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13#include <linux/string.h>
14#include <linux/parser.h>
15#include <linux/timer.h>
16#include <linux/blkdev.h>
17#include <linux/blk_types.h>
18#include <linux/slab.h>
19#include <linux/spinlock.h>
20#include <linux/genhd.h>
21#include <linux/cdrom.h>
22#include <linux/ratelimit.h>
23#include <linux/module.h>
24#include <asm/unaligned.h>
25
26#include <scsi/scsi_device.h>
27#include <scsi/scsi_host.h>
28#include <scsi/scsi_tcq.h>
29
30#include <target/target_core_base.h>
31#include <target/target_core_backend.h>
32
33#include "target_core_alua.h"
34#include "target_core_internal.h"
35#include "target_core_pscsi.h"
36
37static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
38{
39 return container_of(dev, struct pscsi_dev_virt, dev);
40}
41
42static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
43static void pscsi_req_done(struct request *, blk_status_t);
44
45
46
47
48
49
50static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
51{
52 struct pscsi_hba_virt *phv;
53
54 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
55 if (!phv) {
56 pr_err("Unable to allocate struct pscsi_hba_virt\n");
57 return -ENOMEM;
58 }
59 phv->phv_host_id = host_id;
60 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
61
62 hba->hba_ptr = phv;
63
64 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
65 " Generic Target Core Stack %s\n", hba->hba_id,
66 PSCSI_VERSION, TARGET_CORE_VERSION);
67 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
68 hba->hba_id);
69
70 return 0;
71}
72
73static void pscsi_detach_hba(struct se_hba *hba)
74{
75 struct pscsi_hba_virt *phv = hba->hba_ptr;
76 struct Scsi_Host *scsi_host = phv->phv_lld_host;
77
78 if (scsi_host) {
79 scsi_host_put(scsi_host);
80
81 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
82 " Generic Target Core\n", hba->hba_id,
83 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
84 "Unknown");
85 } else
86 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
87 " from Generic Target Core\n", hba->hba_id);
88
89 kfree(phv);
90 hba->hba_ptr = NULL;
91}
92
93static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
94{
95 struct pscsi_hba_virt *phv = hba->hba_ptr;
96 struct Scsi_Host *sh = phv->phv_lld_host;
97
98
99
100 if (!mode_flag) {
101 if (!sh)
102 return 0;
103
104 phv->phv_lld_host = NULL;
105 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
106
107 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
108 " %s\n", hba->hba_id, (sh->hostt->name) ?
109 (sh->hostt->name) : "Unknown");
110
111 scsi_host_put(sh);
112 return 0;
113 }
114
115
116
117
118 sh = scsi_host_lookup(phv->phv_host_id);
119 if (!sh) {
120 pr_err("pSCSI: Unable to locate SCSI Host for"
121 " phv_host_id: %d\n", phv->phv_host_id);
122 return -EINVAL;
123 }
124
125 phv->phv_lld_host = sh;
126 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
127
128 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
129 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
130
131 return 1;
132}
133
134static void pscsi_tape_read_blocksize(struct se_device *dev,
135 struct scsi_device *sdev)
136{
137 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
138 int ret;
139
140 buf = kzalloc(12, GFP_KERNEL);
141 if (!buf)
142 goto out_free;
143
144 memset(cdb, 0, MAX_COMMAND_SIZE);
145 cdb[0] = MODE_SENSE;
146 cdb[4] = 0x0c;
147
148 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
149 HZ, 1, NULL);
150 if (ret)
151 goto out_free;
152
153
154
155
156 sdev->sector_size = get_unaligned_be24(&buf[9]);
157out_free:
158 if (!sdev->sector_size)
159 sdev->sector_size = 1024;
160
161 kfree(buf);
162}
163
164static void
165pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
166{
167 if (sdev->inquiry_len < INQUIRY_LEN)
168 return;
169
170
171
172 BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1);
173 snprintf(wwn->vendor, sizeof(wwn->vendor),
174 "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor);
175 BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1);
176 snprintf(wwn->model, sizeof(wwn->model),
177 "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model);
178 BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1);
179 snprintf(wwn->revision, sizeof(wwn->revision),
180 "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev);
181}
182
183static int
184pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
185{
186 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
187 int ret;
188
189 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
190 if (!buf)
191 return -ENOMEM;
192
193 memset(cdb, 0, MAX_COMMAND_SIZE);
194 cdb[0] = INQUIRY;
195 cdb[1] = 0x01;
196 cdb[2] = 0x80;
197 put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]);
198
199 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
200 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
201 if (ret)
202 goto out_free;
203
204 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
205
206 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
207
208 kfree(buf);
209 return 0;
210
211out_free:
212 kfree(buf);
213 return -EPERM;
214}
215
216static void
217pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
218 struct t10_wwn *wwn)
219{
220 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
221 int ident_len, page_len, off = 4, ret;
222 struct t10_vpd *vpd;
223
224 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
225 if (!buf)
226 return;
227
228 memset(cdb, 0, MAX_COMMAND_SIZE);
229 cdb[0] = INQUIRY;
230 cdb[1] = 0x01;
231 cdb[2] = 0x83;
232 put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]);
233
234 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
235 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
236 NULL, HZ, 1, NULL);
237 if (ret)
238 goto out;
239
240 page_len = get_unaligned_be16(&buf[2]);
241 while (page_len > 0) {
242
243 page_83 = &buf[off];
244 ident_len = page_83[3];
245 if (!ident_len) {
246 pr_err("page_83[3]: identifier"
247 " length zero!\n");
248 break;
249 }
250 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
251
252 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
253 if (!vpd) {
254 pr_err("Unable to allocate memory for"
255 " struct t10_vpd\n");
256 goto out;
257 }
258 INIT_LIST_HEAD(&vpd->vpd_list);
259
260 transport_set_vpd_proto_id(vpd, page_83);
261 transport_set_vpd_assoc(vpd, page_83);
262
263 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
264 off += (ident_len + 4);
265 page_len -= (ident_len + 4);
266 kfree(vpd);
267 continue;
268 }
269 if (transport_set_vpd_ident(vpd, page_83) < 0) {
270 off += (ident_len + 4);
271 page_len -= (ident_len + 4);
272 kfree(vpd);
273 continue;
274 }
275
276 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
277 off += (ident_len + 4);
278 page_len -= (ident_len + 4);
279 }
280
281out:
282 kfree(buf);
283}
284
285static int pscsi_add_device_to_list(struct se_device *dev,
286 struct scsi_device *sd)
287{
288 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
289 struct request_queue *q = sd->request_queue;
290
291 pdv->pdv_sd = sd;
292
293 if (!sd->queue_depth) {
294 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
295
296 pr_err("Set broken SCSI Device %d:%d:%llu"
297 " queue_depth to %d\n", sd->channel, sd->id,
298 sd->lun, sd->queue_depth);
299 }
300
301 dev->dev_attrib.hw_block_size =
302 min_not_zero((int)sd->sector_size, 512);
303 dev->dev_attrib.hw_max_sectors =
304 min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q));
305 dev->dev_attrib.hw_queue_depth = sd->queue_depth;
306
307
308
309
310 pscsi_set_inquiry_info(sd, &dev->t10_wwn);
311
312
313
314
315
316 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
317
318
319
320
321 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
322 }
323
324
325
326
327 if (sd->type == TYPE_TAPE) {
328 pscsi_tape_read_blocksize(dev, sd);
329 dev->dev_attrib.hw_block_size = sd->sector_size;
330 }
331 return 0;
332}
333
334static struct se_device *pscsi_alloc_device(struct se_hba *hba,
335 const char *name)
336{
337 struct pscsi_dev_virt *pdv;
338
339 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
340 if (!pdv) {
341 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
342 return NULL;
343 }
344
345 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
346 return &pdv->dev;
347}
348
349
350
351
352static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
353 __releases(sh->host_lock)
354{
355 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
356 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
357 struct Scsi_Host *sh = sd->host;
358 struct block_device *bd;
359 int ret;
360
361 if (scsi_device_get(sd)) {
362 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
363 sh->host_no, sd->channel, sd->id, sd->lun);
364 spin_unlock_irq(sh->host_lock);
365 return -EIO;
366 }
367 spin_unlock_irq(sh->host_lock);
368
369
370
371
372 bd = blkdev_get_by_path(dev->udev_path,
373 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
374 if (IS_ERR(bd)) {
375 pr_err("pSCSI: blkdev_get_by_path() failed\n");
376 scsi_device_put(sd);
377 return PTR_ERR(bd);
378 }
379 pdv->pdv_bd = bd;
380
381 ret = pscsi_add_device_to_list(dev, sd);
382 if (ret) {
383 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
384 scsi_device_put(sd);
385 return ret;
386 }
387
388 pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n",
389 phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC",
390 sh->host_no, sd->channel, sd->id, sd->lun);
391 return 0;
392}
393
394
395
396
397static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd)
398 __releases(sh->host_lock)
399{
400 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
401 struct Scsi_Host *sh = sd->host;
402 int ret;
403
404 if (scsi_device_get(sd)) {
405 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
406 sh->host_no, sd->channel, sd->id, sd->lun);
407 spin_unlock_irq(sh->host_lock);
408 return -EIO;
409 }
410 spin_unlock_irq(sh->host_lock);
411
412 ret = pscsi_add_device_to_list(dev, sd);
413 if (ret) {
414 scsi_device_put(sd);
415 return ret;
416 }
417 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
418 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
419 sd->channel, sd->id, sd->lun);
420
421 return 0;
422}
423
424static int pscsi_configure_device(struct se_device *dev)
425{
426 struct se_hba *hba = dev->se_hba;
427 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
428 struct scsi_device *sd;
429 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
430 struct Scsi_Host *sh = phv->phv_lld_host;
431 int legacy_mode_enable = 0;
432 int ret;
433
434 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
435 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
436 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
437 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
438 " scsi_lun_id= parameters\n");
439 return -EINVAL;
440 }
441
442
443
444
445
446 if (!sh) {
447 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
448 pr_err("pSCSI: Unable to locate struct"
449 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
450 return -ENODEV;
451 }
452
453
454
455
456 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
457 pr_err("pSCSI: udev_path attribute has not"
458 " been set before ENABLE=1\n");
459 return -EINVAL;
460 }
461
462
463
464
465
466 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
467 if (hba->dev_count) {
468 pr_err("pSCSI: Unable to set hba_mode"
469 " with active devices\n");
470 return -EEXIST;
471 }
472
473 if (pscsi_pmode_enable_hba(hba, 1) != 1)
474 return -ENODEV;
475
476 legacy_mode_enable = 1;
477 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
478 sh = phv->phv_lld_host;
479 } else {
480 sh = scsi_host_lookup(pdv->pdv_host_id);
481 if (!sh) {
482 pr_err("pSCSI: Unable to locate"
483 " pdv_host_id: %d\n", pdv->pdv_host_id);
484 return -EINVAL;
485 }
486 pdv->pdv_lld_host = sh;
487 }
488 } else {
489 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
490 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
491 " struct Scsi_Host exists\n");
492 return -EEXIST;
493 }
494 }
495
496 spin_lock_irq(sh->host_lock);
497 list_for_each_entry(sd, &sh->__devices, siblings) {
498 if ((pdv->pdv_channel_id != sd->channel) ||
499 (pdv->pdv_target_id != sd->id) ||
500 (pdv->pdv_lun_id != sd->lun))
501 continue;
502
503
504
505
506
507 switch (sd->type) {
508 case TYPE_DISK:
509 case TYPE_ZBC:
510 ret = pscsi_create_type_disk(dev, sd);
511 break;
512 default:
513 ret = pscsi_create_type_nondisk(dev, sd);
514 break;
515 }
516
517 if (ret) {
518 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
519 scsi_host_put(sh);
520 else if (legacy_mode_enable) {
521 pscsi_pmode_enable_hba(hba, 0);
522 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
523 }
524 pdv->pdv_sd = NULL;
525 return ret;
526 }
527 return 0;
528 }
529 spin_unlock_irq(sh->host_lock);
530
531 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
532 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
533
534 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
535 scsi_host_put(sh);
536 else if (legacy_mode_enable) {
537 pscsi_pmode_enable_hba(hba, 0);
538 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
539 }
540
541 return -ENODEV;
542}
543
544static void pscsi_dev_call_rcu(struct rcu_head *p)
545{
546 struct se_device *dev = container_of(p, struct se_device, rcu_head);
547 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
548
549 kfree(pdv);
550}
551
552static void pscsi_free_device(struct se_device *dev)
553{
554 call_rcu(&dev->rcu_head, pscsi_dev_call_rcu);
555}
556
557static void pscsi_destroy_device(struct se_device *dev)
558{
559 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
560 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
561 struct scsi_device *sd = pdv->pdv_sd;
562
563 if (sd) {
564
565
566
567
568
569 if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) &&
570 pdv->pdv_bd) {
571 blkdev_put(pdv->pdv_bd,
572 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
573 pdv->pdv_bd = NULL;
574 }
575
576
577
578
579 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
580 (phv->phv_lld_host != NULL))
581 scsi_host_put(phv->phv_lld_host);
582 else if (pdv->pdv_lld_host)
583 scsi_host_put(pdv->pdv_lld_host);
584
585 scsi_device_put(sd);
586
587 pdv->pdv_sd = NULL;
588 }
589}
590
591static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
592 unsigned char *req_sense)
593{
594 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
595 struct scsi_device *sd = pdv->pdv_sd;
596 struct pscsi_plugin_task *pt = cmd->priv;
597 unsigned char *cdb;
598
599
600
601
602 if (!pt)
603 return;
604
605 cdb = &pt->pscsi_cdb[0];
606
607
608
609
610 if (!cmd->data_length)
611 goto after_mode_sense;
612
613 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
614 scsi_status == SAM_STAT_GOOD) {
615 bool read_only = target_lun_is_rdonly(cmd);
616
617 if (read_only) {
618 unsigned char *buf;
619
620 buf = transport_kmap_data_sg(cmd);
621 if (!buf) {
622 ;
623 }
624
625 if (cdb[0] == MODE_SENSE_10) {
626 if (!(buf[3] & 0x80))
627 buf[3] |= 0x80;
628 } else {
629 if (!(buf[2] & 0x80))
630 buf[2] |= 0x80;
631 }
632
633 transport_kunmap_data_sg(cmd);
634 }
635 }
636after_mode_sense:
637
638 if (sd->type != TYPE_TAPE || !cmd->data_length)
639 goto after_mode_select;
640
641
642
643
644
645
646
647
648
649 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
650 scsi_status == SAM_STAT_GOOD) {
651 unsigned char *buf;
652 u16 bdl;
653 u32 blocksize;
654
655 buf = sg_virt(&cmd->t_data_sg[0]);
656 if (!buf) {
657 pr_err("Unable to get buf for scatterlist\n");
658 goto after_mode_select;
659 }
660
661 if (cdb[0] == MODE_SELECT)
662 bdl = buf[3];
663 else
664 bdl = get_unaligned_be16(&buf[6]);
665
666 if (!bdl)
667 goto after_mode_select;
668
669 if (cdb[0] == MODE_SELECT)
670 blocksize = get_unaligned_be24(&buf[9]);
671 else
672 blocksize = get_unaligned_be24(&buf[13]);
673
674 sd->sector_size = blocksize;
675 }
676after_mode_select:
677
678 if (scsi_status == SAM_STAT_CHECK_CONDITION) {
679 transport_copy_sense_to_cmd(cmd, req_sense);
680
681
682
683
684
685
686
687 if (sd->type == TYPE_TAPE &&
688 cmd->data_direction == DMA_FROM_DEVICE) {
689
690
691
692
693 if (req_sense[0] == 0xf0 &&
694 req_sense[2] & 0xe0 &&
695 (req_sense[2] & 0xf) == 0) {
696 pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n");
697 cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL;
698 }
699 }
700 }
701}
702
703enum {
704 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
705 Opt_scsi_lun_id, Opt_err
706};
707
708static match_table_t tokens = {
709 {Opt_scsi_host_id, "scsi_host_id=%d"},
710 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
711 {Opt_scsi_target_id, "scsi_target_id=%d"},
712 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
713 {Opt_err, NULL}
714};
715
716static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
717 const char *page, ssize_t count)
718{
719 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
720 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
721 char *orig, *ptr, *opts;
722 substring_t args[MAX_OPT_ARGS];
723 int ret = 0, arg, token;
724
725 opts = kstrdup(page, GFP_KERNEL);
726 if (!opts)
727 return -ENOMEM;
728
729 orig = opts;
730
731 while ((ptr = strsep(&opts, ",\n")) != NULL) {
732 if (!*ptr)
733 continue;
734
735 token = match_token(ptr, tokens, args);
736 switch (token) {
737 case Opt_scsi_host_id:
738 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
739 pr_err("PSCSI[%d]: Unable to accept"
740 " scsi_host_id while phv_mode =="
741 " PHV_LLD_SCSI_HOST_NO\n",
742 phv->phv_host_id);
743 ret = -EINVAL;
744 goto out;
745 }
746 ret = match_int(args, &arg);
747 if (ret)
748 goto out;
749 pdv->pdv_host_id = arg;
750 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
751 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
752 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
753 break;
754 case Opt_scsi_channel_id:
755 ret = match_int(args, &arg);
756 if (ret)
757 goto out;
758 pdv->pdv_channel_id = arg;
759 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
760 " ID: %d\n", phv->phv_host_id,
761 pdv->pdv_channel_id);
762 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
763 break;
764 case Opt_scsi_target_id:
765 ret = match_int(args, &arg);
766 if (ret)
767 goto out;
768 pdv->pdv_target_id = arg;
769 pr_debug("PSCSI[%d]: Referencing SCSI Target"
770 " ID: %d\n", phv->phv_host_id,
771 pdv->pdv_target_id);
772 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
773 break;
774 case Opt_scsi_lun_id:
775 ret = match_int(args, &arg);
776 if (ret)
777 goto out;
778 pdv->pdv_lun_id = arg;
779 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
780 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
781 pdv->pdv_flags |= PDF_HAS_LUN_ID;
782 break;
783 default:
784 break;
785 }
786 }
787
788out:
789 kfree(orig);
790 return (!ret) ? count : ret;
791}
792
793static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
794{
795 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
796 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
797 struct scsi_device *sd = pdv->pdv_sd;
798 unsigned char host_id[16];
799 ssize_t bl;
800
801 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
802 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
803 else
804 snprintf(host_id, 16, "PHBA Mode");
805
806 bl = sprintf(b, "SCSI Device Bus Location:"
807 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
808 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
809 host_id);
810
811 if (sd) {
812 bl += sprintf(b + bl, " Vendor: %."
813 __stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor);
814 bl += sprintf(b + bl, " Model: %."
815 __stringify(INQUIRY_MODEL_LEN) "s", sd->model);
816 bl += sprintf(b + bl, " Rev: %."
817 __stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev);
818 }
819 return bl;
820}
821
822static void pscsi_bi_endio(struct bio *bio)
823{
824 bio_put(bio);
825}
826
827static inline struct bio *pscsi_get_bio(int nr_vecs)
828{
829 struct bio *bio;
830
831
832
833
834 bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
835 if (!bio) {
836 pr_err("PSCSI: bio_kmalloc() failed\n");
837 return NULL;
838 }
839 bio->bi_end_io = pscsi_bi_endio;
840
841 return bio;
842}
843
844static sense_reason_t
845pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
846 struct request *req)
847{
848 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
849 struct bio *bio = NULL;
850 struct page *page;
851 struct scatterlist *sg;
852 u32 data_len = cmd->data_length, i, len, bytes, off;
853 int nr_pages = (cmd->data_length + sgl[0].offset +
854 PAGE_SIZE - 1) >> PAGE_SHIFT;
855 int nr_vecs = 0, rc;
856 int rw = (cmd->data_direction == DMA_TO_DEVICE);
857
858 BUG_ON(!cmd->data_length);
859
860 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
861
862 for_each_sg(sgl, sg, sgl_nents, i) {
863 page = sg_page(sg);
864 off = sg->offset;
865 len = sg->length;
866
867 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
868 page, len, off);
869
870
871
872
873
874 if (off + len > PAGE_SIZE)
875 goto fail;
876
877 if (len > 0 && data_len > 0) {
878 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
879 bytes = min(bytes, data_len);
880
881 if (!bio) {
882new_bio:
883 nr_vecs = bio_max_segs(nr_pages);
884
885
886
887 bio = pscsi_get_bio(nr_vecs);
888 if (!bio)
889 goto fail;
890
891 if (rw)
892 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
893
894 pr_debug("PSCSI: Allocated bio: %p,"
895 " dir: %s nr_vecs: %d\n", bio,
896 (rw) ? "rw" : "r", nr_vecs);
897 }
898
899 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
900 " bio: %p page: %p len: %d off: %d\n", i, bio,
901 page, len, off);
902
903 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
904 bio, page, bytes, off);
905 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
906 bio_segments(bio), nr_vecs);
907 if (rc != bytes) {
908 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
909 " %d i: %d bio: %p, allocating another"
910 " bio\n", bio->bi_vcnt, i, bio);
911
912 rc = blk_rq_append_bio(req, bio);
913 if (rc) {
914 pr_err("pSCSI: failed to append bio\n");
915 goto fail;
916 }
917
918
919
920
921
922 bio = NULL;
923 goto new_bio;
924 }
925
926 data_len -= bytes;
927 }
928 }
929
930 if (bio) {
931 rc = blk_rq_append_bio(req, bio);
932 if (rc) {
933 pr_err("pSCSI: failed to append bio\n");
934 goto fail;
935 }
936 }
937
938 return 0;
939fail:
940 if (bio)
941 bio_put(bio);
942 while (req->bio) {
943 bio = req->bio;
944 req->bio = bio->bi_next;
945 bio_put(bio);
946 }
947 req->biotail = NULL;
948 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
949}
950
951static sense_reason_t
952pscsi_parse_cdb(struct se_cmd *cmd)
953{
954 if (cmd->se_cmd_flags & SCF_BIDI)
955 return TCM_UNSUPPORTED_SCSI_OPCODE;
956
957 return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
958}
959
960static sense_reason_t
961pscsi_execute_cmd(struct se_cmd *cmd)
962{
963 struct scatterlist *sgl = cmd->t_data_sg;
964 u32 sgl_nents = cmd->t_data_nents;
965 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
966 struct pscsi_plugin_task *pt;
967 struct request *req;
968 sense_reason_t ret;
969
970
971
972
973
974 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
975 if (!pt) {
976 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
977 }
978 cmd->priv = pt;
979
980 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
981 scsi_command_size(cmd->t_task_cdb));
982
983 req = blk_get_request(pdv->pdv_sd->request_queue,
984 cmd->data_direction == DMA_TO_DEVICE ?
985 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
986 if (IS_ERR(req)) {
987 pr_err("PSCSI: blk_get_request() failed\n");
988 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
989 goto fail;
990 }
991
992 if (sgl) {
993 ret = pscsi_map_sg(cmd, sgl, sgl_nents, req);
994 if (ret)
995 goto fail_put_request;
996 }
997
998 req->end_io = pscsi_req_done;
999 req->end_io_data = cmd;
1000 scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb);
1001 scsi_req(req)->cmd = &pt->pscsi_cdb[0];
1002 if (pdv->pdv_sd->type == TYPE_DISK ||
1003 pdv->pdv_sd->type == TYPE_ZBC)
1004 req->timeout = PS_TIMEOUT_DISK;
1005 else
1006 req->timeout = PS_TIMEOUT_OTHER;
1007 scsi_req(req)->retries = PS_RETRY;
1008
1009 blk_execute_rq_nowait(NULL, req, (cmd->sam_task_attr == TCM_HEAD_TAG),
1010 pscsi_req_done);
1011
1012 return 0;
1013
1014fail_put_request:
1015 blk_put_request(req);
1016fail:
1017 kfree(pt);
1018 return ret;
1019}
1020
1021
1022
1023
1024
1025static u32 pscsi_get_device_type(struct se_device *dev)
1026{
1027 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1028 struct scsi_device *sd = pdv->pdv_sd;
1029
1030 return (sd) ? sd->type : TYPE_NO_LUN;
1031}
1032
1033static sector_t pscsi_get_blocks(struct se_device *dev)
1034{
1035 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1036
1037 if (pdv->pdv_bd)
1038 return bdev_nr_sectors(pdv->pdv_bd);
1039 return 0;
1040}
1041
1042static void pscsi_req_done(struct request *req, blk_status_t status)
1043{
1044 struct se_cmd *cmd = req->end_io_data;
1045 struct pscsi_plugin_task *pt = cmd->priv;
1046 int result = scsi_req(req)->result;
1047 enum sam_status scsi_status = result & 0xff;
1048
1049 if (scsi_status != SAM_STAT_GOOD) {
1050 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1051 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1052 result);
1053 }
1054
1055 pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense);
1056
1057 switch (host_byte(result)) {
1058 case DID_OK:
1059 target_complete_cmd_with_length(cmd, scsi_status,
1060 cmd->data_length - scsi_req(req)->resid_len);
1061 break;
1062 default:
1063 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1064 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1065 result);
1066 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1067 break;
1068 }
1069
1070 blk_put_request(req);
1071 kfree(pt);
1072}
1073
1074static const struct target_backend_ops pscsi_ops = {
1075 .name = "pscsi",
1076 .owner = THIS_MODULE,
1077 .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH |
1078 TRANSPORT_FLAG_PASSTHROUGH_ALUA |
1079 TRANSPORT_FLAG_PASSTHROUGH_PGR,
1080 .attach_hba = pscsi_attach_hba,
1081 .detach_hba = pscsi_detach_hba,
1082 .pmode_enable_hba = pscsi_pmode_enable_hba,
1083 .alloc_device = pscsi_alloc_device,
1084 .configure_device = pscsi_configure_device,
1085 .destroy_device = pscsi_destroy_device,
1086 .free_device = pscsi_free_device,
1087 .parse_cdb = pscsi_parse_cdb,
1088 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1089 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1090 .get_device_type = pscsi_get_device_type,
1091 .get_blocks = pscsi_get_blocks,
1092 .tb_dev_attrib_attrs = passthrough_attrib_attrs,
1093};
1094
1095static int __init pscsi_module_init(void)
1096{
1097 return transport_backend_register(&pscsi_ops);
1098}
1099
1100static void __exit pscsi_module_exit(void)
1101{
1102 target_backend_unregister(&pscsi_ops);
1103}
1104
1105MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1106MODULE_AUTHOR("nab@Linux-iSCSI.org");
1107MODULE_LICENSE("GPL");
1108
1109module_init(pscsi_module_init);
1110module_exit(pscsi_module_exit);
1111
