/drivers/target/target_core_pscsi.c
C | 1473 lines | 1010 code | 183 blank | 280 comment | 156 complexity | 42c87c8ac743be62415c9985daab7aa4 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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/version.h>
30#include <linux/string.h>
31#include <linux/parser.h>
32#include <linux/timer.h>
33#include <linux/blkdev.h>
34#include <linux/blk_types.h>
35#include <linux/slab.h>
36#include <linux/spinlock.h>
37#include <linux/genhd.h>
38#include <linux/cdrom.h>
39#include <linux/file.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_device.h>
48#include <target/target_core_transport.h>
49
50#include "target_core_pscsi.h"
51
52#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
53
54static struct se_subsystem_api pscsi_template;
55
56static void pscsi_req_done(struct request *, int);
57
58/* pscsi_get_sh():
59 *
60 *
61 */
62static struct Scsi_Host *pscsi_get_sh(u32 host_no)
63{
64 struct Scsi_Host *sh = NULL;
65
66 sh = scsi_host_lookup(host_no);
67 if (IS_ERR(sh)) {
68 printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:"
69 " %u\n", host_no);
70 return NULL;
71 }
72
73 return sh;
74}
75
76/* pscsi_attach_hba():
77 *
78 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
79 * from the passed SCSI Host ID.
80 */
81static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
82{
83 int hba_depth;
84 struct pscsi_hba_virt *phv;
85
86 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
87 if (!(phv)) {
88 printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n");
89 return -1;
90 }
91 phv->phv_host_id = host_id;
92 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
93 hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
94 atomic_set(&hba->left_queue_depth, hba_depth);
95 atomic_set(&hba->max_queue_depth, hba_depth);
96
97 hba->hba_ptr = (void *)phv;
98
99 printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
100 " Generic Target Core Stack %s\n", hba->hba_id,
101 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
102 printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic"
103 " Target Core with TCQ Depth: %d\n", hba->hba_id,
104 atomic_read(&hba->max_queue_depth));
105
106 return 0;
107}
108
109static void pscsi_detach_hba(struct se_hba *hba)
110{
111 struct pscsi_hba_virt *phv = hba->hba_ptr;
112 struct Scsi_Host *scsi_host = phv->phv_lld_host;
113
114 if (scsi_host) {
115 scsi_host_put(scsi_host);
116
117 printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from"
118 " Generic Target Core\n", hba->hba_id,
119 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
120 "Unknown");
121 } else
122 printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA"
123 " from Generic Target Core\n", hba->hba_id);
124
125 kfree(phv);
126 hba->hba_ptr = NULL;
127}
128
129static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
130{
131 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
132 struct Scsi_Host *sh = phv->phv_lld_host;
133 int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
134 /*
135 * Release the struct Scsi_Host
136 */
137 if (!(mode_flag)) {
138 if (!(sh))
139 return 0;
140
141 phv->phv_lld_host = NULL;
142 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
143 atomic_set(&hba->left_queue_depth, hba_depth);
144 atomic_set(&hba->max_queue_depth, hba_depth);
145
146 printk(KERN_INFO "CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
147 " %s\n", hba->hba_id, (sh->hostt->name) ?
148 (sh->hostt->name) : "Unknown");
149
150 scsi_host_put(sh);
151 return 0;
152 }
153 /*
154 * Otherwise, locate struct Scsi_Host from the original passed
155 * pSCSI Host ID and enable for phba mode
156 */
157 sh = pscsi_get_sh(phv->phv_host_id);
158 if (!(sh)) {
159 printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for"
160 " phv_host_id: %d\n", phv->phv_host_id);
161 return -1;
162 }
163 /*
164 * Usually the SCSI LLD will use the hostt->can_queue value to define
165 * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set
166 * this at all and set sh->can_queue at runtime.
167 */
168 hba_depth = (sh->hostt->can_queue > sh->can_queue) ?
169 sh->hostt->can_queue : sh->can_queue;
170
171 atomic_set(&hba->left_queue_depth, hba_depth);
172 atomic_set(&hba->max_queue_depth, hba_depth);
173
174 phv->phv_lld_host = sh;
175 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
176
177 printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
178 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
179
180 return 1;
181}
182
183static void pscsi_tape_read_blocksize(struct se_device *dev,
184 struct scsi_device *sdev)
185{
186 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
187 int ret;
188
189 buf = kzalloc(12, GFP_KERNEL);
190 if (!buf)
191 return;
192
193 memset(cdb, 0, MAX_COMMAND_SIZE);
194 cdb[0] = MODE_SENSE;
195 cdb[4] = 0x0c; /* 12 bytes */
196
197 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
198 HZ, 1, NULL);
199 if (ret)
200 goto out_free;
201
202 /*
203 * If MODE_SENSE still returns zero, set the default value to 1024.
204 */
205 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
206 if (!sdev->sector_size)
207 sdev->sector_size = 1024;
208out_free:
209 kfree(buf);
210}
211
212static void
213pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
214{
215 unsigned char *buf;
216
217 if (sdev->inquiry_len < INQUIRY_LEN)
218 return;
219
220 buf = sdev->inquiry;
221 if (!buf)
222 return;
223 /*
224 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
225 */
226 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
227 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
228 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
229}
230
231static int
232pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
233{
234 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
235 int ret;
236
237 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
238 if (!buf)
239 return -1;
240
241 memset(cdb, 0, MAX_COMMAND_SIZE);
242 cdb[0] = INQUIRY;
243 cdb[1] = 0x01; /* Query VPD */
244 cdb[2] = 0x80; /* Unit Serial Number */
245 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
246 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
247
248 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
249 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
250 if (ret)
251 goto out_free;
252
253 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
254
255 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
256
257 kfree(buf);
258 return 0;
259
260out_free:
261 kfree(buf);
262 return -1;
263}
264
265static void
266pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
267 struct t10_wwn *wwn)
268{
269 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
270 int ident_len, page_len, off = 4, ret;
271 struct t10_vpd *vpd;
272
273 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
274 if (!buf)
275 return;
276
277 memset(cdb, 0, MAX_COMMAND_SIZE);
278 cdb[0] = INQUIRY;
279 cdb[1] = 0x01; /* Query VPD */
280 cdb[2] = 0x83; /* Device Identifier */
281 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
282 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
283
284 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
285 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
286 NULL, HZ, 1, NULL);
287 if (ret)
288 goto out;
289
290 page_len = (buf[2] << 8) | buf[3];
291 while (page_len > 0) {
292 /* Grab a pointer to the Identification descriptor */
293 page_83 = &buf[off];
294 ident_len = page_83[3];
295 if (!ident_len) {
296 printk(KERN_ERR "page_83[3]: identifier"
297 " length zero!\n");
298 break;
299 }
300 printk(KERN_INFO "T10 VPD Identifer Length: %d\n", ident_len);
301
302 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
303 if (!vpd) {
304 printk(KERN_ERR "Unable to allocate memory for"
305 " struct t10_vpd\n");
306 goto out;
307 }
308 INIT_LIST_HEAD(&vpd->vpd_list);
309
310 transport_set_vpd_proto_id(vpd, page_83);
311 transport_set_vpd_assoc(vpd, page_83);
312
313 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
314 off += (ident_len + 4);
315 page_len -= (ident_len + 4);
316 kfree(vpd);
317 continue;
318 }
319 if (transport_set_vpd_ident(vpd, page_83) < 0) {
320 off += (ident_len + 4);
321 page_len -= (ident_len + 4);
322 kfree(vpd);
323 continue;
324 }
325
326 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
327 off += (ident_len + 4);
328 page_len -= (ident_len + 4);
329 }
330
331out:
332 kfree(buf);
333}
334
335/* pscsi_add_device_to_list():
336 *
337 *
338 */
339static struct se_device *pscsi_add_device_to_list(
340 struct se_hba *hba,
341 struct se_subsystem_dev *se_dev,
342 struct pscsi_dev_virt *pdv,
343 struct scsi_device *sd,
344 int dev_flags)
345{
346 struct se_device *dev;
347 struct se_dev_limits dev_limits;
348 struct request_queue *q;
349 struct queue_limits *limits;
350
351 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
352
353 if (!sd->queue_depth) {
354 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
355
356 printk(KERN_ERR "Set broken SCSI Device %d:%d:%d"
357 " queue_depth to %d\n", sd->channel, sd->id,
358 sd->lun, sd->queue_depth);
359 }
360 /*
361 * Setup the local scope queue_limits from struct request_queue->limits
362 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
363 */
364 q = sd->request_queue;
365 limits = &dev_limits.limits;
366 limits->logical_block_size = sd->sector_size;
367 limits->max_hw_sectors = (sd->host->max_sectors > queue_max_hw_sectors(q)) ?
368 queue_max_hw_sectors(q) : sd->host->max_sectors;
369 limits->max_sectors = (sd->host->max_sectors > queue_max_sectors(q)) ?
370 queue_max_sectors(q) : sd->host->max_sectors;
371 dev_limits.hw_queue_depth = sd->queue_depth;
372 dev_limits.queue_depth = sd->queue_depth;
373 /*
374 * Setup our standard INQUIRY info into se_dev->t10_wwn
375 */
376 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
377
378 /*
379 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
380 * which has already been referenced with Linux SCSI code with
381 * scsi_device_get() in this file's pscsi_create_virtdevice().
382 *
383 * The passthrough operations called by the transport_add_device_*
384 * function below will require this pointer to be set for passthroug
385 * ops.
386 *
387 * For the shutdown case in pscsi_free_device(), this struct
388 * scsi_device reference is released with Linux SCSI code
389 * scsi_device_put() and the pdv->pdv_sd cleared.
390 */
391 pdv->pdv_sd = sd;
392
393 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
394 se_dev, dev_flags, (void *)pdv,
395 &dev_limits, NULL, NULL);
396 if (!(dev)) {
397 pdv->pdv_sd = NULL;
398 return NULL;
399 }
400
401 /*
402 * Locate VPD WWN Information used for various purposes within
403 * the Storage Engine.
404 */
405 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
406 /*
407 * If VPD Unit Serial returned GOOD status, try
408 * VPD Device Identification page (0x83).
409 */
410 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
411 }
412
413 /*
414 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
415 */
416 if (sd->type == TYPE_TAPE)
417 pscsi_tape_read_blocksize(dev, sd);
418 return dev;
419}
420
421static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
422{
423 struct pscsi_dev_virt *pdv;
424
425 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
426 if (!(pdv)) {
427 printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n");
428 return NULL;
429 }
430 pdv->pdv_se_hba = hba;
431
432 printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name);
433 return (void *)pdv;
434}
435
436/*
437 * Called with struct Scsi_Host->host_lock called.
438 */
439static struct se_device *pscsi_create_type_disk(
440 struct scsi_device *sd,
441 struct pscsi_dev_virt *pdv,
442 struct se_subsystem_dev *se_dev,
443 struct se_hba *hba)
444 __releases(sh->host_lock)
445{
446 struct se_device *dev;
447 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
448 struct Scsi_Host *sh = sd->host;
449 struct block_device *bd;
450 u32 dev_flags = 0;
451
452 if (scsi_device_get(sd)) {
453 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
454 sh->host_no, sd->channel, sd->id, sd->lun);
455 spin_unlock_irq(sh->host_lock);
456 return NULL;
457 }
458 spin_unlock_irq(sh->host_lock);
459 /*
460 * Claim exclusive struct block_device access to struct scsi_device
461 * for TYPE_DISK using supplied udev_path
462 */
463 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
464 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
465 if (IS_ERR(bd)) {
466 printk(KERN_ERR "pSCSI: blkdev_get_by_path() failed\n");
467 scsi_device_put(sd);
468 return NULL;
469 }
470 pdv->pdv_bd = bd;
471
472 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
473 if (!(dev)) {
474 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
475 scsi_device_put(sd);
476 return NULL;
477 }
478 printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
479 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
480
481 return dev;
482}
483
484/*
485 * Called with struct Scsi_Host->host_lock called.
486 */
487static struct se_device *pscsi_create_type_rom(
488 struct scsi_device *sd,
489 struct pscsi_dev_virt *pdv,
490 struct se_subsystem_dev *se_dev,
491 struct se_hba *hba)
492 __releases(sh->host_lock)
493{
494 struct se_device *dev;
495 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
496 struct Scsi_Host *sh = sd->host;
497 u32 dev_flags = 0;
498
499 if (scsi_device_get(sd)) {
500 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
501 sh->host_no, sd->channel, sd->id, sd->lun);
502 spin_unlock_irq(sh->host_lock);
503 return NULL;
504 }
505 spin_unlock_irq(sh->host_lock);
506
507 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
508 if (!(dev)) {
509 scsi_device_put(sd);
510 return NULL;
511 }
512 printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
513 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
514 sd->channel, sd->id, sd->lun);
515
516 return dev;
517}
518
519/*
520 *Called with struct Scsi_Host->host_lock called.
521 */
522static struct se_device *pscsi_create_type_other(
523 struct scsi_device *sd,
524 struct pscsi_dev_virt *pdv,
525 struct se_subsystem_dev *se_dev,
526 struct se_hba *hba)
527 __releases(sh->host_lock)
528{
529 struct se_device *dev;
530 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
531 struct Scsi_Host *sh = sd->host;
532 u32 dev_flags = 0;
533
534 spin_unlock_irq(sh->host_lock);
535 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
536 if (!(dev))
537 return NULL;
538
539 printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
540 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
541 sd->channel, sd->id, sd->lun);
542
543 return dev;
544}
545
546static struct se_device *pscsi_create_virtdevice(
547 struct se_hba *hba,
548 struct se_subsystem_dev *se_dev,
549 void *p)
550{
551 struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
552 struct se_device *dev;
553 struct scsi_device *sd;
554 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
555 struct Scsi_Host *sh = phv->phv_lld_host;
556 int legacy_mode_enable = 0;
557
558 if (!(pdv)) {
559 printk(KERN_ERR "Unable to locate struct pscsi_dev_virt"
560 " parameter\n");
561 return ERR_PTR(-EINVAL);
562 }
563 /*
564 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
565 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
566 */
567 if (!(sh)) {
568 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
569 printk(KERN_ERR "pSCSI: Unable to locate struct"
570 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
571 return ERR_PTR(-ENODEV);
572 }
573 /*
574 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
575 * reference, we enforce that udev_path has been set
576 */
577 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
578 printk(KERN_ERR "pSCSI: udev_path attribute has not"
579 " been set before ENABLE=1\n");
580 return ERR_PTR(-EINVAL);
581 }
582 /*
583 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
584 * use the original TCM hba ID to reference Linux/SCSI Host No
585 * and enable for PHV_LLD_SCSI_HOST_NO mode.
586 */
587 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
588 spin_lock(&hba->device_lock);
589 if (!(list_empty(&hba->hba_dev_list))) {
590 printk(KERN_ERR "pSCSI: Unable to set hba_mode"
591 " with active devices\n");
592 spin_unlock(&hba->device_lock);
593 return ERR_PTR(-EEXIST);
594 }
595 spin_unlock(&hba->device_lock);
596
597 if (pscsi_pmode_enable_hba(hba, 1) != 1)
598 return ERR_PTR(-ENODEV);
599
600 legacy_mode_enable = 1;
601 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
602 sh = phv->phv_lld_host;
603 } else {
604 sh = pscsi_get_sh(pdv->pdv_host_id);
605 if (!(sh)) {
606 printk(KERN_ERR "pSCSI: Unable to locate"
607 " pdv_host_id: %d\n", pdv->pdv_host_id);
608 return ERR_PTR(-ENODEV);
609 }
610 }
611 } else {
612 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
613 printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while"
614 " struct Scsi_Host exists\n");
615 return ERR_PTR(-EEXIST);
616 }
617 }
618
619 spin_lock_irq(sh->host_lock);
620 list_for_each_entry(sd, &sh->__devices, siblings) {
621 if ((pdv->pdv_channel_id != sd->channel) ||
622 (pdv->pdv_target_id != sd->id) ||
623 (pdv->pdv_lun_id != sd->lun))
624 continue;
625 /*
626 * Functions will release the held struct scsi_host->host_lock
627 * before calling calling pscsi_add_device_to_list() to register
628 * struct scsi_device with target_core_mod.
629 */
630 switch (sd->type) {
631 case TYPE_DISK:
632 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
633 break;
634 case TYPE_ROM:
635 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
636 break;
637 default:
638 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
639 break;
640 }
641
642 if (!(dev)) {
643 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
644 scsi_host_put(sh);
645 else if (legacy_mode_enable) {
646 pscsi_pmode_enable_hba(hba, 0);
647 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
648 }
649 pdv->pdv_sd = NULL;
650 return ERR_PTR(-ENODEV);
651 }
652 return dev;
653 }
654 spin_unlock_irq(sh->host_lock);
655
656 printk(KERN_ERR "pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
657 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
658
659 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
660 scsi_host_put(sh);
661 else if (legacy_mode_enable) {
662 pscsi_pmode_enable_hba(hba, 0);
663 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
664 }
665
666 return ERR_PTR(-ENODEV);
667}
668
669/* pscsi_free_device(): (Part of se_subsystem_api_t template)
670 *
671 *
672 */
673static void pscsi_free_device(void *p)
674{
675 struct pscsi_dev_virt *pdv = p;
676 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
677 struct scsi_device *sd = pdv->pdv_sd;
678
679 if (sd) {
680 /*
681 * Release exclusive pSCSI internal struct block_device claim for
682 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
683 */
684 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
685 blkdev_put(pdv->pdv_bd,
686 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
687 pdv->pdv_bd = NULL;
688 }
689 /*
690 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
691 * to struct Scsi_Host now.
692 */
693 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
694 (phv->phv_lld_host != NULL))
695 scsi_host_put(phv->phv_lld_host);
696
697 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
698 scsi_device_put(sd);
699
700 pdv->pdv_sd = NULL;
701 }
702
703 kfree(pdv);
704}
705
706static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
707{
708 return container_of(task, struct pscsi_plugin_task, pscsi_task);
709}
710
711
712/* pscsi_transport_complete():
713 *
714 *
715 */
716static int pscsi_transport_complete(struct se_task *task)
717{
718 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
719 struct scsi_device *sd = pdv->pdv_sd;
720 int result;
721 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
722 unsigned char *cdb = &pt->pscsi_cdb[0];
723
724 result = pt->pscsi_result;
725 /*
726 * Hack to make sure that Write-Protect modepage is set if R/O mode is
727 * forced.
728 */
729 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
730 (status_byte(result) << 1) == SAM_STAT_GOOD) {
731 if (!TASK_CMD(task)->se_deve)
732 goto after_mode_sense;
733
734 if (TASK_CMD(task)->se_deve->lun_flags &
735 TRANSPORT_LUNFLAGS_READ_ONLY) {
736 unsigned char *buf = (unsigned char *)
737 T_TASK(task->task_se_cmd)->t_task_buf;
738
739 if (cdb[0] == MODE_SENSE_10) {
740 if (!(buf[3] & 0x80))
741 buf[3] |= 0x80;
742 } else {
743 if (!(buf[2] & 0x80))
744 buf[2] |= 0x80;
745 }
746 }
747 }
748after_mode_sense:
749
750 if (sd->type != TYPE_TAPE)
751 goto after_mode_select;
752
753 /*
754 * Hack to correctly obtain the initiator requested blocksize for
755 * TYPE_TAPE. Since this value is dependent upon each tape media,
756 * struct scsi_device->sector_size will not contain the correct value
757 * by default, so we go ahead and set it so
758 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
759 * storage engine.
760 */
761 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
762 (status_byte(result) << 1) == SAM_STAT_GOOD) {
763 unsigned char *buf;
764 struct scatterlist *sg = task->task_sg;
765 u16 bdl;
766 u32 blocksize;
767
768 buf = sg_virt(&sg[0]);
769 if (!(buf)) {
770 printk(KERN_ERR "Unable to get buf for scatterlist\n");
771 goto after_mode_select;
772 }
773
774 if (cdb[0] == MODE_SELECT)
775 bdl = (buf[3]);
776 else
777 bdl = (buf[6] << 8) | (buf[7]);
778
779 if (!bdl)
780 goto after_mode_select;
781
782 if (cdb[0] == MODE_SELECT)
783 blocksize = (buf[9] << 16) | (buf[10] << 8) |
784 (buf[11]);
785 else
786 blocksize = (buf[13] << 16) | (buf[14] << 8) |
787 (buf[15]);
788
789 sd->sector_size = blocksize;
790 }
791after_mode_select:
792
793 if (status_byte(result) & CHECK_CONDITION)
794 return 1;
795
796 return 0;
797}
798
799static struct se_task *
800pscsi_alloc_task(struct se_cmd *cmd)
801{
802 struct pscsi_plugin_task *pt;
803 unsigned char *cdb = T_TASK(cmd)->t_task_cdb;
804
805 pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL);
806 if (!pt) {
807 printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n");
808 return NULL;
809 }
810
811 /*
812 * If TCM Core is signaling a > TCM_MAX_COMMAND_SIZE allocation,
813 * allocate the extended CDB buffer for per struct se_task context
814 * pt->pscsi_cdb now.
815 */
816 if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) {
817
818 pt->pscsi_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL);
819 if (!(pt->pscsi_cdb)) {
820 printk(KERN_ERR "pSCSI: Unable to allocate extended"
821 " pt->pscsi_cdb\n");
822 kfree(pt);
823 return NULL;
824 }
825 } else
826 pt->pscsi_cdb = &pt->__pscsi_cdb[0];
827
828 return &pt->pscsi_task;
829}
830
831static inline void pscsi_blk_init_request(
832 struct se_task *task,
833 struct pscsi_plugin_task *pt,
834 struct request *req,
835 int bidi_read)
836{
837 /*
838 * Defined as "scsi command" in include/linux/blkdev.h.
839 */
840 req->cmd_type = REQ_TYPE_BLOCK_PC;
841 /*
842 * For the extra BIDI-COMMAND READ struct request we do not
843 * need to setup the remaining structure members
844 */
845 if (bidi_read)
846 return;
847 /*
848 * Setup the done function pointer for struct request,
849 * also set the end_io_data pointer.to struct se_task.
850 */
851 req->end_io = pscsi_req_done;
852 req->end_io_data = (void *)task;
853 /*
854 * Load the referenced struct se_task's SCSI CDB into
855 * include/linux/blkdev.h:struct request->cmd
856 */
857 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
858 req->cmd = &pt->pscsi_cdb[0];
859 /*
860 * Setup pointer for outgoing sense data.
861 */
862 req->sense = (void *)&pt->pscsi_sense[0];
863 req->sense_len = 0;
864}
865
866/*
867 * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
868*/
869static int pscsi_blk_get_request(struct se_task *task)
870{
871 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
872 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
873
874 pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
875 (task->task_data_direction == DMA_TO_DEVICE),
876 GFP_KERNEL);
877 if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) {
878 printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n",
879 IS_ERR(pt->pscsi_req));
880 return PYX_TRANSPORT_LU_COMM_FAILURE;
881 }
882 /*
883 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
884 * and setup rq callback, CDB and sense.
885 */
886 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
887 return 0;
888}
889
890/* pscsi_do_task(): (Part of se_subsystem_api_t template)
891 *
892 *
893 */
894static int pscsi_do_task(struct se_task *task)
895{
896 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
897 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
898 /*
899 * Set the struct request->timeout value based on peripheral
900 * device type from SCSI.
901 */
902 if (pdv->pdv_sd->type == TYPE_DISK)
903 pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
904 else
905 pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
906
907 pt->pscsi_req->retries = PS_RETRY;
908 /*
909 * Queue the struct request into the struct scsi_device->request_queue.
910 * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
911 * descriptor
912 */
913 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
914 (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
915 pscsi_req_done);
916
917 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
918}
919
920static void pscsi_free_task(struct se_task *task)
921{
922 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
923 struct se_cmd *cmd = task->task_se_cmd;
924
925 /*
926 * Release the extended CDB allocation from pscsi_alloc_task()
927 * if one exists.
928 */
929 if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb)
930 kfree(pt->pscsi_cdb);
931 /*
932 * We do not release the bio(s) here associated with this task, as
933 * this is handled by bio_put() and pscsi_bi_endio().
934 */
935 kfree(pt);
936}
937
938enum {
939 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
940 Opt_scsi_lun_id, Opt_err
941};
942
943static match_table_t tokens = {
944 {Opt_scsi_host_id, "scsi_host_id=%d"},
945 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
946 {Opt_scsi_target_id, "scsi_target_id=%d"},
947 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
948 {Opt_err, NULL}
949};
950
951static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
952 struct se_subsystem_dev *se_dev,
953 const char *page,
954 ssize_t count)
955{
956 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
957 struct pscsi_hba_virt *phv = hba->hba_ptr;
958 char *orig, *ptr, *opts;
959 substring_t args[MAX_OPT_ARGS];
960 int ret = 0, arg, token;
961
962 opts = kstrdup(page, GFP_KERNEL);
963 if (!opts)
964 return -ENOMEM;
965
966 orig = opts;
967
968 while ((ptr = strsep(&opts, ",")) != NULL) {
969 if (!*ptr)
970 continue;
971
972 token = match_token(ptr, tokens, args);
973 switch (token) {
974 case Opt_scsi_host_id:
975 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
976 printk(KERN_ERR "PSCSI[%d]: Unable to accept"
977 " scsi_host_id while phv_mode =="
978 " PHV_LLD_SCSI_HOST_NO\n",
979 phv->phv_host_id);
980 ret = -EINVAL;
981 goto out;
982 }
983 match_int(args, &arg);
984 pdv->pdv_host_id = arg;
985 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:"
986 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
987 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
988 break;
989 case Opt_scsi_channel_id:
990 match_int(args, &arg);
991 pdv->pdv_channel_id = arg;
992 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel"
993 " ID: %d\n", phv->phv_host_id,
994 pdv->pdv_channel_id);
995 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
996 break;
997 case Opt_scsi_target_id:
998 match_int(args, &arg);
999 pdv->pdv_target_id = arg;
1000 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target"
1001 " ID: %d\n", phv->phv_host_id,
1002 pdv->pdv_target_id);
1003 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
1004 break;
1005 case Opt_scsi_lun_id:
1006 match_int(args, &arg);
1007 pdv->pdv_lun_id = arg;
1008 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:"
1009 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
1010 pdv->pdv_flags |= PDF_HAS_LUN_ID;
1011 break;
1012 default:
1013 break;
1014 }
1015 }
1016
1017out:
1018 kfree(orig);
1019 return (!ret) ? count : ret;
1020}
1021
1022static ssize_t pscsi_check_configfs_dev_params(
1023 struct se_hba *hba,
1024 struct se_subsystem_dev *se_dev)
1025{
1026 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
1027
1028 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
1029 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
1030 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
1031 printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and"
1032 " scsi_lun_id= parameters\n");
1033 return -1;
1034 }
1035
1036 return 0;
1037}
1038
1039static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
1040 struct se_subsystem_dev *se_dev,
1041 char *b)
1042{
1043 struct pscsi_hba_virt *phv = hba->hba_ptr;
1044 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
1045 struct scsi_device *sd = pdv->pdv_sd;
1046 unsigned char host_id[16];
1047 ssize_t bl;
1048 int i;
1049
1050 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
1051 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
1052 else
1053 snprintf(host_id, 16, "PHBA Mode");
1054
1055 bl = sprintf(b, "SCSI Device Bus Location:"
1056 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
1057 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
1058 host_id);
1059
1060 if (sd) {
1061 bl += sprintf(b + bl, " ");
1062 bl += sprintf(b + bl, "Vendor: ");
1063 for (i = 0; i < 8; i++) {
1064 if (ISPRINT(sd->vendor[i])) /* printable character? */
1065 bl += sprintf(b + bl, "%c", sd->vendor[i]);
1066 else
1067 bl += sprintf(b + bl, " ");
1068 }
1069 bl += sprintf(b + bl, " Model: ");
1070 for (i = 0; i < 16; i++) {
1071 if (ISPRINT(sd->model[i])) /* printable character ? */
1072 bl += sprintf(b + bl, "%c", sd->model[i]);
1073 else
1074 bl += sprintf(b + bl, " ");
1075 }
1076 bl += sprintf(b + bl, " Rev: ");
1077 for (i = 0; i < 4; i++) {
1078 if (ISPRINT(sd->rev[i])) /* printable character ? */
1079 bl += sprintf(b + bl, "%c", sd->rev[i]);
1080 else
1081 bl += sprintf(b + bl, " ");
1082 }
1083 bl += sprintf(b + bl, "\n");
1084 }
1085 return bl;
1086}
1087
1088static void pscsi_bi_endio(struct bio *bio, int error)
1089{
1090 bio_put(bio);
1091}
1092
1093static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num)
1094{
1095 struct bio *bio;
1096 /*
1097 * Use bio_malloc() following the comment in for bio -> struct request
1098 * in block/blk-core.c:blk_make_request()
1099 */
1100 bio = bio_kmalloc(GFP_KERNEL, sg_num);
1101 if (!(bio)) {
1102 printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n");
1103 return NULL;
1104 }
1105 bio->bi_end_io = pscsi_bi_endio;
1106
1107 return bio;
1108}
1109
1110#if 0
1111#define DEBUG_PSCSI(x...) printk(x)
1112#else
1113#define DEBUG_PSCSI(x...)
1114#endif
1115
1116static int __pscsi_map_task_SG(
1117 struct se_task *task,
1118 struct scatterlist *task_sg,
1119 u32 task_sg_num,
1120 int bidi_read)
1121{
1122 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1123 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1124 struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
1125 struct page *page;
1126 struct scatterlist *sg;
1127 u32 data_len = task->task_size, i, len, bytes, off;
1128 int nr_pages = (task->task_size + task_sg[0].offset +
1129 PAGE_SIZE - 1) >> PAGE_SHIFT;
1130 int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
1131 int rw = (task->task_data_direction == DMA_TO_DEVICE);
1132
1133 if (!task->task_size)
1134 return 0;
1135 /*
1136 * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
1137 * the bio_vec maplist from TC< struct se_mem -> task->task_sg ->
1138 * struct scatterlist memory. The struct se_task->task_sg[] currently needs
1139 * to be attached to struct bios for submission to Linux/SCSI using
1140 * struct request to struct scsi_device->request_queue.
1141 *
1142 * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
1143 * is ported to upstream SCSI passthrough functionality that accepts
1144 * struct scatterlist->page_link or struct page as a paraemeter.
1145 */
1146 DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages);
1147
1148 for_each_sg(task_sg, sg, task_sg_num, i) {
1149 page = sg_page(sg);
1150 off = sg->offset;
1151 len = sg->length;
1152
1153 DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i,
1154 page, len, off);
1155
1156 while (len > 0 && data_len > 0) {
1157 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
1158 bytes = min(bytes, data_len);
1159
1160 if (!(bio)) {
1161 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
1162 nr_pages -= nr_vecs;
1163 /*
1164 * Calls bio_kmalloc() and sets bio->bi_end_io()
1165 */
1166 bio = pscsi_get_bio(pdv, nr_vecs);
1167 if (!(bio))
1168 goto fail;
1169
1170 if (rw)
1171 bio->bi_rw |= REQ_WRITE;
1172
1173 DEBUG_PSCSI("PSCSI: Allocated bio: %p,"
1174 " dir: %s nr_vecs: %d\n", bio,
1175 (rw) ? "rw" : "r", nr_vecs);
1176 /*
1177 * Set *hbio pointer to handle the case:
1178 * nr_pages > BIO_MAX_PAGES, where additional
1179 * bios need to be added to complete a given
1180 * struct se_task
1181 */
1182 if (!hbio)
1183 hbio = tbio = bio;
1184 else
1185 tbio = tbio->bi_next = bio;
1186 }
1187
1188 DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d"
1189 " bio: %p page: %p len: %d off: %d\n", i, bio,
1190 page, len, off);
1191
1192 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1193 bio, page, bytes, off);
1194 if (rc != bytes)
1195 goto fail;
1196
1197 DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1198 bio->bi_vcnt, nr_vecs);
1199
1200 if (bio->bi_vcnt > nr_vecs) {
1201 DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:"
1202 " %d i: %d bio: %p, allocating another"
1203 " bio\n", bio->bi_vcnt, i, bio);
1204 /*
1205 * Clear the pointer so that another bio will
1206 * be allocated with pscsi_get_bio() above, the
1207 * current bio has already been set *tbio and
1208 * bio->bi_next.
1209 */
1210 bio = NULL;
1211 }
1212
1213 page++;
1214 len -= bytes;
1215 data_len -= bytes;
1216 off = 0;
1217 }
1218 }
1219 /*
1220 * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
1221 * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
1222 */
1223 if (!(bidi_read)) {
1224 /*
1225 * Starting with v2.6.31, call blk_make_request() passing in *hbio to
1226 * allocate the pSCSI task a struct request.
1227 */
1228 pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
1229 hbio, GFP_KERNEL);
1230 if (!(pt->pscsi_req)) {
1231 printk(KERN_ERR "pSCSI: blk_make_request() failed\n");
1232 goto fail;
1233 }
1234 /*
1235 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
1236 * and setup rq callback, CDB and sense.
1237 */
1238 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
1239
1240 return task->task_sg_num;
1241 }
1242 /*
1243 * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
1244 * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
1245 */
1246 pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
1247 hbio, GFP_KERNEL);
1248 if (!(pt->pscsi_req->next_rq)) {
1249 printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n");
1250 goto fail;
1251 }
1252 pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
1253
1254 return task->task_sg_num;
1255fail:
1256 while (hbio) {
1257 bio = hbio;
1258 hbio = hbio->bi_next;
1259 bio->bi_next = NULL;
1260 bio_endio(bio, 0);
1261 }
1262 return ret;
1263}
1264
1265static int pscsi_map_task_SG(struct se_task *task)
1266{
1267 int ret;
1268
1269 /*
1270 * Setup the main struct request for the task->task_sg[] payload
1271 */
1272
1273 ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0);
1274 if (ret >= 0 && task->task_sg_bidi) {
1275 /*
1276 * If present, set up the extra BIDI-COMMAND SCSI READ
1277 * struct request and payload.
1278 */
1279 ret = __pscsi_map_task_SG(task, task->task_sg_bidi,
1280 task->task_sg_num, 1);
1281 }
1282
1283 if (ret < 0)
1284 return PYX_TRANSPORT_LU_COMM_FAILURE;
1285 return 0;
1286}
1287
1288/* pscsi_map_task_non_SG():
1289 *
1290 *
1291 */
1292static int pscsi_map_task_non_SG(struct se_task *task)
1293{
1294 struct se_cmd *cmd = TASK_CMD(task);
1295 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1296 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1297 int ret = 0;
1298
1299 if (pscsi_blk_get_request(task) < 0)
1300 return PYX_TRANSPORT_LU_COMM_FAILURE;
1301
1302 if (!task->task_size)
1303 return 0;
1304
1305 ret = blk_rq_map_kern(pdv->pdv_sd->request_queue,
1306 pt->pscsi_req, T_TASK(cmd)->t_task_buf,
1307 task->task_size, GFP_KERNEL);
1308 if (ret < 0) {
1309 printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret);
1310 return PYX_TRANSPORT_LU_COMM_FAILURE;
1311 }
1312 return 0;
1313}
1314
1315static int pscsi_CDB_none(struct se_task *task)
1316{
1317 return pscsi_blk_get_request(task);
1318}
1319
1320/* pscsi_get_cdb():
1321 *
1322 *
1323 */
1324static unsigned char *pscsi_get_cdb(struct se_task *task)
1325{
1326 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1327
1328 return pt->pscsi_cdb;
1329}
1330
1331/* pscsi_get_sense_buffer():
1332 *
1333 *
1334 */
1335static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1336{
1337 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1338
1339 return (unsigned char *)&pt->pscsi_sense[0];
1340}
1341
1342/* pscsi_get_device_rev():
1343 *
1344 *
1345 */
1346static u32 pscsi_get_device_rev(struct se_device *dev)
1347{
1348 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1349 struct scsi_device *sd = pdv->pdv_sd;
1350
1351 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1352}
1353
1354/* pscsi_get_device_type():
1355 *
1356 *
1357 */
1358static u32 pscsi_get_device_type(struct se_device *dev)
1359{
1360 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1361 struct scsi_device *sd = pdv->pdv_sd;
1362
1363 return sd->type;
1364}
1365
1366static sector_t pscsi_get_blocks(struct se_device *dev)
1367{
1368 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1369
1370 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1371 return pdv->pdv_bd->bd_part->nr_sects;
1372
1373 dump_stack();
1374 return 0;
1375}
1376
1377/* pscsi_handle_SAM_STATUS_failures():
1378 *
1379 *
1380 */
1381static inline void pscsi_process_SAM_status(
1382 struct se_task *task,
1383 struct pscsi_plugin_task *pt)
1384{
1385 task->task_scsi_status = status_byte(pt->pscsi_result);
1386 if ((task->task_scsi_status)) {
1387 task->task_scsi_status <<= 1;
1388 printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:"
1389 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1390 pt->pscsi_result);
1391 }
1392
1393 switch (host_byte(pt->pscsi_result)) {
1394 case DID_OK:
1395 transport_complete_task(task, (!task->task_scsi_status));
1396 break;
1397 default:
1398 printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:"
1399 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1400 pt->pscsi_result);
1401 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1402 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1403 TASK_CMD(task)->transport_error_status =
1404 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1405 transport_complete_task(task, 0);
1406 break;
1407 }
1408
1409 return;
1410}
1411
1412static void pscsi_req_done(struct request *req, int uptodate)
1413{
1414 struct se_task *task = req->end_io_data;
1415 struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1416
1417 pt->pscsi_result = req->errors;
1418 pt->pscsi_resid = req->resid_len;
1419
1420 pscsi_process_SAM_status(task, pt);
1421 /*
1422 * Release BIDI-READ if present
1423 */
1424 if (req->next_rq != NULL)
1425 __blk_put_request(req->q, req->next_rq);
1426
1427 __blk_put_request(req->q, req);
1428 pt->pscsi_req = NULL;
1429}
1430
1431static struct se_subsystem_api pscsi_template = {
1432 .name = "pscsi",
1433 .owner = THIS_MODULE,
1434 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1435 .cdb_none = pscsi_CDB_none,
1436 .map_task_non_SG = pscsi_map_task_non_SG,
1437 .map_task_SG = pscsi_map_task_SG,
1438 .attach_hba = pscsi_attach_hba,
1439 .detach_hba = pscsi_detach_hba,
1440 .pmode_enable_hba = pscsi_pmode_enable_hba,
1441 .allocate_virtdevice = pscsi_allocate_virtdevice,
1442 .create_virtdevice = pscsi_create_virtdevice,
1443 .free_device = pscsi_free_device,
1444 .transport_complete = pscsi_transport_complete,
1445 .alloc_task = pscsi_alloc_task,
1446 .do_task = pscsi_do_task,
1447 .free_task = pscsi_free_task,
1448 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1449 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1450 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1451 .get_cdb = pscsi_get_cdb,
1452 .get_sense_buffer = pscsi_get_sense_buffer,
1453 .get_device_rev = pscsi_get_device_rev,
1454 .get_device_type = pscsi_get_device_type,
1455 .get_blocks = pscsi_get_blocks,
1456};
1457
1458static int __init pscsi_module_init(void)
1459{
1460 return transport_subsystem_register(&pscsi_template);
1461}
1462
1463static void pscsi_module_exit(void)
1464{
1465 transport_subsystem_release(&pscsi_template);
1466}
1467
1468MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1469MODULE_AUTHOR("nab@Linux-iSCSI.org");
1470MODULE_LICENSE("GPL");
1471
1472module_init(pscsi_module_init);
1473module_exit(pscsi_module_exit);