383 }
384
385 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
386 {
387 struct pscsi_dev_virt *pdv;
388
389 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
390 if (!pdv) {
391 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
392 return NULL;
393 }
394 pdv->pdv_se_hba = hba;
395
396 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
397 return pdv;
398 }
399
400 /*
401 * Called with struct Scsi_Host->host_lock called.
402 */
403 static struct se_device *pscsi_create_type_disk(
404 struct scsi_device *sd,
405 struct pscsi_dev_virt *pdv,
406 struct se_subsystem_dev *se_dev,
407 struct se_hba *hba)
408 __releases(sh->host_lock)
409 {
410 struct se_device *dev;
411 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
412 struct Scsi_Host *sh = sd->host;
413 struct block_device *bd;
414 u32 dev_flags = 0;
415
416 if (scsi_device_get(sd)) {
417 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
418 sh->host_no, sd->channel, sd->id, sd->lun);
419 spin_unlock_irq(sh->host_lock);
420 return NULL;
421 }
422 spin_unlock_irq(sh->host_lock);
423 /*
424 * Claim exclusive struct block_device access to struct scsi_device
425 * for TYPE_DISK using supplied udev_path
426 */
427 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
428 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
429 if (IS_ERR(bd)) {
430 pr_err("pSCSI: blkdev_get_by_path() failed\n");
431 scsi_device_put(sd);
432 return NULL;
433 }
434 pdv->pdv_bd = bd;
435
436 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
437 if (!dev) {
438 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
439 scsi_device_put(sd);
440 return NULL;
441 }
442 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
443 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
444
445 return dev;
446 }
447
448 /*
449 * Called with struct Scsi_Host->host_lock called.
450 */
451 static struct se_device *pscsi_create_type_rom(
452 struct scsi_device *sd,
453 struct pscsi_dev_virt *pdv,
454 struct se_subsystem_dev *se_dev,
455 struct se_hba *hba)
456 __releases(sh->host_lock)
457 {
458 struct se_device *dev;
459 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
460 struct Scsi_Host *sh = sd->host;
461 u32 dev_flags = 0;
462
463 if (scsi_device_get(sd)) {
464 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
465 sh->host_no, sd->channel, sd->id, sd->lun);
466 spin_unlock_irq(sh->host_lock);
467 return NULL;
468 }
469 spin_unlock_irq(sh->host_lock);
470
471 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
472 if (!dev) {
473 scsi_device_put(sd);
474 return NULL;
475 }
476 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
477 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
478 sd->channel, sd->id, sd->lun);
479
480 return dev;
481 }
482
483 /*
484 *Called with struct Scsi_Host->host_lock called.
485 */
486 static struct se_device *pscsi_create_type_other(
487 struct scsi_device *sd,
488 struct pscsi_dev_virt *pdv,
489 struct se_subsystem_dev *se_dev,
490 struct se_hba *hba)
491 __releases(sh->host_lock)
492 {
493 struct se_device *dev;
494 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
495 struct Scsi_Host *sh = sd->host;
496 u32 dev_flags = 0;
497
498 spin_unlock_irq(sh->host_lock);
499 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
500 if (!dev)
501 return NULL;
502
503 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
504 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
505 sd->channel, sd->id, sd->lun);
506
507 return dev;
508 }
509
510 static struct se_device *pscsi_create_virtdevice(
511 struct se_hba *hba,
512 struct se_subsystem_dev *se_dev,
513 void *p)
514 {
515 struct pscsi_dev_virt *pdv = p;
516 struct se_device *dev;
517 struct scsi_device *sd;
518 struct pscsi_hba_virt *phv = hba->hba_ptr;
519 struct Scsi_Host *sh = phv->phv_lld_host;
520 int legacy_mode_enable = 0;
521
522 if (!pdv) {
523 pr_err("Unable to locate struct pscsi_dev_virt"
524 " parameter\n");
525 return ERR_PTR(-EINVAL);
526 }
527 /*
528 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
529 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
530 */
531 if (!sh) {
532 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
533 pr_err("pSCSI: Unable to locate struct"
534 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
535 return ERR_PTR(-ENODEV);
536 }
537 /*
538 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
539 * reference, we enforce that udev_path has been set
540 */
541 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
542 pr_err("pSCSI: udev_path attribute has not"
543 " been set before ENABLE=1\n");
544 return ERR_PTR(-EINVAL);
545 }
546 /*
547 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
548 * use the original TCM hba ID to reference Linux/SCSI Host No
549 * and enable for PHV_LLD_SCSI_HOST_NO mode.
550 */
551 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
552 spin_lock(&hba->device_lock);
553 if (!list_empty(&hba->hba_dev_list)) {
554 pr_err("pSCSI: Unable to set hba_mode"
555 " with active devices\n");
556 spin_unlock(&hba->device_lock);
557 return ERR_PTR(-EEXIST);
558 }
559 spin_unlock(&hba->device_lock);
560
561 if (pscsi_pmode_enable_hba(hba, 1) != 1)
562 return ERR_PTR(-ENODEV);
563
564 legacy_mode_enable = 1;
565 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
566 sh = phv->phv_lld_host;
567 } else {
568 sh = scsi_host_lookup(pdv->pdv_host_id);
569 if (IS_ERR(sh)) {
570 pr_err("pSCSI: Unable to locate"
571 " pdv_host_id: %d\n", pdv->pdv_host_id);
572 return ERR_CAST(sh);
573 }
574 }
575 } else {
576 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
577 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
578 " struct Scsi_Host exists\n");
579 return ERR_PTR(-EEXIST);
580 }
581 }
582
583 spin_lock_irq(sh->host_lock);
584 list_for_each_entry(sd, &sh->__devices, siblings) {
585 if ((pdv->pdv_channel_id != sd->channel) ||
586 (pdv->pdv_target_id != sd->id) ||
587 (pdv->pdv_lun_id != sd->lun))
588 continue;
589 /*
590 * Functions will release the held struct scsi_host->host_lock
591 * before calling calling pscsi_add_device_to_list() to register
592 * struct scsi_device with target_core_mod.
593 */
594 switch (sd->type) {
595 case TYPE_DISK:
596 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
597 break;
598 case TYPE_ROM:
599 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
600 break;
601 default:
602 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
603 break;
604 }
605
606 if (!dev) {
607 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
608 scsi_host_put(sh);
609 else if (legacy_mode_enable) {
610 pscsi_pmode_enable_hba(hba, 0);
611 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
612 }
613 pdv->pdv_sd = NULL;
614 return ERR_PTR(-ENODEV);
615 }
616 return dev;
617 }
618 spin_unlock_irq(sh->host_lock);
619
620 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
621 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
622
623 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
624 scsi_host_put(sh);
625 else if (legacy_mode_enable) {
626 pscsi_pmode_enable_hba(hba, 0);
627 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
628 }
629
630 return ERR_PTR(-ENODEV);
631 }
632
633 /* pscsi_free_device(): (Part of se_subsystem_api_t template)
634 *
635 *
636 */
637 static void pscsi_free_device(void *p)
638 {
639 struct pscsi_dev_virt *pdv = p;
640 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
641 struct scsi_device *sd = pdv->pdv_sd;
642
643 if (sd) {
644 /*
645 * Release exclusive pSCSI internal struct block_device claim for
646 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
647 */
648 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
649 blkdev_put(pdv->pdv_bd,
650 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
651 pdv->pdv_bd = NULL;
652 }
653 /*
654 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
655 * to struct Scsi_Host now.
656 */
657 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
658 (phv->phv_lld_host != NULL))
659 scsi_host_put(phv->phv_lld_host);
660
661 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
662 scsi_device_put(sd);
663
664 pdv->pdv_sd = NULL;
665 }
666
667 kfree(pdv);
668 }
669
670 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
671 unsigned char *sense_buffer)
672 {
673 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
674 struct scsi_device *sd = pdv->pdv_sd;
675 int result;
676 struct pscsi_plugin_task *pt = cmd->priv;
677 unsigned char *cdb;
678 /*
679 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
680 * not been allocated because TCM is handling the emulation directly.
681 */
682 if (!pt)
683 return;
684
685 cdb = &pt->pscsi_cdb[0];
686 result = pt->pscsi_result;
687 /*
688 * Hack to make sure that Write-Protect modepage is set if R/O mode is
689 * forced.
690 */
691 if (!cmd->se_deve || !cmd->data_length)
692 goto after_mode_sense;
693
694 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
695 (status_byte(result) << 1) == SAM_STAT_GOOD) {
696 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
697 unsigned char *buf = transport_kmap_data_sg(cmd);
698
699 if (cdb[0] == MODE_SENSE_10) {
700 if (!(buf[3] & 0x80))
701 buf[3] |= 0x80;
702 } else {
703 if (!(buf[2] & 0x80))
704 buf[2] |= 0x80;
705 }
706
707 transport_kunmap_data_sg(cmd);
708 }
709 }
710 after_mode_sense:
711
712 if (sd->type != TYPE_TAPE || !cmd->data_length)
713 goto after_mode_select;
714
715 /*
716 * Hack to correctly obtain the initiator requested blocksize for
717 * TYPE_TAPE. Since this value is dependent upon each tape media,
718 * struct scsi_device->sector_size will not contain the correct value
719 * by default, so we go ahead and set it so
720 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
721 * storage engine.
722 */
723 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
724 (status_byte(result) << 1) == SAM_STAT_GOOD) {
725 unsigned char *buf;
726 u16 bdl;
727 u32 blocksize;
728
729 buf = sg_virt(&sg[0]);
730 if (!buf) {
731 pr_err("Unable to get buf for scatterlist\n");
732 goto after_mode_select;
733 }
734
735 if (cdb[0] == MODE_SELECT)
736 bdl = (buf[3]);
737 else
738 bdl = (buf[6] << 8) | (buf[7]);
739
740 if (!bdl)
741 goto after_mode_select;
742
743 if (cdb[0] == MODE_SELECT)
744 blocksize = (buf[9] << 16) | (buf[10] << 8) |
745 (buf[11]);
746 else
747 blocksize = (buf[13] << 16) | (buf[14] << 8) |
748 (buf[15]);
749
750 sd->sector_size = blocksize;
751 }
752 after_mode_select:
753
754 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
755 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
756 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
757 }
758 }
759
760 enum {
761 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
762 Opt_scsi_lun_id, Opt_err
763 };
764
765 static match_table_t tokens = {
766 {Opt_scsi_host_id, "scsi_host_id=%d"},
767 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
768 {Opt_scsi_target_id, "scsi_target_id=%d"},
769 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
770 {Opt_err, NULL}
771 };
772
773 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
774 struct se_subsystem_dev *se_dev,
775 const char *page,
776 ssize_t count)
777 {
778 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
779 struct pscsi_hba_virt *phv = hba->hba_ptr;
780 char *orig, *ptr, *opts;
781 substring_t args[MAX_OPT_ARGS];
782 int ret = 0, arg, token;
783
784 opts = kstrdup(page, GFP_KERNEL);
785 if (!opts)
786 return -ENOMEM;
787
788 orig = opts;
789
790 while ((ptr = strsep(&opts, ",\n")) != NULL) {
791 if (!*ptr)
792 continue;
793
794 token = match_token(ptr, tokens, args);
795 switch (token) {
796 case Opt_scsi_host_id:
797 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
798 pr_err("PSCSI[%d]: Unable to accept"
799 " scsi_host_id while phv_mode =="
800 " PHV_LLD_SCSI_HOST_NO\n",
801 phv->phv_host_id);
802 ret = -EINVAL;
803 goto out;
804 }
805 match_int(args, &arg);
806 pdv->pdv_host_id = arg;
807 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
808 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
809 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
810 break;
811 case Opt_scsi_channel_id:
812 match_int(args, &arg);
813 pdv->pdv_channel_id = arg;
814 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
815 " ID: %d\n", phv->phv_host_id,
816 pdv->pdv_channel_id);
817 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
818 break;
819 case Opt_scsi_target_id:
820 match_int(args, &arg);
821 pdv->pdv_target_id = arg;
822 pr_debug("PSCSI[%d]: Referencing SCSI Target"
823 " ID: %d\n", phv->phv_host_id,
824 pdv->pdv_target_id);
825 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
826 break;
827 case Opt_scsi_lun_id:
828 match_int(args, &arg);
829 pdv->pdv_lun_id = arg;
830 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
831 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
832 pdv->pdv_flags |= PDF_HAS_LUN_ID;
833 break;
834 default:
835 break;
836 }
837 }
838
839 out:
840 kfree(orig);
841 return (!ret) ? count : ret;
842 }
843
844 static ssize_t pscsi_check_configfs_dev_params(
845 struct se_hba *hba,
846 struct se_subsystem_dev *se_dev)
847 {
848 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
849
850 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
851 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
852 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
853 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
854 " scsi_lun_id= parameters\n");
855 return -EINVAL;
856 }
857
858 return 0;
859 }
860
861 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
862 struct se_subsystem_dev *se_dev,
863 char *b)
864 {
865 struct pscsi_hba_virt *phv = hba->hba_ptr;
866 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
867 struct scsi_device *sd = pdv->pdv_sd;
868 unsigned char host_id[16];
869 ssize_t bl;
870 int i;
871
872 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
873 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
874 else
875 snprintf(host_id, 16, "PHBA Mode");
876
877 bl = sprintf(b, "SCSI Device Bus Location:"
878 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
879 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
880 host_id);
881
882 if (sd) {
883 bl += sprintf(b + bl, " ");
884 bl += sprintf(b + bl, "Vendor: ");
885 for (i = 0; i < 8; i++) {
886 if (ISPRINT(sd->vendor[i])) /* printable character? */
887 bl += sprintf(b + bl, "%c", sd->vendor[i]);
888 else
889 bl += sprintf(b + bl, " ");
890 }
891 bl += sprintf(b + bl, " Model: ");
892 for (i = 0; i < 16; i++) {
893 if (ISPRINT(sd->model[i])) /* printable character ? */
894 bl += sprintf(b + bl, "%c", sd->model[i]);
895 else
896 bl += sprintf(b + bl, " ");
897 }
898 bl += sprintf(b + bl, " Rev: ");
899 for (i = 0; i < 4; i++) {
900 if (ISPRINT(sd->rev[i])) /* printable character ? */
901 bl += sprintf(b + bl, "%c", sd->rev[i]);
902 else
903 bl += sprintf(b + bl, " ");
904 }
905 bl += sprintf(b + bl, "\n");
906 }
907 return bl;
908 }
909
910 static void pscsi_bi_endio(struct bio *bio, int error)
911 {
912 bio_put(bio);
913 }
914
915 static inline struct bio *pscsi_get_bio(int sg_num)
916 {
917 struct bio *bio;
918 /*
919 * Use bio_malloc() following the comment in for bio -> struct request
920 * in block/blk-core.c:blk_make_request()
921 */
922 bio = bio_kmalloc(GFP_KERNEL, sg_num);
923 if (!bio) {
924 pr_err("PSCSI: bio_kmalloc() failed\n");
925 return NULL;
926 }
927 bio->bi_end_io = pscsi_bi_endio;
928
929 return bio;
930 }
931
932 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
933 u32 sgl_nents, enum dma_data_direction data_direction,
934 struct bio **hbio)
935 {
936 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
937 struct bio *bio = NULL, *tbio = NULL;
938 struct page *page;
939 struct scatterlist *sg;
940 u32 data_len = cmd->data_length, i, len, bytes, off;
941 int nr_pages = (cmd->data_length + sgl[0].offset +
942 PAGE_SIZE - 1) >> PAGE_SHIFT;
943 int nr_vecs = 0, rc;
944 int rw = (data_direction == DMA_TO_DEVICE);
945
946 *hbio = NULL;
947
948 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
949
950 for_each_sg(sgl, sg, sgl_nents, i) {
951 page = sg_page(sg);
952 off = sg->offset;
953 len = sg->length;
954
955 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
956 page, len, off);
957
958 while (len > 0 && data_len > 0) {
959 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
960 bytes = min(bytes, data_len);
961
962 if (!bio) {
963 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
964 nr_pages -= nr_vecs;
965 /*
966 * Calls bio_kmalloc() and sets bio->bi_end_io()
967 */
968 bio = pscsi_get_bio(nr_vecs);
969 if (!bio)
970 goto fail;
971
972 if (rw)
973 bio->bi_rw |= REQ_WRITE;
974
975 pr_debug("PSCSI: Allocated bio: %p,"
976 " dir: %s nr_vecs: %d\n", bio,
977 (rw) ? "rw" : "r", nr_vecs);
978 /*
979 * Set *hbio pointer to handle the case:
980 * nr_pages > BIO_MAX_PAGES, where additional
981 * bios need to be added to complete a given
982 * command.
983 */
984 if (!*hbio)
985 *hbio = tbio = bio;
986 else
987 tbio = tbio->bi_next = bio;
988 }
989
990 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
991 " bio: %p page: %p len: %d off: %d\n", i, bio,
992 page, len, off);
993
994 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
995 bio, page, bytes, off);
996 if (rc != bytes)
997 goto fail;
998
999 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1000 bio->bi_vcnt, nr_vecs);
1001
1002 if (bio->bi_vcnt > nr_vecs) {
1003 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1004 " %d i: %d bio: %p, allocating another"
1005 " bio\n", bio->bi_vcnt, i, bio);
1006 /*
1007 * Clear the pointer so that another bio will
1008 * be allocated with pscsi_get_bio() above, the
1009 * current bio has already been set *tbio and
1010 * bio->bi_next.
1011 */
1012 bio = NULL;
1013 }
1014
1015 page++;
1016 len -= bytes;
1017 data_len -= bytes;
1018 off = 0;
1019 }
1020 }
1021
1022 return sgl_nents;
1023 fail:
1024 while (*hbio) {
1025 bio = *hbio;
1026 *hbio = (*hbio)->bi_next;
1027 bio->bi_next = NULL;
1028 bio_endio(bio, 0); /* XXX: should be error */
1029 }
1030 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1031 return -ENOMEM;
1032 }
1033
1034 /*
1035 * Clear a lun set in the cdb if the initiator talking to use spoke
1036 * and old standards version, as we can't assume the underlying device
1037 * won't choke up on it.
1038 */
1039 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1040 {
1041 switch (cdb[0]) {
1042 case READ_10: /* SBC - RDProtect */
1043 case READ_12: /* SBC - RDProtect */
1044 case READ_16: /* SBC - RDProtect */
1045 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046 case VERIFY: /* SBC - VRProtect */
1047 case VERIFY_16: /* SBC - VRProtect */
1048 case WRITE_VERIFY: /* SBC - VRProtect */
1049 case WRITE_VERIFY_12: /* SBC - VRProtect */
1050 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051 break;
1052 default:
1053 cdb[1] &= 0x1f; /* clear logical unit number */
1054 break;
1055 }
1056 }
1057
1058 static int pscsi_parse_cdb(struct se_cmd *cmd)
1059 {
1060 unsigned char *cdb = cmd->t_task_cdb;
1061 unsigned int dummy_size;
1062 int ret;
1063
1064 if (cmd->se_cmd_flags & SCF_BIDI) {
1065 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1066 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1067 return -EINVAL;
1068 }
1069
1070 pscsi_clear_cdb_lun(cdb);
1071
1072 /*
1073 * For REPORT LUNS we always need to emulate the response, for everything
1074 * else the default for pSCSI is to pass the command to the underlying
1075 * LLD / physical hardware.
1076 */
1077 switch (cdb[0]) {
1078 case REPORT_LUNS:
1079 ret = spc_parse_cdb(cmd, &dummy_size);
1080 if (ret)
1081 return ret;
1082 break;
1083 case READ_6:
1084 case READ_10:
1085 case READ_12:
1086 case READ_16:
1087 case WRITE_6:
1088 case WRITE_10:
1089 case WRITE_12:
1090 case WRITE_16:
1091 case WRITE_VERIFY:
1092 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1093 /* FALLTHROUGH*/
1094 default:
1095 cmd->execute_cmd = pscsi_execute_cmd;
1096 break;
1097 }
1098
1099 return 0;
1100 }
1101
1102 static int pscsi_execute_cmd(struct se_cmd *cmd)
1103 {
1104 struct scatterlist *sgl = cmd->t_data_sg;
1105 u32 sgl_nents = cmd->t_data_nents;
1106 enum dma_data_direction data_direction = cmd->data_direction;
1107 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1108 struct pscsi_plugin_task *pt;
1109 struct request *req;
1110 struct bio *hbio;
1111 int ret;
1112
1113 /*
1114 * Dynamically alloc cdb space, since it may be larger than
1115 * TCM_MAX_COMMAND_SIZE
1116 */
1117 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1118 if (!pt) {
1119 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1120 return -ENOMEM;
1121 }
1122 cmd->priv = pt;
1123
1124 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1125 scsi_command_size(cmd->t_task_cdb));
1126
1127 if (!sgl) {
1128 req = blk_get_request(pdv->pdv_sd->request_queue,
1129 (data_direction == DMA_TO_DEVICE),
1130 GFP_KERNEL);
1131 if (!req || IS_ERR(req)) {
1132 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1133 req ? IS_ERR(req) : -ENOMEM);
1134 cmd->scsi_sense_reason =
1135 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1136 goto fail;
1137 }
1138 } else {
1139 BUG_ON(!cmd->data_length);
1140
1141 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1142 if (ret < 0) {
1143 cmd->scsi_sense_reason =
1144 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1145 goto fail;
1146 }
1147
1148 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1149 GFP_KERNEL);
1150 if (IS_ERR(req)) {
1151 pr_err("pSCSI: blk_make_request() failed\n");
1152 goto fail_free_bio;
1153 }
1154 }
1155
1156 req->cmd_type = REQ_TYPE_BLOCK_PC;
1157 req->end_io = pscsi_req_done;
1158 req->end_io_data = cmd;
1159 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1160 req->cmd = &pt->pscsi_cdb[0];
1161 req->sense = &pt->pscsi_sense[0];
1162 req->sense_len = 0;
1163 if (pdv->pdv_sd->type == TYPE_DISK)
1164 req->timeout = PS_TIMEOUT_DISK;
1165 else
1166 req->timeout = PS_TIMEOUT_OTHER;
1167 req->retries = PS_RETRY;
1168
1169 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1170 (cmd->sam_task_attr == MSG_HEAD_TAG),
1171 pscsi_req_done);
1172
1173 return 0;
1174
1175 fail_free_bio:
1176 while (hbio) {
1177 struct bio *bio = hbio;
1178 hbio = hbio->bi_next;
1179 bio->bi_next = NULL;
1180 bio_endio(bio, 0); /* XXX: should be error */
1181 }
1182 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1183 fail:
1184 kfree(pt);
1185 return -ENOMEM;
1186 }
1187
1188 /* pscsi_get_device_rev():
1189 *
1190 *
1191 */
1192 static u32 pscsi_get_device_rev(struct se_device *dev)
1193 {
1194 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1195 struct scsi_device *sd = pdv->pdv_sd;
1196
1197 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1198 }
1199
1200 /* pscsi_get_device_type():
1201 *
1202 *
1203 */
1204 static u32 pscsi_get_device_type(struct se_device *dev)
1205 {
1206 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1207 struct scsi_device *sd = pdv->pdv_sd;
1208
1209 return sd->type;
1210 }
1211
1212 static sector_t pscsi_get_blocks(struct se_device *dev)
1213 {
1214 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1215
1216 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1217 return pdv->pdv_bd->bd_part->nr_sects;
1218
1219 dump_stack();
1220 return 0;
1221 }
1222
1223 static void pscsi_req_done(struct request *req, int uptodate)
1224 {
1225 struct se_cmd *cmd = req->end_io_data;
1226 struct pscsi_plugin_task *pt = cmd->priv;
1227
1228 pt->pscsi_result = req->errors;
1229 pt->pscsi_resid = req->resid_len;
1230
1231 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1232 if (cmd->scsi_status) {
1233 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1234 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1235 pt->pscsi_result);
1236 }
1237
1238 switch (host_byte(pt->pscsi_result)) {
1239 case DID_OK:
1240 target_complete_cmd(cmd, cmd->scsi_status);
1241 break;
1242 default:
1243 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1244 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1245 pt->pscsi_result);
1246 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1247 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1248 break;
1249 }
1250
1251 __blk_put_request(req->q, req);
1252 kfree(pt);
1253 }
1254
1255 static struct se_subsystem_api pscsi_template = {
1256 .name = "pscsi",
1257 .owner = THIS_MODULE,
1258 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1259 .attach_hba = pscsi_attach_hba,
1260 .detach_hba = pscsi_detach_hba,
1261 .pmode_enable_hba = pscsi_pmode_enable_hba,
1262 .allocate_virtdevice = pscsi_allocate_virtdevice,
1263 .create_virtdevice = pscsi_create_virtdevice,
1264 .free_device = pscsi_free_device,
1265 .transport_complete = pscsi_transport_complete,
1266 .parse_cdb = pscsi_parse_cdb,
1267 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1268 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1269 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1270 .get_device_rev = pscsi_get_device_rev,
1271 .get_device_type = pscsi_get_device_type,
1272 .get_blocks = pscsi_get_blocks,
1273 };
1274
1275 static int __init pscsi_module_init(void)
1276 {
1277 return transport_subsystem_register(&pscsi_template);
1278 }
1279
1280 static void pscsi_module_exit(void)
1281 {
1282 transport_subsystem_release(&pscsi_template);
1283 }
1284
1285 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1286 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1287 MODULE_LICENSE("GPL");
1288
1289 module_init(pscsi_module_init);
1290 module_exit(pscsi_module_exit);
Linux ARM platform port for MOXA ART SoC