video: tegra: host: fix integer overflows
[linux-2.6.git] / drivers / target / target_core_pscsi.c
1 /*******************************************************************************
2  * Filename:  target_core_pscsi.c
3  *
4  * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
5  *
6  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8  * Copyright (c) 2007-2010 Rising Tide Systems
9  * Copyright (c) 2008-2010 Linux-iSCSI.org
10  *
11  * Nicholas A. Bellinger <nab@kernel.org>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26  *
27  ******************************************************************************/
28
29 #include <linux/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
54 static struct se_subsystem_api pscsi_template;
55
56 static void pscsi_req_done(struct request *, int);
57
58 /*      pscsi_attach_hba():
59  *
60  *      pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
61  *      from the passed SCSI Host ID.
62  */
63 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
64 {
65         struct pscsi_hba_virt *phv;
66
67         phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
68         if (!phv) {
69                 pr_err("Unable to allocate struct pscsi_hba_virt\n");
70                 return -ENOMEM;
71         }
72         phv->phv_host_id = host_id;
73         phv->phv_mode = PHV_VIRUTAL_HOST_ID;
74
75         hba->hba_ptr = phv;
76
77         pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
78                 " Generic Target Core Stack %s\n", hba->hba_id,
79                 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
80         pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
81                hba->hba_id);
82
83         return 0;
84 }
85
86 static void pscsi_detach_hba(struct se_hba *hba)
87 {
88         struct pscsi_hba_virt *phv = hba->hba_ptr;
89         struct Scsi_Host *scsi_host = phv->phv_lld_host;
90
91         if (scsi_host) {
92                 scsi_host_put(scsi_host);
93
94                 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
95                         " Generic Target Core\n", hba->hba_id,
96                         (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
97                         "Unknown");
98         } else
99                 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
100                         " from Generic Target Core\n", hba->hba_id);
101
102         kfree(phv);
103         hba->hba_ptr = NULL;
104 }
105
106 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
107 {
108         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
109         struct Scsi_Host *sh = phv->phv_lld_host;
110         /*
111          * Release the struct Scsi_Host
112          */
113         if (!mode_flag) {
114                 if (!sh)
115                         return 0;
116
117                 phv->phv_lld_host = NULL;
118                 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
119
120                 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
121                         " %s\n", hba->hba_id, (sh->hostt->name) ?
122                         (sh->hostt->name) : "Unknown");
123
124                 scsi_host_put(sh);
125                 return 0;
126         }
127         /*
128          * Otherwise, locate struct Scsi_Host from the original passed
129          * pSCSI Host ID and enable for phba mode
130          */
131         sh = scsi_host_lookup(phv->phv_host_id);
132         if (IS_ERR(sh)) {
133                 pr_err("pSCSI: Unable to locate SCSI Host for"
134                         " phv_host_id: %d\n", phv->phv_host_id);
135                 return PTR_ERR(sh);
136         }
137
138         phv->phv_lld_host = sh;
139         phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
140
141         pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
142                 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
143
144         return 1;
145 }
146
147 static void pscsi_tape_read_blocksize(struct se_device *dev,
148                 struct scsi_device *sdev)
149 {
150         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
151         int ret;
152
153         buf = kzalloc(12, GFP_KERNEL);
154         if (!buf)
155                 return;
156
157         memset(cdb, 0, MAX_COMMAND_SIZE);
158         cdb[0] = MODE_SENSE;
159         cdb[4] = 0x0c; /* 12 bytes */
160
161         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
162                         HZ, 1, NULL);
163         if (ret)
164                 goto out_free;
165
166         /*
167          * If MODE_SENSE still returns zero, set the default value to 1024.
168          */
169         sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
170         if (!sdev->sector_size)
171                 sdev->sector_size = 1024;
172 out_free:
173         kfree(buf);
174 }
175
176 static void
177 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
178 {
179         unsigned char *buf;
180
181         if (sdev->inquiry_len < INQUIRY_LEN)
182                 return;
183
184         buf = sdev->inquiry;
185         if (!buf)
186                 return;
187         /*
188          * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
189          */
190         memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
191         memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
192         memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
193 }
194
195 static int
196 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
197 {
198         unsigned char cdb[MAX_COMMAND_SIZE], *buf;
199         int ret;
200
201         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
202         if (!buf)
203                 return -ENOMEM;
204
205         memset(cdb, 0, MAX_COMMAND_SIZE);
206         cdb[0] = INQUIRY;
207         cdb[1] = 0x01; /* Query VPD */
208         cdb[2] = 0x80; /* Unit Serial Number */
209         cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
210         cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
211
212         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
213                               INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
214         if (ret)
215                 goto out_free;
216
217         snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
218
219         wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
220
221         kfree(buf);
222         return 0;
223
224 out_free:
225         kfree(buf);
226         return -EPERM;
227 }
228
229 static void
230 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
231                 struct t10_wwn *wwn)
232 {
233         unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
234         int ident_len, page_len, off = 4, ret;
235         struct t10_vpd *vpd;
236
237         buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
238         if (!buf)
239                 return;
240
241         memset(cdb, 0, MAX_COMMAND_SIZE);
242         cdb[0] = INQUIRY;
243         cdb[1] = 0x01; /* Query VPD */
244         cdb[2] = 0x83; /* Device Identifier */
245         cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
246         cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
247
248         ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
249                               INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
250                               NULL, HZ, 1, NULL);
251         if (ret)
252                 goto out;
253
254         page_len = (buf[2] << 8) | buf[3];
255         while (page_len > 0) {
256                 /* Grab a pointer to the Identification descriptor */
257                 page_83 = &buf[off];
258                 ident_len = page_83[3];
259                 if (!ident_len) {
260                         pr_err("page_83[3]: identifier"
261                                         " length zero!\n");
262                         break;
263                 }
264                 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
265
266                 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
267                 if (!vpd) {
268                         pr_err("Unable to allocate memory for"
269                                         " struct t10_vpd\n");
270                         goto out;
271                 }
272                 INIT_LIST_HEAD(&vpd->vpd_list);
273
274                 transport_set_vpd_proto_id(vpd, page_83);
275                 transport_set_vpd_assoc(vpd, page_83);
276
277                 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
278                         off += (ident_len + 4);
279                         page_len -= (ident_len + 4);
280                         kfree(vpd);
281                         continue;
282                 }
283                 if (transport_set_vpd_ident(vpd, page_83) < 0) {
284                         off += (ident_len + 4);
285                         page_len -= (ident_len + 4);
286                         kfree(vpd);
287                         continue;
288                 }
289
290                 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
291                 off += (ident_len + 4);
292                 page_len -= (ident_len + 4);
293         }
294
295 out:
296         kfree(buf);
297 }
298
299 /*      pscsi_add_device_to_list():
300  *
301  *
302  */
303 static struct se_device *pscsi_add_device_to_list(
304         struct se_hba *hba,
305         struct se_subsystem_dev *se_dev,
306         struct pscsi_dev_virt *pdv,
307         struct scsi_device *sd,
308         int dev_flags)
309 {
310         struct se_device *dev;
311         struct se_dev_limits dev_limits;
312         struct request_queue *q;
313         struct queue_limits *limits;
314
315         memset(&dev_limits, 0, sizeof(struct se_dev_limits));
316
317         if (!sd->queue_depth) {
318                 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
319
320                 pr_err("Set broken SCSI Device %d:%d:%d"
321                         " queue_depth to %d\n", sd->channel, sd->id,
322                                 sd->lun, sd->queue_depth);
323         }
324         /*
325          * Setup the local scope queue_limits from struct request_queue->limits
326          * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
327          */
328         q = sd->request_queue;
329         limits = &dev_limits.limits;
330         limits->logical_block_size = sd->sector_size;
331         limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
332         limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
333         dev_limits.hw_queue_depth = sd->queue_depth;
334         dev_limits.queue_depth = sd->queue_depth;
335         /*
336          * Setup our standard INQUIRY info into se_dev->t10_wwn
337          */
338         pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
339
340         /*
341          * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
342          * which has already been referenced with Linux SCSI code with
343          * scsi_device_get() in this file's pscsi_create_virtdevice().
344          *
345          * The passthrough operations called by the transport_add_device_*
346          * function below will require this pointer to be set for passthroug
347          *  ops.
348          *
349          * For the shutdown case in pscsi_free_device(), this struct
350          * scsi_device  reference is released with Linux SCSI code
351          * scsi_device_put() and the pdv->pdv_sd cleared.
352          */
353         pdv->pdv_sd = sd;
354
355         dev = transport_add_device_to_core_hba(hba, &pscsi_template,
356                                 se_dev, dev_flags, pdv,
357                                 &dev_limits, NULL, NULL);
358         if (!dev) {
359                 pdv->pdv_sd = NULL;
360                 return NULL;
361         }
362
363         /*
364          * Locate VPD WWN Information used for various purposes within
365          * the Storage Engine.
366          */
367         if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
368                 /*
369                  * If VPD Unit Serial returned GOOD status, try
370                  * VPD Device Identification page (0x83).
371                  */
372                 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
373         }
374
375         /*
376          * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
377          */
378         if (sd->type == TYPE_TAPE)
379                 pscsi_tape_read_blocksize(dev, sd);
380         return dev;
381 }
382
383 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
384 {
385         struct pscsi_dev_virt *pdv;
386
387         pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
388         if (!pdv) {
389                 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
390                 return NULL;
391         }
392         pdv->pdv_se_hba = hba;
393
394         pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
395         return pdv;
396 }
397
398 /*
399  * Called with struct Scsi_Host->host_lock called.
400  */
401 static struct se_device *pscsi_create_type_disk(
402         struct scsi_device *sd,
403         struct pscsi_dev_virt *pdv,
404         struct se_subsystem_dev *se_dev,
405         struct se_hba *hba)
406         __releases(sh->host_lock)
407 {
408         struct se_device *dev;
409         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
410         struct Scsi_Host *sh = sd->host;
411         struct block_device *bd;
412         u32 dev_flags = 0;
413
414         if (scsi_device_get(sd)) {
415                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
416                         sh->host_no, sd->channel, sd->id, sd->lun);
417                 spin_unlock_irq(sh->host_lock);
418                 return NULL;
419         }
420         spin_unlock_irq(sh->host_lock);
421         /*
422          * Claim exclusive struct block_device access to struct scsi_device
423          * for TYPE_DISK using supplied udev_path
424          */
425         bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
426                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
427         if (IS_ERR(bd)) {
428                 pr_err("pSCSI: blkdev_get_by_path() failed\n");
429                 scsi_device_put(sd);
430                 return NULL;
431         }
432         pdv->pdv_bd = bd;
433
434         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
435         if (!dev) {
436                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
437                 scsi_device_put(sd);
438                 return NULL;
439         }
440         pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
441                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
442
443         return dev;
444 }
445
446 /*
447  * Called with struct Scsi_Host->host_lock called.
448  */
449 static struct se_device *pscsi_create_type_rom(
450         struct scsi_device *sd,
451         struct pscsi_dev_virt *pdv,
452         struct se_subsystem_dev *se_dev,
453         struct se_hba *hba)
454         __releases(sh->host_lock)
455 {
456         struct se_device *dev;
457         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
458         struct Scsi_Host *sh = sd->host;
459         u32 dev_flags = 0;
460
461         if (scsi_device_get(sd)) {
462                 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
463                         sh->host_no, sd->channel, sd->id, sd->lun);
464                 spin_unlock_irq(sh->host_lock);
465                 return NULL;
466         }
467         spin_unlock_irq(sh->host_lock);
468
469         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
470         if (!dev) {
471                 scsi_device_put(sd);
472                 return NULL;
473         }
474         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
475                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
476                 sd->channel, sd->id, sd->lun);
477
478         return dev;
479 }
480
481 /*
482  *Called with struct Scsi_Host->host_lock called.
483  */
484 static struct se_device *pscsi_create_type_other(
485         struct scsi_device *sd,
486         struct pscsi_dev_virt *pdv,
487         struct se_subsystem_dev *se_dev,
488         struct se_hba *hba)
489         __releases(sh->host_lock)
490 {
491         struct se_device *dev;
492         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
493         struct Scsi_Host *sh = sd->host;
494         u32 dev_flags = 0;
495
496         spin_unlock_irq(sh->host_lock);
497         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
498         if (!dev)
499                 return NULL;
500
501         pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
502                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
503                 sd->channel, sd->id, sd->lun);
504
505         return dev;
506 }
507
508 static struct se_device *pscsi_create_virtdevice(
509         struct se_hba *hba,
510         struct se_subsystem_dev *se_dev,
511         void *p)
512 {
513         struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
514         struct se_device *dev;
515         struct scsi_device *sd;
516         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
517         struct Scsi_Host *sh = phv->phv_lld_host;
518         int legacy_mode_enable = 0;
519
520         if (!pdv) {
521                 pr_err("Unable to locate struct pscsi_dev_virt"
522                                 " parameter\n");
523                 return ERR_PTR(-EINVAL);
524         }
525         /*
526          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
527          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
528          */
529         if (!sh) {
530                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
531                         pr_err("pSCSI: Unable to locate struct"
532                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
533                         return ERR_PTR(-ENODEV);
534                 }
535                 /*
536                  * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
537                  * reference, we enforce that udev_path has been set
538                  */
539                 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
540                         pr_err("pSCSI: udev_path attribute has not"
541                                 " been set before ENABLE=1\n");
542                         return ERR_PTR(-EINVAL);
543                 }
544                 /*
545                  * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
546                  * use the original TCM hba ID to reference Linux/SCSI Host No
547                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
548                  */
549                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
550                         spin_lock(&hba->device_lock);
551                         if (!list_empty(&hba->hba_dev_list)) {
552                                 pr_err("pSCSI: Unable to set hba_mode"
553                                         " with active devices\n");
554                                 spin_unlock(&hba->device_lock);
555                                 return ERR_PTR(-EEXIST);
556                         }
557                         spin_unlock(&hba->device_lock);
558
559                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
560                                 return ERR_PTR(-ENODEV);
561
562                         legacy_mode_enable = 1;
563                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
564                         sh = phv->phv_lld_host;
565                 } else {
566                         sh = scsi_host_lookup(pdv->pdv_host_id);
567                         if (IS_ERR(sh)) {
568                                 pr_err("pSCSI: Unable to locate"
569                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
570                                 return (struct se_device *) sh;
571                         }
572                 }
573         } else {
574                 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
575                         pr_err("pSCSI: PHV_VIRUTAL_HOST_ID set while"
576                                 " struct Scsi_Host exists\n");
577                         return ERR_PTR(-EEXIST);
578                 }
579         }
580
581         spin_lock_irq(sh->host_lock);
582         list_for_each_entry(sd, &sh->__devices, siblings) {
583                 if ((pdv->pdv_channel_id != sd->channel) ||
584                     (pdv->pdv_target_id != sd->id) ||
585                     (pdv->pdv_lun_id != sd->lun))
586                         continue;
587                 /*
588                  * Functions will release the held struct scsi_host->host_lock
589                  * before calling calling pscsi_add_device_to_list() to register
590                  * struct scsi_device with target_core_mod.
591                  */
592                 switch (sd->type) {
593                 case TYPE_DISK:
594                         dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
595                         break;
596                 case TYPE_ROM:
597                         dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
598                         break;
599                 default:
600                         dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
601                         break;
602                 }
603
604                 if (!dev) {
605                         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
606                                 scsi_host_put(sh);
607                         else if (legacy_mode_enable) {
608                                 pscsi_pmode_enable_hba(hba, 0);
609                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
610                         }
611                         pdv->pdv_sd = NULL;
612                         return ERR_PTR(-ENODEV);
613                 }
614                 return dev;
615         }
616         spin_unlock_irq(sh->host_lock);
617
618         pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
619                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
620
621         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
622                 scsi_host_put(sh);
623         else if (legacy_mode_enable) {
624                 pscsi_pmode_enable_hba(hba, 0);
625                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
626         }
627
628         return ERR_PTR(-ENODEV);
629 }
630
631 /*      pscsi_free_device(): (Part of se_subsystem_api_t template)
632  *
633  *
634  */
635 static void pscsi_free_device(void *p)
636 {
637         struct pscsi_dev_virt *pdv = p;
638         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
639         struct scsi_device *sd = pdv->pdv_sd;
640
641         if (sd) {
642                 /*
643                  * Release exclusive pSCSI internal struct block_device claim for
644                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
645                  */
646                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
647                         blkdev_put(pdv->pdv_bd,
648                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
649                         pdv->pdv_bd = NULL;
650                 }
651                 /*
652                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
653                  * to struct Scsi_Host now.
654                  */
655                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
656                     (phv->phv_lld_host != NULL))
657                         scsi_host_put(phv->phv_lld_host);
658
659                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
660                         scsi_device_put(sd);
661
662                 pdv->pdv_sd = NULL;
663         }
664
665         kfree(pdv);
666 }
667
668 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
669 {
670         return container_of(task, struct pscsi_plugin_task, pscsi_task);
671 }
672
673
674 /*      pscsi_transport_complete():
675  *
676  *
677  */
678 static int pscsi_transport_complete(struct se_task *task)
679 {
680         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
681         struct scsi_device *sd = pdv->pdv_sd;
682         int result;
683         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
684         unsigned char *cdb = &pt->pscsi_cdb[0];
685
686         result = pt->pscsi_result;
687         /*
688          * Hack to make sure that Write-Protect modepage is set if R/O mode is
689          * forced.
690          */
691         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
692              (status_byte(result) << 1) == SAM_STAT_GOOD) {
693                 if (!task->task_se_cmd->se_deve)
694                         goto after_mode_sense;
695
696                 if (task->task_se_cmd->se_deve->lun_flags &
697                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
698                         unsigned char *buf = transport_kmap_first_data_page(task->task_se_cmd);
699
700                         if (cdb[0] == MODE_SENSE_10) {
701                                 if (!(buf[3] & 0x80))
702                                         buf[3] |= 0x80;
703                         } else {
704                                 if (!(buf[2] & 0x80))
705                                         buf[2] |= 0x80;
706                         }
707
708                         transport_kunmap_first_data_page(task->task_se_cmd);
709                 }
710         }
711 after_mode_sense:
712
713         if (sd->type != TYPE_TAPE)
714                 goto after_mode_select;
715
716         /*
717          * Hack to correctly obtain the initiator requested blocksize for
718          * TYPE_TAPE.  Since this value is dependent upon each tape media,
719          * struct scsi_device->sector_size will not contain the correct value
720          * by default, so we go ahead and set it so
721          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
722          * storage engine.
723          */
724         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
725               (status_byte(result) << 1) == SAM_STAT_GOOD) {
726                 unsigned char *buf;
727                 struct scatterlist *sg = task->task_sg;
728                 u16 bdl;
729                 u32 blocksize;
730
731                 buf = sg_virt(&sg[0]);
732                 if (!buf) {
733                         pr_err("Unable to get buf for scatterlist\n");
734                         goto after_mode_select;
735                 }
736
737                 if (cdb[0] == MODE_SELECT)
738                         bdl = (buf[3]);
739                 else
740                         bdl = (buf[6] << 8) | (buf[7]);
741
742                 if (!bdl)
743                         goto after_mode_select;
744
745                 if (cdb[0] == MODE_SELECT)
746                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
747                                         (buf[11]);
748                 else
749                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
750                                         (buf[15]);
751
752                 sd->sector_size = blocksize;
753         }
754 after_mode_select:
755
756         if (status_byte(result) & CHECK_CONDITION)
757                 return 1;
758
759         return 0;
760 }
761
762 static struct se_task *
763 pscsi_alloc_task(unsigned char *cdb)
764 {
765         struct pscsi_plugin_task *pt;
766
767         /*
768          * Dynamically alloc cdb space, since it may be larger than
769          * TCM_MAX_COMMAND_SIZE
770          */
771         pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL);
772         if (!pt) {
773                 pr_err("Unable to allocate struct pscsi_plugin_task\n");
774                 return NULL;
775         }
776
777         return &pt->pscsi_task;
778 }
779
780 static inline void pscsi_blk_init_request(
781         struct se_task *task,
782         struct pscsi_plugin_task *pt,
783         struct request *req,
784         int bidi_read)
785 {
786         /*
787          * Defined as "scsi command" in include/linux/blkdev.h.
788          */
789         req->cmd_type = REQ_TYPE_BLOCK_PC;
790         /*
791          * For the extra BIDI-COMMAND READ struct request we do not
792          * need to setup the remaining structure members
793          */
794         if (bidi_read)
795                 return;
796         /*
797          * Setup the done function pointer for struct request,
798          * also set the end_io_data pointer.to struct se_task.
799          */
800         req->end_io = pscsi_req_done;
801         req->end_io_data = task;
802         /*
803          * Load the referenced struct se_task's SCSI CDB into
804          * include/linux/blkdev.h:struct request->cmd
805          */
806         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
807         req->cmd = &pt->pscsi_cdb[0];
808         /*
809          * Setup pointer for outgoing sense data.
810          */
811         req->sense = &pt->pscsi_sense[0];
812         req->sense_len = 0;
813 }
814
815 /*
816  * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
817 */
818 static int pscsi_blk_get_request(struct se_task *task)
819 {
820         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
821         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
822
823         pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
824                         (task->task_data_direction == DMA_TO_DEVICE),
825                         GFP_KERNEL);
826         if (!pt->pscsi_req || IS_ERR(pt->pscsi_req)) {
827                 pr_err("PSCSI: blk_get_request() failed: %ld\n",
828                                 IS_ERR(pt->pscsi_req));
829                 return PYX_TRANSPORT_LU_COMM_FAILURE;
830         }
831         /*
832          * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
833          * and setup rq callback, CDB and sense.
834          */
835         pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
836         return 0;
837 }
838
839 /*      pscsi_do_task(): (Part of se_subsystem_api_t template)
840  *
841  *
842  */
843 static int pscsi_do_task(struct se_task *task)
844 {
845         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
846         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
847         /*
848          * Set the struct request->timeout value based on peripheral
849          * device type from SCSI.
850          */
851         if (pdv->pdv_sd->type == TYPE_DISK)
852                 pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
853         else
854                 pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
855
856         pt->pscsi_req->retries = PS_RETRY;
857         /*
858          * Queue the struct request into the struct scsi_device->request_queue.
859          * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
860          * descriptor
861          */
862         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
863                         (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG),
864                         pscsi_req_done);
865
866         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
867 }
868
869 static void pscsi_free_task(struct se_task *task)
870 {
871         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
872
873         /*
874          * We do not release the bio(s) here associated with this task, as
875          * this is handled by bio_put() and pscsi_bi_endio().
876          */
877         kfree(pt);
878 }
879
880 enum {
881         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
882         Opt_scsi_lun_id, Opt_err
883 };
884
885 static match_table_t tokens = {
886         {Opt_scsi_host_id, "scsi_host_id=%d"},
887         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
888         {Opt_scsi_target_id, "scsi_target_id=%d"},
889         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
890         {Opt_err, NULL}
891 };
892
893 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
894         struct se_subsystem_dev *se_dev,
895         const char *page,
896         ssize_t count)
897 {
898         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
899         struct pscsi_hba_virt *phv = hba->hba_ptr;
900         char *orig, *ptr, *opts;
901         substring_t args[MAX_OPT_ARGS];
902         int ret = 0, arg, token;
903
904         opts = kstrdup(page, GFP_KERNEL);
905         if (!opts)
906                 return -ENOMEM;
907
908         orig = opts;
909
910         while ((ptr = strsep(&opts, ",")) != NULL) {
911                 if (!*ptr)
912                         continue;
913
914                 token = match_token(ptr, tokens, args);
915                 switch (token) {
916                 case Opt_scsi_host_id:
917                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
918                                 pr_err("PSCSI[%d]: Unable to accept"
919                                         " scsi_host_id while phv_mode =="
920                                         " PHV_LLD_SCSI_HOST_NO\n",
921                                         phv->phv_host_id);
922                                 ret = -EINVAL;
923                                 goto out;
924                         }
925                         match_int(args, &arg);
926                         pdv->pdv_host_id = arg;
927                         pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
928                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
929                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
930                         break;
931                 case Opt_scsi_channel_id:
932                         match_int(args, &arg);
933                         pdv->pdv_channel_id = arg;
934                         pr_debug("PSCSI[%d]: Referencing SCSI Channel"
935                                 " ID: %d\n",  phv->phv_host_id,
936                                 pdv->pdv_channel_id);
937                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
938                         break;
939                 case Opt_scsi_target_id:
940                         match_int(args, &arg);
941                         pdv->pdv_target_id = arg;
942                         pr_debug("PSCSI[%d]: Referencing SCSI Target"
943                                 " ID: %d\n", phv->phv_host_id,
944                                 pdv->pdv_target_id);
945                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
946                         break;
947                 case Opt_scsi_lun_id:
948                         match_int(args, &arg);
949                         pdv->pdv_lun_id = arg;
950                         pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
951                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
952                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
953                         break;
954                 default:
955                         break;
956                 }
957         }
958
959 out:
960         kfree(orig);
961         return (!ret) ? count : ret;
962 }
963
964 static ssize_t pscsi_check_configfs_dev_params(
965         struct se_hba *hba,
966         struct se_subsystem_dev *se_dev)
967 {
968         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
969
970         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
971             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
972             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
973                 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
974                         " scsi_lun_id= parameters\n");
975                 return -EINVAL;
976         }
977
978         return 0;
979 }
980
981 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
982                                               struct se_subsystem_dev *se_dev,
983                                               char *b)
984 {
985         struct pscsi_hba_virt *phv = hba->hba_ptr;
986         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
987         struct scsi_device *sd = pdv->pdv_sd;
988         unsigned char host_id[16];
989         ssize_t bl;
990         int i;
991
992         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
993                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
994         else
995                 snprintf(host_id, 16, "PHBA Mode");
996
997         bl = sprintf(b, "SCSI Device Bus Location:"
998                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
999                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
1000                 host_id);
1001
1002         if (sd) {
1003                 bl += sprintf(b + bl, "        ");
1004                 bl += sprintf(b + bl, "Vendor: ");
1005                 for (i = 0; i < 8; i++) {
1006                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
1007                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
1008                         else
1009                                 bl += sprintf(b + bl, " ");
1010                 }
1011                 bl += sprintf(b + bl, " Model: ");
1012                 for (i = 0; i < 16; i++) {
1013                         if (ISPRINT(sd->model[i]))   /* printable character ? */
1014                                 bl += sprintf(b + bl, "%c", sd->model[i]);
1015                         else
1016                                 bl += sprintf(b + bl, " ");
1017                 }
1018                 bl += sprintf(b + bl, " Rev: ");
1019                 for (i = 0; i < 4; i++) {
1020                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
1021                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
1022                         else
1023                                 bl += sprintf(b + bl, " ");
1024                 }
1025                 bl += sprintf(b + bl, "\n");
1026         }
1027         return bl;
1028 }
1029
1030 static void pscsi_bi_endio(struct bio *bio, int error)
1031 {
1032         bio_put(bio);
1033 }
1034
1035 static inline struct bio *pscsi_get_bio(int sg_num)
1036 {
1037         struct bio *bio;
1038         /*
1039          * Use bio_malloc() following the comment in for bio -> struct request
1040          * in block/blk-core.c:blk_make_request()
1041          */
1042         bio = bio_kmalloc(GFP_KERNEL, sg_num);
1043         if (!bio) {
1044                 pr_err("PSCSI: bio_kmalloc() failed\n");
1045                 return NULL;
1046         }
1047         bio->bi_end_io = pscsi_bi_endio;
1048
1049         return bio;
1050 }
1051
1052 static int __pscsi_map_SG(
1053         struct se_task *task,
1054         struct scatterlist *task_sg,
1055         u32 task_sg_num,
1056         int bidi_read)
1057 {
1058         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1059         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1060         struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
1061         struct page *page;
1062         struct scatterlist *sg;
1063         u32 data_len = task->task_size, i, len, bytes, off;
1064         int nr_pages = (task->task_size + task_sg[0].offset +
1065                         PAGE_SIZE - 1) >> PAGE_SHIFT;
1066         int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
1067         int rw = (task->task_data_direction == DMA_TO_DEVICE);
1068
1069         if (!task->task_size)
1070                 return 0;
1071         /*
1072          * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
1073          * the bio_vec maplist from task->task_sg ->
1074          * struct scatterlist memory.  The struct se_task->task_sg[] currently needs
1075          * to be attached to struct bios for submission to Linux/SCSI using
1076          * struct request to struct scsi_device->request_queue.
1077          *
1078          * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
1079          * is ported to upstream SCSI passthrough functionality that accepts
1080          * struct scatterlist->page_link or struct page as a paraemeter.
1081          */
1082         pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
1083
1084         for_each_sg(task_sg, sg, task_sg_num, i) {
1085                 page = sg_page(sg);
1086                 off = sg->offset;
1087                 len = sg->length;
1088
1089                 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
1090                         page, len, off);
1091
1092                 while (len > 0 && data_len > 0) {
1093                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
1094                         bytes = min(bytes, data_len);
1095
1096                         if (!bio) {
1097                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
1098                                 nr_pages -= nr_vecs;
1099                                 /*
1100                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
1101                                  */
1102                                 bio = pscsi_get_bio(nr_vecs);
1103                                 if (!bio)
1104                                         goto fail;
1105
1106                                 if (rw)
1107                                         bio->bi_rw |= REQ_WRITE;
1108
1109                                 pr_debug("PSCSI: Allocated bio: %p,"
1110                                         " dir: %s nr_vecs: %d\n", bio,
1111                                         (rw) ? "rw" : "r", nr_vecs);
1112                                 /*
1113                                  * Set *hbio pointer to handle the case:
1114                                  * nr_pages > BIO_MAX_PAGES, where additional
1115                                  * bios need to be added to complete a given
1116                                  * struct se_task
1117                                  */
1118                                 if (!hbio)
1119                                         hbio = tbio = bio;
1120                                 else
1121                                         tbio = tbio->bi_next = bio;
1122                         }
1123
1124                         pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
1125                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
1126                                 page, len, off);
1127
1128                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1129                                         bio, page, bytes, off);
1130                         if (rc != bytes)
1131                                 goto fail;
1132
1133                         pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1134                                 bio->bi_vcnt, nr_vecs);
1135
1136                         if (bio->bi_vcnt > nr_vecs) {
1137                                 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1138                                         " %d i: %d bio: %p, allocating another"
1139                                         " bio\n", bio->bi_vcnt, i, bio);
1140                                 /*
1141                                  * Clear the pointer so that another bio will
1142                                  * be allocated with pscsi_get_bio() above, the
1143                                  * current bio has already been set *tbio and
1144                                  * bio->bi_next.
1145                                  */
1146                                 bio = NULL;
1147                         }
1148
1149                         page++;
1150                         len -= bytes;
1151                         data_len -= bytes;
1152                         off = 0;
1153                 }
1154         }
1155         /*
1156          * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
1157          * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
1158          */
1159         if (!bidi_read) {
1160                 /*
1161                  * Starting with v2.6.31, call blk_make_request() passing in *hbio to
1162                  * allocate the pSCSI task a struct request.
1163                  */
1164                 pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
1165                                         hbio, GFP_KERNEL);
1166                 if (!pt->pscsi_req) {
1167                         pr_err("pSCSI: blk_make_request() failed\n");
1168                         goto fail;
1169                 }
1170                 /*
1171                  * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
1172                  * and setup rq callback, CDB and sense.
1173                  */
1174                 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
1175
1176                 return task->task_sg_nents;
1177         }
1178         /*
1179          * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
1180          * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
1181          */
1182         pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
1183                                         hbio, GFP_KERNEL);
1184         if (!pt->pscsi_req->next_rq) {
1185                 pr_err("pSCSI: blk_make_request() failed for BIDI\n");
1186                 goto fail;
1187         }
1188         pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
1189
1190         return task->task_sg_nents;
1191 fail:
1192         while (hbio) {
1193                 bio = hbio;
1194                 hbio = hbio->bi_next;
1195                 bio->bi_next = NULL;
1196                 bio_endio(bio, 0);
1197         }
1198         return ret;
1199 }
1200
1201 /*
1202  * pSCSI maps both ->map_control_SG() and ->map_data_SG() to a single call.
1203  */
1204 static int pscsi_map_SG(struct se_task *task)
1205 {
1206         int ret;
1207
1208         /*
1209          * Setup the main struct request for the task->task_sg[] payload
1210          */
1211
1212         ret = __pscsi_map_SG(task, task->task_sg, task->task_sg_nents, 0);
1213         if (ret >= 0 && task->task_sg_bidi) {
1214                 /*
1215                  * If present, set up the extra BIDI-COMMAND SCSI READ
1216                  * struct request and payload.
1217                  */
1218                 ret = __pscsi_map_SG(task, task->task_sg_bidi,
1219                                         task->task_sg_nents, 1);
1220         }
1221
1222         if (ret < 0)
1223                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1224         return 0;
1225 }
1226
1227 static int pscsi_CDB_none(struct se_task *task)
1228 {
1229         return pscsi_blk_get_request(task);
1230 }
1231
1232 /*      pscsi_get_cdb():
1233  *
1234  *
1235  */
1236 static unsigned char *pscsi_get_cdb(struct se_task *task)
1237 {
1238         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1239
1240         return pt->pscsi_cdb;
1241 }
1242
1243 /*      pscsi_get_sense_buffer():
1244  *
1245  *
1246  */
1247 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1248 {
1249         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1250
1251         return (unsigned char *)&pt->pscsi_sense[0];
1252 }
1253
1254 /*      pscsi_get_device_rev():
1255  *
1256  *
1257  */
1258 static u32 pscsi_get_device_rev(struct se_device *dev)
1259 {
1260         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1261         struct scsi_device *sd = pdv->pdv_sd;
1262
1263         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1264 }
1265
1266 /*      pscsi_get_device_type():
1267  *
1268  *
1269  */
1270 static u32 pscsi_get_device_type(struct se_device *dev)
1271 {
1272         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1273         struct scsi_device *sd = pdv->pdv_sd;
1274
1275         return sd->type;
1276 }
1277
1278 static sector_t pscsi_get_blocks(struct se_device *dev)
1279 {
1280         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1281
1282         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1283                 return pdv->pdv_bd->bd_part->nr_sects;
1284
1285         dump_stack();
1286         return 0;
1287 }
1288
1289 /*      pscsi_handle_SAM_STATUS_failures():
1290  *
1291  *
1292  */
1293 static inline void pscsi_process_SAM_status(
1294         struct se_task *task,
1295         struct pscsi_plugin_task *pt)
1296 {
1297         task->task_scsi_status = status_byte(pt->pscsi_result);
1298         if (task->task_scsi_status) {
1299                 task->task_scsi_status <<= 1;
1300                 pr_debug("PSCSI Status Byte exception at task: %p CDB:"
1301                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1302                         pt->pscsi_result);
1303         }
1304
1305         switch (host_byte(pt->pscsi_result)) {
1306         case DID_OK:
1307                 transport_complete_task(task, (!task->task_scsi_status));
1308                 break;
1309         default:
1310                 pr_debug("PSCSI Host Byte exception at task: %p CDB:"
1311                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1312                         pt->pscsi_result);
1313                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1314                 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1315                 task->task_se_cmd->transport_error_status =
1316                                         PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1317                 transport_complete_task(task, 0);
1318                 break;
1319         }
1320 }
1321
1322 static void pscsi_req_done(struct request *req, int uptodate)
1323 {
1324         struct se_task *task = req->end_io_data;
1325         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1326
1327         pt->pscsi_result = req->errors;
1328         pt->pscsi_resid = req->resid_len;
1329
1330         pscsi_process_SAM_status(task, pt);
1331         /*
1332          * Release BIDI-READ if present
1333          */
1334         if (req->next_rq != NULL)
1335                 __blk_put_request(req->q, req->next_rq);
1336
1337         __blk_put_request(req->q, req);
1338         pt->pscsi_req = NULL;
1339 }
1340
1341 static struct se_subsystem_api pscsi_template = {
1342         .name                   = "pscsi",
1343         .owner                  = THIS_MODULE,
1344         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1345         .cdb_none               = pscsi_CDB_none,
1346         .map_control_SG         = pscsi_map_SG,
1347         .map_data_SG            = pscsi_map_SG,
1348         .attach_hba             = pscsi_attach_hba,
1349         .detach_hba             = pscsi_detach_hba,
1350         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1351         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1352         .create_virtdevice      = pscsi_create_virtdevice,
1353         .free_device            = pscsi_free_device,
1354         .transport_complete     = pscsi_transport_complete,
1355         .alloc_task             = pscsi_alloc_task,
1356         .do_task                = pscsi_do_task,
1357         .free_task              = pscsi_free_task,
1358         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1359         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1360         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1361         .get_cdb                = pscsi_get_cdb,
1362         .get_sense_buffer       = pscsi_get_sense_buffer,
1363         .get_device_rev         = pscsi_get_device_rev,
1364         .get_device_type        = pscsi_get_device_type,
1365         .get_blocks             = pscsi_get_blocks,
1366 };
1367
1368 static int __init pscsi_module_init(void)
1369 {
1370         return transport_subsystem_register(&pscsi_template);
1371 }
1372
1373 static void pscsi_module_exit(void)
1374 {
1375         transport_subsystem_release(&pscsi_template);
1376 }
1377
1378 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1379 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1380 MODULE_LICENSE("GPL");
1381
1382 module_init(pscsi_module_init);
1383 module_exit(pscsi_module_exit);