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26#include <linux/string.h>
27#include <linux/parser.h>
28#include <linux/timer.h>
29#include <linux/blkdev.h>
30#include <linux/blk_types.h>
31#include <linux/slab.h>
32#include <linux/spinlock.h>
33#include <linux/genhd.h>
34#include <linux/cdrom.h>
35#include <linux/ratelimit.h>
36#include <linux/module.h>
37#include <asm/unaligned.h>
38
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_backend.h>
47
48#include "target_core_alua.h"
49#include "target_core_pscsi.h"
50
51#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
52
53static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
54{
55 return container_of(dev, struct pscsi_dev_virt, dev);
56}
57
58static struct se_subsystem_api pscsi_template;
59
60static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
61static void pscsi_req_done(struct request *, int);
62
63
64
65
66
67
68static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
69{
70 struct pscsi_hba_virt *phv;
71
72 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
73 if (!phv) {
74 pr_err("Unable to allocate struct pscsi_hba_virt\n");
75 return -ENOMEM;
76 }
77 phv->phv_host_id = host_id;
78 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
79
80 hba->hba_ptr = phv;
81
82 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
83 " Generic Target Core Stack %s\n", hba->hba_id,
84 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
85 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
86 hba->hba_id);
87
88 return 0;
89}
90
91static void pscsi_detach_hba(struct se_hba *hba)
92{
93 struct pscsi_hba_virt *phv = hba->hba_ptr;
94 struct Scsi_Host *scsi_host = phv->phv_lld_host;
95
96 if (scsi_host) {
97 scsi_host_put(scsi_host);
98
99 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
100 " Generic Target Core\n", hba->hba_id,
101 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
102 "Unknown");
103 } else
104 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
105 " from Generic Target Core\n", hba->hba_id);
106
107 kfree(phv);
108 hba->hba_ptr = NULL;
109}
110
111static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
112{
113 struct pscsi_hba_virt *phv = hba->hba_ptr;
114 struct Scsi_Host *sh = phv->phv_lld_host;
115
116
117
118 if (!mode_flag) {
119 if (!sh)
120 return 0;
121
122 phv->phv_lld_host = NULL;
123 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
124
125 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
126 " %s\n", hba->hba_id, (sh->hostt->name) ?
127 (sh->hostt->name) : "Unknown");
128
129 scsi_host_put(sh);
130 return 0;
131 }
132
133
134
135
136 sh = scsi_host_lookup(phv->phv_host_id);
137 if (IS_ERR(sh)) {
138 pr_err("pSCSI: Unable to locate SCSI Host for"
139 " phv_host_id: %d\n", phv->phv_host_id);
140 return PTR_ERR(sh);
141 }
142
143 phv->phv_lld_host = sh;
144 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
145
146 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
147 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
148
149 return 1;
150}
151
152static void pscsi_tape_read_blocksize(struct se_device *dev,
153 struct scsi_device *sdev)
154{
155 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
156 int ret;
157
158 buf = kzalloc(12, GFP_KERNEL);
159 if (!buf)
160 return;
161
162 memset(cdb, 0, MAX_COMMAND_SIZE);
163 cdb[0] = MODE_SENSE;
164 cdb[4] = 0x0c;
165
166 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
167 HZ, 1, NULL);
168 if (ret)
169 goto out_free;
170
171
172
173
174 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
175 if (!sdev->sector_size)
176 sdev->sector_size = 1024;
177out_free:
178 kfree(buf);
179}
180
181static void
182pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
183{
184 unsigned char *buf;
185
186 if (sdev->inquiry_len < INQUIRY_LEN)
187 return;
188
189 buf = sdev->inquiry;
190 if (!buf)
191 return;
192
193
194
195 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
196 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
197 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
198}
199
200static int
201pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
202{
203 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
204 int ret;
205
206 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
207 if (!buf)
208 return -ENOMEM;
209
210 memset(cdb, 0, MAX_COMMAND_SIZE);
211 cdb[0] = INQUIRY;
212 cdb[1] = 0x01;
213 cdb[2] = 0x80;
214 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
215 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
216
217 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
218 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
219 if (ret)
220 goto out_free;
221
222 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
223
224 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
225
226 kfree(buf);
227 return 0;
228
229out_free:
230 kfree(buf);
231 return -EPERM;
232}
233
234static void
235pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
236 struct t10_wwn *wwn)
237{
238 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
239 int ident_len, page_len, off = 4, ret;
240 struct t10_vpd *vpd;
241
242 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
243 if (!buf)
244 return;
245
246 memset(cdb, 0, MAX_COMMAND_SIZE);
247 cdb[0] = INQUIRY;
248 cdb[1] = 0x01;
249 cdb[2] = 0x83;
250 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
251 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
252
253 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
254 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
255 NULL, HZ, 1, NULL);
256 if (ret)
257 goto out;
258
259 page_len = (buf[2] << 8) | buf[3];
260 while (page_len > 0) {
261
262 page_83 = &buf[off];
263 ident_len = page_83[3];
264 if (!ident_len) {
265 pr_err("page_83[3]: identifier"
266 " length zero!\n");
267 break;
268 }
269 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
270
271 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
272 if (!vpd) {
273 pr_err("Unable to allocate memory for"
274 " struct t10_vpd\n");
275 goto out;
276 }
277 INIT_LIST_HEAD(&vpd->vpd_list);
278
279 transport_set_vpd_proto_id(vpd, page_83);
280 transport_set_vpd_assoc(vpd, page_83);
281
282 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
283 off += (ident_len + 4);
284 page_len -= (ident_len + 4);
285 kfree(vpd);
286 continue;
287 }
288 if (transport_set_vpd_ident(vpd, page_83) < 0) {
289 off += (ident_len + 4);
290 page_len -= (ident_len + 4);
291 kfree(vpd);
292 continue;
293 }
294
295 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
296 off += (ident_len + 4);
297 page_len -= (ident_len + 4);
298 }
299
300out:
301 kfree(buf);
302}
303
304static int pscsi_add_device_to_list(struct se_device *dev,
305 struct scsi_device *sd)
306{
307 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
308 struct request_queue *q = sd->request_queue;
309
310 pdv->pdv_sd = sd;
311
312 if (!sd->queue_depth) {
313 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
314
315 pr_err("Set broken SCSI Device %d:%d:%d"
316 " queue_depth to %d\n", sd->channel, sd->id,
317 sd->lun, sd->queue_depth);
318 }
319
320 dev->dev_attrib.hw_block_size = sd->sector_size;
321 dev->dev_attrib.hw_max_sectors =
322 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
323 dev->dev_attrib.hw_queue_depth = sd->queue_depth;
324
325
326
327
328 pscsi_set_inquiry_info(sd, &dev->t10_wwn);
329
330
331
332
333
334 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
335
336
337
338
339 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
340 }
341
342
343
344
345 if (sd->type == TYPE_TAPE)
346 pscsi_tape_read_blocksize(dev, sd);
347 return 0;
348}
349
350static struct se_device *pscsi_alloc_device(struct se_hba *hba,
351 const char *name)
352{
353 struct pscsi_dev_virt *pdv;
354
355 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
356 if (!pdv) {
357 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
358 return NULL;
359 }
360
361 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
362 return &pdv->dev;
363}
364
365
366
367
368static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
369 __releases(sh->host_lock)
370{
371 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
372 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
373 struct Scsi_Host *sh = sd->host;
374 struct block_device *bd;
375 int ret;
376
377 if (scsi_device_get(sd)) {
378 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
379 sh->host_no, sd->channel, sd->id, sd->lun);
380 spin_unlock_irq(sh->host_lock);
381 return -EIO;
382 }
383 spin_unlock_irq(sh->host_lock);
384
385
386
387
388 bd = blkdev_get_by_path(dev->udev_path,
389 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
390 if (IS_ERR(bd)) {
391 pr_err("pSCSI: blkdev_get_by_path() failed\n");
392 scsi_device_put(sd);
393 return PTR_ERR(bd);
394 }
395 pdv->pdv_bd = bd;
396
397 ret = pscsi_add_device_to_list(dev, sd);
398 if (ret) {
399 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
400 scsi_device_put(sd);
401 return ret;
402 }
403
404 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
405 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
406 return 0;
407}
408
409
410
411
412static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
413 __releases(sh->host_lock)
414{
415 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
416 struct Scsi_Host *sh = sd->host;
417 int ret;
418
419 if (scsi_device_get(sd)) {
420 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
421 sh->host_no, sd->channel, sd->id, sd->lun);
422 spin_unlock_irq(sh->host_lock);
423 return -EIO;
424 }
425 spin_unlock_irq(sh->host_lock);
426
427 ret = pscsi_add_device_to_list(dev, sd);
428 if (ret) {
429 scsi_device_put(sd);
430 return ret;
431 }
432 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
433 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
434 sd->channel, sd->id, sd->lun);
435
436 return 0;
437}
438
439
440
441
442static int pscsi_create_type_other(struct se_device *dev,
443 struct scsi_device *sd)
444 __releases(sh->host_lock)
445{
446 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
447 struct Scsi_Host *sh = sd->host;
448 int ret;
449
450 spin_unlock_irq(sh->host_lock);
451 ret = pscsi_add_device_to_list(dev, sd);
452 if (ret)
453 return ret;
454
455 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
456 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
457 sd->channel, sd->id, sd->lun);
458 return 0;
459}
460
461static int pscsi_configure_device(struct se_device *dev)
462{
463 struct se_hba *hba = dev->se_hba;
464 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
465 struct scsi_device *sd;
466 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
467 struct Scsi_Host *sh = phv->phv_lld_host;
468 int legacy_mode_enable = 0;
469 int ret;
470
471 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
472 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
473 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
474 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
475 " scsi_lun_id= parameters\n");
476 return -EINVAL;
477 }
478
479
480
481
482
483 if (!sh) {
484 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
485 pr_err("pSCSI: Unable to locate struct"
486 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
487 return -ENODEV;
488 }
489
490
491
492
493 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
494 pr_err("pSCSI: udev_path attribute has not"
495 " been set before ENABLE=1\n");
496 return -EINVAL;
497 }
498
499
500
501
502
503 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
504 if (hba->dev_count) {
505 pr_err("pSCSI: Unable to set hba_mode"
506 " with active devices\n");
507 return -EEXIST;
508 }
509
510 if (pscsi_pmode_enable_hba(hba, 1) != 1)
511 return -ENODEV;
512
513 legacy_mode_enable = 1;
514 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
515 sh = phv->phv_lld_host;
516 } else {
517 sh = scsi_host_lookup(pdv->pdv_host_id);
518 if (IS_ERR(sh)) {
519 pr_err("pSCSI: Unable to locate"
520 " pdv_host_id: %d\n", pdv->pdv_host_id);
521 return PTR_ERR(sh);
522 }
523 }
524 } else {
525 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
526 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
527 " struct Scsi_Host exists\n");
528 return -EEXIST;
529 }
530 }
531
532 spin_lock_irq(sh->host_lock);
533 list_for_each_entry(sd, &sh->__devices, siblings) {
534 if ((pdv->pdv_channel_id != sd->channel) ||
535 (pdv->pdv_target_id != sd->id) ||
536 (pdv->pdv_lun_id != sd->lun))
537 continue;
538
539
540
541
542
543 switch (sd->type) {
544 case TYPE_DISK:
545 ret = pscsi_create_type_disk(dev, sd);
546 break;
547 case TYPE_ROM:
548 ret = pscsi_create_type_rom(dev, sd);
549 break;
550 default:
551 ret = pscsi_create_type_other(dev, sd);
552 break;
553 }
554
555 if (ret) {
556 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
557 scsi_host_put(sh);
558 else if (legacy_mode_enable) {
559 pscsi_pmode_enable_hba(hba, 0);
560 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
561 }
562 pdv->pdv_sd = NULL;
563 return ret;
564 }
565 return 0;
566 }
567 spin_unlock_irq(sh->host_lock);
568
569 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
570 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
571
572 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
573 scsi_host_put(sh);
574 else if (legacy_mode_enable) {
575 pscsi_pmode_enable_hba(hba, 0);
576 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
577 }
578
579 return -ENODEV;
580}
581
582static void pscsi_free_device(struct se_device *dev)
583{
584 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
585 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
586 struct scsi_device *sd = pdv->pdv_sd;
587
588 if (sd) {
589
590
591
592
593 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
594 blkdev_put(pdv->pdv_bd,
595 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
596 pdv->pdv_bd = NULL;
597 }
598
599
600
601
602 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
603 (phv->phv_lld_host != NULL))
604 scsi_host_put(phv->phv_lld_host);
605
606 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
607 scsi_device_put(sd);
608
609 pdv->pdv_sd = NULL;
610 }
611
612 kfree(pdv);
613}
614
615static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
616 unsigned char *sense_buffer)
617{
618 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
619 struct scsi_device *sd = pdv->pdv_sd;
620 int result;
621 struct pscsi_plugin_task *pt = cmd->priv;
622 unsigned char *cdb;
623
624
625
626
627 if (!pt)
628 return;
629
630 cdb = &pt->pscsi_cdb[0];
631 result = pt->pscsi_result;
632
633
634
635
636 if (!cmd->se_deve || !cmd->data_length)
637 goto after_mode_sense;
638
639 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
640 (status_byte(result) << 1) == SAM_STAT_GOOD) {
641 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
642 unsigned char *buf;
643
644 buf = transport_kmap_data_sg(cmd);
645 if (!buf)
646 ;
647
648 if (cdb[0] == MODE_SENSE_10) {
649 if (!(buf[3] & 0x80))
650 buf[3] |= 0x80;
651 } else {
652 if (!(buf[2] & 0x80))
653 buf[2] |= 0x80;
654 }
655
656 transport_kunmap_data_sg(cmd);
657 }
658 }
659after_mode_sense:
660
661 if (sd->type != TYPE_TAPE || !cmd->data_length)
662 goto after_mode_select;
663
664
665
666
667
668
669
670
671
672 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
673 (status_byte(result) << 1) == SAM_STAT_GOOD) {
674 unsigned char *buf;
675 u16 bdl;
676 u32 blocksize;
677
678 buf = sg_virt(&sg[0]);
679 if (!buf) {
680 pr_err("Unable to get buf for scatterlist\n");
681 goto after_mode_select;
682 }
683
684 if (cdb[0] == MODE_SELECT)
685 bdl = (buf[3]);
686 else
687 bdl = (buf[6] << 8) | (buf[7]);
688
689 if (!bdl)
690 goto after_mode_select;
691
692 if (cdb[0] == MODE_SELECT)
693 blocksize = (buf[9] << 16) | (buf[10] << 8) |
694 (buf[11]);
695 else
696 blocksize = (buf[13] << 16) | (buf[14] << 8) |
697 (buf[15]);
698
699 sd->sector_size = blocksize;
700 }
701after_mode_select:
702
703 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
704 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
705 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
706 }
707}
708
709enum {
710 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
711 Opt_scsi_lun_id, Opt_err
712};
713
714static match_table_t tokens = {
715 {Opt_scsi_host_id, "scsi_host_id=%d"},
716 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
717 {Opt_scsi_target_id, "scsi_target_id=%d"},
718 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
719 {Opt_err, NULL}
720};
721
722static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
723 const char *page, ssize_t count)
724{
725 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
726 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
727 char *orig, *ptr, *opts;
728 substring_t args[MAX_OPT_ARGS];
729 int ret = 0, arg, token;
730
731 opts = kstrdup(page, GFP_KERNEL);
732 if (!opts)
733 return -ENOMEM;
734
735 orig = opts;
736
737 while ((ptr = strsep(&opts, ",\n")) != NULL) {
738 if (!*ptr)
739 continue;
740
741 token = match_token(ptr, tokens, args);
742 switch (token) {
743 case Opt_scsi_host_id:
744 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
745 pr_err("PSCSI[%d]: Unable to accept"
746 " scsi_host_id while phv_mode =="
747 " PHV_LLD_SCSI_HOST_NO\n",
748 phv->phv_host_id);
749 ret = -EINVAL;
750 goto out;
751 }
752 match_int(args, &arg);
753 pdv->pdv_host_id = arg;
754 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
755 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
756 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
757 break;
758 case Opt_scsi_channel_id:
759 match_int(args, &arg);
760 pdv->pdv_channel_id = arg;
761 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
762 " ID: %d\n", phv->phv_host_id,
763 pdv->pdv_channel_id);
764 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
765 break;
766 case Opt_scsi_target_id:
767 match_int(args, &arg);
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 match_int(args, &arg);
776 pdv->pdv_lun_id = arg;
777 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
778 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
779 pdv->pdv_flags |= PDF_HAS_LUN_ID;
780 break;
781 default:
782 break;
783 }
784 }
785
786out:
787 kfree(orig);
788 return (!ret) ? count : ret;
789}
790
791static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
792{
793 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
794 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
795 struct scsi_device *sd = pdv->pdv_sd;
796 unsigned char host_id[16];
797 ssize_t bl;
798 int i;
799
800 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
801 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
802 else
803 snprintf(host_id, 16, "PHBA Mode");
804
805 bl = sprintf(b, "SCSI Device Bus Location:"
806 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
807 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
808 host_id);
809
810 if (sd) {
811 bl += sprintf(b + bl, " ");
812 bl += sprintf(b + bl, "Vendor: ");
813 for (i = 0; i < 8; i++) {
814 if (ISPRINT(sd->vendor[i]))
815 bl += sprintf(b + bl, "%c", sd->vendor[i]);
816 else
817 bl += sprintf(b + bl, " ");
818 }
819 bl += sprintf(b + bl, " Model: ");
820 for (i = 0; i < 16; i++) {
821 if (ISPRINT(sd->model[i]))
822 bl += sprintf(b + bl, "%c", sd->model[i]);
823 else
824 bl += sprintf(b + bl, " ");
825 }
826 bl += sprintf(b + bl, " Rev: ");
827 for (i = 0; i < 4; i++) {
828 if (ISPRINT(sd->rev[i]))
829 bl += sprintf(b + bl, "%c", sd->rev[i]);
830 else
831 bl += sprintf(b + bl, " ");
832 }
833 bl += sprintf(b + bl, "\n");
834 }
835 return bl;
836}
837
838static void pscsi_bi_endio(struct bio *bio, int error)
839{
840 bio_put(bio);
841}
842
843static inline struct bio *pscsi_get_bio(int nr_vecs)
844{
845 struct bio *bio;
846
847
848
849
850 bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
851 if (!bio) {
852 pr_err("PSCSI: bio_kmalloc() failed\n");
853 return NULL;
854 }
855 bio->bi_end_io = pscsi_bi_endio;
856
857 return bio;
858}
859
860static sense_reason_t
861pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
862 enum dma_data_direction data_direction, struct bio **hbio)
863{
864 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
865 struct bio *bio = NULL, *tbio = NULL;
866 struct page *page;
867 struct scatterlist *sg;
868 u32 data_len = cmd->data_length, i, len, bytes, off;
869 int nr_pages = (cmd->data_length + sgl[0].offset +
870 PAGE_SIZE - 1) >> PAGE_SHIFT;
871 int nr_vecs = 0, rc;
872 int rw = (data_direction == DMA_TO_DEVICE);
873
874 *hbio = NULL;
875
876 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
877
878 for_each_sg(sgl, sg, sgl_nents, i) {
879 page = sg_page(sg);
880 off = sg->offset;
881 len = sg->length;
882
883 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
884 page, len, off);
885
886
887
888
889
890 if (off + len > PAGE_SIZE)
891 goto fail;
892
893 if (len > 0 && data_len > 0) {
894 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
895 bytes = min(bytes, data_len);
896
897 if (!bio) {
898 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
899 nr_pages -= nr_vecs;
900
901
902
903 bio = pscsi_get_bio(nr_vecs);
904 if (!bio)
905 goto fail;
906
907 if (rw)
908 bio->bi_rw |= REQ_WRITE;
909
910 pr_debug("PSCSI: Allocated bio: %p,"
911 " dir: %s nr_vecs: %d\n", bio,
912 (rw) ? "rw" : "r", nr_vecs);
913
914
915
916
917
918
919 if (!*hbio)
920 *hbio = tbio = bio;
921 else
922 tbio = tbio->bi_next = bio;
923 }
924
925 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
926 " bio: %p page: %p len: %d off: %d\n", i, bio,
927 page, len, off);
928
929 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
930 bio, page, bytes, off);
931 if (rc != bytes)
932 goto fail;
933
934 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
935 bio->bi_vcnt, nr_vecs);
936
937 if (bio->bi_vcnt > nr_vecs) {
938 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
939 " %d i: %d bio: %p, allocating another"
940 " bio\n", bio->bi_vcnt, i, bio);
941
942
943
944
945
946
947 bio = NULL;
948 }
949
950 data_len -= bytes;
951 }
952 }
953
954 return 0;
955fail:
956 while (*hbio) {
957 bio = *hbio;
958 *hbio = (*hbio)->bi_next;
959 bio_endio(bio, 0);
960 }
961 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
962}
963
964
965
966
967
968
969static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
970{
971 switch (cdb[0]) {
972 case READ_10:
973 case READ_12:
974 case READ_16:
975 case SEND_DIAGNOSTIC:
976 case VERIFY:
977 case VERIFY_16:
978 case WRITE_VERIFY:
979 case WRITE_VERIFY_12:
980 case MAINTENANCE_IN:
981 break;
982 default:
983 cdb[1] &= 0x1f;
984 break;
985 }
986}
987
988static sense_reason_t
989pscsi_parse_cdb(struct se_cmd *cmd)
990{
991 unsigned char *cdb = cmd->t_task_cdb;
992
993 if (cmd->se_cmd_flags & SCF_BIDI)
994 return TCM_UNSUPPORTED_SCSI_OPCODE;
995
996 pscsi_clear_cdb_lun(cdb);
997
998
999
1000
1001
1002
1003 switch (cdb[0]) {
1004 case REPORT_LUNS:
1005 cmd->execute_cmd = spc_emulate_report_luns;
1006 return 0;
1007 case READ_6:
1008 case READ_10:
1009 case READ_12:
1010 case READ_16:
1011 case WRITE_6:
1012 case WRITE_10:
1013 case WRITE_12:
1014 case WRITE_16:
1015 case WRITE_VERIFY:
1016 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1017
1018 default:
1019 cmd->execute_cmd = pscsi_execute_cmd;
1020 return 0;
1021 }
1022}
1023
1024static sense_reason_t
1025pscsi_execute_cmd(struct se_cmd *cmd)
1026{
1027 struct scatterlist *sgl = cmd->t_data_sg;
1028 u32 sgl_nents = cmd->t_data_nents;
1029 enum dma_data_direction data_direction = cmd->data_direction;
1030 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
1031 struct pscsi_plugin_task *pt;
1032 struct request *req;
1033 struct bio *hbio;
1034 sense_reason_t ret;
1035
1036
1037
1038
1039
1040 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1041 if (!pt) {
1042 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1043 }
1044 cmd->priv = pt;
1045
1046 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1047 scsi_command_size(cmd->t_task_cdb));
1048
1049 if (!sgl) {
1050 req = blk_get_request(pdv->pdv_sd->request_queue,
1051 (data_direction == DMA_TO_DEVICE),
1052 GFP_KERNEL);
1053 if (!req || IS_ERR(req)) {
1054 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1055 req ? IS_ERR(req) : -ENOMEM);
1056 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1057 goto fail;
1058 }
1059 } else {
1060 BUG_ON(!cmd->data_length);
1061
1062 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1063 if (ret)
1064 goto fail;
1065
1066 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1067 GFP_KERNEL);
1068 if (IS_ERR(req)) {
1069 pr_err("pSCSI: blk_make_request() failed\n");
1070 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1071 goto fail_free_bio;
1072 }
1073 }
1074
1075 req->cmd_type = REQ_TYPE_BLOCK_PC;
1076 req->end_io = pscsi_req_done;
1077 req->end_io_data = cmd;
1078 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1079 req->cmd = &pt->pscsi_cdb[0];
1080 req->sense = &pt->pscsi_sense[0];
1081 req->sense_len = 0;
1082 if (pdv->pdv_sd->type == TYPE_DISK)
1083 req->timeout = PS_TIMEOUT_DISK;
1084 else
1085 req->timeout = PS_TIMEOUT_OTHER;
1086 req->retries = PS_RETRY;
1087
1088 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1089 (cmd->sam_task_attr == MSG_HEAD_TAG),
1090 pscsi_req_done);
1091
1092 return 0;
1093
1094fail_free_bio:
1095 while (hbio) {
1096 struct bio *bio = hbio;
1097 hbio = hbio->bi_next;
1098 bio_endio(bio, 0);
1099 }
1100 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1101fail:
1102 kfree(pt);
1103 return ret;
1104}
1105
1106
1107
1108
1109
1110static u32 pscsi_get_device_type(struct se_device *dev)
1111{
1112 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1113 struct scsi_device *sd = pdv->pdv_sd;
1114
1115 return sd->type;
1116}
1117
1118static sector_t pscsi_get_blocks(struct se_device *dev)
1119{
1120 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1121
1122 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1123 return pdv->pdv_bd->bd_part->nr_sects;
1124
1125 dump_stack();
1126 return 0;
1127}
1128
1129static void pscsi_req_done(struct request *req, int uptodate)
1130{
1131 struct se_cmd *cmd = req->end_io_data;
1132 struct pscsi_plugin_task *pt = cmd->priv;
1133
1134 pt->pscsi_result = req->errors;
1135 pt->pscsi_resid = req->resid_len;
1136
1137 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1138 if (cmd->scsi_status) {
1139 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1140 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1141 pt->pscsi_result);
1142 }
1143
1144 switch (host_byte(pt->pscsi_result)) {
1145 case DID_OK:
1146 target_complete_cmd(cmd, cmd->scsi_status);
1147 break;
1148 default:
1149 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1150 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1151 pt->pscsi_result);
1152 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1153 break;
1154 }
1155
1156 __blk_put_request(req->q, req);
1157 kfree(pt);
1158}
1159
1160static struct se_subsystem_api pscsi_template = {
1161 .name = "pscsi",
1162 .owner = THIS_MODULE,
1163 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1164 .attach_hba = pscsi_attach_hba,
1165 .detach_hba = pscsi_detach_hba,
1166 .pmode_enable_hba = pscsi_pmode_enable_hba,
1167 .alloc_device = pscsi_alloc_device,
1168 .configure_device = pscsi_configure_device,
1169 .free_device = pscsi_free_device,
1170 .transport_complete = pscsi_transport_complete,
1171 .parse_cdb = pscsi_parse_cdb,
1172 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1173 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1174 .get_device_type = pscsi_get_device_type,
1175 .get_blocks = pscsi_get_blocks,
1176};
1177
1178static int __init pscsi_module_init(void)
1179{
1180 return transport_subsystem_register(&pscsi_template);
1181}
1182
1183static void __exit pscsi_module_exit(void)
1184{
1185 transport_subsystem_release(&pscsi_template);
1186}
1187
1188MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1189MODULE_AUTHOR("nab@Linux-iSCSI.org");
1190MODULE_LICENSE("GPL");
1191
1192module_init(pscsi_module_init);
1193module_exit(pscsi_module_exit);
1194
