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target: fix use-after-free with PSCSI sense data
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_pscsi.c
CommitLineData
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
c66ac9db
NB		 29#include <linux/string.h>
30#include <linux/parser.h>
31#include <linux/timer.h>
32#include <linux/blkdev.h>
33#include <linux/blk_types.h>
34#include <linux/slab.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/genhd.h>
37#include <linux/cdrom.h>
d6e0175c 38#include <linux/ratelimit.h>
827509e3 39#include <linux/module.h>
d6e0175c
CH		 40#include <asm/unaligned.h>
41
c66ac9db
NB		 42#include <scsi/scsi.h>
43#include <scsi/scsi_device.h>
44#include <scsi/scsi_cmnd.h>
45#include <scsi/scsi_host.h>
e66ecd50 46#include <scsi/scsi_tcq.h>
c66ac9db
NB		 47
48#include <target/target_core_base.h>
c4795fb2 49#include <target/target_core_backend.h>
c66ac9db 50
d6e0175c 51#include "target_core_alua.h"
c66ac9db
NB		 52#include "target_core_pscsi.h"
53
54#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
55
56static struct se_subsystem_api pscsi_template;
57
0c2ad7d1 58static int pscsi_execute_cmd(struct se_cmd *cmd);
c66ac9db
NB		 59static void pscsi_req_done(struct request *, int);
60
c66ac9db
NB		 61/* pscsi_attach_hba():
62 *
63 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
64 * from the passed SCSI Host ID.
65 */
66static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
67{
c66ac9db
NB		 68 struct pscsi_hba_virt *phv;
69
70 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
6708bb27
AG		 71 if (!phv) {
72 pr_err("Unable to allocate struct pscsi_hba_virt\n");
e3d6f909 73 return -ENOMEM;
c66ac9db
NB		 74 }
75 phv->phv_host_id = host_id;
e6a8a41a 76 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
c66ac9db 77
5951146d 78 hba->hba_ptr = phv;
c66ac9db 79
6708bb27 80 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
c66ac9db
NB		 81 " Generic Target Core Stack %s\n", hba->hba_id,
82 PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
6708bb27 83 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
e3d6f909 84 hba->hba_id);
c66ac9db
NB		 85
86 return 0;
87}
88
89static void pscsi_detach_hba(struct se_hba *hba)
90{
91 struct pscsi_hba_virt *phv = hba->hba_ptr;
92 struct Scsi_Host *scsi_host = phv->phv_lld_host;
93
94 if (scsi_host) {
95 scsi_host_put(scsi_host);
96
6708bb27 97 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
c66ac9db
NB		 98 " Generic Target Core\n", hba->hba_id,
99 (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
100 "Unknown");
101 } else
6708bb27 102 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
c66ac9db
NB		 103 " from Generic Target Core\n", hba->hba_id);
104
105 kfree(phv);
106 hba->hba_ptr = NULL;
107}
108
109static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
110{
8359cf43 111 struct pscsi_hba_virt *phv = hba->hba_ptr;
c66ac9db 112 struct Scsi_Host *sh = phv->phv_lld_host;
c66ac9db
NB		 113 /*
114 * Release the struct Scsi_Host
115 */
6708bb27
AG		 116 if (!mode_flag) {
117 if (!sh)
c66ac9db
NB		 118 return 0;
119
120 phv->phv_lld_host = NULL;
e6a8a41a 121 phv->phv_mode = PHV_VIRTUAL_HOST_ID;
c66ac9db 122
6708bb27 123 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
c66ac9db
NB		 124 " %s\n", hba->hba_id, (sh->hostt->name) ?
125 (sh->hostt->name) : "Unknown");
126
127 scsi_host_put(sh);
128 return 0;
129 }
130 /*
131 * Otherwise, locate struct Scsi_Host from the original passed
132 * pSCSI Host ID and enable for phba mode
133 */
e3d6f909
AG		 134 sh = scsi_host_lookup(phv->phv_host_id);
135 if (IS_ERR(sh)) {
6708bb27 136 pr_err("pSCSI: Unable to locate SCSI Host for"
c66ac9db 137 " phv_host_id: %d\n", phv->phv_host_id);
e3d6f909 138 return PTR_ERR(sh);
c66ac9db 139 }
c66ac9db
NB		 140
141 phv->phv_lld_host = sh;
142 phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
143
6708bb27 144 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
c66ac9db
NB		 145 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
146
147 return 1;
148}
149
150static void pscsi_tape_read_blocksize(struct se_device *dev,
151 struct scsi_device *sdev)
152{
153 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
154 int ret;
155
156 buf = kzalloc(12, GFP_KERNEL);
157 if (!buf)
158 return;
159
160 memset(cdb, 0, MAX_COMMAND_SIZE);
161 cdb[0] = MODE_SENSE;
162 cdb[4] = 0x0c; /* 12 bytes */
163
164 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
165 HZ, 1, NULL);
166 if (ret)
167 goto out_free;
168
169 /*
170 * If MODE_SENSE still returns zero, set the default value to 1024.
171 */
172 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
173 if (!sdev->sector_size)
174 sdev->sector_size = 1024;
175out_free:
176 kfree(buf);
177}
178
179static void
180pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
181{
182 unsigned char *buf;
183
184 if (sdev->inquiry_len < INQUIRY_LEN)
185 return;
186
187 buf = sdev->inquiry;
188 if (!buf)
189 return;
190 /*
191 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
192 */
193 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
194 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
195 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
196}
197
198static int
199pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
200{
201 unsigned char cdb[MAX_COMMAND_SIZE], *buf;
202 int ret;
203
204 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
205 if (!buf)
e3d6f909 206 return -ENOMEM;
c66ac9db
NB		 207
208 memset(cdb, 0, MAX_COMMAND_SIZE);
209 cdb[0] = INQUIRY;
210 cdb[1] = 0x01; /* Query VPD */
211 cdb[2] = 0x80; /* Unit Serial Number */
212 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
213 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
214
215 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
216 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
217 if (ret)
218 goto out_free;
219
220 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
221
222 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
223
224 kfree(buf);
225 return 0;
226
227out_free:
228 kfree(buf);
e3d6f909 229 return -EPERM;
c66ac9db
NB		 230}
231
232static void
233pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
234 struct t10_wwn *wwn)
235{
236 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
237 int ident_len, page_len, off = 4, ret;
238 struct t10_vpd *vpd;
239
240 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
241 if (!buf)
242 return;
243
244 memset(cdb, 0, MAX_COMMAND_SIZE);
245 cdb[0] = INQUIRY;
246 cdb[1] = 0x01; /* Query VPD */
247 cdb[2] = 0x83; /* Device Identifier */
248 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
249 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
250
251 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
252 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
253 NULL, HZ, 1, NULL);
254 if (ret)
255 goto out;
256
257 page_len = (buf[2] << 8) | buf[3];
258 while (page_len > 0) {
259 /* Grab a pointer to the Identification descriptor */
260 page_83 = &buf[off];
261 ident_len = page_83[3];
262 if (!ident_len) {
6708bb27 263 pr_err("page_83[3]: identifier"
c66ac9db
NB		 264 " length zero!\n");
265 break;
266 }
6708bb27 267 pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
c66ac9db
NB		 268
269 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
270 if (!vpd) {
6708bb27 271 pr_err("Unable to allocate memory for"
c66ac9db
NB		 272 " struct t10_vpd\n");
273 goto out;
274 }
275 INIT_LIST_HEAD(&vpd->vpd_list);
276
277 transport_set_vpd_proto_id(vpd, page_83);
278 transport_set_vpd_assoc(vpd, page_83);
279
280 if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
281 off += (ident_len + 4);
282 page_len -= (ident_len + 4);
283 kfree(vpd);
284 continue;
285 }
286 if (transport_set_vpd_ident(vpd, page_83) < 0) {
287 off += (ident_len + 4);
288 page_len -= (ident_len + 4);
289 kfree(vpd);
290 continue;
291 }
292
293 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
294 off += (ident_len + 4);
295 page_len -= (ident_len + 4);
296 }
297
298out:
299 kfree(buf);
300}
301
302/* pscsi_add_device_to_list():
303 *
304 *
305 */
306static struct se_device *pscsi_add_device_to_list(
307 struct se_hba *hba,
308 struct se_subsystem_dev *se_dev,
309 struct pscsi_dev_virt *pdv,
310 struct scsi_device *sd,
311 int dev_flags)
312{
313 struct se_device *dev;
314 struct se_dev_limits dev_limits;
315 struct request_queue *q;
316 struct queue_limits *limits;
317
318 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
319
320 if (!sd->queue_depth) {
321 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
322
6708bb27 323 pr_err("Set broken SCSI Device %d:%d:%d"
c66ac9db
NB		 324 " queue_depth to %d\n", sd->channel, sd->id,
325 sd->lun, sd->queue_depth);
326 }
327 /*
328 * Setup the local scope queue_limits from struct request_queue->limits
329 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
330 */
331 q = sd->request_queue;
332 limits = &dev_limits.limits;
333 limits->logical_block_size = sd->sector_size;
a1d8b49a
AG		 334 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
335 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
c66ac9db
NB		 336 dev_limits.hw_queue_depth = sd->queue_depth;
337 dev_limits.queue_depth = sd->queue_depth;
338 /*
339 * Setup our standard INQUIRY info into se_dev->t10_wwn
340 */
341 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
342
343 /*
344 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
345 * which has already been referenced with Linux SCSI code with
346 * scsi_device_get() in this file's pscsi_create_virtdevice().
347 *
348 * The passthrough operations called by the transport_add_device_*
349 * function below will require this pointer to be set for passthroug
350 * ops.
351 *
352 * For the shutdown case in pscsi_free_device(), this struct
353 * scsi_device reference is released with Linux SCSI code
354 * scsi_device_put() and the pdv->pdv_sd cleared.
355 */
356 pdv->pdv_sd = sd;
c66ac9db 357 dev = transport_add_device_to_core_hba(hba, &pscsi_template,
5951146d 358 se_dev, dev_flags, pdv,
c66ac9db 359 &dev_limits, NULL, NULL);
6708bb27 360 if (!dev) {
c66ac9db
NB		 361 pdv->pdv_sd = NULL;
362 return NULL;
363 }
364
365 /*
366 * Locate VPD WWN Information used for various purposes within
367 * the Storage Engine.
368 */
369 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
370 /*
371 * If VPD Unit Serial returned GOOD status, try
372 * VPD Device Identification page (0x83).
373 */
374 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
375 }
376
377 /*
378 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
379 */
380 if (sd->type == TYPE_TAPE)
381 pscsi_tape_read_blocksize(dev, sd);
382 return dev;
383}
384
385static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
386{
387 struct pscsi_dev_virt *pdv;
388
389 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
6708bb27
AG		 390 if (!pdv) {
391 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
c66ac9db
NB		 392 return NULL;
393 }
394 pdv->pdv_se_hba = hba;
395
6708bb27 396 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
5951146d 397 return pdv;
c66ac9db
NB		 398}
399
400/*
401 * Called with struct Scsi_Host->host_lock called.
402 */
403static struct se_device *pscsi_create_type_disk(
404 struct scsi_device *sd,
405 struct pscsi_dev_virt *pdv,
406 struct se_subsystem_dev *se_dev,
407 struct se_hba *hba)
5dd7ed2e 408 __releases(sh->host_lock)
c66ac9db
NB		 409{
410 struct se_device *dev;
8359cf43 411 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
c66ac9db
NB		 412 struct Scsi_Host *sh = sd->host;
413 struct block_device *bd;
414 u32 dev_flags = 0;
415
416 if (scsi_device_get(sd)) {
6708bb27 417 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
c66ac9db
NB		 418 sh->host_no, sd->channel, sd->id, sd->lun);
419 spin_unlock_irq(sh->host_lock);
420 return NULL;
421 }
422 spin_unlock_irq(sh->host_lock);
423 /*
424 * Claim exclusive struct block_device access to struct scsi_device
425 * for TYPE_DISK using supplied udev_path
426 */
427 bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
428 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
3ae279d2 429 if (IS_ERR(bd)) {
6708bb27 430 pr_err("pSCSI: blkdev_get_by_path() failed\n");
c66ac9db
NB		 431 scsi_device_put(sd);
432 return NULL;
433 }
434 pdv->pdv_bd = bd;
435
436 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
6708bb27 437 if (!dev) {
c66ac9db
NB		 438 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
439 scsi_device_put(sd);
440 return NULL;
441 }
6708bb27 442 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
c66ac9db
NB		 443 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
444
445 return dev;
446}
447
448/*
449 * Called with struct Scsi_Host->host_lock called.
450 */
451static struct se_device *pscsi_create_type_rom(
452 struct scsi_device *sd,
453 struct pscsi_dev_virt *pdv,
454 struct se_subsystem_dev *se_dev,
455 struct se_hba *hba)
5dd7ed2e 456 __releases(sh->host_lock)
c66ac9db
NB		 457{
458 struct se_device *dev;
8359cf43 459 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
c66ac9db
NB		 460 struct Scsi_Host *sh = sd->host;
461 u32 dev_flags = 0;
462
463 if (scsi_device_get(sd)) {
6708bb27 464 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
c66ac9db
NB		 465 sh->host_no, sd->channel, sd->id, sd->lun);
466 spin_unlock_irq(sh->host_lock);
467 return NULL;
468 }
469 spin_unlock_irq(sh->host_lock);
470
471 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
6708bb27 472 if (!dev) {
c66ac9db
NB		 473 scsi_device_put(sd);
474 return NULL;
475 }
6708bb27 476 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
c66ac9db
NB		 477 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
478 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_other(
487 struct scsi_device *sd,
488 struct pscsi_dev_virt *pdv,
489 struct se_subsystem_dev *se_dev,
490 struct se_hba *hba)
5dd7ed2e 491 __releases(sh->host_lock)
c66ac9db
NB		 492{
493 struct se_device *dev;
8359cf43 494 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
c66ac9db
NB		 495 struct Scsi_Host *sh = sd->host;
496 u32 dev_flags = 0;
497
498 spin_unlock_irq(sh->host_lock);
499 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
6708bb27 500 if (!dev)
c66ac9db
NB		 501 return NULL;
502
6708bb27 503 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
c66ac9db
NB		 504 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
505 sd->channel, sd->id, sd->lun);
506
507 return dev;
508}
509
510static struct se_device *pscsi_create_virtdevice(
511 struct se_hba *hba,
512 struct se_subsystem_dev *se_dev,
513 void *p)
514{
8359cf43 515 struct pscsi_dev_virt *pdv = p;
c66ac9db
NB		 516 struct se_device *dev;
517 struct scsi_device *sd;
8359cf43 518 struct pscsi_hba_virt *phv = hba->hba_ptr;
c66ac9db
NB		 519 struct Scsi_Host *sh = phv->phv_lld_host;
520 int legacy_mode_enable = 0;
521
6708bb27
AG		 522 if (!pdv) {
523 pr_err("Unable to locate struct pscsi_dev_virt"
c66ac9db 524 " parameter\n");
613640e4 525 return ERR_PTR(-EINVAL);
c66ac9db
NB		 526 }
527 /*
528 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
529 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
530 */
6708bb27 531 if (!sh) {
c66ac9db 532 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
6708bb27 533 pr_err("pSCSI: Unable to locate struct"
c66ac9db 534 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
613640e4 535 return ERR_PTR(-ENODEV);
c66ac9db
NB		 536 }
537 /*
e6a8a41a 538 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
c66ac9db
NB		 539 * reference, we enforce that udev_path has been set
540 */
541 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
6708bb27 542 pr_err("pSCSI: udev_path attribute has not"
c66ac9db 543 " been set before ENABLE=1\n");
613640e4 544 return ERR_PTR(-EINVAL);
c66ac9db
NB		 545 }
546 /*
e6a8a41a 547 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
c66ac9db
NB		 548 * use the original TCM hba ID to reference Linux/SCSI Host No
549 * and enable for PHV_LLD_SCSI_HOST_NO mode.
550 */
551 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
552 spin_lock(&hba->device_lock);
6708bb27
AG		 553 if (!list_empty(&hba->hba_dev_list)) {
554 pr_err("pSCSI: Unable to set hba_mode"
c66ac9db
NB		 555 " with active devices\n");
556 spin_unlock(&hba->device_lock);
613640e4 557 return ERR_PTR(-EEXIST);
c66ac9db
NB		 558 }
559 spin_unlock(&hba->device_lock);
560
561 if (pscsi_pmode_enable_hba(hba, 1) != 1)
613640e4 562 return ERR_PTR(-ENODEV);
c66ac9db
NB		 563
564 legacy_mode_enable = 1;
565 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
566 sh = phv->phv_lld_host;
567 } else {
e3d6f909
AG		 568 sh = scsi_host_lookup(pdv->pdv_host_id);
569 if (IS_ERR(sh)) {
6708bb27 570 pr_err("pSCSI: Unable to locate"
c66ac9db 571 " pdv_host_id: %d\n", pdv->pdv_host_id);
942d8264 572 return ERR_CAST(sh);
c66ac9db
NB		 573 }
574 }
575 } else {
e6a8a41a
SH		 576 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
577 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
c66ac9db 578 " struct Scsi_Host exists\n");
613640e4 579 return ERR_PTR(-EEXIST);
c66ac9db
NB		 580 }
581 }
582
583 spin_lock_irq(sh->host_lock);
584 list_for_each_entry(sd, &sh->__devices, siblings) {
585 if ((pdv->pdv_channel_id != sd->channel) ||
586 (pdv->pdv_target_id != sd->id) ||
587 (pdv->pdv_lun_id != sd->lun))
588 continue;
589 /*
590 * Functions will release the held struct scsi_host->host_lock
591 * before calling calling pscsi_add_device_to_list() to register
592 * struct scsi_device with target_core_mod.
593 */
594 switch (sd->type) {
595 case TYPE_DISK:
596 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
597 break;
598 case TYPE_ROM:
599 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
600 break;
601 default:
602 dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
603 break;
604 }
605
6708bb27 606 if (!dev) {
e6a8a41a 607 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
c66ac9db
NB		 608 scsi_host_put(sh);
609 else if (legacy_mode_enable) {
610 pscsi_pmode_enable_hba(hba, 0);
611 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
612 }
613 pdv->pdv_sd = NULL;
613640e4 614 return ERR_PTR(-ENODEV);
c66ac9db
NB		 615 }
616 return dev;
617 }
618 spin_unlock_irq(sh->host_lock);
619
6708bb27 620 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
c66ac9db
NB		 621 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
622
e6a8a41a 623 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
c66ac9db
NB		 624 scsi_host_put(sh);
625 else if (legacy_mode_enable) {
626 pscsi_pmode_enable_hba(hba, 0);
627 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
628 }
629
613640e4 630 return ERR_PTR(-ENODEV);
c66ac9db
NB		 631}
632
633/* pscsi_free_device(): (Part of se_subsystem_api_t template)
634 *
635 *
636 */
637static void pscsi_free_device(void *p)
638{
639 struct pscsi_dev_virt *pdv = p;
640 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
641 struct scsi_device *sd = pdv->pdv_sd;
642
643 if (sd) {
644 /*
645 * Release exclusive pSCSI internal struct block_device claim for
646 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
647 */
648 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
649 blkdev_put(pdv->pdv_bd,
650 FMODE_WRITE|FMODE_READ|FMODE_EXCL);
651 pdv->pdv_bd = NULL;
652 }
653 /*
654 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
655 * to struct Scsi_Host now.
656 */
657 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
658 (phv->phv_lld_host != NULL))
659 scsi_host_put(phv->phv_lld_host);
660
661 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
662 scsi_device_put(sd);
663
664 pdv->pdv_sd = NULL;
665 }
666
667 kfree(pdv);
668}
669
d5829eac
PB		 670static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
671 unsigned char *sense_buffer)
c66ac9db 672{
5787cacd 673 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
c66ac9db
NB		 674 struct scsi_device *sd = pdv->pdv_sd;
675 int result;
5787cacd 676 struct pscsi_plugin_task *pt = cmd->priv;
1d2a2cd9
NB		 677 unsigned char *cdb;
678 /*
679 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
680 * not been allocated because TCM is handling the emulation directly.
681 */
682 if (!pt)
d5829eac 683 return;
c66ac9db 684
1d2a2cd9 685 cdb = &pt->pscsi_cdb[0];
c66ac9db
NB		 686 result = pt->pscsi_result;
687 /*
688 * Hack to make sure that Write-Protect modepage is set if R/O mode is
689 * forced.
690 */
691 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
692 (status_byte(result) << 1) == SAM_STAT_GOOD) {
5787cacd 693 if (!cmd->se_deve)
c66ac9db
NB		 694 goto after_mode_sense;
695
5787cacd
CH		 696 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
697 unsigned char *buf = transport_kmap_data_sg(cmd);
c66ac9db
NB		 698
699 if (cdb[0] == MODE_SENSE_10) {
700 if (!(buf[3] & 0x80))
701 buf[3] |= 0x80;
702 } else {
703 if (!(buf[2] & 0x80))
704 buf[2] |= 0x80;
705 }
05d1c7c0 706
5787cacd 707 transport_kunmap_data_sg(cmd);
c66ac9db
NB		 708 }
709 }
710after_mode_sense:
711
712 if (sd->type != TYPE_TAPE)
713 goto after_mode_select;
714
715 /*
716 * Hack to correctly obtain the initiator requested blocksize for
717 * TYPE_TAPE. Since this value is dependent upon each tape media,
718 * struct scsi_device->sector_size will not contain the correct value
719 * by default, so we go ahead and set it so
720 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
721 * storage engine.
722 */
723 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
724 (status_byte(result) << 1) == SAM_STAT_GOOD) {
725 unsigned char *buf;
c66ac9db
NB		 726 u16 bdl;
727 u32 blocksize;
728
729 buf = sg_virt(&sg[0]);
6708bb27
AG		 730 if (!buf) {
731 pr_err("Unable to get buf for scatterlist\n");
c66ac9db
NB		 732 goto after_mode_select;
733 }
734
735 if (cdb[0] == MODE_SELECT)
736 bdl = (buf[3]);
737 else
738 bdl = (buf[6] << 8) | (buf[7]);
739
740 if (!bdl)
741 goto after_mode_select;
742
743 if (cdb[0] == MODE_SELECT)
744 blocksize = (buf[9] << 16) | (buf[10] << 8) |
745 (buf[11]);
746 else
747 blocksize = (buf[13] << 16) | (buf[14] << 8) |
748 (buf[15]);
749
750 sd->sector_size = blocksize;
751 }
752after_mode_select:
753
d5829eac
PB		 754 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
755 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
756 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
757 }
c66ac9db
NB		 758}
759
c66ac9db
NB		 760enum {
761 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
762 Opt_scsi_lun_id, Opt_err
763};
764
765static match_table_t tokens = {
766 {Opt_scsi_host_id, "scsi_host_id=%d"},
767 {Opt_scsi_channel_id, "scsi_channel_id=%d"},
768 {Opt_scsi_target_id, "scsi_target_id=%d"},
769 {Opt_scsi_lun_id, "scsi_lun_id=%d"},
770 {Opt_err, NULL}
771};
772
773static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
774 struct se_subsystem_dev *se_dev,
775 const char *page,
776 ssize_t count)
777{
778 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
779 struct pscsi_hba_virt *phv = hba->hba_ptr;
780 char *orig, *ptr, *opts;
781 substring_t args[MAX_OPT_ARGS];
782 int ret = 0, arg, token;
783
784 opts = kstrdup(page, GFP_KERNEL);
785 if (!opts)
786 return -ENOMEM;
787
788 orig = opts;
789
90c161b6 790 while ((ptr = strsep(&opts, ",\n")) != NULL) {
c66ac9db
NB		 791 if (!*ptr)
792 continue;
793
794 token = match_token(ptr, tokens, args);
795 switch (token) {
796 case Opt_scsi_host_id:
797 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
6708bb27 798 pr_err("PSCSI[%d]: Unable to accept"
c66ac9db
NB		 799 " scsi_host_id while phv_mode =="
800 " PHV_LLD_SCSI_HOST_NO\n",
801 phv->phv_host_id);
802 ret = -EINVAL;
803 goto out;
804 }
805 match_int(args, &arg);
806 pdv->pdv_host_id = arg;
6708bb27 807 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
c66ac9db
NB		 808 " %d\n", phv->phv_host_id, pdv->pdv_host_id);
809 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
810 break;
811 case Opt_scsi_channel_id:
812 match_int(args, &arg);
813 pdv->pdv_channel_id = arg;
6708bb27 814 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
c66ac9db
NB		 815 " ID: %d\n", phv->phv_host_id,
816 pdv->pdv_channel_id);
817 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
818 break;
819 case Opt_scsi_target_id:
820 match_int(args, &arg);
821 pdv->pdv_target_id = arg;
6708bb27 822 pr_debug("PSCSI[%d]: Referencing SCSI Target"
c66ac9db
NB		 823 " ID: %d\n", phv->phv_host_id,
824 pdv->pdv_target_id);
825 pdv->pdv_flags |= PDF_HAS_TARGET_ID;
826 break;
827 case Opt_scsi_lun_id:
828 match_int(args, &arg);
829 pdv->pdv_lun_id = arg;
6708bb27 830 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
c66ac9db
NB		 831 " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
832 pdv->pdv_flags |= PDF_HAS_LUN_ID;
833 break;
834 default:
835 break;
836 }
837 }
838
839out:
840 kfree(orig);
841 return (!ret) ? count : ret;
842}
843
844static ssize_t pscsi_check_configfs_dev_params(
845 struct se_hba *hba,
846 struct se_subsystem_dev *se_dev)
847{
848 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
849
850 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
851 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
852 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
6708bb27 853 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
c66ac9db 854 " scsi_lun_id= parameters\n");
e3d6f909 855 return -EINVAL;
c66ac9db
NB		 856 }
857
858 return 0;
859}
860
861static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
862 struct se_subsystem_dev *se_dev,
863 char *b)
864{
865 struct pscsi_hba_virt *phv = hba->hba_ptr;
866 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
867 struct scsi_device *sd = pdv->pdv_sd;
868 unsigned char host_id[16];
869 ssize_t bl;
870 int i;
871
e6a8a41a 872 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
c66ac9db
NB		 873 snprintf(host_id, 16, "%d", pdv->pdv_host_id);
874 else
875 snprintf(host_id, 16, "PHBA Mode");
876
877 bl = sprintf(b, "SCSI Device Bus Location:"
878 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
879 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
880 host_id);
881
882 if (sd) {
883 bl += sprintf(b + bl, " ");
884 bl += sprintf(b + bl, "Vendor: ");
885 for (i = 0; i < 8; i++) {
886 if (ISPRINT(sd->vendor[i])) /* printable character? */
887 bl += sprintf(b + bl, "%c", sd->vendor[i]);
888 else
889 bl += sprintf(b + bl, " ");
890 }
891 bl += sprintf(b + bl, " Model: ");
892 for (i = 0; i < 16; i++) {
893 if (ISPRINT(sd->model[i])) /* printable character ? */
894 bl += sprintf(b + bl, "%c", sd->model[i]);
895 else
896 bl += sprintf(b + bl, " ");
897 }
898 bl += sprintf(b + bl, " Rev: ");
899 for (i = 0; i < 4; i++) {
900 if (ISPRINT(sd->rev[i])) /* printable character ? */
901 bl += sprintf(b + bl, "%c", sd->rev[i]);
902 else
903 bl += sprintf(b + bl, " ");
904 }
905 bl += sprintf(b + bl, "\n");
906 }
907 return bl;
908}
909
910static void pscsi_bi_endio(struct bio *bio, int error)
911{
912 bio_put(bio);
913}
914
a1d8b49a 915static inline struct bio *pscsi_get_bio(int sg_num)
c66ac9db
NB		 916{
917 struct bio *bio;
918 /*
919 * Use bio_malloc() following the comment in for bio -> struct request
920 * in block/blk-core.c:blk_make_request()
921 */
922 bio = bio_kmalloc(GFP_KERNEL, sg_num);
6708bb27
AG		 923 if (!bio) {
924 pr_err("PSCSI: bio_kmalloc() failed\n");
c66ac9db
NB		 925 return NULL;
926 }
927 bio->bi_end_io = pscsi_bi_endio;
928
929 return bio;
930}
931
5787cacd
CH		 932static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl,
933 u32 sgl_nents, enum dma_data_direction data_direction,
02b1a746 934 struct bio **hbio)
c66ac9db 935{
5787cacd 936 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
02b1a746 937 struct bio *bio = NULL, *tbio = NULL;
c66ac9db
NB		 938 struct page *page;
939 struct scatterlist *sg;
7a83aa4e 940 u32 data_len = cmd->data_length, i, len, bytes, off;
5787cacd 941 int nr_pages = (cmd->data_length + sgl[0].offset +
c66ac9db 942 PAGE_SIZE - 1) >> PAGE_SHIFT;
03e98c9e 943 int nr_vecs = 0, rc;
5787cacd 944 int rw = (data_direction == DMA_TO_DEVICE);
c66ac9db 945
02b1a746
CH		 946 *hbio = NULL;
947
6708bb27 948 pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
c66ac9db 949
5787cacd 950 for_each_sg(sgl, sg, sgl_nents, i) {
c66ac9db
NB		 951 page = sg_page(sg);
952 off = sg->offset;
953 len = sg->length;
954
6708bb27 955 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
c66ac9db
NB		 956 page, len, off);
957
958 while (len > 0 && data_len > 0) {
959 bytes = min_t(unsigned int, len, PAGE_SIZE - off);
960 bytes = min(bytes, data_len);
961
6708bb27 962 if (!bio) {
c66ac9db
NB		 963 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
964 nr_pages -= nr_vecs;
965 /*
966 * Calls bio_kmalloc() and sets bio->bi_end_io()
967 */
a1d8b49a 968 bio = pscsi_get_bio(nr_vecs);
6708bb27 969 if (!bio)
c66ac9db
NB		 970 goto fail;
971
972 if (rw)
973 bio->bi_rw |= REQ_WRITE;
974
6708bb27 975 pr_debug("PSCSI: Allocated bio: %p,"
c66ac9db
NB		 976 " dir: %s nr_vecs: %d\n", bio,
977 (rw) ? "rw" : "r", nr_vecs);
978 /*
979 * Set *hbio pointer to handle the case:
980 * nr_pages > BIO_MAX_PAGES, where additional
981 * bios need to be added to complete a given
5787cacd 982 * command.
c66ac9db 983 */
02b1a746
CH		 984 if (!*hbio)
985 *hbio = tbio = bio;
c66ac9db
NB		 986 else
987 tbio = tbio->bi_next = bio;
988 }
989
6708bb27 990 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
c66ac9db
NB		 991 " bio: %p page: %p len: %d off: %d\n", i, bio,
992 page, len, off);
993
994 rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
995 bio, page, bytes, off);
996 if (rc != bytes)
997 goto fail;
998
6708bb27 999 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
c66ac9db
NB		 1000 bio->bi_vcnt, nr_vecs);
1001
1002 if (bio->bi_vcnt > nr_vecs) {
6708bb27 1003 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
c66ac9db
NB		 1004 " %d i: %d bio: %p, allocating another"
1005 " bio\n", bio->bi_vcnt, i, bio);
1006 /*
1007 * Clear the pointer so that another bio will
1008 * be allocated with pscsi_get_bio() above, the
1009 * current bio has already been set *tbio and
1010 * bio->bi_next.
1011 */
1012 bio = NULL;
1013 }
1014
1015 page++;
1016 len -= bytes;
1017 data_len -= bytes;
1018 off = 0;
1019 }
1020 }
c66ac9db 1021
5787cacd 1022 return sgl_nents;
c66ac9db 1023fail:
02b1a746
CH		 1024 while (*hbio) {
1025 bio = *hbio;
1026 *hbio = (*hbio)->bi_next;
c66ac9db 1027 bio->bi_next = NULL;
02b1a746 1028 bio_endio(bio, 0); /* XXX: should be error */
c66ac9db 1029 }
03e98c9e
NB		 1030 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1031 return -ENOMEM;
c66ac9db
NB		 1032}
1033
3d6d7201
CH		 1034/*
1035 * Clear a lun set in the cdb if the initiator talking to use spoke
1036 * and old standards version, as we can't assume the underlying device
1037 * won't choke up on it.
1038 */
1039static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1040{
1041 switch (cdb[0]) {
1042 case READ_10: /* SBC - RDProtect */
1043 case READ_12: /* SBC - RDProtect */
1044 case READ_16: /* SBC - RDProtect */
1045 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046 case VERIFY: /* SBC - VRProtect */
1047 case VERIFY_16: /* SBC - VRProtect */
1048 case WRITE_VERIFY: /* SBC - VRProtect */
1049 case WRITE_VERIFY_12: /* SBC - VRProtect */
1050 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051 break;
1052 default:
1053 cdb[1] &= 0x1f; /* clear logical unit number */
1054 break;
1055 }
1056}
1057
1fd032ee 1058static int pscsi_parse_cdb(struct se_cmd *cmd)
d6e0175c 1059{
1fd032ee
CH		 1060 unsigned char *cdb = cmd->t_task_cdb;
1061 unsigned int dummy_size;
1062 int ret;
d6e0175c 1063
1fd032ee
CH		 1064 if (cmd->se_cmd_flags & SCF_BIDI) {
1065 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1066 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1067 return -EINVAL;
d6e0175c
CH		 1068 }
1069
3d6d7201
CH		 1070 pscsi_clear_cdb_lun(cdb);
1071
d6e0175c 1072 /*
a3785c87
NB		 1073 * For REPORT LUNS we always need to emulate the response, for everything
1074 * else the default for pSCSI is to pass the command to the underlying
1075 * LLD / physical hardware.
d6e0175c 1076 */
d6e0175c 1077 switch (cdb[0]) {
1fd032ee 1078 case REPORT_LUNS:
1fd032ee
CH		 1079 ret = spc_parse_cdb(cmd, &dummy_size);
1080 if (ret)
1081 return ret;
d6e0175c 1082 break;
1fd032ee 1083 case READ_6:
d6e0175c 1084 case READ_10:
d6e0175c 1085 case READ_12:
d6e0175c 1086 case READ_16:
d6e0175c 1087 case WRITE_6:
d6e0175c 1088 case WRITE_10:
d6e0175c 1089 case WRITE_12:
d6e0175c 1090 case WRITE_16:
1fd032ee 1091 case WRITE_VERIFY:
d6e0175c 1092 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
0c2ad7d1 1093 /* FALLTHROUGH*/
d6e0175c 1094 default:
0c2ad7d1 1095 cmd->execute_cmd = pscsi_execute_cmd;
1fd032ee 1096 break;
d6e0175c
CH		 1097 }
1098
1099 return 0;
d6e0175c
CH		 1100}
1101
0c2ad7d1 1102static int pscsi_execute_cmd(struct se_cmd *cmd)
c66ac9db 1103{
0c2ad7d1
CH		 1104 struct scatterlist *sgl = cmd->t_data_sg;
1105 u32 sgl_nents = cmd->t_data_nents;
1106 enum dma_data_direction data_direction = cmd->data_direction;
5787cacd
CH		 1107 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1108 struct pscsi_plugin_task *pt;
02b1a746
CH		 1109 struct request *req;
1110 struct bio *hbio;
c66ac9db
NB		 1111 int ret;
1112
5787cacd
CH		 1113 /*
1114 * Dynamically alloc cdb space, since it may be larger than
1115 * TCM_MAX_COMMAND_SIZE
1116 */
1117 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1118 if (!pt) {
1119 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1120 return -ENOMEM;
1121 }
1122 cmd->priv = pt;
1123
ed3102c6
CH		 1124 memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1125 scsi_command_size(cmd->t_task_cdb));
485fd0d1 1126
64f1db38 1127 if (!sgl) {
02b1a746 1128 req = blk_get_request(pdv->pdv_sd->request_queue,
5787cacd 1129 (data_direction == DMA_TO_DEVICE),
02b1a746
CH		 1130 GFP_KERNEL);
1131 if (!req || IS_ERR(req)) {
1132 pr_err("PSCSI: blk_get_request() failed: %ld\n",
1133 req ? IS_ERR(req) : -ENOMEM);
03e98c9e
NB		 1134 cmd->scsi_sense_reason =
1135 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
5787cacd 1136 goto fail;
02b1a746
CH		 1137 }
1138 } else {
7a83aa4e 1139 BUG_ON(!cmd->data_length);
c66ac9db 1140
5787cacd 1141 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
03e98c9e
NB		 1142 if (ret < 0) {
1143 cmd->scsi_sense_reason =
1144 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
5787cacd 1145 goto fail;
03e98c9e 1146 }
02b1a746
CH		 1147
1148 req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1149 GFP_KERNEL);
ed327ed3 1150 if (IS_ERR(req)) {
02b1a746 1151 pr_err("pSCSI: blk_make_request() failed\n");
5787cacd 1152 goto fail_free_bio;
02b1a746 1153 }
c66ac9db
NB		 1154 }
1155
02b1a746
CH		 1156 req->cmd_type = REQ_TYPE_BLOCK_PC;
1157 req->end_io = pscsi_req_done;
5787cacd 1158 req->end_io_data = cmd;
02b1a746
CH		 1159 req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1160 req->cmd = &pt->pscsi_cdb[0];
1161 req->sense = &pt->pscsi_sense[0];
1162 req->sense_len = 0;
1163 if (pdv->pdv_sd->type == TYPE_DISK)
1164 req->timeout = PS_TIMEOUT_DISK;
1165 else
1166 req->timeout = PS_TIMEOUT_OTHER;
1167 req->retries = PS_RETRY;
c66ac9db 1168
02b1a746 1169 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
5787cacd 1170 (cmd->sam_task_attr == MSG_HEAD_TAG),
02b1a746
CH		 1171 pscsi_req_done);
1172
03e98c9e 1173 return 0;
02b1a746 1174
5787cacd 1175fail_free_bio:
02b1a746
CH		 1176 while (hbio) {
1177 struct bio *bio = hbio;
1178 hbio = hbio->bi_next;
1179 bio->bi_next = NULL;
1180 bio_endio(bio, 0); /* XXX: should be error */
1181 }
03e98c9e 1182 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
5787cacd
CH		 1183fail:
1184 kfree(pt);
03e98c9e 1185 return -ENOMEM;
c66ac9db
NB		 1186}
1187
c66ac9db
NB		 1188/* pscsi_get_device_rev():
1189 *
1190 *
1191 */
1192static u32 pscsi_get_device_rev(struct se_device *dev)
1193{
1194 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1195 struct scsi_device *sd = pdv->pdv_sd;
1196
1197 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1198}
1199
1200/* pscsi_get_device_type():
1201 *
1202 *
1203 */
1204static u32 pscsi_get_device_type(struct se_device *dev)
1205{
1206 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1207 struct scsi_device *sd = pdv->pdv_sd;
1208
1209 return sd->type;
1210}
1211
1212static sector_t pscsi_get_blocks(struct se_device *dev)
1213{
1214 struct pscsi_dev_virt *pdv = dev->dev_ptr;
1215
1216 if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1217 return pdv->pdv_bd->bd_part->nr_sects;
1218
1219 dump_stack();
1220 return 0;
1221}
1222
5787cacd 1223static void pscsi_req_done(struct request *req, int uptodate)
c66ac9db 1224{
5787cacd
CH		 1225 struct se_cmd *cmd = req->end_io_data;
1226 struct pscsi_plugin_task *pt = cmd->priv;
1227
1228 pt->pscsi_result = req->errors;
1229 pt->pscsi_resid = req->resid_len;
1230
1231 cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1232 if (cmd->scsi_status) {
1233 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1234 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
c66ac9db
NB		 1235 pt->pscsi_result);
1236 }
1237
1238 switch (host_byte(pt->pscsi_result)) {
1239 case DID_OK:
5787cacd 1240 target_complete_cmd(cmd, cmd->scsi_status);
c66ac9db
NB		 1241 break;
1242 default:
5787cacd
CH		 1243 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1244 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
c66ac9db 1245 pt->pscsi_result);
5787cacd
CH		 1246 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1247 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
c66ac9db
NB		 1248 break;
1249 }
c66ac9db 1250
c66ac9db 1251 __blk_put_request(req->q, req);
5787cacd 1252 kfree(pt);
c66ac9db
NB		 1253}
1254
1255static struct se_subsystem_api pscsi_template = {
1256 .name = "pscsi",
1257 .owner = THIS_MODULE,
1258 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
c66ac9db
NB		 1259 .attach_hba = pscsi_attach_hba,
1260 .detach_hba = pscsi_detach_hba,
1261 .pmode_enable_hba = pscsi_pmode_enable_hba,
1262 .allocate_virtdevice = pscsi_allocate_virtdevice,
1263 .create_virtdevice = pscsi_create_virtdevice,
1264 .free_device = pscsi_free_device,
1265 .transport_complete = pscsi_transport_complete,
d6e0175c 1266 .parse_cdb = pscsi_parse_cdb,
c66ac9db
NB		 1267 .check_configfs_dev_params = pscsi_check_configfs_dev_params,
1268 .set_configfs_dev_params = pscsi_set_configfs_dev_params,
1269 .show_configfs_dev_params = pscsi_show_configfs_dev_params,
c66ac9db
NB		 1270 .get_device_rev = pscsi_get_device_rev,
1271 .get_device_type = pscsi_get_device_type,
1272 .get_blocks = pscsi_get_blocks,
1273};
1274
1275static int __init pscsi_module_init(void)
1276{
1277 return transport_subsystem_register(&pscsi_template);
1278}
1279
1280static void pscsi_module_exit(void)
1281{
1282 transport_subsystem_release(&pscsi_template);
1283}
1284
1285MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1286MODULE_AUTHOR("nab@Linux-iSCSI.org");
1287MODULE_LICENSE("GPL");
1288
1289module_init(pscsi_module_init);
1290module_exit(pscsi_module_exit);
kernel source for telekom puls (alcatel/mediatek)