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selftests/x86: Test __kernel_sigreturn and __kernel_rt_sigreturn
[linux-2.6/btrfs-unstable.git] / drivers / target / target_core_pscsi.c
blobde18790eb21c0d79cc36e7479a2876b13ca195dc
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_device.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_tcq.h>
42
43 #include <target/target_core_base.h>
44 #include <target/target_core_backend.h>
45
46 #include "target_core_alua.h"
47 #include "target_core_internal.h"
48 #include "target_core_pscsi.h"
49
50 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
51
52 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
53 {
54 return container_of(dev, struct pscsi_dev_virt, dev);
55 }
56
57 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
58 static void pscsi_req_done(struct request *, int);
59
60 /* pscsi_attach_hba():
61 *
62 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
63 * from the passed SCSI Host ID.
64 */
65 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
66 {
67 struct pscsi_hba_virt *phv;
68
69 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
70 if (!phv) {
71 pr_err("Unable to allocate struct pscsi_hba_virt\n");
72 return -ENOMEM;
73 }
74 phv->phv_host_id = host_id;
75 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
76
77 hba->hba_ptr = phv;
78
79 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
80 " Generic Target Core Stack %s\n", hba->hba_id,
81 PSCSI_VERSION, TARGET_CORE_VERSION);
82 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
83 hba->hba_id);
84
85 return 0;
86 }
87
88 static void pscsi_detach_hba(struct se_hba *hba)
89 {
90 struct pscsi_hba_virt *phv = hba->hba_ptr;
91 struct Scsi_Host *scsi_host = phv->phv_lld_host;
92
93 if (scsi_host) {
94 scsi_host_put(scsi_host);
95
96 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
97 " Generic Target Core\n", hba->hba_id,
98 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
99 "Unknown");
100 } else
101 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
102 " from Generic Target Core\n", hba->hba_id);
103
104 kfree(phv);
105 hba->hba_ptr = NULL;
106 }
107
108 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
109 {
110 struct pscsi_hba_virt *phv = hba->hba_ptr;
111 struct Scsi_Host *sh = phv->phv_lld_host;
112 /*
113 * Release the struct Scsi_Host
114 */
115 if (!mode_flag) {
116 if (!sh)
117 return 0;
118
119 phv->phv_lld_host = NULL;
120 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
121
122 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
123 " %s\n", hba->hba_id, (sh->hostt->name) ?
124 (sh->hostt->name) : "Unknown");
125
126 scsi_host_put(sh);
127 return 0;
128 }
129 /*
130 * Otherwise, locate struct Scsi_Host from the original passed
131 * pSCSI Host ID and enable for phba mode
132 */
133 sh = scsi_host_lookup(phv->phv_host_id);
134 if (!sh) {
135 pr_err("pSCSI: Unable to locate SCSI Host for"
136 " phv_host_id: %d\n", phv->phv_host_id);
137 return -EINVAL;
138 }
139
140 phv->phv_lld_host = sh;
141 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
142
143 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
144 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
145
146 return 1;
147 }
148
149 static void pscsi_tape_read_blocksize(struct se_device *dev,
150 struct scsi_device *sdev)
151 {
152 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
153 int ret;
154
155 buf = kzalloc(12, GFP_KERNEL);
156 if (!buf)
157 return;
158
159 memset(cdb, 0, MAX_COMMAND_SIZE);
160 cdb[0] = MODE_SENSE;
161 cdb[4] = 0x0c; /* 12 bytes */
162
163 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
164 HZ, 1, NULL);
165 if (ret)
166 goto out_free;
167
168 /*
169 * If MODE_SENSE still returns zero, set the default value to 1024.
170 */
171 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
172 if (!sdev->sector_size)
173 sdev->sector_size = 1024;
174 out_free:
175 kfree(buf);
176 }
177
178 static void
179 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
180 {
181 unsigned char *buf;
182
183 if (sdev->inquiry_len < INQUIRY_LEN)
184 return;
185
186 buf = sdev->inquiry;
187 if (!buf)
188 return;
189 /*
190 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
191 */
192 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
193 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
194 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
195 }
196
197 static int
198 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
199 {
200 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
201 int ret;
202
203 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
204 if (!buf)
205 return -ENOMEM;
206
207 memset(cdb, 0, MAX_COMMAND_SIZE);
208 cdb[0] = INQUIRY;
209 cdb[1] = 0x01; /* Query VPD */
210 cdb[2] = 0x80; /* Unit Serial Number */
211 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
212 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
213
214 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
215 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
216 if (ret)
217 goto out_free;
218
219 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
220
221 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
222
223 kfree(buf);
224 return 0;
225
226 out_free:
227 kfree(buf);
228 return -EPERM;
229 }
230
231 static void
232 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
233 struct t10_wwn *wwn)
234 {
235 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
236 int ident_len, page_len, off = 4, ret;
237 struct t10_vpd *vpd;
238
239 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
240 if (!buf)
241 return;
242
243 memset(cdb, 0, MAX_COMMAND_SIZE);
244 cdb[0] = INQUIRY;
245 cdb[1] = 0x01; /* Query VPD */
246 cdb[2] = 0x83; /* Device Identifier */
247 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
248 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
249
250 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
251 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
252 NULL, HZ, 1, NULL);
253 if (ret)
254 goto out;
255
256 page_len = (buf[2] << 8) | buf[3];
257 while (page_len > 0) {
258 /* Grab a pointer to the Identification descriptor */
259 page_83 = &buf[off];
260 ident_len = page_83[3];
261 if (!ident_len) {
262 pr_err("page_83[3]: identifier"
263 " length zero!\n");
264 break;
265 }
266 pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
267
268 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
269 if (!vpd) {
270 pr_err("Unable to allocate memory for"
271 " struct t10_vpd\n");
272 goto out;
273 }
274 INIT_LIST_HEAD(&vpd->vpd_list);
275
276 transport_set_vpd_proto_id(vpd, page_83);
277 transport_set_vpd_assoc(vpd, page_83);
278
279 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
280 off += (ident_len + 4);
281 page_len -= (ident_len + 4);
282 kfree(vpd);
283 continue;
284 }
285 if (transport_set_vpd_ident(vpd, page_83) < 0) {
286 off += (ident_len + 4);
287 page_len -= (ident_len + 4);
288 kfree(vpd);
289 continue;
290 }
291
292 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
293 off += (ident_len + 4);
294 page_len -= (ident_len + 4);
295 }
296
297 out:
298 kfree(buf);
299 }
300
301 static int pscsi_add_device_to_list(struct se_device *dev,
302 struct scsi_device *sd)
303 {
304 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
305 struct request_queue *q = sd->request_queue;
306
307 pdv->pdv_sd = sd;
308
309 if (!sd->queue_depth) {
310 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
311
312 pr_err("Set broken SCSI Device %d:%d:%llu"
313 " queue_depth to %d\n", sd->channel, sd->id,
314 sd->lun, sd->queue_depth);
315 }
316
317 dev->dev_attrib.hw_block_size = sd->sector_size;
318 dev->dev_attrib.hw_max_sectors =
319 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
320 dev->dev_attrib.hw_queue_depth = sd->queue_depth;
321
322 /*
323 * Setup our standard INQUIRY info into se_dev->t10_wwn
324 */
325 pscsi_set_inquiry_info(sd, &dev->t10_wwn);
326
327 /*
328 * Locate VPD WWN Information used for various purposes within
329 * the Storage Engine.
330 */
331 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
332 /*
333 * If VPD Unit Serial returned GOOD status, try
334 * VPD Device Identification page (0x83).
335 */
336 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
337 }
338
339 /*
340 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
341 */
342 if (sd->type == TYPE_TAPE)
343 pscsi_tape_read_blocksize(dev, sd);
344 return 0;
345 }
346
347 static struct se_device *pscsi_alloc_device(struct se_hba *hba,
348 const char *name)
349 {
350 struct pscsi_dev_virt *pdv;
351
352 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
353 if (!pdv) {
354 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
355 return NULL;
356 }
357
358 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
359 return &pdv->dev;
360 }
361
362 /*
363 * Called with struct Scsi_Host->host_lock called.
364 */
365 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
366 __releases(sh->host_lock)
367 {
368 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
369 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
370 struct Scsi_Host *sh = sd->host;
371 struct block_device *bd;
372 int ret;
373
374 if (scsi_device_get(sd)) {
375 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
376 sh->host_no, sd->channel, sd->id, sd->lun);
377 spin_unlock_irq(sh->host_lock);
378 return -EIO;
379 }
380 spin_unlock_irq(sh->host_lock);
381 /*
382 * Claim exclusive struct block_device access to struct scsi_device
383 * for TYPE_DISK using supplied udev_path
384 */
385 bd = blkdev_get_by_path(dev->udev_path,
386 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
387 if (IS_ERR(bd)) {
388 pr_err("pSCSI: blkdev_get_by_path() failed\n");
389 scsi_device_put(sd);
390 return PTR_ERR(bd);
391 }
392 pdv->pdv_bd = bd;
393
394 ret = pscsi_add_device_to_list(dev, sd);
395 if (ret) {
396 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
397 scsi_device_put(sd);
398 return ret;
399 }
400
401 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%llu\n",
402 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
403 return 0;
404 }
405
406 /*
407 * Called with struct Scsi_Host->host_lock called.
408 */
409 static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd)
410 __releases(sh->host_lock)
411 {
412 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
413 struct Scsi_Host *sh = sd->host;
414 int ret;
415
416 if (scsi_device_get(sd)) {
417 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
418 sh->host_no, sd->channel, sd->id, sd->lun);
419 spin_unlock_irq(sh->host_lock);
420 return -EIO;
421 }
422 spin_unlock_irq(sh->host_lock);
423
424 ret = pscsi_add_device_to_list(dev, sd);
425 if (ret) {
426 scsi_device_put(sd);
427 return ret;
428 }
429 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
430 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
431 sd->channel, sd->id, sd->lun);
432
433 return 0;
434 }
435
436 /*
437 * Called with struct Scsi_Host->host_lock called.
438 */
439 static int pscsi_create_type_other(struct se_device *dev,
440 struct scsi_device *sd)
441 __releases(sh->host_lock)
442 {
443 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
444 struct Scsi_Host *sh = sd->host;
445 int ret;
446
447 spin_unlock_irq(sh->host_lock);
448 ret = pscsi_add_device_to_list(dev, sd);
449 if (ret)
450 return ret;
451
452 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
453 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
454 sd->channel, sd->id, sd->lun);
455 return 0;
456 }
457
458 static int pscsi_configure_device(struct se_device *dev)
459 {
460 struct se_hba *hba = dev->se_hba;
461 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
462 struct scsi_device *sd;
463 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
464 struct Scsi_Host *sh = phv->phv_lld_host;
465 int legacy_mode_enable = 0;
466 int ret;
467
468 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
469 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
470 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
471 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
472 " scsi_lun_id= parameters\n");
473 return -EINVAL;
474 }
475
476 /*
477 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
478 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
479 */
480 if (!sh) {
481 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
482 pr_err("pSCSI: Unable to locate struct"
483 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
484 return -ENODEV;
485 }
486 /*
487 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
488 * reference, we enforce that udev_path has been set
489 */
490 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
491 pr_err("pSCSI: udev_path attribute has not"
492 " been set before ENABLE=1\n");
493 return -EINVAL;
494 }
495 /*
496 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
497 * use the original TCM hba ID to reference Linux/SCSI Host No
498 * and enable for PHV_LLD_SCSI_HOST_NO mode.
499 */
500 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
501 if (hba->dev_count) {
502 pr_err("pSCSI: Unable to set hba_mode"
503 " with active devices\n");
504 return -EEXIST;
505 }
506
507 if (pscsi_pmode_enable_hba(hba, 1) != 1)
508 return -ENODEV;
509
510 legacy_mode_enable = 1;
511 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
512 sh = phv->phv_lld_host;
513 } else {
514 sh = scsi_host_lookup(pdv->pdv_host_id);
515 if (!sh) {
516 pr_err("pSCSI: Unable to locate"
517 " pdv_host_id: %d\n", pdv->pdv_host_id);
518 return -EINVAL;
519 }
520 pdv->pdv_lld_host = sh;
521 }
522 } else {
523 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
524 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
525 " struct Scsi_Host exists\n");
526 return -EEXIST;
527 }
528 }
529
530 spin_lock_irq(sh->host_lock);
531 list_for_each_entry(sd, &sh->__devices, siblings) {
532 if ((pdv->pdv_channel_id != sd->channel) ||
533 (pdv->pdv_target_id != sd->id) ||
534 (pdv->pdv_lun_id != sd->lun))
535 continue;
536 /*
537 * Functions will release the held struct scsi_host->host_lock
538 * before calling calling pscsi_add_device_to_list() to register
539 * struct scsi_device with target_core_mod.
540 */
541 switch (sd->type) {
542 case TYPE_DISK:
543 ret = pscsi_create_type_disk(dev, sd);
544 break;
545 case TYPE_ROM:
546 ret = pscsi_create_type_rom(dev, sd);
547 break;
548 default:
549 ret = pscsi_create_type_other(dev, sd);
550 break;
551 }
552
553 if (ret) {
554 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
555 scsi_host_put(sh);
556 else if (legacy_mode_enable) {
557 pscsi_pmode_enable_hba(hba, 0);
558 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
559 }
560 pdv->pdv_sd = NULL;
561 return ret;
562 }
563 return 0;
564 }
565 spin_unlock_irq(sh->host_lock);
566
567 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
568 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
569
570 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
571 scsi_host_put(sh);
572 else if (legacy_mode_enable) {
573 pscsi_pmode_enable_hba(hba, 0);
574 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
575 }
576
577 return -ENODEV;
578 }
579
580 static void pscsi_dev_call_rcu(struct rcu_head *p)
581 {
582 struct se_device *dev = container_of(p, struct se_device, rcu_head);
583 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
584
585 kfree(pdv);
586 }
587
588 static void pscsi_free_device(struct se_device *dev)
589 {
590 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
591 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
592 struct scsi_device *sd = pdv->pdv_sd;
593
594 if (sd) {
595 /*
596 * Release exclusive pSCSI internal struct block_device claim for
597 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
598 */
599 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
600 blkdev_put(pdv->pdv_bd,
601 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
602 pdv->pdv_bd = NULL;
603 }
604 /*
605 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
606 * to struct Scsi_Host now.
607 */
608 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
609 (phv->phv_lld_host != NULL))
610 scsi_host_put(phv->phv_lld_host);
611 else if (pdv->pdv_lld_host)
612 scsi_host_put(pdv->pdv_lld_host);
613
614 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
615 scsi_device_put(sd);
616
617 pdv->pdv_sd = NULL;
618 }
619 call_rcu(&dev->rcu_head, pscsi_dev_call_rcu);
620 }
621
622 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
623 unsigned char *sense_buffer)
624 {
625 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
626 struct scsi_device *sd = pdv->pdv_sd;
627 int result;
628 struct pscsi_plugin_task *pt = cmd->priv;
629 unsigned char *cdb;
630 /*
631 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
632 * not been allocated because TCM is handling the emulation directly.
633 */
634 if (!pt)
635 return;
636
637 cdb = &pt->pscsi_cdb[0];
638 result = pt->pscsi_result;
639 /*
640 * Hack to make sure that Write-Protect modepage is set if R/O mode is
641 * forced.
642 */
643 if (!cmd->data_length)
644 goto after_mode_sense;
645
646 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
647 (status_byte(result) << 1) == SAM_STAT_GOOD) {
648 bool read_only = target_lun_is_rdonly(cmd);
649
650 if (read_only) {
651 unsigned char *buf;
652
653 buf = transport_kmap_data_sg(cmd);
654 if (!buf)
655 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
656
657 if (cdb[0] == MODE_SENSE_10) {
658 if (!(buf[3] & 0x80))
659 buf[3] |= 0x80;
660 } else {
661 if (!(buf[2] & 0x80))
662 buf[2] |= 0x80;
663 }
664
665 transport_kunmap_data_sg(cmd);
666 }
667 }
668 after_mode_sense:
669
670 if (sd->type != TYPE_TAPE || !cmd->data_length)
671 goto after_mode_select;
672
673 /*
674 * Hack to correctly obtain the initiator requested blocksize for
675 * TYPE_TAPE. Since this value is dependent upon each tape media,
676 * struct scsi_device->sector_size will not contain the correct value
677 * by default, so we go ahead and set it so
678 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
679 * storage engine.
680 */
681 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
682 (status_byte(result) << 1) == SAM_STAT_GOOD) {
683 unsigned char *buf;
684 u16 bdl;
685 u32 blocksize;
686
687 buf = sg_virt(&sg[0]);
688 if (!buf) {
689 pr_err("Unable to get buf for scatterlist\n");
690 goto after_mode_select;
691 }
692
693 if (cdb[0] == MODE_SELECT)
694 bdl = (buf[3]);
695 else
696 bdl = (buf[6] << 8) | (buf[7]);
697
698 if (!bdl)
699 goto after_mode_select;
700
701 if (cdb[0] == MODE_SELECT)
702 blocksize = (buf[9] << 16) | (buf[10] << 8) |
703 (buf[11]);
704 else
705 blocksize = (buf[13] << 16) | (buf[14] << 8) |
706 (buf[15]);
707
708 sd->sector_size = blocksize;
709 }
710 after_mode_select:
711
712 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
713 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
714 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
715 }
716 }
717
718 enum {
719 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
720 Opt_scsi_lun_id, Opt_err
721 };
722
723 static match_table_t tokens = {
724 {Opt_scsi_host_id, "scsi_host_id=%d"},
725 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
726 {Opt_scsi_target_id, "scsi_target_id=%d"},
727 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
728 {Opt_err, NULL}
729 };
730
731 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
732 const char *page, ssize_t count)
733 {
734 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
735 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
736 char *orig, *ptr, *opts;
737 substring_t args[MAX_OPT_ARGS];
738 int ret = 0, arg, token;
739
740 opts = kstrdup(page, GFP_KERNEL);
741 if (!opts)
742 return -ENOMEM;
743
744 orig = opts;
745
746 while ((ptr = strsep(&opts, ",\n")) != NULL) {
747 if (!*ptr)
748 continue;
749
750 token = match_token(ptr, tokens, args);
751 switch (token) {
752 case Opt_scsi_host_id:
753 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
754 pr_err("PSCSI[%d]: Unable to accept"
755 " scsi_host_id while phv_mode =="
756 " PHV_LLD_SCSI_HOST_NO\n",
757 phv->phv_host_id);
758 ret = -EINVAL;
759 goto out;
760 }
761 ret = match_int(args, &arg);
762 if (ret)
763 goto out;
764 pdv->pdv_host_id = arg;
765 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
766 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
767 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
768 break;
769 case Opt_scsi_channel_id:
770 ret = match_int(args, &arg);
771 if (ret)
772 goto out;
773 pdv->pdv_channel_id = arg;
774 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
775 " ID: %d\n", phv->phv_host_id,
776 pdv->pdv_channel_id);
777 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
778 break;
779 case Opt_scsi_target_id:
780 ret = match_int(args, &arg);
781 if (ret)
782 goto out;
783 pdv->pdv_target_id = arg;
784 pr_debug("PSCSI[%d]: Referencing SCSI Target"
785 " ID: %d\n", phv->phv_host_id,
786 pdv->pdv_target_id);
787 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
788 break;
789 case Opt_scsi_lun_id:
790 ret = match_int(args, &arg);
791 if (ret)
792 goto out;
793 pdv->pdv_lun_id = arg;
794 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
795 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
796 pdv->pdv_flags |= PDF_HAS_LUN_ID;
797 break;
798 default:
799 break;
800 }
801 }
802
803 out:
804 kfree(orig);
805 return (!ret) ? count : ret;
806 }
807
808 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
809 {
810 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
811 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
812 struct scsi_device *sd = pdv->pdv_sd;
813 unsigned char host_id[16];
814 ssize_t bl;
815 int i;
816
817 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
818 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
819 else
820 snprintf(host_id, 16, "PHBA Mode");
821
822 bl = sprintf(b, "SCSI Device Bus Location:"
823 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
824 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
825 host_id);
826
827 if (sd) {
828 bl += sprintf(b + bl, " ");
829 bl += sprintf(b + bl, "Vendor: ");
830 for (i = 0; i < 8; i++) {
831 if (ISPRINT(sd->vendor[i])) /* printable character? */
832 bl += sprintf(b + bl, "%c", sd->vendor[i]);
833 else
834 bl += sprintf(b + bl, " ");
835 }
836 bl += sprintf(b + bl, " Model: ");
837 for (i = 0; i < 16; i++) {
838 if (ISPRINT(sd->model[i])) /* printable character ? */
839 bl += sprintf(b + bl, "%c", sd->model[i]);
840 else
841 bl += sprintf(b + bl, " ");
842 }
843 bl += sprintf(b + bl, " Rev: ");
844 for (i = 0; i < 4; i++) {
845 if (ISPRINT(sd->rev[i])) /* printable character ? */
846 bl += sprintf(b + bl, "%c", sd->rev[i]);
847 else
848 bl += sprintf(b + bl, " ");
849 }
850 bl += sprintf(b + bl, "\n");
851 }
852 return bl;
853 }
854
855 static void pscsi_bi_endio(struct bio *bio)
856 {
857 bio_put(bio);
858 }
859
860 static inline struct bio *pscsi_get_bio(int nr_vecs)
861 {
862 struct bio *bio;
863 /*
864 * Use bio_malloc() following the comment in for bio -> struct request
865 * in block/blk-core.c:blk_make_request()
866 */
867 bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
868 if (!bio) {
869 pr_err("PSCSI: bio_kmalloc() failed\n");
870 return NULL;
871 }
872 bio->bi_end_io = pscsi_bi_endio;
873
874 return bio;
875 }
876
877 static sense_reason_t
878 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
879 enum dma_data_direction data_direction, struct bio **hbio)
880 {
881 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
882 struct bio *bio = NULL, *tbio = NULL;
883 struct page *page;
884 struct scatterlist *sg;
885 u32 data_len = cmd->data_length, i, len, bytes, off;
886 int nr_pages = (cmd->data_length + sgl[0].offset +
887 PAGE_SIZE - 1) >> PAGE_SHIFT;
888 int nr_vecs = 0, rc;
889 int rw = (data_direction == DMA_TO_DEVICE);
890
891 *hbio = NULL;
892
893 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
894
895 for_each_sg(sgl, sg, sgl_nents, i) {
896 page = sg_page(sg);
897 off = sg->offset;
898 len = sg->length;
899
900 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
901 page, len, off);
902
903 /*
904 * We only have one page of data in each sg element,
905 * we can not cross a page boundary.
906 */
907 if (off + len > PAGE_SIZE)
908 goto fail;
909
910 if (len > 0 && data_len > 0) {
911 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
912 bytes = min(bytes, data_len);
913
914 if (!bio) {
915 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
916 nr_pages -= nr_vecs;
917 /*
918 * Calls bio_kmalloc() and sets bio->bi_end_io()
919 */
920 bio = pscsi_get_bio(nr_vecs);
921 if (!bio)
922 goto fail;
923
924 if (rw)
925 bio->bi_rw |= REQ_WRITE;
926
927 pr_debug("PSCSI: Allocated bio: %p,"
928 " dir: %s nr_vecs: %d\n", bio,
929 (rw) ? "rw" : "r", nr_vecs);
930 /*
931 * Set *hbio pointer to handle the case:
932 * nr_pages > BIO_MAX_PAGES, where additional
933 * bios need to be added to complete a given
934 * command.
935 */
936 if (!*hbio)
937 *hbio = tbio = bio;
938 else
939 tbio = tbio->bi_next = bio;
940 }
941
942 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
943 " bio: %p page: %p len: %d off: %d\n", i, bio,
944 page, len, off);
945
946 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
947 bio, page, bytes, off);
948 if (rc != bytes)
949 goto fail;
950
951 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
952 bio->bi_vcnt, nr_vecs);
953
954 if (bio->bi_vcnt > nr_vecs) {
955 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
956 " %d i: %d bio: %p, allocating another"
957 " bio\n", bio->bi_vcnt, i, bio);
958 /*
959 * Clear the pointer so that another bio will
960 * be allocated with pscsi_get_bio() above, the
961 * current bio has already been set *tbio and
962 * bio->bi_next.
963 */
964 bio = NULL;
965 }
966
967 data_len -= bytes;
968 }
969 }
970
971 return 0;
972 fail:
973 while (*hbio) {
974 bio = *hbio;
975 *hbio = (*hbio)->bi_next;
976 bio_endio(bio);
977 }
978 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
979 }
980
981 static sense_reason_t
982 pscsi_parse_cdb(struct se_cmd *cmd)
983 {
984 if (cmd->se_cmd_flags & SCF_BIDI)
985 return TCM_UNSUPPORTED_SCSI_OPCODE;
986
987 return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
988 }
989
990 static sense_reason_t
991 pscsi_execute_cmd(struct se_cmd *cmd)
992 {
993 struct scatterlist *sgl = cmd->t_data_sg;
994 u32 sgl_nents = cmd->t_data_nents;
995 enum dma_data_direction data_direction = cmd->data_direction;
996 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
997 struct pscsi_plugin_task *pt;
998 struct request *req;
999 struct bio *hbio;
1000 sense_reason_t ret;
1001
1002 /*
1003 * Dynamically alloc cdb space, since it may be larger than
1004 * TCM_MAX_COMMAND_SIZE
1005 */
1006 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1007 if (!pt) {
1008 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1009 }
1010 cmd->priv = pt;
1011
1012 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1013 scsi_command_size(cmd->t_task_cdb));
1014
1015 if (!sgl) {
1016 req = blk_get_request(pdv->pdv_sd->request_queue,
1017 (data_direction == DMA_TO_DEVICE),
1018 GFP_KERNEL);
1019 if (IS_ERR(req)) {
1020 pr_err("PSCSI: blk_get_request() failed\n");
1021 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1022 goto fail;
1023 }
1024
1025 blk_rq_set_block_pc(req);
1026 } else {
1027 BUG_ON(!cmd->data_length);
1028
1029 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1030 if (ret)
1031 goto fail;
1032
1033 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1034 GFP_KERNEL);
1035 if (IS_ERR(req)) {
1036 pr_err("pSCSI: blk_make_request() failed\n");
1037 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1038 goto fail_free_bio;
1039 }
1040 }
1041
1042 req->end_io = pscsi_req_done;
1043 req->end_io_data = cmd;
1044 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1045 req->cmd = &pt->pscsi_cdb[0];
1046 req->sense = &pt->pscsi_sense[0];
1047 req->sense_len = 0;
1048 if (pdv->pdv_sd->type == TYPE_DISK)
1049 req->timeout = PS_TIMEOUT_DISK;
1050 else
1051 req->timeout = PS_TIMEOUT_OTHER;
1052 req->retries = PS_RETRY;
1053
1054 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1055 (cmd->sam_task_attr == TCM_HEAD_TAG),
1056 pscsi_req_done);
1057
1058 return 0;
1059
1060 fail_free_bio:
1061 while (hbio) {
1062 struct bio *bio = hbio;
1063 hbio = hbio->bi_next;
1064 bio_endio(bio);
1065 }
1066 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1067 fail:
1068 kfree(pt);
1069 return ret;
1070 }
1071
1072 /* pscsi_get_device_type():
1073 *
1074 *
1075 */
1076 static u32 pscsi_get_device_type(struct se_device *dev)
1077 {
1078 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1079 struct scsi_device *sd = pdv->pdv_sd;
1080
1081 return (sd) ? sd->type : TYPE_NO_LUN;
1082 }
1083
1084 static sector_t pscsi_get_blocks(struct se_device *dev)
1085 {
1086 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1087
1088 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1089 return pdv->pdv_bd->bd_part->nr_sects;
1090
1091 dump_stack();
1092 return 0;
1093 }
1094
1095 static void pscsi_req_done(struct request *req, int uptodate)
1096 {
1097 struct se_cmd *cmd = req->end_io_data;
1098 struct pscsi_plugin_task *pt = cmd->priv;
1099
1100 pt->pscsi_result = req->errors;
1101 pt->pscsi_resid = req->resid_len;
1102
1103 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1104 if (cmd->scsi_status) {
1105 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1106 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1107 pt->pscsi_result);
1108 }
1109
1110 switch (host_byte(pt->pscsi_result)) {
1111 case DID_OK:
1112 target_complete_cmd(cmd, cmd->scsi_status);
1113 break;
1114 default:
1115 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1116 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1117 pt->pscsi_result);
1118 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1119 break;
1120 }
1121
1122 __blk_put_request(req->q, req);
1123 kfree(pt);
1124 }
1125
1126 static const struct target_backend_ops pscsi_ops = {
1127 .name = "pscsi",
1128 .owner = THIS_MODULE,
1129 .transport_flags = TRANSPORT_FLAG_PASSTHROUGH,
1130 .attach_hba = pscsi_attach_hba,
1131 .detach_hba = pscsi_detach_hba,
1132 .pmode_enable_hba = pscsi_pmode_enable_hba,
1133 .alloc_device = pscsi_alloc_device,
1134 .configure_device = pscsi_configure_device,
1135 .free_device = pscsi_free_device,
1136 .transport_complete = pscsi_transport_complete,
1137 .parse_cdb = pscsi_parse_cdb,
1138 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1139 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1140 .get_device_type = pscsi_get_device_type,
1141 .get_blocks = pscsi_get_blocks,
1142 .tb_dev_attrib_attrs = passthrough_attrib_attrs,
1143 };
1144
1145 static int __init pscsi_module_init(void)
1146 {
1147 return transport_backend_register(&pscsi_ops);
1148 }
1149
1150 static void __exit pscsi_module_exit(void)
1151 {
1152 target_backend_unregister(&pscsi_ops);
1153 }
1154
1155 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1156 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1157 MODULE_LICENSE("GPL");
1158
1159 module_init(pscsi_module_init);
1160 module_exit(pscsi_module_exit);
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