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[deliverable/linux.git] / drivers / target / target_core_pscsi.c
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/file.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_tcq.h>
44
45 #include <target/target_core_base.h>
46 #include <target/target_core_device.h>
47 #include <target/target_core_transport.h>
48
49 #include "target_core_pscsi.h"
50
51 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
52
53 static struct se_subsystem_api pscsi_template;
54
55 static void pscsi_req_done(struct request *, int);
56
57 /* pscsi_attach_hba():
58 *
59 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
60 * from the passed SCSI Host ID.
61 */
62 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
63 {
64 struct pscsi_hba_virt *phv;
65
66 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
67 if (!phv) {
68 pr_err("Unable to allocate struct pscsi_hba_virt\n");
69 return -ENOMEM;
70 }
71 phv->phv_host_id = host_id;
72 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
73
74 hba->hba_ptr = phv;
75
76 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
77 " Generic Target Core Stack %s\n", hba->hba_id,
78 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
79 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
80 hba->hba_id);
81
82 return 0;
83 }
84
85 static void pscsi_detach_hba(struct se_hba *hba)
86 {
87 struct pscsi_hba_virt *phv = hba->hba_ptr;
88 struct Scsi_Host *scsi_host = phv->phv_lld_host;
89
90 if (scsi_host) {
91 scsi_host_put(scsi_host);
92
93 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
94 " Generic Target Core\n", hba->hba_id,
95 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
96 "Unknown");
97 } else
98 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
99 " from Generic Target Core\n", hba->hba_id);
100
101 kfree(phv);
102 hba->hba_ptr = NULL;
103 }
104
105 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
106 {
107 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
108 struct Scsi_Host *sh = phv->phv_lld_host;
109 /*
110 * Release the struct Scsi_Host
111 */
112 if (!mode_flag) {
113 if (!sh)
114 return 0;
115
116 phv->phv_lld_host = NULL;
117 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
118
119 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
120 " %s\n", hba->hba_id, (sh->hostt->name) ?
121 (sh->hostt->name) : "Unknown");
122
123 scsi_host_put(sh);
124 return 0;
125 }
126 /*
127 * Otherwise, locate struct Scsi_Host from the original passed
128 * pSCSI Host ID and enable for phba mode
129 */
130 sh = scsi_host_lookup(phv->phv_host_id);
131 if (IS_ERR(sh)) {
132 pr_err("pSCSI: Unable to locate SCSI Host for"
133 " phv_host_id: %d\n", phv->phv_host_id);
134 return PTR_ERR(sh);
135 }
136
137 phv->phv_lld_host = sh;
138 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
139
140 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
141 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
142
143 return 1;
144 }
145
146 static void pscsi_tape_read_blocksize(struct se_device *dev,
147 struct scsi_device *sdev)
148 {
149 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
150 int ret;
151
152 buf = kzalloc(12, GFP_KERNEL);
153 if (!buf)
154 return;
155
156 memset(cdb, 0, MAX_COMMAND_SIZE);
157 cdb[0] = MODE_SENSE;
158 cdb[4] = 0x0c; /* 12 bytes */
159
160 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
161 HZ, 1, NULL);
162 if (ret)
163 goto out_free;
164
165 /*
166 * If MODE_SENSE still returns zero, set the default value to 1024.
167 */
168 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
169 if (!sdev->sector_size)
170 sdev->sector_size = 1024;
171 out_free:
172 kfree(buf);
173 }
174
175 static void
176 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
177 {
178 unsigned char *buf;
179
180 if (sdev->inquiry_len < INQUIRY_LEN)
181 return;
182
183 buf = sdev->inquiry;
184 if (!buf)
185 return;
186 /*
187 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
188 */
189 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
190 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
191 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
192 }
193
194 static int
195 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
196 {
197 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
198 int ret;
199
200 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
201 if (!buf)
202 return -ENOMEM;
203
204 memset(cdb, 0, MAX_COMMAND_SIZE);
205 cdb[0] = INQUIRY;
206 cdb[1] = 0x01; /* Query VPD */
207 cdb[2] = 0x80; /* Unit Serial Number */
208 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
209 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
210
211 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
212 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
213 if (ret)
214 goto out_free;
215
216 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
217
218 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
219
220 kfree(buf);
221 return 0;
222
223 out_free:
224 kfree(buf);
225 return -EPERM;
226 }
227
228 static void
229 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
230 struct t10_wwn *wwn)
231 {
232 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
233 int ident_len, page_len, off = 4, ret;
234 struct t10_vpd *vpd;
235
236 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
237 if (!buf)
238 return;
239
240 memset(cdb, 0, MAX_COMMAND_SIZE);
241 cdb[0] = INQUIRY;
242 cdb[1] = 0x01; /* Query VPD */
243 cdb[2] = 0x83; /* Device Identifier */
244 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
245 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
246
247 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
248 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
249 NULL, HZ, 1, NULL);
250 if (ret)
251 goto out;
252
253 page_len = (buf[2] << 8) | buf[3];
254 while (page_len > 0) {
255 /* Grab a pointer to the Identification descriptor */
256 page_83 = &buf[off];
257 ident_len = page_83[3];
258 if (!ident_len) {
259 pr_err("page_83[3]: identifier"
260 " length zero!\n");
261 break;
262 }
263 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
264
265 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
266 if (!vpd) {
267 pr_err("Unable to allocate memory for"
268 " struct t10_vpd\n");
269 goto out;
270 }
271 INIT_LIST_HEAD(&vpd->vpd_list);
272
273 transport_set_vpd_proto_id(vpd, page_83);
274 transport_set_vpd_assoc(vpd, page_83);
275
276 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
277 off += (ident_len + 4);
278 page_len -= (ident_len + 4);
279 kfree(vpd);
280 continue;
281 }
282 if (transport_set_vpd_ident(vpd, page_83) < 0) {
283 off += (ident_len + 4);
284 page_len -= (ident_len + 4);
285 kfree(vpd);
286 continue;
287 }
288
289 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
290 off += (ident_len + 4);
291 page_len -= (ident_len + 4);
292 }
293
294 out:
295 kfree(buf);
296 }
297
298 /* pscsi_add_device_to_list():
299 *
300 *
301 */
302 static struct se_device *pscsi_add_device_to_list(
303 struct se_hba *hba,
304 struct se_subsystem_dev *se_dev,
305 struct pscsi_dev_virt *pdv,
306 struct scsi_device *sd,
307 int dev_flags)
308 {
309 struct se_device *dev;
310 struct se_dev_limits dev_limits;
311 struct request_queue *q;
312 struct queue_limits *limits;
313
314 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
315
316 if (!sd->queue_depth) {
317 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
318
319 pr_err("Set broken SCSI Device %d:%d:%d"
320 " queue_depth to %d\n", sd->channel, sd->id,
321 sd->lun, sd->queue_depth);
322 }
323 /*
324 * Setup the local scope queue_limits from struct request_queue->limits
325 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
326 */
327 q = sd->request_queue;
328 limits = &dev_limits.limits;
329 limits->logical_block_size = sd->sector_size;
330 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
331 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
332 dev_limits.hw_queue_depth = sd->queue_depth;
333 dev_limits.queue_depth = sd->queue_depth;
334 /*
335 * Setup our standard INQUIRY info into se_dev->t10_wwn
336 */
337 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
338
339 /*
340 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
341 * which has already been referenced with Linux SCSI code with
342 * scsi_device_get() in this file's pscsi_create_virtdevice().
343 *
344 * The passthrough operations called by the transport_add_device_*
345 * function below will require this pointer to be set for passthroug
346 * ops.
347 *
348 * For the shutdown case in pscsi_free_device(), this struct
349 * scsi_device reference is released with Linux SCSI code
350 * scsi_device_put() and the pdv->pdv_sd cleared.
351 */
352 pdv->pdv_sd = sd;
353
354 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
355 se_dev, dev_flags, pdv,
356 &dev_limits, NULL, NULL);
357 if (!dev) {
358 pdv->pdv_sd = NULL;
359 return NULL;
360 }
361
362 /*
363 * Locate VPD WWN Information used for various purposes within
364 * the Storage Engine.
365 */
366 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
367 /*
368 * If VPD Unit Serial returned GOOD status, try
369 * VPD Device Identification page (0x83).
370 */
371 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
372 }
373
374 /*
375 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
376 */
377 if (sd->type == TYPE_TAPE)
378 pscsi_tape_read_blocksize(dev, sd);
379 return dev;
380 }
381
382 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
383 {
384 struct pscsi_dev_virt *pdv;
385
386 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
387 if (!pdv) {
388 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
389 return NULL;
390 }
391 pdv->pdv_se_hba = hba;
392
393 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
394 return pdv;
395 }
396
397 /*
398 * Called with struct Scsi_Host->host_lock called.
399 */
400 static struct se_device *pscsi_create_type_disk(
401 struct scsi_device *sd,
402 struct pscsi_dev_virt *pdv,
403 struct se_subsystem_dev *se_dev,
404 struct se_hba *hba)
405 __releases(sh->host_lock)
406 {
407 struct se_device *dev;
408 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
409 struct Scsi_Host *sh = sd->host;
410 struct block_device *bd;
411 u32 dev_flags = 0;
412
413 if (scsi_device_get(sd)) {
414 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
415 sh->host_no, sd->channel, sd->id, sd->lun);
416 spin_unlock_irq(sh->host_lock);
417 return NULL;
418 }
419 spin_unlock_irq(sh->host_lock);
420 /*
421 * Claim exclusive struct block_device access to struct scsi_device
422 * for TYPE_DISK using supplied udev_path
423 */
424 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
425 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
426 if (IS_ERR(bd)) {
427 pr_err("pSCSI: blkdev_get_by_path() failed\n");
428 scsi_device_put(sd);
429 return NULL;
430 }
431 pdv->pdv_bd = bd;
432
433 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
434 if (!dev) {
435 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
436 scsi_device_put(sd);
437 return NULL;
438 }
439 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
440 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
441
442 return dev;
443 }
444
445 /*
446 * Called with struct Scsi_Host->host_lock called.
447 */
448 static struct se_device *pscsi_create_type_rom(
449 struct scsi_device *sd,
450 struct pscsi_dev_virt *pdv,
451 struct se_subsystem_dev *se_dev,
452 struct se_hba *hba)
453 __releases(sh->host_lock)
454 {
455 struct se_device *dev;
456 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
457 struct Scsi_Host *sh = sd->host;
458 u32 dev_flags = 0;
459
460 if (scsi_device_get(sd)) {
461 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
462 sh->host_no, sd->channel, sd->id, sd->lun);
463 spin_unlock_irq(sh->host_lock);
464 return NULL;
465 }
466 spin_unlock_irq(sh->host_lock);
467
468 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
469 if (!dev) {
470 scsi_device_put(sd);
471 return NULL;
472 }
473 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
474 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
475 sd->channel, sd->id, sd->lun);
476
477 return dev;
478 }
479
480 /*
481 *Called with struct Scsi_Host->host_lock called.
482 */
483 static struct se_device *pscsi_create_type_other(
484 struct scsi_device *sd,
485 struct pscsi_dev_virt *pdv,
486 struct se_subsystem_dev *se_dev,
487 struct se_hba *hba)
488 __releases(sh->host_lock)
489 {
490 struct se_device *dev;
491 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
492 struct Scsi_Host *sh = sd->host;
493 u32 dev_flags = 0;
494
495 spin_unlock_irq(sh->host_lock);
496 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
497 if (!dev)
498 return NULL;
499
500 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
501 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
502 sd->channel, sd->id, sd->lun);
503
504 return dev;
505 }
506
507 static struct se_device *pscsi_create_virtdevice(
508 struct se_hba *hba,
509 struct se_subsystem_dev *se_dev,
510 void *p)
511 {
512 struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
513 struct se_device *dev;
514 struct scsi_device *sd;
515 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
516 struct Scsi_Host *sh = phv->phv_lld_host;
517 int legacy_mode_enable = 0;
518
519 if (!pdv) {
520 pr_err("Unable to locate struct pscsi_dev_virt"
521 " parameter\n");
522 return ERR_PTR(-EINVAL);
523 }
524 /*
525 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
526 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
527 */
528 if (!sh) {
529 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
530 pr_err("pSCSI: Unable to locate struct"
531 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
532 return ERR_PTR(-ENODEV);
533 }
534 /*
535 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
536 * reference, we enforce that udev_path has been set
537 */
538 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
539 pr_err("pSCSI: udev_path attribute has not"
540 " been set before ENABLE=1\n");
541 return ERR_PTR(-EINVAL);
542 }
543 /*
544 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
545 * use the original TCM hba ID to reference Linux/SCSI Host No
546 * and enable for PHV_LLD_SCSI_HOST_NO mode.
547 */
548 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
549 spin_lock(&hba->device_lock);
550 if (!list_empty(&hba->hba_dev_list)) {
551 pr_err("pSCSI: Unable to set hba_mode"
552 " with active devices\n");
553 spin_unlock(&hba->device_lock);
554 return ERR_PTR(-EEXIST);
555 }
556 spin_unlock(&hba->device_lock);
557
558 if (pscsi_pmode_enable_hba(hba, 1) != 1)
559 return ERR_PTR(-ENODEV);
560
561 legacy_mode_enable = 1;
562 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
563 sh = phv->phv_lld_host;
564 } else {
565 sh = scsi_host_lookup(pdv->pdv_host_id);
566 if (IS_ERR(sh)) {
567 pr_err("pSCSI: Unable to locate"
568 " pdv_host_id: %d\n", pdv->pdv_host_id);
569 return (struct se_device *) sh;
570 }
571 }
572 } else {
573 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
574 pr_err("pSCSI: PHV_VIRUTAL_HOST_ID set while"
575 " struct Scsi_Host exists\n");
576 return ERR_PTR(-EEXIST);
577 }
578 }
579
580 spin_lock_irq(sh->host_lock);
581 list_for_each_entry(sd, &sh->__devices, siblings) {
582 if ((pdv->pdv_channel_id != sd->channel) ||
583 (pdv->pdv_target_id != sd->id) ||
584 (pdv->pdv_lun_id != sd->lun))
585 continue;
586 /*
587 * Functions will release the held struct scsi_host->host_lock
588 * before calling calling pscsi_add_device_to_list() to register
589 * struct scsi_device with target_core_mod.
590 */
591 switch (sd->type) {
592 case TYPE_DISK:
593 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
594 break;
595 case TYPE_ROM:
596 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
597 break;
598 default:
599 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
600 break;
601 }
602
603 if (!dev) {
604 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
605 scsi_host_put(sh);
606 else if (legacy_mode_enable) {
607 pscsi_pmode_enable_hba(hba, 0);
608 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
609 }
610 pdv->pdv_sd = NULL;
611 return ERR_PTR(-ENODEV);
612 }
613 return dev;
614 }
615 spin_unlock_irq(sh->host_lock);
616
617 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
618 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
619
620 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
621 scsi_host_put(sh);
622 else if (legacy_mode_enable) {
623 pscsi_pmode_enable_hba(hba, 0);
624 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
625 }
626
627 return ERR_PTR(-ENODEV);
628 }
629
630 /* pscsi_free_device(): (Part of se_subsystem_api_t template)
631 *
632 *
633 */
634 static void pscsi_free_device(void *p)
635 {
636 struct pscsi_dev_virt *pdv = p;
637 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
638 struct scsi_device *sd = pdv->pdv_sd;
639
640 if (sd) {
641 /*
642 * Release exclusive pSCSI internal struct block_device claim for
643 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
644 */
645 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
646 blkdev_put(pdv->pdv_bd,
647 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
648 pdv->pdv_bd = NULL;
649 }
650 /*
651 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
652 * to struct Scsi_Host now.
653 */
654 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
655 (phv->phv_lld_host != NULL))
656 scsi_host_put(phv->phv_lld_host);
657
658 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
659 scsi_device_put(sd);
660
661 pdv->pdv_sd = NULL;
662 }
663
664 kfree(pdv);
665 }
666
667 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
668 {
669 return container_of(task, struct pscsi_plugin_task, pscsi_task);
670 }
671
672
673 /* pscsi_transport_complete():
674 *
675 *
676 */
677 static int pscsi_transport_complete(struct se_task *task)
678 {
679 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
680 struct scsi_device *sd = pdv->pdv_sd;
681 int result;
682 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
683 unsigned char *cdb = &pt->pscsi_cdb[0];
684
685 result = pt->pscsi_result;
686 /*
687 * Hack to make sure that Write-Protect modepage is set if R/O mode is
688 * forced.
689 */
690 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
691 (status_byte(result) << 1) == SAM_STAT_GOOD) {
692 if (!task->task_se_cmd->se_deve)
693 goto after_mode_sense;
694
695 if (task->task_se_cmd->se_deve->lun_flags &
696 TRANSPORT_LUNFLAGS_READ_ONLY) {
697 unsigned char *buf = transport_kmap_first_data_page(task->task_se_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_first_data_page(task->task_se_cmd);
708 }
709 }
710 after_mode_sense:
711
712 if (sd->type != TYPE_TAPE)
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 struct scatterlist *sg = task->task_sg;
727 u16 bdl;
728 u32 blocksize;
729
730 buf = sg_virt(&sg[0]);
731 if (!buf) {
732 pr_err("Unable to get buf for scatterlist\n");
733 goto after_mode_select;
734 }
735
736 if (cdb[0] == MODE_SELECT)
737 bdl = (buf[3]);
738 else
739 bdl = (buf[6] << 8) | (buf[7]);
740
741 if (!bdl)
742 goto after_mode_select;
743
744 if (cdb[0] == MODE_SELECT)
745 blocksize = (buf[9] << 16) | (buf[10] << 8) |
746 (buf[11]);
747 else
748 blocksize = (buf[13] << 16) | (buf[14] << 8) |
749 (buf[15]);
750
751 sd->sector_size = blocksize;
752 }
753 after_mode_select:
754
755 if (status_byte(result) & CHECK_CONDITION)
756 return 1;
757
758 return 0;
759 }
760
761 static struct se_task *
762 pscsi_alloc_task(unsigned char *cdb)
763 {
764 struct pscsi_plugin_task *pt;
765
766 /*
767 * Dynamically alloc cdb space, since it may be larger than
768 * TCM_MAX_COMMAND_SIZE
769 */
770 pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL);
771 if (!pt) {
772 pr_err("Unable to allocate struct pscsi_plugin_task\n");
773 return NULL;
774 }
775
776 return &pt->pscsi_task;
777 }
778
779 static inline void pscsi_blk_init_request(
780 struct se_task *task,
781 struct pscsi_plugin_task *pt,
782 struct request *req,
783 int bidi_read)
784 {
785 /*
786 * Defined as "scsi command" in include/linux/blkdev.h.
787 */
788 req->cmd_type = REQ_TYPE_BLOCK_PC;
789 /*
790 * For the extra BIDI-COMMAND READ struct request we do not
791 * need to setup the remaining structure members
792 */
793 if (bidi_read)
794 return;
795 /*
796 * Setup the done function pointer for struct request,
797 * also set the end_io_data pointer.to struct se_task.
798 */
799 req->end_io = pscsi_req_done;
800 req->end_io_data = task;
801 /*
802 * Load the referenced struct se_task's SCSI CDB into
803 * include/linux/blkdev.h:struct request->cmd
804 */
805 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
806 req->cmd = &pt->pscsi_cdb[0];
807 /*
808 * Setup pointer for outgoing sense data.
809 */
810 req->sense = &pt->pscsi_sense[0];
811 req->sense_len = 0;
812 }
813
814 /*
815 * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
816 */
817 static int pscsi_blk_get_request(struct se_task *task)
818 {
819 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
820 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
821
822 pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
823 (task->task_data_direction == DMA_TO_DEVICE),
824 GFP_KERNEL);
825 if (!pt->pscsi_req || IS_ERR(pt->pscsi_req)) {
826 pr_err("PSCSI: blk_get_request() failed: %ld\n",
827 IS_ERR(pt->pscsi_req));
828 return PYX_TRANSPORT_LU_COMM_FAILURE;
829 }
830 /*
831 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
832 * and setup rq callback, CDB and sense.
833 */
834 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
835 return 0;
836 }
837
838 /* pscsi_do_task(): (Part of se_subsystem_api_t template)
839 *
840 *
841 */
842 static int pscsi_do_task(struct se_task *task)
843 {
844 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
845 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
846 /*
847 * Set the struct request->timeout value based on peripheral
848 * device type from SCSI.
849 */
850 if (pdv->pdv_sd->type == TYPE_DISK)
851 pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
852 else
853 pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
854
855 pt->pscsi_req->retries = PS_RETRY;
856 /*
857 * Queue the struct request into the struct scsi_device->request_queue.
858 * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
859 * descriptor
860 */
861 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
862 (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
863 pscsi_req_done);
864
865 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
866 }
867
868 static void pscsi_free_task(struct se_task *task)
869 {
870 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
871
872 /*
873 * We do not release the bio(s) here associated with this task, as
874 * this is handled by bio_put() and pscsi_bi_endio().
875 */
876 kfree(pt);
877 }
878
879 enum {
880 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
881 Opt_scsi_lun_id, Opt_err
882 };
883
884 static match_table_t tokens = {
885 {Opt_scsi_host_id, "scsi_host_id=%d"},
886 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
887 {Opt_scsi_target_id, "scsi_target_id=%d"},
888 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
889 {Opt_err, NULL}
890 };
891
892 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
893 struct se_subsystem_dev *se_dev,
894 const char *page,
895 ssize_t count)
896 {
897 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
898 struct pscsi_hba_virt *phv = hba->hba_ptr;
899 char *orig, *ptr, *opts;
900 substring_t args[MAX_OPT_ARGS];
901 int ret = 0, arg, token;
902
903 opts = kstrdup(page, GFP_KERNEL);
904 if (!opts)
905 return -ENOMEM;
906
907 orig = opts;
908
909 while ((ptr = strsep(&opts, ",")) != NULL) {
910 if (!*ptr)
911 continue;
912
913 token = match_token(ptr, tokens, args);
914 switch (token) {
915 case Opt_scsi_host_id:
916 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
917 pr_err("PSCSI[%d]: Unable to accept"
918 " scsi_host_id while phv_mode =="
919 " PHV_LLD_SCSI_HOST_NO\n",
920 phv->phv_host_id);
921 ret = -EINVAL;
922 goto out;
923 }
924 match_int(args, &arg);
925 pdv->pdv_host_id = arg;
926 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
927 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
928 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
929 break;
930 case Opt_scsi_channel_id:
931 match_int(args, &arg);
932 pdv->pdv_channel_id = arg;
933 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
934 " ID: %d\n", phv->phv_host_id,
935 pdv->pdv_channel_id);
936 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
937 break;
938 case Opt_scsi_target_id:
939 match_int(args, &arg);
940 pdv->pdv_target_id = arg;
941 pr_debug("PSCSI[%d]: Referencing SCSI Target"
942 " ID: %d\n", phv->phv_host_id,
943 pdv->pdv_target_id);
944 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
945 break;
946 case Opt_scsi_lun_id:
947 match_int(args, &arg);
948 pdv->pdv_lun_id = arg;
949 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
950 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
951 pdv->pdv_flags |= PDF_HAS_LUN_ID;
952 break;
953 default:
954 break;
955 }
956 }
957
958 out:
959 kfree(orig);
960 return (!ret) ? count : ret;
961 }
962
963 static ssize_t pscsi_check_configfs_dev_params(
964 struct se_hba *hba,
965 struct se_subsystem_dev *se_dev)
966 {
967 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
968
969 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
970 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
971 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
972 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
973 " scsi_lun_id= parameters\n");
974 return -EINVAL;
975 }
976
977 return 0;
978 }
979
980 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
981 struct se_subsystem_dev *se_dev,
982 char *b)
983 {
984 struct pscsi_hba_virt *phv = hba->hba_ptr;
985 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
986 struct scsi_device *sd = pdv->pdv_sd;
987 unsigned char host_id[16];
988 ssize_t bl;
989 int i;
990
991 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
992 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
993 else
994 snprintf(host_id, 16, "PHBA Mode");
995
996 bl = sprintf(b, "SCSI Device Bus Location:"
997 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
998 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
999 host_id);
1000
1001 if (sd) {
1002 bl += sprintf(b + bl, " ");
1003 bl += sprintf(b + bl, "Vendor: ");
1004 for (i = 0; i < 8; i++) {
1005 if (ISPRINT(sd->vendor[i])) /* printable character? */
1006 bl += sprintf(b + bl, "%c", sd->vendor[i]);
1007 else
1008 bl += sprintf(b + bl, " ");
1009 }
1010 bl += sprintf(b + bl, " Model: ");
1011 for (i = 0; i < 16; i++) {
1012 if (ISPRINT(sd->model[i])) /* printable character ? */
1013 bl += sprintf(b + bl, "%c", sd->model[i]);
1014 else
1015 bl += sprintf(b + bl, " ");
1016 }
1017 bl += sprintf(b + bl, " Rev: ");
1018 for (i = 0; i < 4; i++) {
1019 if (ISPRINT(sd->rev[i])) /* printable character ? */
1020 bl += sprintf(b + bl, "%c", sd->rev[i]);
1021 else
1022 bl += sprintf(b + bl, " ");
1023 }
1024 bl += sprintf(b + bl, "\n");
1025 }
1026 return bl;
1027 }
1028
1029 static void pscsi_bi_endio(struct bio *bio, int error)
1030 {
1031 bio_put(bio);
1032 }
1033
1034 static inline struct bio *pscsi_get_bio(int sg_num)
1035 {
1036 struct bio *bio;
1037 /*
1038 * Use bio_malloc() following the comment in for bio -> struct request
1039 * in block/blk-core.c:blk_make_request()
1040 */
1041 bio = bio_kmalloc(GFP_KERNEL, sg_num);
1042 if (!bio) {
1043 pr_err("PSCSI: bio_kmalloc() failed\n");
1044 return NULL;
1045 }
1046 bio->bi_end_io = pscsi_bi_endio;
1047
1048 return bio;
1049 }
1050
1051 static int __pscsi_map_SG(
1052 struct se_task *task,
1053 struct scatterlist *task_sg,
1054 u32 task_sg_num,
1055 int bidi_read)
1056 {
1057 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1058 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1059 struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
1060 struct page *page;
1061 struct scatterlist *sg;
1062 u32 data_len = task->task_size, i, len, bytes, off;
1063 int nr_pages = (task->task_size + task_sg[0].offset +
1064 PAGE_SIZE - 1) >> PAGE_SHIFT;
1065 int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
1066 int rw = (task->task_data_direction == DMA_TO_DEVICE);
1067
1068 if (!task->task_size)
1069 return 0;
1070 /*
1071 * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
1072 * the bio_vec maplist from task->task_sg ->
1073 * struct scatterlist memory. The struct se_task->task_sg[] currently needs
1074 * to be attached to struct bios for submission to Linux/SCSI using
1075 * struct request to struct scsi_device->request_queue.
1076 *
1077 * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
1078 * is ported to upstream SCSI passthrough functionality that accepts
1079 * struct scatterlist->page_link or struct page as a paraemeter.
1080 */
1081 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
1082
1083 for_each_sg(task_sg, sg, task_sg_num, i) {
1084 page = sg_page(sg);
1085 off = sg->offset;
1086 len = sg->length;
1087
1088 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
1089 page, len, off);
1090
1091 while (len > 0 && data_len > 0) {
1092 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
1093 bytes = min(bytes, data_len);
1094
1095 if (!bio) {
1096 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
1097 nr_pages -= nr_vecs;
1098 /*
1099 * Calls bio_kmalloc() and sets bio->bi_end_io()
1100 */
1101 bio = pscsi_get_bio(nr_vecs);
1102 if (!bio)
1103 goto fail;
1104
1105 if (rw)
1106 bio->bi_rw |= REQ_WRITE;
1107
1108 pr_debug("PSCSI: Allocated bio: %p,"
1109 " dir: %s nr_vecs: %d\n", bio,
1110 (rw) ? "rw" : "r", nr_vecs);
1111 /*
1112 * Set *hbio pointer to handle the case:
1113 * nr_pages > BIO_MAX_PAGES, where additional
1114 * bios need to be added to complete a given
1115 * struct se_task
1116 */
1117 if (!hbio)
1118 hbio = tbio = bio;
1119 else
1120 tbio = tbio->bi_next = bio;
1121 }
1122
1123 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
1124 " bio: %p page: %p len: %d off: %d\n", i, bio,
1125 page, len, off);
1126
1127 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1128 bio, page, bytes, off);
1129 if (rc != bytes)
1130 goto fail;
1131
1132 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1133 bio->bi_vcnt, nr_vecs);
1134
1135 if (bio->bi_vcnt > nr_vecs) {
1136 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1137 " %d i: %d bio: %p, allocating another"
1138 " bio\n", bio->bi_vcnt, i, bio);
1139 /*
1140 * Clear the pointer so that another bio will
1141 * be allocated with pscsi_get_bio() above, the
1142 * current bio has already been set *tbio and
1143 * bio->bi_next.
1144 */
1145 bio = NULL;
1146 }
1147
1148 page++;
1149 len -= bytes;
1150 data_len -= bytes;
1151 off = 0;
1152 }
1153 }
1154 /*
1155 * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
1156 * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
1157 */
1158 if (!bidi_read) {
1159 /*
1160 * Starting with v2.6.31, call blk_make_request() passing in *hbio to
1161 * allocate the pSCSI task a struct request.
1162 */
1163 pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
1164 hbio, GFP_KERNEL);
1165 if (!pt->pscsi_req) {
1166 pr_err("pSCSI: blk_make_request() failed\n");
1167 goto fail;
1168 }
1169 /*
1170 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
1171 * and setup rq callback, CDB and sense.
1172 */
1173 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
1174
1175 return task->task_sg_nents;
1176 }
1177 /*
1178 * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
1179 * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
1180 */
1181 pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
1182 hbio, GFP_KERNEL);
1183 if (!pt->pscsi_req->next_rq) {
1184 pr_err("pSCSI: blk_make_request() failed for BIDI\n");
1185 goto fail;
1186 }
1187 pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
1188
1189 return task->task_sg_nents;
1190 fail:
1191 while (hbio) {
1192 bio = hbio;
1193 hbio = hbio->bi_next;
1194 bio->bi_next = NULL;
1195 bio_endio(bio, 0);
1196 }
1197 return ret;
1198 }
1199
1200 /*
1201 * pSCSI maps both ->map_control_SG() and ->map_data_SG() to a single call.
1202 */
1203 static int pscsi_map_SG(struct se_task *task)
1204 {
1205 int ret;
1206
1207 /*
1208 * Setup the main struct request for the task->task_sg[] payload
1209 */
1210
1211 ret = __pscsi_map_SG(task, task->task_sg, task->task_sg_nents, 0);
1212 if (ret >= 0 && task->task_sg_bidi) {
1213 /*
1214 * If present, set up the extra BIDI-COMMAND SCSI READ
1215 * struct request and payload.
1216 */
1217 ret = __pscsi_map_SG(task, task->task_sg_bidi,
1218 task->task_sg_nents, 1);
1219 }
1220
1221 if (ret < 0)
1222 return PYX_TRANSPORT_LU_COMM_FAILURE;
1223 return 0;
1224 }
1225
1226 static int pscsi_CDB_none(struct se_task *task)
1227 {
1228 return pscsi_blk_get_request(task);
1229 }
1230
1231 /* pscsi_get_cdb():
1232 *
1233 *
1234 */
1235 static unsigned char *pscsi_get_cdb(struct se_task *task)
1236 {
1237 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1238
1239 return pt->pscsi_cdb;
1240 }
1241
1242 /* pscsi_get_sense_buffer():
1243 *
1244 *
1245 */
1246 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1247 {
1248 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1249
1250 return (unsigned char *)&pt->pscsi_sense[0];
1251 }
1252
1253 /* pscsi_get_device_rev():
1254 *
1255 *
1256 */
1257 static u32 pscsi_get_device_rev(struct se_device *dev)
1258 {
1259 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1260 struct scsi_device *sd = pdv->pdv_sd;
1261
1262 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1263 }
1264
1265 /* pscsi_get_device_type():
1266 *
1267 *
1268 */
1269 static u32 pscsi_get_device_type(struct se_device *dev)
1270 {
1271 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1272 struct scsi_device *sd = pdv->pdv_sd;
1273
1274 return sd->type;
1275 }
1276
1277 static sector_t pscsi_get_blocks(struct se_device *dev)
1278 {
1279 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1280
1281 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1282 return pdv->pdv_bd->bd_part->nr_sects;
1283
1284 dump_stack();
1285 return 0;
1286 }
1287
1288 /* pscsi_handle_SAM_STATUS_failures():
1289 *
1290 *
1291 */
1292 static inline void pscsi_process_SAM_status(
1293 struct se_task *task,
1294 struct pscsi_plugin_task *pt)
1295 {
1296 task->task_scsi_status = status_byte(pt->pscsi_result);
1297 if (task->task_scsi_status) {
1298 task->task_scsi_status <<= 1;
1299 pr_debug("PSCSI Status Byte exception at task: %p CDB:"
1300 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1301 pt->pscsi_result);
1302 }
1303
1304 switch (host_byte(pt->pscsi_result)) {
1305 case DID_OK:
1306 transport_complete_task(task, (!task->task_scsi_status));
1307 break;
1308 default:
1309 pr_debug("PSCSI Host Byte exception at task: %p CDB:"
1310 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1311 pt->pscsi_result);
1312 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1313 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1314 task->task_se_cmd->transport_error_status =
1315 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1316 transport_complete_task(task, 0);
1317 break;
1318 }
1319 }
1320
1321 static void pscsi_req_done(struct request *req, int uptodate)
1322 {
1323 struct se_task *task = req->end_io_data;
1324 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1325
1326 pt->pscsi_result = req->errors;
1327 pt->pscsi_resid = req->resid_len;
1328
1329 pscsi_process_SAM_status(task, pt);
1330 /*
1331 * Release BIDI-READ if present
1332 */
1333 if (req->next_rq != NULL)
1334 __blk_put_request(req->q, req->next_rq);
1335
1336 __blk_put_request(req->q, req);
1337 pt->pscsi_req = NULL;
1338 }
1339
1340 static struct se_subsystem_api pscsi_template = {
1341 .name = "pscsi",
1342 .owner = THIS_MODULE,
1343 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1344 .cdb_none = pscsi_CDB_none,
1345 .map_control_SG = pscsi_map_SG,
1346 .map_data_SG = pscsi_map_SG,
1347 .attach_hba = pscsi_attach_hba,
1348 .detach_hba = pscsi_detach_hba,
1349 .pmode_enable_hba = pscsi_pmode_enable_hba,
1350 .allocate_virtdevice = pscsi_allocate_virtdevice,
1351 .create_virtdevice = pscsi_create_virtdevice,
1352 .free_device = pscsi_free_device,
1353 .transport_complete = pscsi_transport_complete,
1354 .alloc_task = pscsi_alloc_task,
1355 .do_task = pscsi_do_task,
1356 .free_task = pscsi_free_task,
1357 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1358 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1359 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1360 .get_cdb = pscsi_get_cdb,
1361 .get_sense_buffer = pscsi_get_sense_buffer,
1362 .get_device_rev = pscsi_get_device_rev,
1363 .get_device_type = pscsi_get_device_type,
1364 .get_blocks = pscsi_get_blocks,
1365 };
1366
1367 static int __init pscsi_module_init(void)
1368 {
1369 return transport_subsystem_register(&pscsi_template);
1370 }
1371
1372 static void pscsi_module_exit(void)
1373 {
1374 transport_subsystem_release(&pscsi_template);
1375 }
1376
1377 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1378 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1379 MODULE_LICENSE("GPL");
1380
1381 module_init(pscsi_module_init);
1382 module_exit(pscsi_module_exit);
Linux kernel - Deliverables
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