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TTY: rfcomm/tty, use tty_port refcounting
[linux-2.6.git] / drivers / target / target_core_pscsi.c
blob94c905fcbceb39d665c2fdee4131176ee712464c
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_VIRTUAL_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 = 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_VIRTUAL_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 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
354 se_dev, dev_flags, pdv,
355 &dev_limits, NULL, NULL);
356 if (!dev) {
357 pdv->pdv_sd = NULL;
358 return NULL;
359 }
360
361 /*
362 * Locate VPD WWN Information used for various purposes within
363 * the Storage Engine.
364 */
365 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
366 /*
367 * If VPD Unit Serial returned GOOD status, try
368 * VPD Device Identification page (0x83).
369 */
370 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
371 }
372
373 /*
374 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
375 */
376 if (sd->type == TYPE_TAPE)
377 pscsi_tape_read_blocksize(dev, sd);
378 return dev;
379 }
380
381 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
382 {
383 struct pscsi_dev_virt *pdv;
384
385 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
386 if (!pdv) {
387 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
388 return NULL;
389 }
390 pdv->pdv_se_hba = hba;
391
392 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
393 return pdv;
394 }
395
396 /*
397 * Called with struct Scsi_Host->host_lock called.
398 */
399 static struct se_device *pscsi_create_type_disk(
400 struct scsi_device *sd,
401 struct pscsi_dev_virt *pdv,
402 struct se_subsystem_dev *se_dev,
403 struct se_hba *hba)
404 __releases(sh->host_lock)
405 {
406 struct se_device *dev;
407 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
408 struct Scsi_Host *sh = sd->host;
409 struct block_device *bd;
410 u32 dev_flags = 0;
411
412 if (scsi_device_get(sd)) {
413 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
414 sh->host_no, sd->channel, sd->id, sd->lun);
415 spin_unlock_irq(sh->host_lock);
416 return NULL;
417 }
418 spin_unlock_irq(sh->host_lock);
419 /*
420 * Claim exclusive struct block_device access to struct scsi_device
421 * for TYPE_DISK using supplied udev_path
422 */
423 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
424 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
425 if (IS_ERR(bd)) {
426 pr_err("pSCSI: blkdev_get_by_path() failed\n");
427 scsi_device_put(sd);
428 return NULL;
429 }
430 pdv->pdv_bd = bd;
431
432 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
433 if (!dev) {
434 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
435 scsi_device_put(sd);
436 return NULL;
437 }
438 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
439 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
440
441 return dev;
442 }
443
444 /*
445 * Called with struct Scsi_Host->host_lock called.
446 */
447 static struct se_device *pscsi_create_type_rom(
448 struct scsi_device *sd,
449 struct pscsi_dev_virt *pdv,
450 struct se_subsystem_dev *se_dev,
451 struct se_hba *hba)
452 __releases(sh->host_lock)
453 {
454 struct se_device *dev;
455 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
456 struct Scsi_Host *sh = sd->host;
457 u32 dev_flags = 0;
458
459 if (scsi_device_get(sd)) {
460 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
461 sh->host_no, sd->channel, sd->id, sd->lun);
462 spin_unlock_irq(sh->host_lock);
463 return NULL;
464 }
465 spin_unlock_irq(sh->host_lock);
466
467 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
468 if (!dev) {
469 scsi_device_put(sd);
470 return NULL;
471 }
472 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
473 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
474 sd->channel, sd->id, sd->lun);
475
476 return dev;
477 }
478
479 /*
480 *Called with struct Scsi_Host->host_lock called.
481 */
482 static struct se_device *pscsi_create_type_other(
483 struct scsi_device *sd,
484 struct pscsi_dev_virt *pdv,
485 struct se_subsystem_dev *se_dev,
486 struct se_hba *hba)
487 __releases(sh->host_lock)
488 {
489 struct se_device *dev;
490 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
491 struct Scsi_Host *sh = sd->host;
492 u32 dev_flags = 0;
493
494 spin_unlock_irq(sh->host_lock);
495 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
496 if (!dev)
497 return NULL;
498
499 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
500 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
501 sd->channel, sd->id, sd->lun);
502
503 return dev;
504 }
505
506 static struct se_device *pscsi_create_virtdevice(
507 struct se_hba *hba,
508 struct se_subsystem_dev *se_dev,
509 void *p)
510 {
511 struct pscsi_dev_virt *pdv = p;
512 struct se_device *dev;
513 struct scsi_device *sd;
514 struct pscsi_hba_virt *phv = hba->hba_ptr;
515 struct Scsi_Host *sh = phv->phv_lld_host;
516 int legacy_mode_enable = 0;
517
518 if (!pdv) {
519 pr_err("Unable to locate struct pscsi_dev_virt"
520 " parameter\n");
521 return ERR_PTR(-EINVAL);
522 }
523 /*
524 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
525 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
526 */
527 if (!sh) {
528 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
529 pr_err("pSCSI: Unable to locate struct"
530 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
531 return ERR_PTR(-ENODEV);
532 }
533 /*
534 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
535 * reference, we enforce that udev_path has been set
536 */
537 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
538 pr_err("pSCSI: udev_path attribute has not"
539 " been set before ENABLE=1\n");
540 return ERR_PTR(-EINVAL);
541 }
542 /*
543 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
544 * use the original TCM hba ID to reference Linux/SCSI Host No
545 * and enable for PHV_LLD_SCSI_HOST_NO mode.
546 */
547 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
548 spin_lock(&hba->device_lock);
549 if (!list_empty(&hba->hba_dev_list)) {
550 pr_err("pSCSI: Unable to set hba_mode"
551 " with active devices\n");
552 spin_unlock(&hba->device_lock);
553 return ERR_PTR(-EEXIST);
554 }
555 spin_unlock(&hba->device_lock);
556
557 if (pscsi_pmode_enable_hba(hba, 1) != 1)
558 return ERR_PTR(-ENODEV);
559
560 legacy_mode_enable = 1;
561 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
562 sh = phv->phv_lld_host;
563 } else {
564 sh = scsi_host_lookup(pdv->pdv_host_id);
565 if (IS_ERR(sh)) {
566 pr_err("pSCSI: Unable to locate"
567 " pdv_host_id: %d\n", pdv->pdv_host_id);
568 return ERR_CAST(sh);
569 }
570 }
571 } else {
572 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
573 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
574 " struct Scsi_Host exists\n");
575 return ERR_PTR(-EEXIST);
576 }
577 }
578
579 spin_lock_irq(sh->host_lock);
580 list_for_each_entry(sd, &sh->__devices, siblings) {
581 if ((pdv->pdv_channel_id != sd->channel) ||
582 (pdv->pdv_target_id != sd->id) ||
583 (pdv->pdv_lun_id != sd->lun))
584 continue;
585 /*
586 * Functions will release the held struct scsi_host->host_lock
587 * before calling calling pscsi_add_device_to_list() to register
588 * struct scsi_device with target_core_mod.
589 */
590 switch (sd->type) {
591 case TYPE_DISK:
592 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
593 break;
594 case TYPE_ROM:
595 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
596 break;
597 default:
598 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
599 break;
600 }
601
602 if (!dev) {
603 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
604 scsi_host_put(sh);
605 else if (legacy_mode_enable) {
606 pscsi_pmode_enable_hba(hba, 0);
607 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
608 }
609 pdv->pdv_sd = NULL;
610 return ERR_PTR(-ENODEV);
611 }
612 return dev;
613 }
614 spin_unlock_irq(sh->host_lock);
615
616 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
617 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
618
619 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
620 scsi_host_put(sh);
621 else if (legacy_mode_enable) {
622 pscsi_pmode_enable_hba(hba, 0);
623 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
624 }
625
626 return ERR_PTR(-ENODEV);
627 }
628
629 /* pscsi_free_device(): (Part of se_subsystem_api_t template)
630 *
631 *
632 */
633 static void pscsi_free_device(void *p)
634 {
635 struct pscsi_dev_virt *pdv = p;
636 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
637 struct scsi_device *sd = pdv->pdv_sd;
638
639 if (sd) {
640 /*
641 * Release exclusive pSCSI internal struct block_device claim for
642 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
643 */
644 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
645 blkdev_put(pdv->pdv_bd,
646 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
647 pdv->pdv_bd = NULL;
648 }
649 /*
650 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
651 * to struct Scsi_Host now.
652 */
653 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
654 (phv->phv_lld_host != NULL))
655 scsi_host_put(phv->phv_lld_host);
656
657 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
658 scsi_device_put(sd);
659
660 pdv->pdv_sd = NULL;
661 }
662
663 kfree(pdv);
664 }
665
666 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
667 {
668 return container_of(task, struct pscsi_plugin_task, pscsi_task);
669 }
670
671
672 /* pscsi_transport_complete():
673 *
674 *
675 */
676 static int pscsi_transport_complete(struct se_task *task)
677 {
678 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
679 struct scsi_device *sd = pdv->pdv_sd;
680 int result;
681 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
682 unsigned char *cdb = &pt->pscsi_cdb[0];
683
684 result = pt->pscsi_result;
685 /*
686 * Hack to make sure that Write-Protect modepage is set if R/O mode is
687 * forced.
688 */
689 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
690 (status_byte(result) << 1) == SAM_STAT_GOOD) {
691 if (!task->task_se_cmd->se_deve)
692 goto after_mode_sense;
693
694 if (task->task_se_cmd->se_deve->lun_flags &
695 TRANSPORT_LUNFLAGS_READ_ONLY) {
696 unsigned char *buf = transport_kmap_data_sg(task->task_se_cmd);
697
698 if (cdb[0] == MODE_SENSE_10) {
699 if (!(buf[3] & 0x80))
700 buf[3] |= 0x80;
701 } else {
702 if (!(buf[2] & 0x80))
703 buf[2] |= 0x80;
704 }
705
706 transport_kunmap_data_sg(task->task_se_cmd);
707 }
708 }
709 after_mode_sense:
710
711 if (sd->type != TYPE_TAPE)
712 goto after_mode_select;
713
714 /*
715 * Hack to correctly obtain the initiator requested blocksize for
716 * TYPE_TAPE. Since this value is dependent upon each tape media,
717 * struct scsi_device->sector_size will not contain the correct value
718 * by default, so we go ahead and set it so
719 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
720 * storage engine.
721 */
722 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
723 (status_byte(result) << 1) == SAM_STAT_GOOD) {
724 unsigned char *buf;
725 struct scatterlist *sg = task->task_sg;
726 u16 bdl;
727 u32 blocksize;
728
729 buf = sg_virt(&sg[0]);
730 if (!buf) {
731 pr_err("Unable to get buf for scatterlist\n");
732 goto after_mode_select;
733 }
734
735 if (cdb[0] == MODE_SELECT)
736 bdl = (buf[3]);
737 else
738 bdl = (buf[6] << 8) | (buf[7]);
739
740 if (!bdl)
741 goto after_mode_select;
742
743 if (cdb[0] == MODE_SELECT)
744 blocksize = (buf[9] << 16) | (buf[10] << 8) |
745 (buf[11]);
746 else
747 blocksize = (buf[13] << 16) | (buf[14] << 8) |
748 (buf[15]);
749
750 sd->sector_size = blocksize;
751 }
752 after_mode_select:
753
754 if (status_byte(result) & CHECK_CONDITION)
755 return 1;
756
757 return 0;
758 }
759
760 static struct se_task *
761 pscsi_alloc_task(unsigned char *cdb)
762 {
763 struct pscsi_plugin_task *pt;
764
765 /*
766 * Dynamically alloc cdb space, since it may be larger than
767 * TCM_MAX_COMMAND_SIZE
768 */
769 pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL);
770 if (!pt) {
771 pr_err("Unable to allocate struct pscsi_plugin_task\n");
772 return NULL;
773 }
774
775 return &pt->pscsi_task;
776 }
777
778 static void pscsi_free_task(struct se_task *task)
779 {
780 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
781
782 /*
783 * We do not release the bio(s) here associated with this task, as
784 * this is handled by bio_put() and pscsi_bi_endio().
785 */
786 kfree(pt);
787 }
788
789 enum {
790 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
791 Opt_scsi_lun_id, Opt_err
792 };
793
794 static match_table_t tokens = {
795 {Opt_scsi_host_id, "scsi_host_id=%d"},
796 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
797 {Opt_scsi_target_id, "scsi_target_id=%d"},
798 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
799 {Opt_err, NULL}
800 };
801
802 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
803 struct se_subsystem_dev *se_dev,
804 const char *page,
805 ssize_t count)
806 {
807 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
808 struct pscsi_hba_virt *phv = hba->hba_ptr;
809 char *orig, *ptr, *opts;
810 substring_t args[MAX_OPT_ARGS];
811 int ret = 0, arg, token;
812
813 opts = kstrdup(page, GFP_KERNEL);
814 if (!opts)
815 return -ENOMEM;
816
817 orig = opts;
818
819 while ((ptr = strsep(&opts, ",\n")) != NULL) {
820 if (!*ptr)
821 continue;
822
823 token = match_token(ptr, tokens, args);
824 switch (token) {
825 case Opt_scsi_host_id:
826 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
827 pr_err("PSCSI[%d]: Unable to accept"
828 " scsi_host_id while phv_mode =="
829 " PHV_LLD_SCSI_HOST_NO\n",
830 phv->phv_host_id);
831 ret = -EINVAL;
832 goto out;
833 }
834 match_int(args, &arg);
835 pdv->pdv_host_id = arg;
836 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
837 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
838 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
839 break;
840 case Opt_scsi_channel_id:
841 match_int(args, &arg);
842 pdv->pdv_channel_id = arg;
843 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
844 " ID: %d\n", phv->phv_host_id,
845 pdv->pdv_channel_id);
846 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
847 break;
848 case Opt_scsi_target_id:
849 match_int(args, &arg);
850 pdv->pdv_target_id = arg;
851 pr_debug("PSCSI[%d]: Referencing SCSI Target"
852 " ID: %d\n", phv->phv_host_id,
853 pdv->pdv_target_id);
854 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
855 break;
856 case Opt_scsi_lun_id:
857 match_int(args, &arg);
858 pdv->pdv_lun_id = arg;
859 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
860 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
861 pdv->pdv_flags |= PDF_HAS_LUN_ID;
862 break;
863 default:
864 break;
865 }
866 }
867
868 out:
869 kfree(orig);
870 return (!ret) ? count : ret;
871 }
872
873 static ssize_t pscsi_check_configfs_dev_params(
874 struct se_hba *hba,
875 struct se_subsystem_dev *se_dev)
876 {
877 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
878
879 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
880 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
881 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
882 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
883 " scsi_lun_id= parameters\n");
884 return -EINVAL;
885 }
886
887 return 0;
888 }
889
890 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
891 struct se_subsystem_dev *se_dev,
892 char *b)
893 {
894 struct pscsi_hba_virt *phv = hba->hba_ptr;
895 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
896 struct scsi_device *sd = pdv->pdv_sd;
897 unsigned char host_id[16];
898 ssize_t bl;
899 int i;
900
901 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
902 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
903 else
904 snprintf(host_id, 16, "PHBA Mode");
905
906 bl = sprintf(b, "SCSI Device Bus Location:"
907 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
908 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
909 host_id);
910
911 if (sd) {
912 bl += sprintf(b + bl, " ");
913 bl += sprintf(b + bl, "Vendor: ");
914 for (i = 0; i < 8; i++) {
915 if (ISPRINT(sd->vendor[i])) /* printable character? */
916 bl += sprintf(b + bl, "%c", sd->vendor[i]);
917 else
918 bl += sprintf(b + bl, " ");
919 }
920 bl += sprintf(b + bl, " Model: ");
921 for (i = 0; i < 16; i++) {
922 if (ISPRINT(sd->model[i])) /* printable character ? */
923 bl += sprintf(b + bl, "%c", sd->model[i]);
924 else
925 bl += sprintf(b + bl, " ");
926 }
927 bl += sprintf(b + bl, " Rev: ");
928 for (i = 0; i < 4; i++) {
929 if (ISPRINT(sd->rev[i])) /* printable character ? */
930 bl += sprintf(b + bl, "%c", sd->rev[i]);
931 else
932 bl += sprintf(b + bl, " ");
933 }
934 bl += sprintf(b + bl, "\n");
935 }
936 return bl;
937 }
938
939 static void pscsi_bi_endio(struct bio *bio, int error)
940 {
941 bio_put(bio);
942 }
943
944 static inline struct bio *pscsi_get_bio(int sg_num)
945 {
946 struct bio *bio;
947 /*
948 * Use bio_malloc() following the comment in for bio -> struct request
949 * in block/blk-core.c:blk_make_request()
950 */
951 bio = bio_kmalloc(GFP_KERNEL, sg_num);
952 if (!bio) {
953 pr_err("PSCSI: bio_kmalloc() failed\n");
954 return NULL;
955 }
956 bio->bi_end_io = pscsi_bi_endio;
957
958 return bio;
959 }
960
961 static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg,
962 struct bio **hbio)
963 {
964 struct se_cmd *cmd = task->task_se_cmd;
965 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
966 u32 task_sg_num = task->task_sg_nents;
967 struct bio *bio = NULL, *tbio = NULL;
968 struct page *page;
969 struct scatterlist *sg;
970 u32 data_len = task->task_size, i, len, bytes, off;
971 int nr_pages = (task->task_size + task_sg[0].offset +
972 PAGE_SIZE - 1) >> PAGE_SHIFT;
973 int nr_vecs = 0, rc;
974 int rw = (task->task_data_direction == DMA_TO_DEVICE);
975
976 *hbio = NULL;
977
978 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
979
980 for_each_sg(task_sg, sg, task_sg_num, i) {
981 page = sg_page(sg);
982 off = sg->offset;
983 len = sg->length;
984
985 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
986 page, len, off);
987
988 while (len > 0 && data_len > 0) {
989 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
990 bytes = min(bytes, data_len);
991
992 if (!bio) {
993 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
994 nr_pages -= nr_vecs;
995 /*
996 * Calls bio_kmalloc() and sets bio->bi_end_io()
997 */
998 bio = pscsi_get_bio(nr_vecs);
999 if (!bio)
1000 goto fail;
1001
1002 if (rw)
1003 bio->bi_rw |= REQ_WRITE;
1004
1005 pr_debug("PSCSI: Allocated bio: %p,"
1006 " dir: %s nr_vecs: %d\n", bio,
1007 (rw) ? "rw" : "r", nr_vecs);
1008 /*
1009 * Set *hbio pointer to handle the case:
1010 * nr_pages > BIO_MAX_PAGES, where additional
1011 * bios need to be added to complete a given
1012 * struct se_task
1013 */
1014 if (!*hbio)
1015 *hbio = tbio = bio;
1016 else
1017 tbio = tbio->bi_next = bio;
1018 }
1019
1020 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
1021 " bio: %p page: %p len: %d off: %d\n", i, bio,
1022 page, len, off);
1023
1024 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1025 bio, page, bytes, off);
1026 if (rc != bytes)
1027 goto fail;
1028
1029 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1030 bio->bi_vcnt, nr_vecs);
1031
1032 if (bio->bi_vcnt > nr_vecs) {
1033 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1034 " %d i: %d bio: %p, allocating another"
1035 " bio\n", bio->bi_vcnt, i, bio);
1036 /*
1037 * Clear the pointer so that another bio will
1038 * be allocated with pscsi_get_bio() above, the
1039 * current bio has already been set *tbio and
1040 * bio->bi_next.
1041 */
1042 bio = NULL;
1043 }
1044
1045 page++;
1046 len -= bytes;
1047 data_len -= bytes;
1048 off = 0;
1049 }
1050 }
1051
1052 return task->task_sg_nents;
1053 fail:
1054 while (*hbio) {
1055 bio = *hbio;
1056 *hbio = (*hbio)->bi_next;
1057 bio->bi_next = NULL;
1058 bio_endio(bio, 0); /* XXX: should be error */
1059 }
1060 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1061 return -ENOMEM;
1062 }
1063
1064 static int pscsi_do_task(struct se_task *task)
1065 {
1066 struct se_cmd *cmd = task->task_se_cmd;
1067 struct pscsi_dev_virt *pdv = task->task_se_cmd->se_dev->dev_ptr;
1068 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1069 struct request *req;
1070 struct bio *hbio;
1071 int ret;
1072
1073 target_get_task_cdb(task, pt->pscsi_cdb);
1074
1075 if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
1076 req = blk_get_request(pdv->pdv_sd->request_queue,
1077 (task->task_data_direction == DMA_TO_DEVICE),
1078 GFP_KERNEL);
1079 if (!req || IS_ERR(req)) {
1080 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1081 req ? IS_ERR(req) : -ENOMEM);
1082 cmd->scsi_sense_reason =
1083 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1084 return -ENODEV;
1085 }
1086 } else {
1087 BUG_ON(!task->task_size);
1088
1089 /*
1090 * Setup the main struct request for the task->task_sg[] payload
1091 */
1092 ret = pscsi_map_sg(task, task->task_sg, &hbio);
1093 if (ret < 0) {
1094 cmd->scsi_sense_reason =
1095 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1096 return ret;
1097 }
1098
1099 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1100 GFP_KERNEL);
1101 if (IS_ERR(req)) {
1102 pr_err("pSCSI: blk_make_request() failed\n");
1103 goto fail;
1104 }
1105 }
1106
1107 req->cmd_type = REQ_TYPE_BLOCK_PC;
1108 req->end_io = pscsi_req_done;
1109 req->end_io_data = task;
1110 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1111 req->cmd = &pt->pscsi_cdb[0];
1112 req->sense = &pt->pscsi_sense[0];
1113 req->sense_len = 0;
1114 if (pdv->pdv_sd->type == TYPE_DISK)
1115 req->timeout = PS_TIMEOUT_DISK;
1116 else
1117 req->timeout = PS_TIMEOUT_OTHER;
1118 req->retries = PS_RETRY;
1119
1120 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1121 (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
1122 pscsi_req_done);
1123
1124 return 0;
1125
1126 fail:
1127 while (hbio) {
1128 struct bio *bio = hbio;
1129 hbio = hbio->bi_next;
1130 bio->bi_next = NULL;
1131 bio_endio(bio, 0); /* XXX: should be error */
1132 }
1133 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1134 return -ENOMEM;
1135 }
1136
1137 /* pscsi_get_sense_buffer():
1138 *
1139 *
1140 */
1141 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1142 {
1143 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1144
1145 return pt->pscsi_sense;
1146 }
1147
1148 /* pscsi_get_device_rev():
1149 *
1150 *
1151 */
1152 static u32 pscsi_get_device_rev(struct se_device *dev)
1153 {
1154 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1155 struct scsi_device *sd = pdv->pdv_sd;
1156
1157 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1158 }
1159
1160 /* pscsi_get_device_type():
1161 *
1162 *
1163 */
1164 static u32 pscsi_get_device_type(struct se_device *dev)
1165 {
1166 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1167 struct scsi_device *sd = pdv->pdv_sd;
1168
1169 return sd->type;
1170 }
1171
1172 static sector_t pscsi_get_blocks(struct se_device *dev)
1173 {
1174 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1175
1176 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1177 return pdv->pdv_bd->bd_part->nr_sects;
1178
1179 dump_stack();
1180 return 0;
1181 }
1182
1183 /* pscsi_handle_SAM_STATUS_failures():
1184 *
1185 *
1186 */
1187 static inline void pscsi_process_SAM_status(
1188 struct se_task *task,
1189 struct pscsi_plugin_task *pt)
1190 {
1191 task->task_scsi_status = status_byte(pt->pscsi_result);
1192 if (task->task_scsi_status) {
1193 task->task_scsi_status <<= 1;
1194 pr_debug("PSCSI Status Byte exception at task: %p CDB:"
1195 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1196 pt->pscsi_result);
1197 }
1198
1199 switch (host_byte(pt->pscsi_result)) {
1200 case DID_OK:
1201 transport_complete_task(task, (!task->task_scsi_status));
1202 break;
1203 default:
1204 pr_debug("PSCSI Host Byte exception at task: %p CDB:"
1205 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1206 pt->pscsi_result);
1207 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1208 task->task_se_cmd->scsi_sense_reason =
1209 TCM_UNSUPPORTED_SCSI_OPCODE;
1210 transport_complete_task(task, 0);
1211 break;
1212 }
1213 }
1214
1215 static void pscsi_req_done(struct request *req, int uptodate)
1216 {
1217 struct se_task *task = req->end_io_data;
1218 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1219
1220 pt->pscsi_result = req->errors;
1221 pt->pscsi_resid = req->resid_len;
1222
1223 pscsi_process_SAM_status(task, pt);
1224 __blk_put_request(req->q, req);
1225 }
1226
1227 static struct se_subsystem_api pscsi_template = {
1228 .name = "pscsi",
1229 .owner = THIS_MODULE,
1230 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1231 .attach_hba = pscsi_attach_hba,
1232 .detach_hba = pscsi_detach_hba,
1233 .pmode_enable_hba = pscsi_pmode_enable_hba,
1234 .allocate_virtdevice = pscsi_allocate_virtdevice,
1235 .create_virtdevice = pscsi_create_virtdevice,
1236 .free_device = pscsi_free_device,
1237 .transport_complete = pscsi_transport_complete,
1238 .alloc_task = pscsi_alloc_task,
1239 .do_task = pscsi_do_task,
1240 .free_task = pscsi_free_task,
1241 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1242 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1243 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1244 .get_sense_buffer = pscsi_get_sense_buffer,
1245 .get_device_rev = pscsi_get_device_rev,
1246 .get_device_type = pscsi_get_device_type,
1247 .get_blocks = pscsi_get_blocks,
1248 };
1249
1250 static int __init pscsi_module_init(void)
1251 {
1252 return transport_subsystem_register(&pscsi_template);
1253 }
1254
1255 static void pscsi_module_exit(void)
1256 {
1257 transport_subsystem_release(&pscsi_template);
1258 }
1259
1260 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1261 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1262 MODULE_LICENSE("GPL");
1263
1264 module_init(pscsi_module_init);
1265 module_exit(pscsi_module_exit);
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