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target: header reshuffle, part2
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_pscsi.c
1 /*******************************************************************************
2 * Filename: target_core_pscsi.c
3 *
4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
5 *
6 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
29 #include <linux/string.h>
30 #include <linux/parser.h>
31 #include <linux/timer.h>
32 #include <linux/blkdev.h>
33 #include <linux/blk_types.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/genhd.h>
37 #include <linux/cdrom.h>
38 #include <linux/file.h>
39 #include <linux/module.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_host.h>
44 #include <scsi/scsi_tcq.h>
45
46 #include <target/target_core_base.h>
47 #include <target/target_core_backend.h>
48
49 #include "target_core_pscsi.h"
50
51 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
52
53 static struct se_subsystem_api pscsi_template;
54
55 static void pscsi_req_done(struct request *, int);
56
57 /* pscsi_attach_hba():
58 *
59 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
60 * from the passed SCSI Host ID.
61 */
62 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
63 {
64 struct pscsi_hba_virt *phv;
65
66 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
67 if (!phv) {
68 pr_err("Unable to allocate struct pscsi_hba_virt\n");
69 return -ENOMEM;
70 }
71 phv->phv_host_id = host_id;
72 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
73
74 hba->hba_ptr = phv;
75
76 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
77 " Generic Target Core Stack %s\n", hba->hba_id,
78 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
79 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
80 hba->hba_id);
81
82 return 0;
83 }
84
85 static void pscsi_detach_hba(struct se_hba *hba)
86 {
87 struct pscsi_hba_virt *phv = hba->hba_ptr;
88 struct Scsi_Host *scsi_host = phv->phv_lld_host;
89
90 if (scsi_host) {
91 scsi_host_put(scsi_host);
92
93 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
94 " Generic Target Core\n", hba->hba_id,
95 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
96 "Unknown");
97 } else
98 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
99 " from Generic Target Core\n", hba->hba_id);
100
101 kfree(phv);
102 hba->hba_ptr = NULL;
103 }
104
105 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
106 {
107 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
108 struct Scsi_Host *sh = phv->phv_lld_host;
109 /*
110 * Release the struct Scsi_Host
111 */
112 if (!mode_flag) {
113 if (!sh)
114 return 0;
115
116 phv->phv_lld_host = NULL;
117 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
118
119 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
120 " %s\n", hba->hba_id, (sh->hostt->name) ?
121 (sh->hostt->name) : "Unknown");
122
123 scsi_host_put(sh);
124 return 0;
125 }
126 /*
127 * Otherwise, locate struct Scsi_Host from the original passed
128 * pSCSI Host ID and enable for phba mode
129 */
130 sh = scsi_host_lookup(phv->phv_host_id);
131 if (IS_ERR(sh)) {
132 pr_err("pSCSI: Unable to locate SCSI Host for"
133 " phv_host_id: %d\n", phv->phv_host_id);
134 return PTR_ERR(sh);
135 }
136
137 phv->phv_lld_host = sh;
138 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
139
140 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
141 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
142
143 return 1;
144 }
145
146 static void pscsi_tape_read_blocksize(struct se_device *dev,
147 struct scsi_device *sdev)
148 {
149 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
150 int ret;
151
152 buf = kzalloc(12, GFP_KERNEL);
153 if (!buf)
154 return;
155
156 memset(cdb, 0, MAX_COMMAND_SIZE);
157 cdb[0] = MODE_SENSE;
158 cdb[4] = 0x0c; /* 12 bytes */
159
160 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
161 HZ, 1, NULL);
162 if (ret)
163 goto out_free;
164
165 /*
166 * If MODE_SENSE still returns zero, set the default value to 1024.
167 */
168 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
169 if (!sdev->sector_size)
170 sdev->sector_size = 1024;
171 out_free:
172 kfree(buf);
173 }
174
175 static void
176 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
177 {
178 unsigned char *buf;
179
180 if (sdev->inquiry_len < INQUIRY_LEN)
181 return;
182
183 buf = sdev->inquiry;
184 if (!buf)
185 return;
186 /*
187 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
188 */
189 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
190 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
191 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
192 }
193
194 static int
195 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
196 {
197 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
198 int ret;
199
200 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
201 if (!buf)
202 return -ENOMEM;
203
204 memset(cdb, 0, MAX_COMMAND_SIZE);
205 cdb[0] = INQUIRY;
206 cdb[1] = 0x01; /* Query VPD */
207 cdb[2] = 0x80; /* Unit Serial Number */
208 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
209 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
210
211 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
212 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
213 if (ret)
214 goto out_free;
215
216 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
217
218 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
219
220 kfree(buf);
221 return 0;
222
223 out_free:
224 kfree(buf);
225 return -EPERM;
226 }
227
228 static void
229 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
230 struct t10_wwn *wwn)
231 {
232 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
233 int ident_len, page_len, off = 4, ret;
234 struct t10_vpd *vpd;
235
236 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
237 if (!buf)
238 return;
239
240 memset(cdb, 0, MAX_COMMAND_SIZE);
241 cdb[0] = INQUIRY;
242 cdb[1] = 0x01; /* Query VPD */
243 cdb[2] = 0x83; /* Device Identifier */
244 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
245 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
246
247 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
248 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
249 NULL, HZ, 1, NULL);
250 if (ret)
251 goto out;
252
253 page_len = (buf[2] << 8) | buf[3];
254 while (page_len > 0) {
255 /* Grab a pointer to the Identification descriptor */
256 page_83 = &buf[off];
257 ident_len = page_83[3];
258 if (!ident_len) {
259 pr_err("page_83[3]: identifier"
260 " length zero!\n");
261 break;
262 }
263 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
264
265 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
266 if (!vpd) {
267 pr_err("Unable to allocate memory for"
268 " struct t10_vpd\n");
269 goto out;
270 }
271 INIT_LIST_HEAD(&vpd->vpd_list);
272
273 transport_set_vpd_proto_id(vpd, page_83);
274 transport_set_vpd_assoc(vpd, page_83);
275
276 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
277 off += (ident_len + 4);
278 page_len -= (ident_len + 4);
279 kfree(vpd);
280 continue;
281 }
282 if (transport_set_vpd_ident(vpd, page_83) < 0) {
283 off += (ident_len + 4);
284 page_len -= (ident_len + 4);
285 kfree(vpd);
286 continue;
287 }
288
289 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
290 off += (ident_len + 4);
291 page_len -= (ident_len + 4);
292 }
293
294 out:
295 kfree(buf);
296 }
297
298 /* pscsi_add_device_to_list():
299 *
300 *
301 */
302 static struct se_device *pscsi_add_device_to_list(
303 struct se_hba *hba,
304 struct se_subsystem_dev *se_dev,
305 struct pscsi_dev_virt *pdv,
306 struct scsi_device *sd,
307 int dev_flags)
308 {
309 struct se_device *dev;
310 struct se_dev_limits dev_limits;
311 struct request_queue *q;
312 struct queue_limits *limits;
313
314 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
315
316 if (!sd->queue_depth) {
317 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
318
319 pr_err("Set broken SCSI Device %d:%d:%d"
320 " queue_depth to %d\n", sd->channel, sd->id,
321 sd->lun, sd->queue_depth);
322 }
323 /*
324 * Setup the local scope queue_limits from struct request_queue->limits
325 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
326 */
327 q = sd->request_queue;
328 limits = &dev_limits.limits;
329 limits->logical_block_size = sd->sector_size;
330 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
331 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
332 dev_limits.hw_queue_depth = sd->queue_depth;
333 dev_limits.queue_depth = sd->queue_depth;
334 /*
335 * Setup our standard INQUIRY info into se_dev->t10_wwn
336 */
337 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
338
339 /*
340 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
341 * which has already been referenced with Linux SCSI code with
342 * scsi_device_get() in this file's pscsi_create_virtdevice().
343 *
344 * The passthrough operations called by the transport_add_device_*
345 * function below will require this pointer to be set for passthroug
346 * ops.
347 *
348 * For the shutdown case in pscsi_free_device(), this struct
349 * scsi_device reference is released with Linux SCSI code
350 * scsi_device_put() and the pdv->pdv_sd cleared.
351 */
352 pdv->pdv_sd = sd;
353
354 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
355 se_dev, dev_flags, pdv,
356 &dev_limits, NULL, NULL);
357 if (!dev) {
358 pdv->pdv_sd = NULL;
359 return NULL;
360 }
361
362 /*
363 * Locate VPD WWN Information used for various purposes within
364 * the Storage Engine.
365 */
366 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
367 /*
368 * If VPD Unit Serial returned GOOD status, try
369 * VPD Device Identification page (0x83).
370 */
371 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
372 }
373
374 /*
375 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
376 */
377 if (sd->type == TYPE_TAPE)
378 pscsi_tape_read_blocksize(dev, sd);
379 return dev;
380 }
381
382 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
383 {
384 struct pscsi_dev_virt *pdv;
385
386 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
387 if (!pdv) {
388 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
389 return NULL;
390 }
391 pdv->pdv_se_hba = hba;
392
393 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
394 return pdv;
395 }
396
397 /*
398 * Called with struct Scsi_Host->host_lock called.
399 */
400 static struct se_device *pscsi_create_type_disk(
401 struct scsi_device *sd,
402 struct pscsi_dev_virt *pdv,
403 struct se_subsystem_dev *se_dev,
404 struct se_hba *hba)
405 __releases(sh->host_lock)
406 {
407 struct se_device *dev;
408 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
409 struct Scsi_Host *sh = sd->host;
410 struct block_device *bd;
411 u32 dev_flags = 0;
412
413 if (scsi_device_get(sd)) {
414 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
415 sh->host_no, sd->channel, sd->id, sd->lun);
416 spin_unlock_irq(sh->host_lock);
417 return NULL;
418 }
419 spin_unlock_irq(sh->host_lock);
420 /*
421 * Claim exclusive struct block_device access to struct scsi_device
422 * for TYPE_DISK using supplied udev_path
423 */
424 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
425 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
426 if (IS_ERR(bd)) {
427 pr_err("pSCSI: blkdev_get_by_path() failed\n");
428 scsi_device_put(sd);
429 return NULL;
430 }
431 pdv->pdv_bd = bd;
432
433 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
434 if (!dev) {
435 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
436 scsi_device_put(sd);
437 return NULL;
438 }
439 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
440 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
441
442 return dev;
443 }
444
445 /*
446 * Called with struct Scsi_Host->host_lock called.
447 */
448 static struct se_device *pscsi_create_type_rom(
449 struct scsi_device *sd,
450 struct pscsi_dev_virt *pdv,
451 struct se_subsystem_dev *se_dev,
452 struct se_hba *hba)
453 __releases(sh->host_lock)
454 {
455 struct se_device *dev;
456 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
457 struct Scsi_Host *sh = sd->host;
458 u32 dev_flags = 0;
459
460 if (scsi_device_get(sd)) {
461 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
462 sh->host_no, sd->channel, sd->id, sd->lun);
463 spin_unlock_irq(sh->host_lock);
464 return NULL;
465 }
466 spin_unlock_irq(sh->host_lock);
467
468 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
469 if (!dev) {
470 scsi_device_put(sd);
471 return NULL;
472 }
473 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
474 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
475 sd->channel, sd->id, sd->lun);
476
477 return dev;
478 }
479
480 /*
481 *Called with struct Scsi_Host->host_lock called.
482 */
483 static struct se_device *pscsi_create_type_other(
484 struct scsi_device *sd,
485 struct pscsi_dev_virt *pdv,
486 struct se_subsystem_dev *se_dev,
487 struct se_hba *hba)
488 __releases(sh->host_lock)
489 {
490 struct se_device *dev;
491 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
492 struct Scsi_Host *sh = sd->host;
493 u32 dev_flags = 0;
494
495 spin_unlock_irq(sh->host_lock);
496 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
497 if (!dev)
498 return NULL;
499
500 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
501 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
502 sd->channel, sd->id, sd->lun);
503
504 return dev;
505 }
506
507 static struct se_device *pscsi_create_virtdevice(
508 struct se_hba *hba,
509 struct se_subsystem_dev *se_dev,
510 void *p)
511 {
512 struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
513 struct se_device *dev;
514 struct scsi_device *sd;
515 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
516 struct Scsi_Host *sh = phv->phv_lld_host;
517 int legacy_mode_enable = 0;
518
519 if (!pdv) {
520 pr_err("Unable to locate struct pscsi_dev_virt"
521 " parameter\n");
522 return ERR_PTR(-EINVAL);
523 }
524 /*
525 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
526 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
527 */
528 if (!sh) {
529 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
530 pr_err("pSCSI: Unable to locate struct"
531 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
532 return ERR_PTR(-ENODEV);
533 }
534 /*
535 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
536 * reference, we enforce that udev_path has been set
537 */
538 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
539 pr_err("pSCSI: udev_path attribute has not"
540 " been set before ENABLE=1\n");
541 return ERR_PTR(-EINVAL);
542 }
543 /*
544 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
545 * use the original TCM hba ID to reference Linux/SCSI Host No
546 * and enable for PHV_LLD_SCSI_HOST_NO mode.
547 */
548 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
549 spin_lock(&hba->device_lock);
550 if (!list_empty(&hba->hba_dev_list)) {
551 pr_err("pSCSI: Unable to set hba_mode"
552 " with active devices\n");
553 spin_unlock(&hba->device_lock);
554 return ERR_PTR(-EEXIST);
555 }
556 spin_unlock(&hba->device_lock);
557
558 if (pscsi_pmode_enable_hba(hba, 1) != 1)
559 return ERR_PTR(-ENODEV);
560
561 legacy_mode_enable = 1;
562 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
563 sh = phv->phv_lld_host;
564 } else {
565 sh = scsi_host_lookup(pdv->pdv_host_id);
566 if (IS_ERR(sh)) {
567 pr_err("pSCSI: Unable to locate"
568 " pdv_host_id: %d\n", pdv->pdv_host_id);
569 return ERR_CAST(sh);
570 }
571 }
572 } else {
573 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
574 pr_err("pSCSI: PHV_VIRUTAL_HOST_ID set while"
575 " struct Scsi_Host exists\n");
576 return ERR_PTR(-EEXIST);
577 }
578 }
579
580 spin_lock_irq(sh->host_lock);
581 list_for_each_entry(sd, &sh->__devices, siblings) {
582 if ((pdv->pdv_channel_id != sd->channel) ||
583 (pdv->pdv_target_id != sd->id) ||
584 (pdv->pdv_lun_id != sd->lun))
585 continue;
586 /*
587 * Functions will release the held struct scsi_host->host_lock
588 * before calling calling pscsi_add_device_to_list() to register
589 * struct scsi_device with target_core_mod.
590 */
591 switch (sd->type) {
592 case TYPE_DISK:
593 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
594 break;
595 case TYPE_ROM:
596 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
597 break;
598 default:
599 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
600 break;
601 }
602
603 if (!dev) {
604 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
605 scsi_host_put(sh);
606 else if (legacy_mode_enable) {
607 pscsi_pmode_enable_hba(hba, 0);
608 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
609 }
610 pdv->pdv_sd = NULL;
611 return ERR_PTR(-ENODEV);
612 }
613 return dev;
614 }
615 spin_unlock_irq(sh->host_lock);
616
617 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
618 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
619
620 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
621 scsi_host_put(sh);
622 else if (legacy_mode_enable) {
623 pscsi_pmode_enable_hba(hba, 0);
624 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
625 }
626
627 return ERR_PTR(-ENODEV);
628 }
629
630 /* pscsi_free_device(): (Part of se_subsystem_api_t template)
631 *
632 *
633 */
634 static void pscsi_free_device(void *p)
635 {
636 struct pscsi_dev_virt *pdv = p;
637 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
638 struct scsi_device *sd = pdv->pdv_sd;
639
640 if (sd) {
641 /*
642 * Release exclusive pSCSI internal struct block_device claim for
643 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
644 */
645 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
646 blkdev_put(pdv->pdv_bd,
647 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
648 pdv->pdv_bd = NULL;
649 }
650 /*
651 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
652 * to struct Scsi_Host now.
653 */
654 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
655 (phv->phv_lld_host != NULL))
656 scsi_host_put(phv->phv_lld_host);
657
658 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
659 scsi_device_put(sd);
660
661 pdv->pdv_sd = NULL;
662 }
663
664 kfree(pdv);
665 }
666
667 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
668 {
669 return container_of(task, struct pscsi_plugin_task, pscsi_task);
670 }
671
672
673 /* pscsi_transport_complete():
674 *
675 *
676 */
677 static int pscsi_transport_complete(struct se_task *task)
678 {
679 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
680 struct scsi_device *sd = pdv->pdv_sd;
681 int result;
682 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
683 unsigned char *cdb = &pt->pscsi_cdb[0];
684
685 result = pt->pscsi_result;
686 /*
687 * Hack to make sure that Write-Protect modepage is set if R/O mode is
688 * forced.
689 */
690 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
691 (status_byte(result) << 1) == SAM_STAT_GOOD) {
692 if (!task->task_se_cmd->se_deve)
693 goto after_mode_sense;
694
695 if (task->task_se_cmd->se_deve->lun_flags &
696 TRANSPORT_LUNFLAGS_READ_ONLY) {
697 unsigned char *buf = transport_kmap_first_data_page(task->task_se_cmd);
698
699 if (cdb[0] == MODE_SENSE_10) {
700 if (!(buf[3] & 0x80))
701 buf[3] |= 0x80;
702 } else {
703 if (!(buf[2] & 0x80))
704 buf[2] |= 0x80;
705 }
706
707 transport_kunmap_first_data_page(task->task_se_cmd);
708 }
709 }
710 after_mode_sense:
711
712 if (sd->type != TYPE_TAPE)
713 goto after_mode_select;
714
715 /*
716 * Hack to correctly obtain the initiator requested blocksize for
717 * TYPE_TAPE. Since this value is dependent upon each tape media,
718 * struct scsi_device->sector_size will not contain the correct value
719 * by default, so we go ahead and set it so
720 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
721 * storage engine.
722 */
723 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
724 (status_byte(result) << 1) == SAM_STAT_GOOD) {
725 unsigned char *buf;
726 struct scatterlist *sg = task->task_sg;
727 u16 bdl;
728 u32 blocksize;
729
730 buf = sg_virt(&sg[0]);
731 if (!buf) {
732 pr_err("Unable to get buf for scatterlist\n");
733 goto after_mode_select;
734 }
735
736 if (cdb[0] == MODE_SELECT)
737 bdl = (buf[3]);
738 else
739 bdl = (buf[6] << 8) | (buf[7]);
740
741 if (!bdl)
742 goto after_mode_select;
743
744 if (cdb[0] == MODE_SELECT)
745 blocksize = (buf[9] << 16) | (buf[10] << 8) |
746 (buf[11]);
747 else
748 blocksize = (buf[13] << 16) | (buf[14] << 8) |
749 (buf[15]);
750
751 sd->sector_size = blocksize;
752 }
753 after_mode_select:
754
755 if (status_byte(result) & CHECK_CONDITION)
756 return 1;
757
758 return 0;
759 }
760
761 static struct se_task *
762 pscsi_alloc_task(unsigned char *cdb)
763 {
764 struct pscsi_plugin_task *pt;
765
766 /*
767 * Dynamically alloc cdb space, since it may be larger than
768 * TCM_MAX_COMMAND_SIZE
769 */
770 pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL);
771 if (!pt) {
772 pr_err("Unable to allocate struct pscsi_plugin_task\n");
773 return NULL;
774 }
775
776 return &pt->pscsi_task;
777 }
778
779 static void pscsi_free_task(struct se_task *task)
780 {
781 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
782
783 /*
784 * We do not release the bio(s) here associated with this task, as
785 * this is handled by bio_put() and pscsi_bi_endio().
786 */
787 kfree(pt);
788 }
789
790 enum {
791 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
792 Opt_scsi_lun_id, Opt_err
793 };
794
795 static match_table_t tokens = {
796 {Opt_scsi_host_id, "scsi_host_id=%d"},
797 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
798 {Opt_scsi_target_id, "scsi_target_id=%d"},
799 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
800 {Opt_err, NULL}
801 };
802
803 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
804 struct se_subsystem_dev *se_dev,
805 const char *page,
806 ssize_t count)
807 {
808 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
809 struct pscsi_hba_virt *phv = hba->hba_ptr;
810 char *orig, *ptr, *opts;
811 substring_t args[MAX_OPT_ARGS];
812 int ret = 0, arg, token;
813
814 opts = kstrdup(page, GFP_KERNEL);
815 if (!opts)
816 return -ENOMEM;
817
818 orig = opts;
819
820 while ((ptr = strsep(&opts, ",")) != NULL) {
821 if (!*ptr)
822 continue;
823
824 token = match_token(ptr, tokens, args);
825 switch (token) {
826 case Opt_scsi_host_id:
827 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
828 pr_err("PSCSI[%d]: Unable to accept"
829 " scsi_host_id while phv_mode =="
830 " PHV_LLD_SCSI_HOST_NO\n",
831 phv->phv_host_id);
832 ret = -EINVAL;
833 goto out;
834 }
835 match_int(args, &arg);
836 pdv->pdv_host_id = arg;
837 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
838 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
839 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
840 break;
841 case Opt_scsi_channel_id:
842 match_int(args, &arg);
843 pdv->pdv_channel_id = arg;
844 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
845 " ID: %d\n", phv->phv_host_id,
846 pdv->pdv_channel_id);
847 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
848 break;
849 case Opt_scsi_target_id:
850 match_int(args, &arg);
851 pdv->pdv_target_id = arg;
852 pr_debug("PSCSI[%d]: Referencing SCSI Target"
853 " ID: %d\n", phv->phv_host_id,
854 pdv->pdv_target_id);
855 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
856 break;
857 case Opt_scsi_lun_id:
858 match_int(args, &arg);
859 pdv->pdv_lun_id = arg;
860 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
861 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
862 pdv->pdv_flags |= PDF_HAS_LUN_ID;
863 break;
864 default:
865 break;
866 }
867 }
868
869 out:
870 kfree(orig);
871 return (!ret) ? count : ret;
872 }
873
874 static ssize_t pscsi_check_configfs_dev_params(
875 struct se_hba *hba,
876 struct se_subsystem_dev *se_dev)
877 {
878 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
879
880 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
881 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
882 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
883 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
884 " scsi_lun_id= parameters\n");
885 return -EINVAL;
886 }
887
888 return 0;
889 }
890
891 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
892 struct se_subsystem_dev *se_dev,
893 char *b)
894 {
895 struct pscsi_hba_virt *phv = hba->hba_ptr;
896 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
897 struct scsi_device *sd = pdv->pdv_sd;
898 unsigned char host_id[16];
899 ssize_t bl;
900 int i;
901
902 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
903 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
904 else
905 snprintf(host_id, 16, "PHBA Mode");
906
907 bl = sprintf(b, "SCSI Device Bus Location:"
908 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
909 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
910 host_id);
911
912 if (sd) {
913 bl += sprintf(b + bl, " ");
914 bl += sprintf(b + bl, "Vendor: ");
915 for (i = 0; i < 8; i++) {
916 if (ISPRINT(sd->vendor[i])) /* printable character? */
917 bl += sprintf(b + bl, "%c", sd->vendor[i]);
918 else
919 bl += sprintf(b + bl, " ");
920 }
921 bl += sprintf(b + bl, " Model: ");
922 for (i = 0; i < 16; i++) {
923 if (ISPRINT(sd->model[i])) /* printable character ? */
924 bl += sprintf(b + bl, "%c", sd->model[i]);
925 else
926 bl += sprintf(b + bl, " ");
927 }
928 bl += sprintf(b + bl, " Rev: ");
929 for (i = 0; i < 4; i++) {
930 if (ISPRINT(sd->rev[i])) /* printable character ? */
931 bl += sprintf(b + bl, "%c", sd->rev[i]);
932 else
933 bl += sprintf(b + bl, " ");
934 }
935 bl += sprintf(b + bl, "\n");
936 }
937 return bl;
938 }
939
940 static void pscsi_bi_endio(struct bio *bio, int error)
941 {
942 bio_put(bio);
943 }
944
945 static inline struct bio *pscsi_get_bio(int sg_num)
946 {
947 struct bio *bio;
948 /*
949 * Use bio_malloc() following the comment in for bio -> struct request
950 * in block/blk-core.c:blk_make_request()
951 */
952 bio = bio_kmalloc(GFP_KERNEL, sg_num);
953 if (!bio) {
954 pr_err("PSCSI: bio_kmalloc() failed\n");
955 return NULL;
956 }
957 bio->bi_end_io = pscsi_bi_endio;
958
959 return bio;
960 }
961
962 static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
963 struct bio **hbio)
964 {
965 struct se_cmd *cmd = task->task_se_cmd;
966 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
967 u32 task_sg_num = task->task_sg_nents;
968 struct bio *bio = NULL, *tbio = NULL;
969 struct page *page;
970 struct scatterlist *sg;
971 u32 data_len = task->task_size, i, len, bytes, off;
972 int nr_pages = (task->task_size + task_sg[0].offset +
973 PAGE_SIZE - 1) >> PAGE_SHIFT;
974 int nr_vecs = 0, rc;
975 int rw = (task->task_data_direction == DMA_TO_DEVICE);
976
977 *hbio = NULL;
978
979 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
980
981 for_each_sg(task_sg, sg, task_sg_num, i) {
982 page = sg_page(sg);
983 off = sg->offset;
984 len = sg->length;
985
986 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
987 page, len, off);
988
989 while (len > 0 && data_len > 0) {
990 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
991 bytes = min(bytes, data_len);
992
993 if (!bio) {
994 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
995 nr_pages -= nr_vecs;
996 /*
997 * Calls bio_kmalloc() and sets bio->bi_end_io()
998 */
999 bio = pscsi_get_bio(nr_vecs);
1000 if (!bio)
1001 goto fail;
1002
1003 if (rw)
1004 bio->bi_rw |= REQ_WRITE;
1005
1006 pr_debug("PSCSI: Allocated bio: %p,"
1007 " dir: %s nr_vecs: %d\n", bio,
1008 (rw) ? "rw" : "r", nr_vecs);
1009 /*
1010 * Set *hbio pointer to handle the case:
1011 * nr_pages > BIO_MAX_PAGES, where additional
1012 * bios need to be added to complete a given
1013 * struct se_task
1014 */
1015 if (!*hbio)
1016 *hbio = tbio = bio;
1017 else
1018 tbio = tbio->bi_next = bio;
1019 }
1020
1021 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
1022 " bio: %p page: %p len: %d off: %d\n", i, bio,
1023 page, len, off);
1024
1025 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1026 bio, page, bytes, off);
1027 if (rc != bytes)
1028 goto fail;
1029
1030 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1031 bio->bi_vcnt, nr_vecs);
1032
1033 if (bio->bi_vcnt > nr_vecs) {
1034 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1035 " %d i: %d bio: %p, allocating another"
1036 " bio\n", bio->bi_vcnt, i, bio);
1037 /*
1038 * Clear the pointer so that another bio will
1039 * be allocated with pscsi_get_bio() above, the
1040 * current bio has already been set *tbio and
1041 * bio->bi_next.
1042 */
1043 bio = NULL;
1044 }
1045
1046 page++;
1047 len -= bytes;
1048 data_len -= bytes;
1049 off = 0;
1050 }
1051 }
1052
1053 return task->task_sg_nents;
1054 fail:
1055 while (*hbio) {
1056 bio = *hbio;
1057 *hbio = (*hbio)->bi_next;
1058 bio->bi_next = NULL;
1059 bio_endio(bio, 0); /* XXX: should be error */
1060 }
1061 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1062 return -ENOMEM;
1063 }
1064
1065 static int pscsi_do_task(struct se_task *task)
1066 {
1067 struct se_cmd *cmd = task->task_se_cmd;
1068 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
1069 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1070 struct request *req;
1071 struct bio *hbio;
1072 int ret;
1073
1074 target_get_task_cdb(task, pt->pscsi_cdb);
1075
1076 if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
1077 req = blk_get_request(pdv->pdv_sd->request_queue,
1078 (task->task_data_direction == DMA_TO_DEVICE),
1079 GFP_KERNEL);
1080 if (!req || IS_ERR(req)) {
1081 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1082 req ? IS_ERR(req) : -ENOMEM);
1083 cmd->scsi_sense_reason =
1084 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1085 return -ENODEV;
1086 }
1087 } else {
1088 BUG_ON(!task->task_size);
1089
1090 /*
1091 * Setup the main struct request for the task->task_sg[] payload
1092 */
1093 ret = pscsi_map_sg(task, task->task_sg, &hbio);
1094 if (ret < 0) {
1095 cmd->scsi_sense_reason =
1096 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1097 return ret;
1098 }
1099
1100 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1101 GFP_KERNEL);
1102 if (IS_ERR(req)) {
1103 pr_err("pSCSI: blk_make_request() failed\n");
1104 goto fail;
1105 }
1106 }
1107
1108 req->cmd_type = REQ_TYPE_BLOCK_PC;
1109 req->end_io = pscsi_req_done;
1110 req->end_io_data = task;
1111 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1112 req->cmd = &pt->pscsi_cdb[0];
1113 req->sense = &pt->pscsi_sense[0];
1114 req->sense_len = 0;
1115 if (pdv->pdv_sd->type == TYPE_DISK)
1116 req->timeout = PS_TIMEOUT_DISK;
1117 else
1118 req->timeout = PS_TIMEOUT_OTHER;
1119 req->retries = PS_RETRY;
1120
1121 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1122 (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
1123 pscsi_req_done);
1124
1125 return 0;
1126
1127 fail:
1128 while (hbio) {
1129 struct bio *bio = hbio;
1130 hbio = hbio->bi_next;
1131 bio->bi_next = NULL;
1132 bio_endio(bio, 0); /* XXX: should be error */
1133 }
1134 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1135 return -ENOMEM;
1136 }
1137
1138 /* pscsi_get_sense_buffer():
1139 *
1140 *
1141 */
1142 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1143 {
1144 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1145
1146 return (unsigned char *)&pt->pscsi_sense[0];
1147 }
1148
1149 /* pscsi_get_device_rev():
1150 *
1151 *
1152 */
1153 static u32 pscsi_get_device_rev(struct se_device *dev)
1154 {
1155 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1156 struct scsi_device *sd = pdv->pdv_sd;
1157
1158 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1159 }
1160
1161 /* pscsi_get_device_type():
1162 *
1163 *
1164 */
1165 static u32 pscsi_get_device_type(struct se_device *dev)
1166 {
1167 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1168 struct scsi_device *sd = pdv->pdv_sd;
1169
1170 return sd->type;
1171 }
1172
1173 static sector_t pscsi_get_blocks(struct se_device *dev)
1174 {
1175 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1176
1177 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1178 return pdv->pdv_bd->bd_part->nr_sects;
1179
1180 dump_stack();
1181 return 0;
1182 }
1183
1184 /* pscsi_handle_SAM_STATUS_failures():
1185 *
1186 *
1187 */
1188 static inline void pscsi_process_SAM_status(
1189 struct se_task *task,
1190 struct pscsi_plugin_task *pt)
1191 {
1192 task->task_scsi_status = status_byte(pt->pscsi_result);
1193 if (task->task_scsi_status) {
1194 task->task_scsi_status <<= 1;
1195 pr_debug("PSCSI Status Byte exception at task: %p CDB:"
1196 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1197 pt->pscsi_result);
1198 }
1199
1200 switch (host_byte(pt->pscsi_result)) {
1201 case DID_OK:
1202 transport_complete_task(task, (!task->task_scsi_status));
1203 break;
1204 default:
1205 pr_debug("PSCSI Host Byte exception at task: %p CDB:"
1206 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1207 pt->pscsi_result);
1208 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1209 task->task_se_cmd->scsi_sense_reason =
1210 TCM_UNSUPPORTED_SCSI_OPCODE;
1211 transport_complete_task(task, 0);
1212 break;
1213 }
1214 }
1215
1216 static void pscsi_req_done(struct request *req, int uptodate)
1217 {
1218 struct se_task *task = req->end_io_data;
1219 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1220
1221 pt->pscsi_result = req->errors;
1222 pt->pscsi_resid = req->resid_len;
1223
1224 pscsi_process_SAM_status(task, pt);
1225 __blk_put_request(req->q, req);
1226 }
1227
1228 static struct se_subsystem_api pscsi_template = {
1229 .name = "pscsi",
1230 .owner = THIS_MODULE,
1231 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1232 .attach_hba = pscsi_attach_hba,
1233 .detach_hba = pscsi_detach_hba,
1234 .pmode_enable_hba = pscsi_pmode_enable_hba,
1235 .allocate_virtdevice = pscsi_allocate_virtdevice,
1236 .create_virtdevice = pscsi_create_virtdevice,
1237 .free_device = pscsi_free_device,
1238 .transport_complete = pscsi_transport_complete,
1239 .alloc_task = pscsi_alloc_task,
1240 .do_task = pscsi_do_task,
1241 .free_task = pscsi_free_task,
1242 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1243 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1244 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1245 .get_sense_buffer = pscsi_get_sense_buffer,
1246 .get_device_rev = pscsi_get_device_rev,
1247 .get_device_type = pscsi_get_device_type,
1248 .get_blocks = pscsi_get_blocks,
1249 };
1250
1251 static int __init pscsi_module_init(void)
1252 {
1253 return transport_subsystem_register(&pscsi_template);
1254 }
1255
1256 static void pscsi_module_exit(void)
1257 {
1258 transport_subsystem_release(&pscsi_template);
1259 }
1260
1261 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1262 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1263 MODULE_LICENSE("GPL");
1264
1265 module_init(pscsi_module_init);
1266 module_exit(pscsi_module_exit);