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target: Use a PASSTHROUGH flag instead of transport_types
[mirror_ubuntu-artful-kernel.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 * (c) Copyright 2003-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
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 #include <target/target_core_backend_configfs.h>
48
49 #include "target_core_alua.h"
50 #include "target_core_pscsi.h"
51
52 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
53
54 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
55 {
56 return container_of(dev, struct pscsi_dev_virt, dev);
57 }
58
59 static struct se_subsystem_api pscsi_template;
60
61 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
62 static void pscsi_req_done(struct request *, int);
63
64 /* pscsi_attach_hba():
65 *
66 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
67 * from the passed SCSI Host ID.
68 */
69 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
70 {
71 struct pscsi_hba_virt *phv;
72
73 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
74 if (!phv) {
75 pr_err("Unable to allocate struct pscsi_hba_virt\n");
76 return -ENOMEM;
77 }
78 phv->phv_host_id = host_id;
79 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
80
81 hba->hba_ptr = phv;
82
83 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
84 " Generic Target Core Stack %s\n", hba->hba_id,
85 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
86 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
87 hba->hba_id);
88
89 return 0;
90 }
91
92 static void pscsi_detach_hba(struct se_hba *hba)
93 {
94 struct pscsi_hba_virt *phv = hba->hba_ptr;
95 struct Scsi_Host *scsi_host = phv->phv_lld_host;
96
97 if (scsi_host) {
98 scsi_host_put(scsi_host);
99
100 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
101 " Generic Target Core\n", hba->hba_id,
102 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
103 "Unknown");
104 } else
105 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
106 " from Generic Target Core\n", hba->hba_id);
107
108 kfree(phv);
109 hba->hba_ptr = NULL;
110 }
111
112 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
113 {
114 struct pscsi_hba_virt *phv = hba->hba_ptr;
115 struct Scsi_Host *sh = phv->phv_lld_host;
116 /*
117 * Release the struct Scsi_Host
118 */
119 if (!mode_flag) {
120 if (!sh)
121 return 0;
122
123 phv->phv_lld_host = NULL;
124 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
125
126 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
127 " %s\n", hba->hba_id, (sh->hostt->name) ?
128 (sh->hostt->name) : "Unknown");
129
130 scsi_host_put(sh);
131 return 0;
132 }
133 /*
134 * Otherwise, locate struct Scsi_Host from the original passed
135 * pSCSI Host ID and enable for phba mode
136 */
137 sh = scsi_host_lookup(phv->phv_host_id);
138 if (!sh) {
139 pr_err("pSCSI: Unable to locate SCSI Host for"
140 " phv_host_id: %d\n", phv->phv_host_id);
141 return -EINVAL;
142 }
143
144 phv->phv_lld_host = sh;
145 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
146
147 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
148 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
149
150 return 1;
151 }
152
153 static void pscsi_tape_read_blocksize(struct se_device *dev,
154 struct scsi_device *sdev)
155 {
156 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
157 int ret;
158
159 buf = kzalloc(12, GFP_KERNEL);
160 if (!buf)
161 return;
162
163 memset(cdb, 0, MAX_COMMAND_SIZE);
164 cdb[0] = MODE_SENSE;
165 cdb[4] = 0x0c; /* 12 bytes */
166
167 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
168 HZ, 1, NULL);
169 if (ret)
170 goto out_free;
171
172 /*
173 * If MODE_SENSE still returns zero, set the default value to 1024.
174 */
175 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
176 if (!sdev->sector_size)
177 sdev->sector_size = 1024;
178 out_free:
179 kfree(buf);
180 }
181
182 static void
183 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
184 {
185 unsigned char *buf;
186
187 if (sdev->inquiry_len < INQUIRY_LEN)
188 return;
189
190 buf = sdev->inquiry;
191 if (!buf)
192 return;
193 /*
194 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
195 */
196 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
197 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
198 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
199 }
200
201 static int
202 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
203 {
204 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
205 int ret;
206
207 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
208 if (!buf)
209 return -ENOMEM;
210
211 memset(cdb, 0, MAX_COMMAND_SIZE);
212 cdb[0] = INQUIRY;
213 cdb[1] = 0x01; /* Query VPD */
214 cdb[2] = 0x80; /* Unit Serial Number */
215 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
216 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
217
218 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
219 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
220 if (ret)
221 goto out_free;
222
223 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
224
225 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
226
227 kfree(buf);
228 return 0;
229
230 out_free:
231 kfree(buf);
232 return -EPERM;
233 }
234
235 static void
236 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
237 struct t10_wwn *wwn)
238 {
239 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
240 int ident_len, page_len, off = 4, ret;
241 struct t10_vpd *vpd;
242
243 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
244 if (!buf)
245 return;
246
247 memset(cdb, 0, MAX_COMMAND_SIZE);
248 cdb[0] = INQUIRY;
249 cdb[1] = 0x01; /* Query VPD */
250 cdb[2] = 0x83; /* Device Identifier */
251 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
252 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
253
254 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
255 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
256 NULL, HZ, 1, NULL);
257 if (ret)
258 goto out;
259
260 page_len = (buf[2] << 8) | buf[3];
261 while (page_len > 0) {
262 /* Grab a pointer to the Identification descriptor */
263 page_83 = &buf[off];
264 ident_len = page_83[3];
265 if (!ident_len) {
266 pr_err("page_83[3]: identifier"
267 " length zero!\n");
268 break;
269 }
270 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
271
272 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
273 if (!vpd) {
274 pr_err("Unable to allocate memory for"
275 " struct t10_vpd\n");
276 goto out;
277 }
278 INIT_LIST_HEAD(&vpd->vpd_list);
279
280 transport_set_vpd_proto_id(vpd, page_83);
281 transport_set_vpd_assoc(vpd, page_83);
282
283 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
284 off += (ident_len + 4);
285 page_len -= (ident_len + 4);
286 kfree(vpd);
287 continue;
288 }
289 if (transport_set_vpd_ident(vpd, page_83) < 0) {
290 off += (ident_len + 4);
291 page_len -= (ident_len + 4);
292 kfree(vpd);
293 continue;
294 }
295
296 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
297 off += (ident_len + 4);
298 page_len -= (ident_len + 4);
299 }
300
301 out:
302 kfree(buf);
303 }
304
305 static int pscsi_add_device_to_list(struct se_device *dev,
306 struct scsi_device *sd)
307 {
308 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
309 struct request_queue *q = sd->request_queue;
310
311 pdv->pdv_sd = sd;
312
313 if (!sd->queue_depth) {
314 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
315
316 pr_err("Set broken SCSI Device %d:%d:%llu"
317 " queue_depth to %d\n", sd->channel, sd->id,
318 sd->lun, sd->queue_depth);
319 }
320
321 dev->dev_attrib.hw_block_size = sd->sector_size;
322 dev->dev_attrib.hw_max_sectors =
323 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
324 dev->dev_attrib.hw_queue_depth = sd->queue_depth;
325
326 /*
327 * Setup our standard INQUIRY info into se_dev->t10_wwn
328 */
329 pscsi_set_inquiry_info(sd, &dev->t10_wwn);
330
331 /*
332 * Locate VPD WWN Information used for various purposes within
333 * the Storage Engine.
334 */
335 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
336 /*
337 * If VPD Unit Serial returned GOOD status, try
338 * VPD Device Identification page (0x83).
339 */
340 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
341 }
342
343 /*
344 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
345 */
346 if (sd->type == TYPE_TAPE)
347 pscsi_tape_read_blocksize(dev, sd);
348 return 0;
349 }
350
351 static struct se_device *pscsi_alloc_device(struct se_hba *hba,
352 const char *name)
353 {
354 struct pscsi_dev_virt *pdv;
355
356 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
357 if (!pdv) {
358 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
359 return NULL;
360 }
361
362 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
363 return &pdv->dev;
364 }
365
366 /*
367 * Called with struct Scsi_Host->host_lock called.
368 */
369 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
370 __releases(sh->host_lock)
371 {
372 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
373 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
374 struct Scsi_Host *sh = sd->host;
375 struct block_device *bd;
376 int ret;
377
378 if (scsi_device_get(sd)) {
379 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
380 sh->host_no, sd->channel, sd->id, sd->lun);
381 spin_unlock_irq(sh->host_lock);
382 return -EIO;
383 }
384 spin_unlock_irq(sh->host_lock);
385 /*
386 * Claim exclusive struct block_device access to struct scsi_device
387 * for TYPE_DISK using supplied udev_path
388 */
389 bd = blkdev_get_by_path(dev->udev_path,
390 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
391 if (IS_ERR(bd)) {
392 pr_err("pSCSI: blkdev_get_by_path() failed\n");
393 scsi_device_put(sd);
394 return PTR_ERR(bd);
395 }
396 pdv->pdv_bd = bd;
397
398 ret = pscsi_add_device_to_list(dev, sd);
399 if (ret) {
400 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
401 scsi_device_put(sd);
402 return ret;
403 }
404
405 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%llu\n",
406 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
407 return 0;
408 }
409
410 /*
411 * Called with struct Scsi_Host->host_lock called.
412 */
413 static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
414 __releases(sh->host_lock)
415 {
416 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
417 struct Scsi_Host *sh = sd->host;
418 int ret;
419
420 if (scsi_device_get(sd)) {
421 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
422 sh->host_no, sd->channel, sd->id, sd->lun);
423 spin_unlock_irq(sh->host_lock);
424 return -EIO;
425 }
426 spin_unlock_irq(sh->host_lock);
427
428 ret = pscsi_add_device_to_list(dev, sd);
429 if (ret) {
430 scsi_device_put(sd);
431 return ret;
432 }
433 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
434 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
435 sd->channel, sd->id, sd->lun);
436
437 return 0;
438 }
439
440 /*
441 * Called with struct Scsi_Host->host_lock called.
442 */
443 static int pscsi_create_type_other(struct se_device *dev,
444 struct scsi_device *sd)
445 __releases(sh->host_lock)
446 {
447 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
448 struct Scsi_Host *sh = sd->host;
449 int ret;
450
451 spin_unlock_irq(sh->host_lock);
452 ret = pscsi_add_device_to_list(dev, sd);
453 if (ret)
454 return ret;
455
456 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
457 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
458 sd->channel, sd->id, sd->lun);
459 return 0;
460 }
461
462 static int pscsi_configure_device(struct se_device *dev)
463 {
464 struct se_hba *hba = dev->se_hba;
465 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
466 struct scsi_device *sd;
467 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
468 struct Scsi_Host *sh = phv->phv_lld_host;
469 int legacy_mode_enable = 0;
470 int ret;
471
472 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
473 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
474 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
475 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
476 " scsi_lun_id= parameters\n");
477 return -EINVAL;
478 }
479
480 /*
481 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
482 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
483 */
484 if (!sh) {
485 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
486 pr_err("pSCSI: Unable to locate struct"
487 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
488 return -ENODEV;
489 }
490 /*
491 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
492 * reference, we enforce that udev_path has been set
493 */
494 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
495 pr_err("pSCSI: udev_path attribute has not"
496 " been set before ENABLE=1\n");
497 return -EINVAL;
498 }
499 /*
500 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
501 * use the original TCM hba ID to reference Linux/SCSI Host No
502 * and enable for PHV_LLD_SCSI_HOST_NO mode.
503 */
504 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
505 if (hba->dev_count) {
506 pr_err("pSCSI: Unable to set hba_mode"
507 " with active devices\n");
508 return -EEXIST;
509 }
510
511 if (pscsi_pmode_enable_hba(hba, 1) != 1)
512 return -ENODEV;
513
514 legacy_mode_enable = 1;
515 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
516 sh = phv->phv_lld_host;
517 } else {
518 sh = scsi_host_lookup(pdv->pdv_host_id);
519 if (!sh) {
520 pr_err("pSCSI: Unable to locate"
521 " pdv_host_id: %d\n", pdv->pdv_host_id);
522 return -EINVAL;
523 }
524 pdv->pdv_lld_host = sh;
525 }
526 } else {
527 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
528 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
529 " struct Scsi_Host exists\n");
530 return -EEXIST;
531 }
532 }
533
534 spin_lock_irq(sh->host_lock);
535 list_for_each_entry(sd, &sh->__devices, siblings) {
536 if ((pdv->pdv_channel_id != sd->channel) ||
537 (pdv->pdv_target_id != sd->id) ||
538 (pdv->pdv_lun_id != sd->lun))
539 continue;
540 /*
541 * Functions will release the held struct scsi_host->host_lock
542 * before calling calling pscsi_add_device_to_list() to register
543 * struct scsi_device with target_core_mod.
544 */
545 switch (sd->type) {
546 case TYPE_DISK:
547 ret = pscsi_create_type_disk(dev, sd);
548 break;
549 case TYPE_ROM:
550 ret = pscsi_create_type_rom(dev, sd);
551 break;
552 default:
553 ret = pscsi_create_type_other(dev, sd);
554 break;
555 }
556
557 if (ret) {
558 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
559 scsi_host_put(sh);
560 else if (legacy_mode_enable) {
561 pscsi_pmode_enable_hba(hba, 0);
562 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
563 }
564 pdv->pdv_sd = NULL;
565 return ret;
566 }
567 return 0;
568 }
569 spin_unlock_irq(sh->host_lock);
570
571 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
572 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
573
574 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
575 scsi_host_put(sh);
576 else if (legacy_mode_enable) {
577 pscsi_pmode_enable_hba(hba, 0);
578 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
579 }
580
581 return -ENODEV;
582 }
583
584 static void pscsi_free_device(struct se_device *dev)
585 {
586 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
587 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
588 struct scsi_device *sd = pdv->pdv_sd;
589
590 if (sd) {
591 /*
592 * Release exclusive pSCSI internal struct block_device claim for
593 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
594 */
595 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
596 blkdev_put(pdv->pdv_bd,
597 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
598 pdv->pdv_bd = NULL;
599 }
600 /*
601 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
602 * to struct Scsi_Host now.
603 */
604 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
605 (phv->phv_lld_host != NULL))
606 scsi_host_put(phv->phv_lld_host);
607 else if (pdv->pdv_lld_host)
608 scsi_host_put(pdv->pdv_lld_host);
609
610 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
611 scsi_device_put(sd);
612
613 pdv->pdv_sd = NULL;
614 }
615
616 kfree(pdv);
617 }
618
619 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
620 unsigned char *sense_buffer)
621 {
622 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
623 struct scsi_device *sd = pdv->pdv_sd;
624 int result;
625 struct pscsi_plugin_task *pt = cmd->priv;
626 unsigned char *cdb;
627 /*
628 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
629 * not been allocated because TCM is handling the emulation directly.
630 */
631 if (!pt)
632 return;
633
634 cdb = &pt->pscsi_cdb[0];
635 result = pt->pscsi_result;
636 /*
637 * Hack to make sure that Write-Protect modepage is set if R/O mode is
638 * forced.
639 */
640 if (!cmd->se_deve || !cmd->data_length)
641 goto after_mode_sense;
642
643 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
644 (status_byte(result) << 1) == SAM_STAT_GOOD) {
645 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
646 unsigned char *buf;
647
648 buf = transport_kmap_data_sg(cmd);
649 if (!buf)
650 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
651
652 if (cdb[0] == MODE_SENSE_10) {
653 if (!(buf[3] & 0x80))
654 buf[3] |= 0x80;
655 } else {
656 if (!(buf[2] & 0x80))
657 buf[2] |= 0x80;
658 }
659
660 transport_kunmap_data_sg(cmd);
661 }
662 }
663 after_mode_sense:
664
665 if (sd->type != TYPE_TAPE || !cmd->data_length)
666 goto after_mode_select;
667
668 /*
669 * Hack to correctly obtain the initiator requested blocksize for
670 * TYPE_TAPE. Since this value is dependent upon each tape media,
671 * struct scsi_device->sector_size will not contain the correct value
672 * by default, so we go ahead and set it so
673 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
674 * storage engine.
675 */
676 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
677 (status_byte(result) << 1) == SAM_STAT_GOOD) {
678 unsigned char *buf;
679 u16 bdl;
680 u32 blocksize;
681
682 buf = sg_virt(&sg[0]);
683 if (!buf) {
684 pr_err("Unable to get buf for scatterlist\n");
685 goto after_mode_select;
686 }
687
688 if (cdb[0] == MODE_SELECT)
689 bdl = (buf[3]);
690 else
691 bdl = (buf[6] << 8) | (buf[7]);
692
693 if (!bdl)
694 goto after_mode_select;
695
696 if (cdb[0] == MODE_SELECT)
697 blocksize = (buf[9] << 16) | (buf[10] << 8) |
698 (buf[11]);
699 else
700 blocksize = (buf[13] << 16) | (buf[14] << 8) |
701 (buf[15]);
702
703 sd->sector_size = blocksize;
704 }
705 after_mode_select:
706
707 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
708 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
709 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
710 }
711 }
712
713 enum {
714 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
715 Opt_scsi_lun_id, Opt_err
716 };
717
718 static match_table_t tokens = {
719 {Opt_scsi_host_id, "scsi_host_id=%d"},
720 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
721 {Opt_scsi_target_id, "scsi_target_id=%d"},
722 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
723 {Opt_err, NULL}
724 };
725
726 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
727 const char *page, ssize_t count)
728 {
729 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
730 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
731 char *orig, *ptr, *opts;
732 substring_t args[MAX_OPT_ARGS];
733 int ret = 0, arg, token;
734
735 opts = kstrdup(page, GFP_KERNEL);
736 if (!opts)
737 return -ENOMEM;
738
739 orig = opts;
740
741 while ((ptr = strsep(&opts, ",\n")) != NULL) {
742 if (!*ptr)
743 continue;
744
745 token = match_token(ptr, tokens, args);
746 switch (token) {
747 case Opt_scsi_host_id:
748 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
749 pr_err("PSCSI[%d]: Unable to accept"
750 " scsi_host_id while phv_mode =="
751 " PHV_LLD_SCSI_HOST_NO\n",
752 phv->phv_host_id);
753 ret = -EINVAL;
754 goto out;
755 }
756 ret = match_int(args, &arg);
757 if (ret)
758 goto out;
759 pdv->pdv_host_id = arg;
760 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
761 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
762 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
763 break;
764 case Opt_scsi_channel_id:
765 ret = match_int(args, &arg);
766 if (ret)
767 goto out;
768 pdv->pdv_channel_id = arg;
769 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
770 " ID: %d\n", phv->phv_host_id,
771 pdv->pdv_channel_id);
772 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
773 break;
774 case Opt_scsi_target_id:
775 ret = match_int(args, &arg);
776 if (ret)
777 goto out;
778 pdv->pdv_target_id = arg;
779 pr_debug("PSCSI[%d]: Referencing SCSI Target"
780 " ID: %d\n", phv->phv_host_id,
781 pdv->pdv_target_id);
782 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
783 break;
784 case Opt_scsi_lun_id:
785 ret = match_int(args, &arg);
786 if (ret)
787 goto out;
788 pdv->pdv_lun_id = arg;
789 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
790 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
791 pdv->pdv_flags |= PDF_HAS_LUN_ID;
792 break;
793 default:
794 break;
795 }
796 }
797
798 out:
799 kfree(orig);
800 return (!ret) ? count : ret;
801 }
802
803 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
804 {
805 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
806 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
807 struct scsi_device *sd = pdv->pdv_sd;
808 unsigned char host_id[16];
809 ssize_t bl;
810 int i;
811
812 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
813 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
814 else
815 snprintf(host_id, 16, "PHBA Mode");
816
817 bl = sprintf(b, "SCSI Device Bus Location:"
818 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
819 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
820 host_id);
821
822 if (sd) {
823 bl += sprintf(b + bl, " ");
824 bl += sprintf(b + bl, "Vendor: ");
825 for (i = 0; i < 8; i++) {
826 if (ISPRINT(sd->vendor[i])) /* printable character? */
827 bl += sprintf(b + bl, "%c", sd->vendor[i]);
828 else
829 bl += sprintf(b + bl, " ");
830 }
831 bl += sprintf(b + bl, " Model: ");
832 for (i = 0; i < 16; i++) {
833 if (ISPRINT(sd->model[i])) /* printable character ? */
834 bl += sprintf(b + bl, "%c", sd->model[i]);
835 else
836 bl += sprintf(b + bl, " ");
837 }
838 bl += sprintf(b + bl, " Rev: ");
839 for (i = 0; i < 4; i++) {
840 if (ISPRINT(sd->rev[i])) /* printable character ? */
841 bl += sprintf(b + bl, "%c", sd->rev[i]);
842 else
843 bl += sprintf(b + bl, " ");
844 }
845 bl += sprintf(b + bl, "\n");
846 }
847 return bl;
848 }
849
850 static void pscsi_bi_endio(struct bio *bio, int error)
851 {
852 bio_put(bio);
853 }
854
855 static inline struct bio *pscsi_get_bio(int nr_vecs)
856 {
857 struct bio *bio;
858 /*
859 * Use bio_malloc() following the comment in for bio -> struct request
860 * in block/blk-core.c:blk_make_request()
861 */
862 bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
863 if (!bio) {
864 pr_err("PSCSI: bio_kmalloc() failed\n");
865 return NULL;
866 }
867 bio->bi_end_io = pscsi_bi_endio;
868
869 return bio;
870 }
871
872 static sense_reason_t
873 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
874 enum dma_data_direction data_direction, struct bio **hbio)
875 {
876 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
877 struct bio *bio = NULL, *tbio = NULL;
878 struct page *page;
879 struct scatterlist *sg;
880 u32 data_len = cmd->data_length, i, len, bytes, off;
881 int nr_pages = (cmd->data_length + sgl[0].offset +
882 PAGE_SIZE - 1) >> PAGE_SHIFT;
883 int nr_vecs = 0, rc;
884 int rw = (data_direction == DMA_TO_DEVICE);
885
886 *hbio = NULL;
887
888 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
889
890 for_each_sg(sgl, sg, sgl_nents, i) {
891 page = sg_page(sg);
892 off = sg->offset;
893 len = sg->length;
894
895 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
896 page, len, off);
897
898 /*
899 * We only have one page of data in each sg element,
900 * we can not cross a page boundary.
901 */
902 if (off + len > PAGE_SIZE)
903 goto fail;
904
905 if (len > 0 && data_len > 0) {
906 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
907 bytes = min(bytes, data_len);
908
909 if (!bio) {
910 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
911 nr_pages -= nr_vecs;
912 /*
913 * Calls bio_kmalloc() and sets bio->bi_end_io()
914 */
915 bio = pscsi_get_bio(nr_vecs);
916 if (!bio)
917 goto fail;
918
919 if (rw)
920 bio->bi_rw |= REQ_WRITE;
921
922 pr_debug("PSCSI: Allocated bio: %p,"
923 " dir: %s nr_vecs: %d\n", bio,
924 (rw) ? "rw" : "r", nr_vecs);
925 /*
926 * Set *hbio pointer to handle the case:
927 * nr_pages > BIO_MAX_PAGES, where additional
928 * bios need to be added to complete a given
929 * command.
930 */
931 if (!*hbio)
932 *hbio = tbio = bio;
933 else
934 tbio = tbio->bi_next = bio;
935 }
936
937 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
938 " bio: %p page: %p len: %d off: %d\n", i, bio,
939 page, len, off);
940
941 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
942 bio, page, bytes, off);
943 if (rc != bytes)
944 goto fail;
945
946 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
947 bio->bi_vcnt, nr_vecs);
948
949 if (bio->bi_vcnt > nr_vecs) {
950 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
951 " %d i: %d bio: %p, allocating another"
952 " bio\n", bio->bi_vcnt, i, bio);
953 /*
954 * Clear the pointer so that another bio will
955 * be allocated with pscsi_get_bio() above, the
956 * current bio has already been set *tbio and
957 * bio->bi_next.
958 */
959 bio = NULL;
960 }
961
962 data_len -= bytes;
963 }
964 }
965
966 return 0;
967 fail:
968 while (*hbio) {
969 bio = *hbio;
970 *hbio = (*hbio)->bi_next;
971 bio_endio(bio, 0); /* XXX: should be error */
972 }
973 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
974 }
975
976 static sense_reason_t
977 pscsi_parse_cdb(struct se_cmd *cmd)
978 {
979 if (cmd->se_cmd_flags & SCF_BIDI)
980 return TCM_UNSUPPORTED_SCSI_OPCODE;
981
982 return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
983 }
984
985 static sense_reason_t
986 pscsi_execute_cmd(struct se_cmd *cmd)
987 {
988 struct scatterlist *sgl = cmd->t_data_sg;
989 u32 sgl_nents = cmd->t_data_nents;
990 enum dma_data_direction data_direction = cmd->data_direction;
991 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
992 struct pscsi_plugin_task *pt;
993 struct request *req;
994 struct bio *hbio;
995 sense_reason_t ret;
996
997 /*
998 * Dynamically alloc cdb space, since it may be larger than
999 * TCM_MAX_COMMAND_SIZE
1000 */
1001 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1002 if (!pt) {
1003 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1004 }
1005 cmd->priv = pt;
1006
1007 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1008 scsi_command_size(cmd->t_task_cdb));
1009
1010 if (!sgl) {
1011 req = blk_get_request(pdv->pdv_sd->request_queue,
1012 (data_direction == DMA_TO_DEVICE),
1013 GFP_KERNEL);
1014 if (IS_ERR(req)) {
1015 pr_err("PSCSI: blk_get_request() failed\n");
1016 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1017 goto fail;
1018 }
1019
1020 blk_rq_set_block_pc(req);
1021 } else {
1022 BUG_ON(!cmd->data_length);
1023
1024 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1025 if (ret)
1026 goto fail;
1027
1028 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1029 GFP_KERNEL);
1030 if (IS_ERR(req)) {
1031 pr_err("pSCSI: blk_make_request() failed\n");
1032 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1033 goto fail_free_bio;
1034 }
1035 }
1036
1037 req->end_io = pscsi_req_done;
1038 req->end_io_data = cmd;
1039 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1040 req->cmd = &pt->pscsi_cdb[0];
1041 req->sense = &pt->pscsi_sense[0];
1042 req->sense_len = 0;
1043 if (pdv->pdv_sd->type == TYPE_DISK)
1044 req->timeout = PS_TIMEOUT_DISK;
1045 else
1046 req->timeout = PS_TIMEOUT_OTHER;
1047 req->retries = PS_RETRY;
1048
1049 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1050 (cmd->sam_task_attr == TCM_HEAD_TAG),
1051 pscsi_req_done);
1052
1053 return 0;
1054
1055 fail_free_bio:
1056 while (hbio) {
1057 struct bio *bio = hbio;
1058 hbio = hbio->bi_next;
1059 bio_endio(bio, 0); /* XXX: should be error */
1060 }
1061 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1062 fail:
1063 kfree(pt);
1064 return ret;
1065 }
1066
1067 /* pscsi_get_device_type():
1068 *
1069 *
1070 */
1071 static u32 pscsi_get_device_type(struct se_device *dev)
1072 {
1073 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1074 struct scsi_device *sd = pdv->pdv_sd;
1075
1076 return (sd) ? sd->type : TYPE_NO_LUN;
1077 }
1078
1079 static sector_t pscsi_get_blocks(struct se_device *dev)
1080 {
1081 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1082
1083 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1084 return pdv->pdv_bd->bd_part->nr_sects;
1085
1086 dump_stack();
1087 return 0;
1088 }
1089
1090 static void pscsi_req_done(struct request *req, int uptodate)
1091 {
1092 struct se_cmd *cmd = req->end_io_data;
1093 struct pscsi_plugin_task *pt = cmd->priv;
1094
1095 pt->pscsi_result = req->errors;
1096 pt->pscsi_resid = req->resid_len;
1097
1098 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1099 if (cmd->scsi_status) {
1100 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1101 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1102 pt->pscsi_result);
1103 }
1104
1105 switch (host_byte(pt->pscsi_result)) {
1106 case DID_OK:
1107 target_complete_cmd(cmd, cmd->scsi_status);
1108 break;
1109 default:
1110 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1111 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1112 pt->pscsi_result);
1113 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1114 break;
1115 }
1116
1117 __blk_put_request(req->q, req);
1118 kfree(pt);
1119 }
1120
1121 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_pi_prot_type);
1122 TB_DEV_ATTR_RO(pscsi, hw_pi_prot_type);
1123
1124 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_block_size);
1125 TB_DEV_ATTR_RO(pscsi, hw_block_size);
1126
1127 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_max_sectors);
1128 TB_DEV_ATTR_RO(pscsi, hw_max_sectors);
1129
1130 DEF_TB_DEV_ATTRIB_RO(pscsi, hw_queue_depth);
1131 TB_DEV_ATTR_RO(pscsi, hw_queue_depth);
1132
1133 static struct configfs_attribute *pscsi_backend_dev_attrs[] = {
1134 &pscsi_dev_attrib_hw_pi_prot_type.attr,
1135 &pscsi_dev_attrib_hw_block_size.attr,
1136 &pscsi_dev_attrib_hw_max_sectors.attr,
1137 &pscsi_dev_attrib_hw_queue_depth.attr,
1138 NULL,
1139 };
1140
1141 static struct se_subsystem_api pscsi_template = {
1142 .name = "pscsi",
1143 .owner = THIS_MODULE,
1144 .transport_flags = TRANSPORT_FLAG_PASSTHROUGH,
1145 .attach_hba = pscsi_attach_hba,
1146 .detach_hba = pscsi_detach_hba,
1147 .pmode_enable_hba = pscsi_pmode_enable_hba,
1148 .alloc_device = pscsi_alloc_device,
1149 .configure_device = pscsi_configure_device,
1150 .free_device = pscsi_free_device,
1151 .transport_complete = pscsi_transport_complete,
1152 .parse_cdb = pscsi_parse_cdb,
1153 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1154 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1155 .get_device_type = pscsi_get_device_type,
1156 .get_blocks = pscsi_get_blocks,
1157 };
1158
1159 static int __init pscsi_module_init(void)
1160 {
1161 struct target_backend_cits *tbc = &pscsi_template.tb_cits;
1162
1163 target_core_setup_sub_cits(&pscsi_template);
1164 tbc->tb_dev_attrib_cit.ct_attrs = pscsi_backend_dev_attrs;
1165
1166 return transport_subsystem_register(&pscsi_template);
1167 }
1168
1169 static void __exit pscsi_module_exit(void)
1170 {
1171 transport_subsystem_release(&pscsi_template);
1172 }
1173
1174 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1175 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1176 MODULE_LICENSE("GPL");
1177
1178 module_init(pscsi_module_init);
1179 module_exit(pscsi_module_exit);
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