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[GitHub/mt8127/android_kernel_alcatel_ttab.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 2003-2012 RisingTide Systems LLC.
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
48 #include "target_core_alua.h"
49 #include "target_core_pscsi.h"
50
51 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
52
53 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
54 {
55 return container_of(dev, struct pscsi_dev_virt, dev);
56 }
57
58 static struct se_subsystem_api pscsi_template;
59
60 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
61 static void pscsi_req_done(struct request *, int);
62
63 /* pscsi_attach_hba():
64 *
65 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
66 * from the passed SCSI Host ID.
67 */
68 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
69 {
70 struct pscsi_hba_virt *phv;
71
72 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
73 if (!phv) {
74 pr_err("Unable to allocate struct pscsi_hba_virt\n");
75 return -ENOMEM;
76 }
77 phv->phv_host_id = host_id;
78 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
79
80 hba->hba_ptr = phv;
81
82 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
83 " Generic Target Core Stack %s\n", hba->hba_id,
84 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
85 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
86 hba->hba_id);
87
88 return 0;
89 }
90
91 static void pscsi_detach_hba(struct se_hba *hba)
92 {
93 struct pscsi_hba_virt *phv = hba->hba_ptr;
94 struct Scsi_Host *scsi_host = phv->phv_lld_host;
95
96 if (scsi_host) {
97 scsi_host_put(scsi_host);
98
99 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
100 " Generic Target Core\n", hba->hba_id,
101 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
102 "Unknown");
103 } else
104 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
105 " from Generic Target Core\n", hba->hba_id);
106
107 kfree(phv);
108 hba->hba_ptr = NULL;
109 }
110
111 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
112 {
113 struct pscsi_hba_virt *phv = hba->hba_ptr;
114 struct Scsi_Host *sh = phv->phv_lld_host;
115 /*
116 * Release the struct Scsi_Host
117 */
118 if (!mode_flag) {
119 if (!sh)
120 return 0;
121
122 phv->phv_lld_host = NULL;
123 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
124
125 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
126 " %s\n", hba->hba_id, (sh->hostt->name) ?
127 (sh->hostt->name) : "Unknown");
128
129 scsi_host_put(sh);
130 return 0;
131 }
132 /*
133 * Otherwise, locate struct Scsi_Host from the original passed
134 * pSCSI Host ID and enable for phba mode
135 */
136 sh = scsi_host_lookup(phv->phv_host_id);
137 if (!sh) {
138 pr_err("pSCSI: Unable to locate SCSI Host for"
139 " phv_host_id: %d\n", phv->phv_host_id);
140 return -EINVAL;
141 }
142
143 phv->phv_lld_host = sh;
144 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
145
146 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
147 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
148
149 return 1;
150 }
151
152 static void pscsi_tape_read_blocksize(struct se_device *dev,
153 struct scsi_device *sdev)
154 {
155 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
156 int ret;
157
158 buf = kzalloc(12, GFP_KERNEL);
159 if (!buf)
160 goto out_free;
161
162 memset(cdb, 0, MAX_COMMAND_SIZE);
163 cdb[0] = MODE_SENSE;
164 cdb[4] = 0x0c; /* 12 bytes */
165
166 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
167 HZ, 1, NULL);
168 if (ret)
169 goto out_free;
170
171 /*
172 * If MODE_SENSE still returns zero, set the default value to 1024.
173 */
174 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
175 out_free:
176 if (!sdev->sector_size)
177 sdev->sector_size = 1024;
178
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:%d"
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 =
322 min_not_zero((int)sd->sector_size, 512);
323 dev->dev_attrib.hw_max_sectors =
324 min_not_zero((unsigned)sd->host->max_sectors, queue_max_hw_sectors(q));
325 dev->dev_attrib.hw_queue_depth = sd->queue_depth;
326
327 /*
328 * Setup our standard INQUIRY info into se_dev->t10_wwn
329 */
330 pscsi_set_inquiry_info(sd, &dev->t10_wwn);
331
332 /*
333 * Locate VPD WWN Information used for various purposes within
334 * the Storage Engine.
335 */
336 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
337 /*
338 * If VPD Unit Serial returned GOOD status, try
339 * VPD Device Identification page (0x83).
340 */
341 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
342 }
343
344 /*
345 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
346 */
347 if (sd->type == TYPE_TAPE) {
348 pscsi_tape_read_blocksize(dev, sd);
349 dev->dev_attrib.hw_block_size = sd->sector_size;
350 }
351 return 0;
352 }
353
354 static struct se_device *pscsi_alloc_device(struct se_hba *hba,
355 const char *name)
356 {
357 struct pscsi_dev_virt *pdv;
358
359 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
360 if (!pdv) {
361 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
362 return NULL;
363 }
364
365 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
366 return &pdv->dev;
367 }
368
369 /*
370 * Called with struct Scsi_Host->host_lock called.
371 */
372 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
373 __releases(sh->host_lock)
374 {
375 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
376 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
377 struct Scsi_Host *sh = sd->host;
378 struct block_device *bd;
379 int ret;
380
381 if (scsi_device_get(sd)) {
382 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
383 sh->host_no, sd->channel, sd->id, sd->lun);
384 spin_unlock_irq(sh->host_lock);
385 return -EIO;
386 }
387 spin_unlock_irq(sh->host_lock);
388 /*
389 * Claim exclusive struct block_device access to struct scsi_device
390 * for TYPE_DISK using supplied udev_path
391 */
392 bd = blkdev_get_by_path(dev->udev_path,
393 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
394 if (IS_ERR(bd)) {
395 pr_err("pSCSI: blkdev_get_by_path() failed\n");
396 scsi_device_put(sd);
397 return PTR_ERR(bd);
398 }
399 pdv->pdv_bd = bd;
400
401 ret = pscsi_add_device_to_list(dev, sd);
402 if (ret) {
403 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
404 scsi_device_put(sd);
405 return ret;
406 }
407
408 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
409 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
410 return 0;
411 }
412
413 /*
414 * Called with struct Scsi_Host->host_lock called.
415 */
416 static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd)
417 __releases(sh->host_lock)
418 {
419 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
420 struct Scsi_Host *sh = sd->host;
421 int ret;
422
423 if (scsi_device_get(sd)) {
424 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
425 sh->host_no, sd->channel, sd->id, sd->lun);
426 spin_unlock_irq(sh->host_lock);
427 return -EIO;
428 }
429 spin_unlock_irq(sh->host_lock);
430
431 ret = pscsi_add_device_to_list(dev, sd);
432 if (ret) {
433 scsi_device_put(sd);
434 return ret;
435 }
436 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
437 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
438 sd->channel, sd->id, sd->lun);
439
440 return 0;
441 }
442
443 static int pscsi_configure_device(struct se_device *dev)
444 {
445 struct se_hba *hba = dev->se_hba;
446 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
447 struct scsi_device *sd;
448 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
449 struct Scsi_Host *sh = phv->phv_lld_host;
450 int legacy_mode_enable = 0;
451 int ret;
452
453 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
454 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
455 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
456 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
457 " scsi_lun_id= parameters\n");
458 return -EINVAL;
459 }
460
461 /*
462 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
463 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
464 */
465 if (!sh) {
466 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
467 pr_err("pSCSI: Unable to locate struct"
468 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
469 return -ENODEV;
470 }
471 /*
472 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
473 * reference, we enforce that udev_path has been set
474 */
475 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
476 pr_err("pSCSI: udev_path attribute has not"
477 " been set before ENABLE=1\n");
478 return -EINVAL;
479 }
480 /*
481 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
482 * use the original TCM hba ID to reference Linux/SCSI Host No
483 * and enable for PHV_LLD_SCSI_HOST_NO mode.
484 */
485 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
486 if (hba->dev_count) {
487 pr_err("pSCSI: Unable to set hba_mode"
488 " with active devices\n");
489 return -EEXIST;
490 }
491
492 if (pscsi_pmode_enable_hba(hba, 1) != 1)
493 return -ENODEV;
494
495 legacy_mode_enable = 1;
496 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
497 sh = phv->phv_lld_host;
498 } else {
499 sh = scsi_host_lookup(pdv->pdv_host_id);
500 if (!sh) {
501 pr_err("pSCSI: Unable to locate"
502 " pdv_host_id: %d\n", pdv->pdv_host_id);
503 return -EINVAL;
504 }
505 pdv->pdv_lld_host = sh;
506 }
507 } else {
508 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
509 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
510 " struct Scsi_Host exists\n");
511 return -EEXIST;
512 }
513 }
514
515 spin_lock_irq(sh->host_lock);
516 list_for_each_entry(sd, &sh->__devices, siblings) {
517 if ((pdv->pdv_channel_id != sd->channel) ||
518 (pdv->pdv_target_id != sd->id) ||
519 (pdv->pdv_lun_id != sd->lun))
520 continue;
521 /*
522 * Functions will release the held struct scsi_host->host_lock
523 * before calling calling pscsi_add_device_to_list() to register
524 * struct scsi_device with target_core_mod.
525 */
526 switch (sd->type) {
527 case TYPE_DISK:
528 ret = pscsi_create_type_disk(dev, sd);
529 break;
530 default:
531 ret = pscsi_create_type_nondisk(dev, sd);
532 break;
533 }
534
535 if (ret) {
536 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
537 scsi_host_put(sh);
538 else if (legacy_mode_enable) {
539 pscsi_pmode_enable_hba(hba, 0);
540 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
541 }
542 pdv->pdv_sd = NULL;
543 return ret;
544 }
545 return 0;
546 }
547 spin_unlock_irq(sh->host_lock);
548
549 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
550 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
551
552 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
553 scsi_host_put(sh);
554 else if (legacy_mode_enable) {
555 pscsi_pmode_enable_hba(hba, 0);
556 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
557 }
558
559 return -ENODEV;
560 }
561
562 static void pscsi_free_device(struct se_device *dev)
563 {
564 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
565 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
566 struct scsi_device *sd = pdv->pdv_sd;
567
568 if (sd) {
569 /*
570 * Release exclusive pSCSI internal struct block_device claim for
571 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
572 */
573 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
574 blkdev_put(pdv->pdv_bd,
575 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
576 pdv->pdv_bd = NULL;
577 }
578 /*
579 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
580 * to struct Scsi_Host now.
581 */
582 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
583 (phv->phv_lld_host != NULL))
584 scsi_host_put(phv->phv_lld_host);
585 else if (pdv->pdv_lld_host)
586 scsi_host_put(pdv->pdv_lld_host);
587
588 scsi_device_put(sd);
589
590 pdv->pdv_sd = NULL;
591 }
592
593 kfree(pdv);
594 }
595
596 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
597 unsigned char *sense_buffer)
598 {
599 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
600 struct scsi_device *sd = pdv->pdv_sd;
601 int result;
602 struct pscsi_plugin_task *pt = cmd->priv;
603 unsigned char *cdb;
604 /*
605 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
606 * not been allocated because TCM is handling the emulation directly.
607 */
608 if (!pt)
609 return;
610
611 cdb = &pt->pscsi_cdb[0];
612 result = pt->pscsi_result;
613 /*
614 * Hack to make sure that Write-Protect modepage is set if R/O mode is
615 * forced.
616 */
617 if (!cmd->se_deve || !cmd->data_length)
618 goto after_mode_sense;
619
620 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
621 (status_byte(result) << 1) == SAM_STAT_GOOD) {
622 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
623 unsigned char *buf;
624
625 buf = transport_kmap_data_sg(cmd);
626 if (!buf)
627 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
628
629 if (cdb[0] == MODE_SENSE_10) {
630 if (!(buf[3] & 0x80))
631 buf[3] |= 0x80;
632 } else {
633 if (!(buf[2] & 0x80))
634 buf[2] |= 0x80;
635 }
636
637 transport_kunmap_data_sg(cmd);
638 }
639 }
640 after_mode_sense:
641
642 if (sd->type != TYPE_TAPE || !cmd->data_length)
643 goto after_mode_select;
644
645 /*
646 * Hack to correctly obtain the initiator requested blocksize for
647 * TYPE_TAPE. Since this value is dependent upon each tape media,
648 * struct scsi_device->sector_size will not contain the correct value
649 * by default, so we go ahead and set it so
650 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
651 * storage engine.
652 */
653 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
654 (status_byte(result) << 1) == SAM_STAT_GOOD) {
655 unsigned char *buf;
656 u16 bdl;
657 u32 blocksize;
658
659 buf = sg_virt(&sg[0]);
660 if (!buf) {
661 pr_err("Unable to get buf for scatterlist\n");
662 goto after_mode_select;
663 }
664
665 if (cdb[0] == MODE_SELECT)
666 bdl = (buf[3]);
667 else
668 bdl = (buf[6] << 8) | (buf[7]);
669
670 if (!bdl)
671 goto after_mode_select;
672
673 if (cdb[0] == MODE_SELECT)
674 blocksize = (buf[9] << 16) | (buf[10] << 8) |
675 (buf[11]);
676 else
677 blocksize = (buf[13] << 16) | (buf[14] << 8) |
678 (buf[15]);
679
680 sd->sector_size = blocksize;
681 }
682 after_mode_select:
683
684 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
685 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
686 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
687 }
688 }
689
690 enum {
691 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
692 Opt_scsi_lun_id, Opt_err
693 };
694
695 static match_table_t tokens = {
696 {Opt_scsi_host_id, "scsi_host_id=%d"},
697 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
698 {Opt_scsi_target_id, "scsi_target_id=%d"},
699 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
700 {Opt_err, NULL}
701 };
702
703 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
704 const char *page, ssize_t count)
705 {
706 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
707 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
708 char *orig, *ptr, *opts;
709 substring_t args[MAX_OPT_ARGS];
710 int ret = 0, arg, token;
711
712 opts = kstrdup(page, GFP_KERNEL);
713 if (!opts)
714 return -ENOMEM;
715
716 orig = opts;
717
718 while ((ptr = strsep(&opts, ",\n")) != NULL) {
719 if (!*ptr)
720 continue;
721
722 token = match_token(ptr, tokens, args);
723 switch (token) {
724 case Opt_scsi_host_id:
725 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
726 pr_err("PSCSI[%d]: Unable to accept"
727 " scsi_host_id while phv_mode =="
728 " PHV_LLD_SCSI_HOST_NO\n",
729 phv->phv_host_id);
730 ret = -EINVAL;
731 goto out;
732 }
733 match_int(args, &arg);
734 pdv->pdv_host_id = arg;
735 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
736 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
737 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
738 break;
739 case Opt_scsi_channel_id:
740 match_int(args, &arg);
741 pdv->pdv_channel_id = arg;
742 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
743 " ID: %d\n", phv->phv_host_id,
744 pdv->pdv_channel_id);
745 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
746 break;
747 case Opt_scsi_target_id:
748 match_int(args, &arg);
749 pdv->pdv_target_id = arg;
750 pr_debug("PSCSI[%d]: Referencing SCSI Target"
751 " ID: %d\n", phv->phv_host_id,
752 pdv->pdv_target_id);
753 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
754 break;
755 case Opt_scsi_lun_id:
756 match_int(args, &arg);
757 pdv->pdv_lun_id = arg;
758 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
759 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
760 pdv->pdv_flags |= PDF_HAS_LUN_ID;
761 break;
762 default:
763 break;
764 }
765 }
766
767 out:
768 kfree(orig);
769 return (!ret) ? count : ret;
770 }
771
772 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
773 {
774 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
775 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
776 struct scsi_device *sd = pdv->pdv_sd;
777 unsigned char host_id[16];
778 ssize_t bl;
779 int i;
780
781 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
782 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
783 else
784 snprintf(host_id, 16, "PHBA Mode");
785
786 bl = sprintf(b, "SCSI Device Bus Location:"
787 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
788 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
789 host_id);
790
791 if (sd) {
792 bl += sprintf(b + bl, " ");
793 bl += sprintf(b + bl, "Vendor: ");
794 for (i = 0; i < 8; i++) {
795 if (ISPRINT(sd->vendor[i])) /* printable character? */
796 bl += sprintf(b + bl, "%c", sd->vendor[i]);
797 else
798 bl += sprintf(b + bl, " ");
799 }
800 bl += sprintf(b + bl, " Model: ");
801 for (i = 0; i < 16; i++) {
802 if (ISPRINT(sd->model[i])) /* printable character ? */
803 bl += sprintf(b + bl, "%c", sd->model[i]);
804 else
805 bl += sprintf(b + bl, " ");
806 }
807 bl += sprintf(b + bl, " Rev: ");
808 for (i = 0; i < 4; i++) {
809 if (ISPRINT(sd->rev[i])) /* printable character ? */
810 bl += sprintf(b + bl, "%c", sd->rev[i]);
811 else
812 bl += sprintf(b + bl, " ");
813 }
814 bl += sprintf(b + bl, "\n");
815 }
816 return bl;
817 }
818
819 static void pscsi_bi_endio(struct bio *bio, int error)
820 {
821 bio_put(bio);
822 }
823
824 static inline struct bio *pscsi_get_bio(int nr_vecs)
825 {
826 struct bio *bio;
827 /*
828 * Use bio_malloc() following the comment in for bio -> struct request
829 * in block/blk-core.c:blk_make_request()
830 */
831 bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
832 if (!bio) {
833 pr_err("PSCSI: bio_kmalloc() failed\n");
834 return NULL;
835 }
836 bio->bi_end_io = pscsi_bi_endio;
837
838 return bio;
839 }
840
841 static sense_reason_t
842 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
843 enum dma_data_direction data_direction, struct bio **hbio)
844 {
845 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
846 struct bio *bio = NULL, *tbio = NULL;
847 struct page *page;
848 struct scatterlist *sg;
849 u32 data_len = cmd->data_length, i, len, bytes, off;
850 int nr_pages = (cmd->data_length + sgl[0].offset +
851 PAGE_SIZE - 1) >> PAGE_SHIFT;
852 int nr_vecs = 0, rc;
853 int rw = (data_direction == DMA_TO_DEVICE);
854
855 *hbio = NULL;
856
857 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
858
859 for_each_sg(sgl, sg, sgl_nents, i) {
860 page = sg_page(sg);
861 off = sg->offset;
862 len = sg->length;
863
864 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
865 page, len, off);
866
867 /*
868 * We only have one page of data in each sg element,
869 * we can not cross a page boundary.
870 */
871 if (off + len > PAGE_SIZE)
872 goto fail;
873
874 if (len > 0 && data_len > 0) {
875 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
876 bytes = min(bytes, data_len);
877
878 if (!bio) {
879 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
880 nr_pages -= nr_vecs;
881 /*
882 * Calls bio_kmalloc() and sets bio->bi_end_io()
883 */
884 bio = pscsi_get_bio(nr_vecs);
885 if (!bio)
886 goto fail;
887
888 if (rw)
889 bio->bi_rw |= REQ_WRITE;
890
891 pr_debug("PSCSI: Allocated bio: %p,"
892 " dir: %s nr_vecs: %d\n", bio,
893 (rw) ? "rw" : "r", nr_vecs);
894 /*
895 * Set *hbio pointer to handle the case:
896 * nr_pages > BIO_MAX_PAGES, where additional
897 * bios need to be added to complete a given
898 * command.
899 */
900 if (!*hbio)
901 *hbio = tbio = bio;
902 else
903 tbio = tbio->bi_next = bio;
904 }
905
906 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
907 " bio: %p page: %p len: %d off: %d\n", i, bio,
908 page, len, off);
909
910 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
911 bio, page, bytes, off);
912 if (rc != bytes)
913 goto fail;
914
915 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
916 bio->bi_vcnt, nr_vecs);
917
918 if (bio->bi_vcnt > nr_vecs) {
919 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
920 " %d i: %d bio: %p, allocating another"
921 " bio\n", bio->bi_vcnt, i, bio);
922 /*
923 * Clear the pointer so that another bio will
924 * be allocated with pscsi_get_bio() above, the
925 * current bio has already been set *tbio and
926 * bio->bi_next.
927 */
928 bio = NULL;
929 }
930
931 data_len -= bytes;
932 }
933 }
934
935 return 0;
936 fail:
937 while (*hbio) {
938 bio = *hbio;
939 *hbio = (*hbio)->bi_next;
940 bio_endio(bio, 0); /* XXX: should be error */
941 }
942 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
943 }
944
945 /*
946 * Clear a lun set in the cdb if the initiator talking to use spoke
947 * and old standards version, as we can't assume the underlying device
948 * won't choke up on it.
949 */
950 static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
951 {
952 switch (cdb[0]) {
953 case READ_10: /* SBC - RDProtect */
954 case READ_12: /* SBC - RDProtect */
955 case READ_16: /* SBC - RDProtect */
956 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
957 case VERIFY: /* SBC - VRProtect */
958 case VERIFY_16: /* SBC - VRProtect */
959 case WRITE_VERIFY: /* SBC - VRProtect */
960 case WRITE_VERIFY_12: /* SBC - VRProtect */
961 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
962 break;
963 default:
964 cdb[1] &= 0x1f; /* clear logical unit number */
965 break;
966 }
967 }
968
969 static sense_reason_t
970 pscsi_parse_cdb(struct se_cmd *cmd)
971 {
972 unsigned char *cdb = cmd->t_task_cdb;
973
974 if (cmd->se_cmd_flags & SCF_BIDI)
975 return TCM_UNSUPPORTED_SCSI_OPCODE;
976
977 pscsi_clear_cdb_lun(cdb);
978
979 /*
980 * For REPORT LUNS we always need to emulate the response, for everything
981 * else the default for pSCSI is to pass the command to the underlying
982 * LLD / physical hardware.
983 */
984 switch (cdb[0]) {
985 case REPORT_LUNS:
986 cmd->execute_cmd = spc_emulate_report_luns;
987 return 0;
988 case READ_6:
989 case READ_10:
990 case READ_12:
991 case READ_16:
992 case WRITE_6:
993 case WRITE_10:
994 case WRITE_12:
995 case WRITE_16:
996 case WRITE_VERIFY:
997 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
998 /* FALLTHROUGH*/
999 default:
1000 cmd->execute_cmd = pscsi_execute_cmd;
1001 return 0;
1002 }
1003 }
1004
1005 static sense_reason_t
1006 pscsi_execute_cmd(struct se_cmd *cmd)
1007 {
1008 struct scatterlist *sgl = cmd->t_data_sg;
1009 u32 sgl_nents = cmd->t_data_nents;
1010 enum dma_data_direction data_direction = cmd->data_direction;
1011 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
1012 struct pscsi_plugin_task *pt;
1013 struct request *req;
1014 struct bio *hbio;
1015 sense_reason_t ret;
1016
1017 /*
1018 * Dynamically alloc cdb space, since it may be larger than
1019 * TCM_MAX_COMMAND_SIZE
1020 */
1021 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1022 if (!pt) {
1023 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1024 }
1025 cmd->priv = pt;
1026
1027 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1028 scsi_command_size(cmd->t_task_cdb));
1029
1030 if (!sgl) {
1031 req = blk_get_request(pdv->pdv_sd->request_queue,
1032 (data_direction == DMA_TO_DEVICE),
1033 GFP_KERNEL);
1034 if (!req || IS_ERR(req)) {
1035 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1036 req ? IS_ERR(req) : -ENOMEM);
1037 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1038 goto fail;
1039 }
1040 } else {
1041 BUG_ON(!cmd->data_length);
1042
1043 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1044 if (ret)
1045 goto fail;
1046
1047 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1048 GFP_KERNEL);
1049 if (IS_ERR(req)) {
1050 pr_err("pSCSI: blk_make_request() failed\n");
1051 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1052 goto fail_free_bio;
1053 }
1054 }
1055
1056 req->cmd_type = REQ_TYPE_BLOCK_PC;
1057 req->end_io = pscsi_req_done;
1058 req->end_io_data = cmd;
1059 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1060 req->cmd = &pt->pscsi_cdb[0];
1061 req->sense = &pt->pscsi_sense[0];
1062 req->sense_len = 0;
1063 if (pdv->pdv_sd->type == TYPE_DISK)
1064 req->timeout = PS_TIMEOUT_DISK;
1065 else
1066 req->timeout = PS_TIMEOUT_OTHER;
1067 req->retries = PS_RETRY;
1068
1069 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1070 (cmd->sam_task_attr == MSG_HEAD_TAG),
1071 pscsi_req_done);
1072
1073 return 0;
1074
1075 fail_free_bio:
1076 while (hbio) {
1077 struct bio *bio = hbio;
1078 hbio = hbio->bi_next;
1079 bio_endio(bio, 0); /* XXX: should be error */
1080 }
1081 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1082 fail:
1083 kfree(pt);
1084 return ret;
1085 }
1086
1087 /* pscsi_get_device_type():
1088 *
1089 *
1090 */
1091 static u32 pscsi_get_device_type(struct se_device *dev)
1092 {
1093 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1094 struct scsi_device *sd = pdv->pdv_sd;
1095
1096 return (sd) ? sd->type : TYPE_NO_LUN;
1097 }
1098
1099 static sector_t pscsi_get_blocks(struct se_device *dev)
1100 {
1101 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
1102
1103 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1104 return pdv->pdv_bd->bd_part->nr_sects;
1105
1106 return 0;
1107 }
1108
1109 static void pscsi_req_done(struct request *req, int uptodate)
1110 {
1111 struct se_cmd *cmd = req->end_io_data;
1112 struct pscsi_plugin_task *pt = cmd->priv;
1113
1114 pt->pscsi_result = req->errors;
1115 pt->pscsi_resid = req->resid_len;
1116
1117 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1118 if (cmd->scsi_status) {
1119 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1120 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1121 pt->pscsi_result);
1122 }
1123
1124 switch (host_byte(pt->pscsi_result)) {
1125 case DID_OK:
1126 target_complete_cmd(cmd, cmd->scsi_status);
1127 break;
1128 default:
1129 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1130 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1131 pt->pscsi_result);
1132 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1133 break;
1134 }
1135
1136 __blk_put_request(req->q, req);
1137 kfree(pt);
1138 }
1139
1140 static struct se_subsystem_api pscsi_template = {
1141 .name = "pscsi",
1142 .owner = THIS_MODULE,
1143 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1144 .attach_hba = pscsi_attach_hba,
1145 .detach_hba = pscsi_detach_hba,
1146 .pmode_enable_hba = pscsi_pmode_enable_hba,
1147 .alloc_device = pscsi_alloc_device,
1148 .configure_device = pscsi_configure_device,
1149 .free_device = pscsi_free_device,
1150 .transport_complete = pscsi_transport_complete,
1151 .parse_cdb = pscsi_parse_cdb,
1152 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1153 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1154 .get_device_type = pscsi_get_device_type,
1155 .get_blocks = pscsi_get_blocks,
1156 };
1157
1158 static int __init pscsi_module_init(void)
1159 {
1160 return transport_subsystem_register(&pscsi_template);
1161 }
1162
1163 static void __exit pscsi_module_exit(void)
1164 {
1165 transport_subsystem_release(&pscsi_template);
1166 }
1167
1168 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1169 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1170 MODULE_LICENSE("GPL");
1171
1172 module_init(pscsi_module_init);
1173 module_exit(pscsi_module_exit);
kernel source for telekom puls (alcatel/mediatek)