3031ef8261ef21703be39c30c409fbfc52be29e4
[linux-3.10.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/libsas.h> /* For TASK_ATTR_* */
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 {
445         struct se_device *dev;
446         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
447         struct Scsi_Host *sh = sd->host;
448         struct block_device *bd;
449         u32 dev_flags = 0;
450
451         if (scsi_device_get(sd)) {
452                 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
453                         sh->host_no, sd->channel, sd->id, sd->lun);
454                 spin_unlock_irq(sh->host_lock);
455                 return NULL;
456         }
457         spin_unlock_irq(sh->host_lock);
458         /*
459          * Claim exclusive struct block_device access to struct scsi_device
460          * for TYPE_DISK using supplied udev_path
461          */
462         bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
463                                 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
464         if (IS_ERR(bd)) {
465                 printk(KERN_ERR "pSCSI: blkdev_get_by_path() failed\n");
466                 scsi_device_put(sd);
467                 return NULL;
468         }
469         pdv->pdv_bd = bd;
470
471         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
472         if (!(dev)) {
473                 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
474                 scsi_device_put(sd);
475                 return NULL;
476         }
477         printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
478                 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
479
480         return dev;
481 }
482
483 /*
484  * Called with struct Scsi_Host->host_lock called.
485  */
486 static struct se_device *pscsi_create_type_rom(
487         struct scsi_device *sd,
488         struct pscsi_dev_virt *pdv,
489         struct se_subsystem_dev *se_dev,
490         struct se_hba *hba)
491 {
492         struct se_device *dev;
493         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
494         struct Scsi_Host *sh = sd->host;
495         u32 dev_flags = 0;
496
497         if (scsi_device_get(sd)) {
498                 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
499                         sh->host_no, sd->channel, sd->id, sd->lun);
500                 spin_unlock_irq(sh->host_lock);
501                 return NULL;
502         }
503         spin_unlock_irq(sh->host_lock);
504
505         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
506         if (!(dev)) {
507                 scsi_device_put(sd);
508                 return NULL;
509         }
510         printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
511                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
512                 sd->channel, sd->id, sd->lun);
513
514         return dev;
515 }
516
517 /*
518  *Called with struct Scsi_Host->host_lock called.
519  */
520 static struct se_device *pscsi_create_type_other(
521         struct scsi_device *sd,
522         struct pscsi_dev_virt *pdv,
523         struct se_subsystem_dev *se_dev,
524         struct se_hba *hba)
525 {
526         struct se_device *dev;
527         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
528         struct Scsi_Host *sh = sd->host;
529         u32 dev_flags = 0;
530
531         spin_unlock_irq(sh->host_lock);
532         dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
533         if (!(dev))
534                 return NULL;
535
536         printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
537                 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
538                 sd->channel, sd->id, sd->lun);
539
540         return dev;
541 }
542
543 static struct se_device *pscsi_create_virtdevice(
544         struct se_hba *hba,
545         struct se_subsystem_dev *se_dev,
546         void *p)
547 {
548         struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
549         struct se_device *dev;
550         struct scsi_device *sd;
551         struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
552         struct Scsi_Host *sh = phv->phv_lld_host;
553         int legacy_mode_enable = 0;
554
555         if (!(pdv)) {
556                 printk(KERN_ERR "Unable to locate struct pscsi_dev_virt"
557                                 " parameter\n");
558                 return NULL;
559         }
560         /*
561          * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
562          * struct Scsi_Host we will need to bring the TCM/pSCSI object online
563          */
564         if (!(sh)) {
565                 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
566                         printk(KERN_ERR "pSCSI: Unable to locate struct"
567                                 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
568                         return NULL;
569                 }
570                 /*
571                  * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
572                  * reference, we enforce that udev_path has been set
573                  */
574                 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
575                         printk(KERN_ERR "pSCSI: udev_path attribute has not"
576                                 " been set before ENABLE=1\n");
577                         return NULL;
578                 }
579                 /*
580                  * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
581                  * use the original TCM hba ID to reference Linux/SCSI Host No
582                  * and enable for PHV_LLD_SCSI_HOST_NO mode.
583                  */
584                 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
585                         spin_lock(&hba->device_lock);
586                         if (!(list_empty(&hba->hba_dev_list))) {
587                                 printk(KERN_ERR "pSCSI: Unable to set hba_mode"
588                                         " with active devices\n");
589                                 spin_unlock(&hba->device_lock);
590                                 return NULL;
591                         }
592                         spin_unlock(&hba->device_lock);
593
594                         if (pscsi_pmode_enable_hba(hba, 1) != 1)
595                                 return NULL;
596
597                         legacy_mode_enable = 1;
598                         hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
599                         sh = phv->phv_lld_host;
600                 } else {
601                         sh = pscsi_get_sh(pdv->pdv_host_id);
602                         if (!(sh)) {
603                                 printk(KERN_ERR "pSCSI: Unable to locate"
604                                         " pdv_host_id: %d\n", pdv->pdv_host_id);
605                                 return NULL;
606                         }
607                 }
608         } else {
609                 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
610                         printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while"
611                                 " struct Scsi_Host exists\n");
612                         return NULL;
613                 }
614         }
615
616         spin_lock_irq(sh->host_lock);
617         list_for_each_entry(sd, &sh->__devices, siblings) {
618                 if ((pdv->pdv_channel_id != sd->channel) ||
619                     (pdv->pdv_target_id != sd->id) ||
620                     (pdv->pdv_lun_id != sd->lun))
621                         continue;
622                 /*
623                  * Functions will release the held struct scsi_host->host_lock
624                  * before calling calling pscsi_add_device_to_list() to register
625                  * struct scsi_device with target_core_mod.
626                  */
627                 switch (sd->type) {
628                 case TYPE_DISK:
629                         dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
630                         break;
631                 case TYPE_ROM:
632                         dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
633                         break;
634                 default:
635                         dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
636                         break;
637                 }
638
639                 if (!(dev)) {
640                         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
641                                 scsi_host_put(sh);
642                         else if (legacy_mode_enable) {
643                                 pscsi_pmode_enable_hba(hba, 0);
644                                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
645                         }
646                         pdv->pdv_sd = NULL;
647                         return NULL;
648                 }
649                 return dev;
650         }
651         spin_unlock_irq(sh->host_lock);
652
653         printk(KERN_ERR "pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
654                 pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
655
656         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
657                 scsi_host_put(sh);
658         else if (legacy_mode_enable) {
659                 pscsi_pmode_enable_hba(hba, 0);
660                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
661         }
662
663         return NULL;
664 }
665
666 /*      pscsi_free_device(): (Part of se_subsystem_api_t template)
667  *
668  *
669  */
670 static void pscsi_free_device(void *p)
671 {
672         struct pscsi_dev_virt *pdv = p;
673         struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
674         struct scsi_device *sd = pdv->pdv_sd;
675
676         if (sd) {
677                 /*
678                  * Release exclusive pSCSI internal struct block_device claim for
679                  * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
680                  */
681                 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
682                         blkdev_put(pdv->pdv_bd,
683                                    FMODE_WRITE|FMODE_READ|FMODE_EXCL);
684                         pdv->pdv_bd = NULL;
685                 }
686                 /*
687                  * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
688                  * to struct Scsi_Host now.
689                  */
690                 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
691                     (phv->phv_lld_host != NULL))
692                         scsi_host_put(phv->phv_lld_host);
693
694                 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
695                         scsi_device_put(sd);
696
697                 pdv->pdv_sd = NULL;
698         }
699
700         kfree(pdv);
701 }
702
703 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
704 {
705         return container_of(task, struct pscsi_plugin_task, pscsi_task);
706 }
707
708
709 /*      pscsi_transport_complete():
710  *
711  *
712  */
713 static int pscsi_transport_complete(struct se_task *task)
714 {
715         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
716         struct scsi_device *sd = pdv->pdv_sd;
717         int result;
718         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
719         unsigned char *cdb = &pt->pscsi_cdb[0];
720
721         result = pt->pscsi_result;
722         /*
723          * Hack to make sure that Write-Protect modepage is set if R/O mode is
724          * forced.
725          */
726         if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
727              (status_byte(result) << 1) == SAM_STAT_GOOD) {
728                 if (!TASK_CMD(task)->se_deve)
729                         goto after_mode_sense;
730
731                 if (TASK_CMD(task)->se_deve->lun_flags &
732                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
733                         unsigned char *buf = (unsigned char *)
734                                 T_TASK(task->task_se_cmd)->t_task_buf;
735
736                         if (cdb[0] == MODE_SENSE_10) {
737                                 if (!(buf[3] & 0x80))
738                                         buf[3] |= 0x80;
739                         } else {
740                                 if (!(buf[2] & 0x80))
741                                         buf[2] |= 0x80;
742                         }
743                 }
744         }
745 after_mode_sense:
746
747         if (sd->type != TYPE_TAPE)
748                 goto after_mode_select;
749
750         /*
751          * Hack to correctly obtain the initiator requested blocksize for
752          * TYPE_TAPE.  Since this value is dependent upon each tape media,
753          * struct scsi_device->sector_size will not contain the correct value
754          * by default, so we go ahead and set it so
755          * TRANSPORT(dev)->get_blockdev() returns the correct value to the
756          * storage engine.
757          */
758         if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
759               (status_byte(result) << 1) == SAM_STAT_GOOD) {
760                 unsigned char *buf;
761                 struct scatterlist *sg = task->task_sg;
762                 u16 bdl;
763                 u32 blocksize;
764
765                 buf = sg_virt(&sg[0]);
766                 if (!(buf)) {
767                         printk(KERN_ERR "Unable to get buf for scatterlist\n");
768                         goto after_mode_select;
769                 }
770
771                 if (cdb[0] == MODE_SELECT)
772                         bdl = (buf[3]);
773                 else
774                         bdl = (buf[6] << 8) | (buf[7]);
775
776                 if (!bdl)
777                         goto after_mode_select;
778
779                 if (cdb[0] == MODE_SELECT)
780                         blocksize = (buf[9] << 16) | (buf[10] << 8) |
781                                         (buf[11]);
782                 else
783                         blocksize = (buf[13] << 16) | (buf[14] << 8) |
784                                         (buf[15]);
785
786                 sd->sector_size = blocksize;
787         }
788 after_mode_select:
789
790         if (status_byte(result) & CHECK_CONDITION)
791                 return 1;
792
793         return 0;
794 }
795
796 static struct se_task *
797 pscsi_alloc_task(struct se_cmd *cmd)
798 {
799         struct pscsi_plugin_task *pt;
800         unsigned char *cdb = T_TASK(cmd)->t_task_cdb;
801
802         pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL);
803         if (!pt) {
804                 printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n");
805                 return NULL;
806         }
807
808         /*
809          * If TCM Core is signaling a > TCM_MAX_COMMAND_SIZE allocation,
810          * allocate the extended CDB buffer for per struct se_task context
811          * pt->pscsi_cdb now.
812          */
813         if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) {
814
815                 pt->pscsi_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL);
816                 if (!(pt->pscsi_cdb)) {
817                         printk(KERN_ERR "pSCSI: Unable to allocate extended"
818                                         " pt->pscsi_cdb\n");
819                         kfree(pt);
820                         return NULL;
821                 }
822         } else
823                 pt->pscsi_cdb = &pt->__pscsi_cdb[0];
824
825         return &pt->pscsi_task;
826 }
827
828 static inline void pscsi_blk_init_request(
829         struct se_task *task,
830         struct pscsi_plugin_task *pt,
831         struct request *req,
832         int bidi_read)
833 {
834         /*
835          * Defined as "scsi command" in include/linux/blkdev.h.
836          */
837         req->cmd_type = REQ_TYPE_BLOCK_PC;
838         /*
839          * For the extra BIDI-COMMAND READ struct request we do not
840          * need to setup the remaining structure members
841          */
842         if (bidi_read)
843                 return;
844         /*
845          * Setup the done function pointer for struct request,
846          * also set the end_io_data pointer.to struct se_task.
847          */
848         req->end_io = pscsi_req_done;
849         req->end_io_data = (void *)task;
850         /*
851          * Load the referenced struct se_task's SCSI CDB into
852          * include/linux/blkdev.h:struct request->cmd
853          */
854         req->cmd_len = scsi_command_size(pt->pscsi_cdb);
855         req->cmd = &pt->pscsi_cdb[0];
856         /*
857          * Setup pointer for outgoing sense data.
858          */
859         req->sense = (void *)&pt->pscsi_sense[0];
860         req->sense_len = 0;
861 }
862
863 /*
864  * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
865 */
866 static int pscsi_blk_get_request(struct se_task *task)
867 {
868         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
869         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
870
871         pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
872                         (task->task_data_direction == DMA_TO_DEVICE),
873                         GFP_KERNEL);
874         if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) {
875                 printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n",
876                                 IS_ERR(pt->pscsi_req));
877                 return PYX_TRANSPORT_LU_COMM_FAILURE;
878         }
879         /*
880          * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
881          * and setup rq callback, CDB and sense.
882          */
883         pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
884         return 0;
885 }
886
887 /*      pscsi_do_task(): (Part of se_subsystem_api_t template)
888  *
889  *
890  */
891 static int pscsi_do_task(struct se_task *task)
892 {
893         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
894         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
895         /*
896          * Set the struct request->timeout value based on peripheral
897          * device type from SCSI.
898          */
899         if (pdv->pdv_sd->type == TYPE_DISK)
900                 pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
901         else
902                 pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
903
904         pt->pscsi_req->retries = PS_RETRY;
905         /*
906          * Queue the struct request into the struct scsi_device->request_queue.
907          * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
908          * descriptor
909          */
910         blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
911                         (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ),
912                         pscsi_req_done);
913
914         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
915 }
916
917 static void pscsi_free_task(struct se_task *task)
918 {
919         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
920         struct se_cmd *cmd = task->task_se_cmd;
921
922         /*
923          * Release the extended CDB allocation from pscsi_alloc_task()
924          * if one exists.
925          */
926         if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb)
927                 kfree(pt->pscsi_cdb);
928         /*
929          * We do not release the bio(s) here associated with this task, as
930          * this is handled by bio_put() and pscsi_bi_endio().
931          */
932         kfree(pt);
933 }
934
935 enum {
936         Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
937         Opt_scsi_lun_id, Opt_err
938 };
939
940 static match_table_t tokens = {
941         {Opt_scsi_host_id, "scsi_host_id=%d"},
942         {Opt_scsi_channel_id, "scsi_channel_id=%d"},
943         {Opt_scsi_target_id, "scsi_target_id=%d"},
944         {Opt_scsi_lun_id, "scsi_lun_id=%d"},
945         {Opt_err, NULL}
946 };
947
948 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
949         struct se_subsystem_dev *se_dev,
950         const char *page,
951         ssize_t count)
952 {
953         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
954         struct pscsi_hba_virt *phv = hba->hba_ptr;
955         char *orig, *ptr, *opts;
956         substring_t args[MAX_OPT_ARGS];
957         int ret = 0, arg, token;
958
959         opts = kstrdup(page, GFP_KERNEL);
960         if (!opts)
961                 return -ENOMEM;
962
963         orig = opts;
964
965         while ((ptr = strsep(&opts, ",")) != NULL) {
966                 if (!*ptr)
967                         continue;
968
969                 token = match_token(ptr, tokens, args);
970                 switch (token) {
971                 case Opt_scsi_host_id:
972                         if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
973                                 printk(KERN_ERR "PSCSI[%d]: Unable to accept"
974                                         " scsi_host_id while phv_mode =="
975                                         " PHV_LLD_SCSI_HOST_NO\n",
976                                         phv->phv_host_id);
977                                 ret = -EINVAL;
978                                 goto out;
979                         }
980                         match_int(args, &arg);
981                         pdv->pdv_host_id = arg;
982                         printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:"
983                                 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
984                         pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
985                         break;
986                 case Opt_scsi_channel_id:
987                         match_int(args, &arg);
988                         pdv->pdv_channel_id = arg;
989                         printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel"
990                                 " ID: %d\n",  phv->phv_host_id,
991                                 pdv->pdv_channel_id);
992                         pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
993                         break;
994                 case Opt_scsi_target_id:
995                         match_int(args, &arg);
996                         pdv->pdv_target_id = arg;
997                         printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target"
998                                 " ID: %d\n", phv->phv_host_id,
999                                 pdv->pdv_target_id);
1000                         pdv->pdv_flags |= PDF_HAS_TARGET_ID;
1001                         break;
1002                 case Opt_scsi_lun_id:
1003                         match_int(args, &arg);
1004                         pdv->pdv_lun_id = arg;
1005                         printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:"
1006                                 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
1007                         pdv->pdv_flags |= PDF_HAS_LUN_ID;
1008                         break;
1009                 default:
1010                         break;
1011                 }
1012         }
1013
1014 out:
1015         kfree(orig);
1016         return (!ret) ? count : ret;
1017 }
1018
1019 static ssize_t pscsi_check_configfs_dev_params(
1020         struct se_hba *hba,
1021         struct se_subsystem_dev *se_dev)
1022 {
1023         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
1024
1025         if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
1026             !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
1027             !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
1028                 printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and"
1029                         " scsi_lun_id= parameters\n");
1030                 return -1;
1031         }
1032
1033         return 0;
1034 }
1035
1036 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
1037                                               struct se_subsystem_dev *se_dev,
1038                                               char *b)
1039 {
1040         struct pscsi_hba_virt *phv = hba->hba_ptr;
1041         struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
1042         struct scsi_device *sd = pdv->pdv_sd;
1043         unsigned char host_id[16];
1044         ssize_t bl;
1045         int i;
1046
1047         if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
1048                 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
1049         else
1050                 snprintf(host_id, 16, "PHBA Mode");
1051
1052         bl = sprintf(b, "SCSI Device Bus Location:"
1053                 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
1054                 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
1055                 host_id);
1056
1057         if (sd) {
1058                 bl += sprintf(b + bl, "        ");
1059                 bl += sprintf(b + bl, "Vendor: ");
1060                 for (i = 0; i < 8; i++) {
1061                         if (ISPRINT(sd->vendor[i]))   /* printable character? */
1062                                 bl += sprintf(b + bl, "%c", sd->vendor[i]);
1063                         else
1064                                 bl += sprintf(b + bl, " ");
1065                 }
1066                 bl += sprintf(b + bl, " Model: ");
1067                 for (i = 0; i < 16; i++) {
1068                         if (ISPRINT(sd->model[i]))   /* printable character ? */
1069                                 bl += sprintf(b + bl, "%c", sd->model[i]);
1070                         else
1071                                 bl += sprintf(b + bl, " ");
1072                 }
1073                 bl += sprintf(b + bl, " Rev: ");
1074                 for (i = 0; i < 4; i++) {
1075                         if (ISPRINT(sd->rev[i]))   /* printable character ? */
1076                                 bl += sprintf(b + bl, "%c", sd->rev[i]);
1077                         else
1078                                 bl += sprintf(b + bl, " ");
1079                 }
1080                 bl += sprintf(b + bl, "\n");
1081         }
1082         return bl;
1083 }
1084
1085 static void pscsi_bi_endio(struct bio *bio, int error)
1086 {
1087         bio_put(bio);
1088 }
1089
1090 static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num)
1091 {
1092         struct bio *bio;
1093         /*
1094          * Use bio_malloc() following the comment in for bio -> struct request
1095          * in block/blk-core.c:blk_make_request()
1096          */
1097         bio = bio_kmalloc(GFP_KERNEL, sg_num);
1098         if (!(bio)) {
1099                 printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n");
1100                 return NULL;
1101         }
1102         bio->bi_end_io = pscsi_bi_endio;
1103
1104         return bio;
1105 }
1106
1107 #if 0
1108 #define DEBUG_PSCSI(x...) printk(x)
1109 #else
1110 #define DEBUG_PSCSI(x...)
1111 #endif
1112
1113 static int __pscsi_map_task_SG(
1114         struct se_task *task,
1115         struct scatterlist *task_sg,
1116         u32 task_sg_num,
1117         int bidi_read)
1118 {
1119         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1120         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1121         struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
1122         struct page *page;
1123         struct scatterlist *sg;
1124         u32 data_len = task->task_size, i, len, bytes, off;
1125         int nr_pages = (task->task_size + task_sg[0].offset +
1126                         PAGE_SIZE - 1) >> PAGE_SHIFT;
1127         int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
1128         int rw = (task->task_data_direction == DMA_TO_DEVICE);
1129
1130         if (!task->task_size)
1131                 return 0;
1132         /*
1133          * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
1134          * the bio_vec maplist from TC< struct se_mem -> task->task_sg ->
1135          * struct scatterlist memory.  The struct se_task->task_sg[] currently needs
1136          * to be attached to struct bios for submission to Linux/SCSI using
1137          * struct request to struct scsi_device->request_queue.
1138          *
1139          * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
1140          * is ported to upstream SCSI passthrough functionality that accepts
1141          * struct scatterlist->page_link or struct page as a paraemeter.
1142          */
1143         DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages);
1144
1145         for_each_sg(task_sg, sg, task_sg_num, i) {
1146                 page = sg_page(sg);
1147                 off = sg->offset;
1148                 len = sg->length;
1149
1150                 DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i,
1151                         page, len, off);
1152
1153                 while (len > 0 && data_len > 0) {
1154                         bytes = min_t(unsigned int, len, PAGE_SIZE - off);
1155                         bytes = min(bytes, data_len);
1156
1157                         if (!(bio)) {
1158                                 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
1159                                 nr_pages -= nr_vecs;
1160                                 /*
1161                                  * Calls bio_kmalloc() and sets bio->bi_end_io()
1162                                  */
1163                                 bio = pscsi_get_bio(pdv, nr_vecs);
1164                                 if (!(bio))
1165                                         goto fail;
1166
1167                                 if (rw)
1168                                         bio->bi_rw |= REQ_WRITE;
1169
1170                                 DEBUG_PSCSI("PSCSI: Allocated bio: %p,"
1171                                         " dir: %s nr_vecs: %d\n", bio,
1172                                         (rw) ? "rw" : "r", nr_vecs);
1173                                 /*
1174                                  * Set *hbio pointer to handle the case:
1175                                  * nr_pages > BIO_MAX_PAGES, where additional
1176                                  * bios need to be added to complete a given
1177                                  * struct se_task
1178                                  */
1179                                 if (!hbio)
1180                                         hbio = tbio = bio;
1181                                 else
1182                                         tbio = tbio->bi_next = bio;
1183                         }
1184
1185                         DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d"
1186                                 " bio: %p page: %p len: %d off: %d\n", i, bio,
1187                                 page, len, off);
1188
1189                         rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
1190                                         bio, page, bytes, off);
1191                         if (rc != bytes)
1192                                 goto fail;
1193
1194                         DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1195                                 bio->bi_vcnt, nr_vecs);
1196
1197                         if (bio->bi_vcnt > nr_vecs) {
1198                                 DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:"
1199                                         " %d i: %d bio: %p, allocating another"
1200                                         " bio\n", bio->bi_vcnt, i, bio);
1201                                 /*
1202                                  * Clear the pointer so that another bio will
1203                                  * be allocated with pscsi_get_bio() above, the
1204                                  * current bio has already been set *tbio and
1205                                  * bio->bi_next.
1206                                  */
1207                                 bio = NULL;
1208                         }
1209
1210                         page++;
1211                         len -= bytes;
1212                         data_len -= bytes;
1213                         off = 0;
1214                 }
1215         }
1216         /*
1217          * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
1218          * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
1219          */
1220         if (!(bidi_read)) {
1221                 /*
1222                  * Starting with v2.6.31, call blk_make_request() passing in *hbio to
1223                  * allocate the pSCSI task a struct request.
1224                  */
1225                 pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
1226                                         hbio, GFP_KERNEL);
1227                 if (!(pt->pscsi_req)) {
1228                         printk(KERN_ERR "pSCSI: blk_make_request() failed\n");
1229                         goto fail;
1230                 }
1231                 /*
1232                  * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
1233                  * and setup rq callback, CDB and sense.
1234                  */
1235                 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
1236
1237                 return task->task_sg_num;
1238         }
1239         /*
1240          * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
1241          * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
1242          */
1243         pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
1244                                         hbio, GFP_KERNEL);
1245         if (!(pt->pscsi_req->next_rq)) {
1246                 printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n");
1247                 goto fail;
1248         }
1249         pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
1250
1251         return task->task_sg_num;
1252 fail:
1253         while (hbio) {
1254                 bio = hbio;
1255                 hbio = hbio->bi_next;
1256                 bio->bi_next = NULL;
1257                 bio_endio(bio, 0);
1258         }
1259         return ret;
1260 }
1261
1262 static int pscsi_map_task_SG(struct se_task *task)
1263 {
1264         int ret;
1265
1266         /*
1267          * Setup the main struct request for the task->task_sg[] payload
1268          */
1269
1270         ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0);
1271         if (ret >= 0 && task->task_sg_bidi) {
1272                 /*
1273                  * If present, set up the extra BIDI-COMMAND SCSI READ
1274                  * struct request and payload.
1275                  */
1276                 ret = __pscsi_map_task_SG(task, task->task_sg_bidi,
1277                                         task->task_sg_num, 1);
1278         }
1279
1280         if (ret < 0)
1281                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1282         return 0;
1283 }
1284
1285 /*      pscsi_map_task_non_SG():
1286  *
1287  *
1288  */
1289 static int pscsi_map_task_non_SG(struct se_task *task)
1290 {
1291         struct se_cmd *cmd = TASK_CMD(task);
1292         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1293         struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
1294         int ret = 0;
1295
1296         if (pscsi_blk_get_request(task) < 0)
1297                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1298
1299         if (!task->task_size)
1300                 return 0;
1301
1302         ret = blk_rq_map_kern(pdv->pdv_sd->request_queue,
1303                         pt->pscsi_req, T_TASK(cmd)->t_task_buf,
1304                         task->task_size, GFP_KERNEL);
1305         if (ret < 0) {
1306                 printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret);
1307                 return PYX_TRANSPORT_LU_COMM_FAILURE;
1308         }
1309         return 0;
1310 }
1311
1312 static int pscsi_CDB_none(struct se_task *task)
1313 {
1314         return pscsi_blk_get_request(task);
1315 }
1316
1317 /*      pscsi_get_cdb():
1318  *
1319  *
1320  */
1321 static unsigned char *pscsi_get_cdb(struct se_task *task)
1322 {
1323         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1324
1325         return pt->pscsi_cdb;
1326 }
1327
1328 /*      pscsi_get_sense_buffer():
1329  *
1330  *
1331  */
1332 static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
1333 {
1334         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1335
1336         return (unsigned char *)&pt->pscsi_sense[0];
1337 }
1338
1339 /*      pscsi_get_device_rev():
1340  *
1341  *
1342  */
1343 static u32 pscsi_get_device_rev(struct se_device *dev)
1344 {
1345         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1346         struct scsi_device *sd = pdv->pdv_sd;
1347
1348         return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1349 }
1350
1351 /*      pscsi_get_device_type():
1352  *
1353  *
1354  */
1355 static u32 pscsi_get_device_type(struct se_device *dev)
1356 {
1357         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1358         struct scsi_device *sd = pdv->pdv_sd;
1359
1360         return sd->type;
1361 }
1362
1363 static sector_t pscsi_get_blocks(struct se_device *dev)
1364 {
1365         struct pscsi_dev_virt *pdv = dev->dev_ptr;
1366
1367         if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1368                 return pdv->pdv_bd->bd_part->nr_sects;
1369
1370         dump_stack();
1371         return 0;
1372 }
1373
1374 /*      pscsi_handle_SAM_STATUS_failures():
1375  *
1376  *
1377  */
1378 static inline void pscsi_process_SAM_status(
1379         struct se_task *task,
1380         struct pscsi_plugin_task *pt)
1381 {
1382         task->task_scsi_status = status_byte(pt->pscsi_result);
1383         if ((task->task_scsi_status)) {
1384                 task->task_scsi_status <<= 1;
1385                 printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:"
1386                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1387                         pt->pscsi_result);
1388         }
1389
1390         switch (host_byte(pt->pscsi_result)) {
1391         case DID_OK:
1392                 transport_complete_task(task, (!task->task_scsi_status));
1393                 break;
1394         default:
1395                 printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:"
1396                         " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
1397                         pt->pscsi_result);
1398                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
1399                 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1400                 TASK_CMD(task)->transport_error_status =
1401                                         PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1402                 transport_complete_task(task, 0);
1403                 break;
1404         }
1405
1406         return;
1407 }
1408
1409 static void pscsi_req_done(struct request *req, int uptodate)
1410 {
1411         struct se_task *task = req->end_io_data;
1412         struct pscsi_plugin_task *pt = PSCSI_TASK(task);
1413
1414         pt->pscsi_result = req->errors;
1415         pt->pscsi_resid = req->resid_len;
1416
1417         pscsi_process_SAM_status(task, pt);
1418         /*
1419          * Release BIDI-READ if present
1420          */
1421         if (req->next_rq != NULL)
1422                 __blk_put_request(req->q, req->next_rq);
1423
1424         __blk_put_request(req->q, req);
1425         pt->pscsi_req = NULL;
1426 }
1427
1428 static struct se_subsystem_api pscsi_template = {
1429         .name                   = "pscsi",
1430         .owner                  = THIS_MODULE,
1431         .transport_type         = TRANSPORT_PLUGIN_PHBA_PDEV,
1432         .cdb_none               = pscsi_CDB_none,
1433         .map_task_non_SG        = pscsi_map_task_non_SG,
1434         .map_task_SG            = pscsi_map_task_SG,
1435         .attach_hba             = pscsi_attach_hba,
1436         .detach_hba             = pscsi_detach_hba,
1437         .pmode_enable_hba       = pscsi_pmode_enable_hba,
1438         .allocate_virtdevice    = pscsi_allocate_virtdevice,
1439         .create_virtdevice      = pscsi_create_virtdevice,
1440         .free_device            = pscsi_free_device,
1441         .transport_complete     = pscsi_transport_complete,
1442         .alloc_task             = pscsi_alloc_task,
1443         .do_task                = pscsi_do_task,
1444         .free_task              = pscsi_free_task,
1445         .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1446         .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1447         .show_configfs_dev_params = pscsi_show_configfs_dev_params,
1448         .get_cdb                = pscsi_get_cdb,
1449         .get_sense_buffer       = pscsi_get_sense_buffer,
1450         .get_device_rev         = pscsi_get_device_rev,
1451         .get_device_type        = pscsi_get_device_type,
1452         .get_blocks             = pscsi_get_blocks,
1453 };
1454
1455 static int __init pscsi_module_init(void)
1456 {
1457         return transport_subsystem_register(&pscsi_template);
1458 }
1459
1460 static void pscsi_module_exit(void)
1461 {
1462         transport_subsystem_release(&pscsi_template);
1463 }
1464
1465 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1466 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1467 MODULE_LICENSE("GPL");
1468
1469 module_init(pscsi_module_init);
1470 module_exit(pscsi_module_exit);