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[SCSI] target: Remove unnecessary hba_dev_list walk and se_clear_dev_ports legacy...
[deliverable/linux.git] / drivers / target / target_core_pscsi.c
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c66ac9db
NB		 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>
c66ac9db
NB		 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
54static struct se_subsystem_api pscsi_template;
55
56static void pscsi_req_done(struct request *, int);
57
58/* pscsi_get_sh():
59 *
60 *
61 */
62static struct Scsi_Host *pscsi_get_sh(u32 host_no)
63{
64 struct Scsi_Host *sh = NULL;
65
66 sh = scsi_host_lookup(host_no);
67 if (IS_ERR(sh)) {
68 printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:"
69 " %u\n", host_no);
70 return NULL;
71 }
72
73 return sh;
74}
75
76/* pscsi_attach_hba():
77 *
78 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
79 * from the passed SCSI Host ID.
80 */
81static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
82{
83 int hba_depth;
84 struct pscsi_hba_virt *phv;
85
86 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
87 if (!(phv)) {
88 printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n");
89 return -1;
90 }
91 phv->phv_host_id = host_id;
92 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
93 hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
94 atomic_set(&hba->left_queue_depth, hba_depth);
95 atomic_set(&hba->max_queue_depth, hba_depth);
96
97 hba->hba_ptr = (void *)phv;
98
99 printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
100 " Generic Target Core Stack %s\n", hba->hba_id,
101 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
102 printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic"
103 " Target Core with TCQ Depth: %d\n", hba->hba_id,
104 atomic_read(&hba->max_queue_depth));
105
106 return 0;
107}
108
109static void pscsi_detach_hba(struct se_hba *hba)
110{
111 struct pscsi_hba_virt *phv = hba->hba_ptr;
112 struct Scsi_Host *scsi_host = phv->phv_lld_host;
113
114 if (scsi_host) {
115 scsi_host_put(scsi_host);
116
117 printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from"
118 " Generic Target Core\n", hba->hba_id,
119 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
120 "Unknown");
121 } else
122 printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA"
123 " from Generic Target Core\n", hba->hba_id);
124
125 kfree(phv);
126 hba->hba_ptr = NULL;
127}
128
129static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
130{
131 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
132 struct Scsi_Host *sh = phv->phv_lld_host;
133 int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
134 /*
135 * Release the struct Scsi_Host
136 */
137 if (!(mode_flag)) {
138 if (!(sh))
139 return 0;
140
141 phv->phv_lld_host = NULL;
142 phv->phv_mode = PHV_VIRUTAL_HOST_ID;
143 atomic_set(&hba->left_queue_depth, hba_depth);
144 atomic_set(&hba->max_queue_depth, hba_depth);
145
146 printk(KERN_INFO "CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
147 " %s\n", hba->hba_id, (sh->hostt->name) ?
148 (sh->hostt->name) : "Unknown");
149
150 scsi_host_put(sh);
151 return 0;
152 }
153 /*
154 * Otherwise, locate struct Scsi_Host from the original passed
155 * pSCSI Host ID and enable for phba mode
156 */
157 sh = pscsi_get_sh(phv->phv_host_id);
158 if (!(sh)) {
159 printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for"
160 " phv_host_id: %d\n", phv->phv_host_id);
161 return -1;
162 }
163 /*
164 * Usually the SCSI LLD will use the hostt->can_queue value to define
165 * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set
166 * this at all and set sh->can_queue at runtime.
167 */
168 hba_depth = (sh->hostt->can_queue > sh->can_queue) ?
169 sh->hostt->can_queue : sh->can_queue;
170
171 atomic_set(&hba->left_queue_depth, hba_depth);
172 atomic_set(&hba->max_queue_depth, hba_depth);
173
174 phv->phv_lld_host = sh;
175 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
176
177 printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
178 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
179
180 return 1;
181}
182
183static void pscsi_tape_read_blocksize(struct se_device *dev,
184 struct scsi_device *sdev)
185{
186 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
187 int ret;
188
189 buf = kzalloc(12, GFP_KERNEL);
190 if (!buf)
191 return;
192
193 memset(cdb, 0, MAX_COMMAND_SIZE);
194 cdb[0] = MODE_SENSE;
195 cdb[4] = 0x0c; /* 12 bytes */
196
197 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
198 HZ, 1, NULL);
199 if (ret)
200 goto out_free;
201
202 /*
203 * If MODE_SENSE still returns zero, set the default value to 1024.
204 */
205 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
206 if (!sdev->sector_size)
207 sdev->sector_size = 1024;
208out_free:
209 kfree(buf);
210}
211
212static void
213pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
214{
215 unsigned char *buf;
216
217 if (sdev->inquiry_len < INQUIRY_LEN)
218 return;
219
220 buf = sdev->inquiry;
221 if (!buf)
222 return;
223 /*
224 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
225 */
226 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
227 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
228 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
229}
230
231static int
232pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
233{
234 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
235 int ret;
236
237 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
238 if (!buf)
239 return -1;
240
241 memset(cdb, 0, MAX_COMMAND_SIZE);
242 cdb[0] = INQUIRY;
243 cdb[1] = 0x01; /* Query VPD */
244 cdb[2] = 0x80; /* Unit Serial Number */
245 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
246 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
247
248 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
249 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
250 if (ret)
251 goto out_free;
252
253 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
254
255 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
256
257 kfree(buf);
258 return 0;
259
260out_free:
261 kfree(buf);
262 return -1;
263}
264
265static void
266pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
267 struct t10_wwn *wwn)
268{
269 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
270 int ident_len, page_len, off = 4, ret;
271 struct t10_vpd *vpd;
272
273 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
274 if (!buf)
275 return;
276
277 memset(cdb, 0, MAX_COMMAND_SIZE);
278 cdb[0] = INQUIRY;
279 cdb[1] = 0x01; /* Query VPD */
280 cdb[2] = 0x83; /* Device Identifier */
281 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
282 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
283
284 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
285 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
286 NULL, HZ, 1, NULL);
287 if (ret)
288 goto out;
289
290 page_len = (buf[2] << 8) | buf[3];
291 while (page_len > 0) {
292 /* Grab a pointer to the Identification descriptor */
293 page_83 = &buf[off];
294 ident_len = page_83[3];
295 if (!ident_len) {
296 printk(KERN_ERR "page_83[3]: identifier"
297 " length zero!\n");
298 break;
299 }
300 printk(KERN_INFO "T10 VPD Identifer Length: %d\n", ident_len);
301
302 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
303 if (!vpd) {
304 printk(KERN_ERR "Unable to allocate memory for"
305 " struct t10_vpd\n");
306 goto out;
307 }
308 INIT_LIST_HEAD(&vpd->vpd_list);
309
310 transport_set_vpd_proto_id(vpd, page_83);
311 transport_set_vpd_assoc(vpd, page_83);
312
313 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
314 off += (ident_len + 4);
315 page_len -= (ident_len + 4);
316 kfree(vpd);
317 continue;
318 }
319 if (transport_set_vpd_ident(vpd, page_83) < 0) {
320 off += (ident_len + 4);
321 page_len -= (ident_len + 4);
322 kfree(vpd);
323 continue;
324 }
325
326 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
327 off += (ident_len + 4);
328 page_len -= (ident_len + 4);
329 }
330
331out:
332 kfree(buf);
333}
334
335/* pscsi_add_device_to_list():
336 *
337 *
338 */
339static struct se_device *pscsi_add_device_to_list(
340 struct se_hba *hba,
341 struct se_subsystem_dev *se_dev,
342 struct pscsi_dev_virt *pdv,
343 struct scsi_device *sd,
344 int dev_flags)
345{
346 struct se_device *dev;
347 struct se_dev_limits dev_limits;
348 struct request_queue *q;
349 struct queue_limits *limits;
350
351 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
352
353 if (!sd->queue_depth) {
354 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
355
356 printk(KERN_ERR "Set broken SCSI Device %d:%d:%d"
357 " queue_depth to %d\n", sd->channel, sd->id,
358 sd->lun, sd->queue_depth);
359 }
360 /*
361 * Setup the local scope queue_limits from struct request_queue->limits
362 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
363 */
364 q = sd->request_queue;
365 limits = &dev_limits.limits;
366 limits->logical_block_size = sd->sector_size;
367 limits->max_hw_sectors = (sd->host->max_sectors > queue_max_hw_sectors(q)) ?
368 queue_max_hw_sectors(q) : sd->host->max_sectors;
369 limits->max_sectors = (sd->host->max_sectors > queue_max_sectors(q)) ?
370 queue_max_sectors(q) : sd->host->max_sectors;
371 dev_limits.hw_queue_depth = sd->queue_depth;
372 dev_limits.queue_depth = sd->queue_depth;
373 /*
374 * Setup our standard INQUIRY info into se_dev->t10_wwn
375 */
376 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
377
378 /*
379 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
380 * which has already been referenced with Linux SCSI code with
381 * scsi_device_get() in this file's pscsi_create_virtdevice().
382 *
383 * The passthrough operations called by the transport_add_device_*
384 * function below will require this pointer to be set for passthroug
385 * ops.
386 *
387 * For the shutdown case in pscsi_free_device(), this struct
388 * scsi_device reference is released with Linux SCSI code
389 * scsi_device_put() and the pdv->pdv_sd cleared.
390 */
391 pdv->pdv_sd = sd;
392
393 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
394 se_dev, dev_flags, (void *)pdv,
395 &dev_limits, NULL, NULL);
396 if (!(dev)) {
397 pdv->pdv_sd = NULL;
398 return NULL;
399 }
400
401 /*
402 * Locate VPD WWN Information used for various purposes within
403 * the Storage Engine.
404 */
405 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
406 /*
407 * If VPD Unit Serial returned GOOD status, try
408 * VPD Device Identification page (0x83).
409 */
410 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
411 }
412
413 /*
414 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
415 */
416 if (sd->type == TYPE_TAPE)
417 pscsi_tape_read_blocksize(dev, sd);
418 return dev;
419}
420
421static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
422{
423 struct pscsi_dev_virt *pdv;
424
425 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
426 if (!(pdv)) {
427 printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n");
428 return NULL;
429 }
430 pdv->pdv_se_hba = hba;
431
432 printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name);
433 return (void *)pdv;
434}
435
436/*
437 * Called with struct Scsi_Host->host_lock called.
438 */
439static struct se_device *pscsi_create_type_disk(
440 struct scsi_device *sd,
441 struct pscsi_dev_virt *pdv,
442 struct se_subsystem_dev *se_dev,
443 struct se_hba *hba)
444{
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);
3ae279d2
DC		 464 if (IS_ERR(bd)) {
465 printk(KERN_ERR "pSCSI: blkdev_get_by_path() failed\n");
c66ac9db
NB		 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 */
486static 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 */
520static 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
543static 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");
613640e4 558 return ERR_PTR(-EINVAL);
c66ac9db
NB		 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");
613640e4 568 return ERR_PTR(-ENODEV);
c66ac9db
NB		 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");
613640e4 577 return ERR_PTR(-EINVAL);
c66ac9db
NB		 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);
613640e4 590 return ERR_PTR(-EEXIST);
c66ac9db
NB		 591 }
592 spin_unlock(&hba->device_lock);
593
594 if (pscsi_pmode_enable_hba(hba, 1) != 1)
613640e4 595 return ERR_PTR(-ENODEV);
c66ac9db
NB		 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);
613640e4 605 return ERR_PTR(-ENODEV);
c66ac9db
NB		 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");
613640e4 612 return ERR_PTR(-EEXIST);
c66ac9db
NB		 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;
613640e4 647 return ERR_PTR(-ENODEV);
c66ac9db
NB		 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
613640e4 663 return ERR_PTR(-ENODEV);
c66ac9db
NB		 664}
665
666/* pscsi_free_device(): (Part of se_subsystem_api_t template)
667 *
668 *
669 */
670static 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
703static 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 */
713static 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 }
745after_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 }
788after_mode_select:
789
790 if (status_byte(result) & CHECK_CONDITION)
791 return 1;
792
793 return 0;
794}
795
796static struct se_task *
797pscsi_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");
8fc1858a 819 kfree(pt);
c66ac9db
NB		 820 return NULL;
821 }
822 } else
823 pt->pscsi_cdb = &pt->__pscsi_cdb[0];
824
825 return &pt->pscsi_task;
826}
827
828static 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*/
866static 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 */
891static 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
917static 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
935enum {
936 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
937 Opt_scsi_lun_id, Opt_err
938};
939
940static 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
948static 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
1014out:
1015 kfree(orig);
1016 return (!ret) ? count : ret;
1017}
1018
1019static 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
1036static 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
1085static void pscsi_bi_endio(struct bio *bio, int error)
1086{
1087 bio_put(bio);
1088}
1089
1090static 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
1113static 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;
1252fail:
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
1262static 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 */
1289static 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
1312static 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 */
1321static 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 */
1332static 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 */
1343static 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 */
1355static 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
1363static 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 */
1378static 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
1409static 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
1428static 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
1455static int __init pscsi_module_init(void)
1456{
1457 return transport_subsystem_register(&pscsi_template);
1458}
1459
1460static void pscsi_module_exit(void)
1461{
1462 transport_subsystem_release(&pscsi_template);
1463}
1464
1465MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1466MODULE_AUTHOR("nab@Linux-iSCSI.org");
1467MODULE_LICENSE("GPL");
1468
1469module_init(pscsi_module_init);
1470module_exit(pscsi_module_exit);
Linux kernel - Deliverables
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