[SCSI] tcm_fc: Fixing reference counting problem which was causing ft_sess to be...
[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_get_sh():
59  *
60  *
61  */
62 static 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  */
81 static 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
109 static 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
129 static 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
183 static 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;
208 out_free:
209         kfree(buf);
210 }
211
212 static void
213 pscsi_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
231 static int
232 pscsi_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
260 out_free:
261         kfree(buf);
262         return -1;
263 }
264
265 static void
266 pscsi_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
331 out:
332         kfree(buf);
333 }
334
335 /*      pscsi_add_device_to_list():
336  *
337  *
338  */
339 static 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
421 static 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  */
439 static 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  */
487 static 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  */
522 static 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
546 static 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  */
673 static 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
706 static 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  */
716 static 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         }
748 after_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         }
791 after_mode_select:
792
793         if (status_byte(result) & CHECK_CONDITION)
794                 return 1;
795
796         return 0;
797 }
798
799 static struct se_task *
800 pscsi_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
831 static 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 */
869 static 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  */
894 static 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
920 static 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
938 enum {
939         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
940         Opt_scsi_lun_id, Opt_err
941 };
942
943 static 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
951 static 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
1017 out:
1018         kfree(orig);
1019         return (!ret) ? count : ret;
1020 }
1021
1022 static 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
1039 static 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
1088 static void pscsi_bi_endio(struct bio *bio, int error)
1089 {
1090         bio_put(bio);
1091 }
1092
1093 static 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
1116 static 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;
1255 fail:
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
1265 static 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  */
1292 static 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
1315 static 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  */
1324 static 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  */
1335 static 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  */
1346 static 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  */
1358 static 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
1366 static 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  */
1381 static 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
1412 static 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
1431 static 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
1458 static int __init pscsi_module_init(void)
1459 {
1460         return transport_subsystem_register(&pscsi_template);
1461 }
1462
1463 static void pscsi_module_exit(void)
1464 {
1465         transport_subsystem_release(&pscsi_template);
1466 }
1467
1468 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1469 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1470 MODULE_LICENSE("GPL");
1471
1472 module_init(pscsi_module_init);
1473 module_exit(pscsi_module_exit);