1 /*******************************************************************************
2 * Filename: target_core_pscsi.c
4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
6 * (c) Copyright 2003-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/string.h>
27 #include <linux/parser.h>
28 #include <linux/timer.h>
29 #include <linux/blkdev.h>
30 #include <linux/blk_types.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/genhd.h>
34 #include <linux/cdrom.h>
35 #include <linux/ratelimit.h>
36 #include <linux/module.h>
37 #include <asm/unaligned.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_tcq.h>
45 #include <target/target_core_base.h>
46 #include <target/target_core_backend.h>
48 #include "target_core_alua.h"
49 #include "target_core_internal.h"
50 #include "target_core_pscsi.h"
52 #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
54 static inline struct pscsi_dev_virt
*PSCSI_DEV(struct se_device
*dev
)
56 return container_of(dev
, struct pscsi_dev_virt
, dev
);
59 static sense_reason_t
pscsi_execute_cmd(struct se_cmd
*cmd
);
60 static void pscsi_req_done(struct request
*, int);
62 /* pscsi_attach_hba():
64 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
65 * from the passed SCSI Host ID.
67 static int pscsi_attach_hba(struct se_hba
*hba
, u32 host_id
)
69 struct pscsi_hba_virt
*phv
;
71 phv
= kzalloc(sizeof(struct pscsi_hba_virt
), GFP_KERNEL
);
73 pr_err("Unable to allocate struct pscsi_hba_virt\n");
76 phv
->phv_host_id
= host_id
;
77 phv
->phv_mode
= PHV_VIRTUAL_HOST_ID
;
81 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
82 " Generic Target Core Stack %s\n", hba
->hba_id
,
83 PSCSI_VERSION
, TARGET_CORE_MOD_VERSION
);
84 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
90 static void pscsi_detach_hba(struct se_hba
*hba
)
92 struct pscsi_hba_virt
*phv
= hba
->hba_ptr
;
93 struct Scsi_Host
*scsi_host
= phv
->phv_lld_host
;
96 scsi_host_put(scsi_host
);
98 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
99 " Generic Target Core\n", hba
->hba_id
,
100 (scsi_host
->hostt
->name
) ? (scsi_host
->hostt
->name
) :
103 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
104 " from Generic Target Core\n", hba
->hba_id
);
110 static int pscsi_pmode_enable_hba(struct se_hba
*hba
, unsigned long mode_flag
)
112 struct pscsi_hba_virt
*phv
= hba
->hba_ptr
;
113 struct Scsi_Host
*sh
= phv
->phv_lld_host
;
115 * Release the struct Scsi_Host
121 phv
->phv_lld_host
= NULL
;
122 phv
->phv_mode
= PHV_VIRTUAL_HOST_ID
;
124 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
125 " %s\n", hba
->hba_id
, (sh
->hostt
->name
) ?
126 (sh
->hostt
->name
) : "Unknown");
132 * Otherwise, locate struct Scsi_Host from the original passed
133 * pSCSI Host ID and enable for phba mode
135 sh
= scsi_host_lookup(phv
->phv_host_id
);
137 pr_err("pSCSI: Unable to locate SCSI Host for"
138 " phv_host_id: %d\n", phv
->phv_host_id
);
142 phv
->phv_lld_host
= sh
;
143 phv
->phv_mode
= PHV_LLD_SCSI_HOST_NO
;
145 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
146 hba
->hba_id
, (sh
->hostt
->name
) ? (sh
->hostt
->name
) : "Unknown");
151 static void pscsi_tape_read_blocksize(struct se_device
*dev
,
152 struct scsi_device
*sdev
)
154 unsigned char cdb
[MAX_COMMAND_SIZE
], *buf
;
157 buf
= kzalloc(12, GFP_KERNEL
);
161 memset(cdb
, 0, MAX_COMMAND_SIZE
);
163 cdb
[4] = 0x0c; /* 12 bytes */
165 ret
= scsi_execute_req(sdev
, cdb
, DMA_FROM_DEVICE
, buf
, 12, NULL
,
171 * If MODE_SENSE still returns zero, set the default value to 1024.
173 sdev
->sector_size
= (buf
[9] << 16) | (buf
[10] << 8) | (buf
[11]);
174 if (!sdev
->sector_size
)
175 sdev
->sector_size
= 1024;
181 pscsi_set_inquiry_info(struct scsi_device
*sdev
, struct t10_wwn
*wwn
)
185 if (sdev
->inquiry_len
< INQUIRY_LEN
)
192 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
194 memcpy(&wwn
->vendor
[0], &buf
[8], sizeof(wwn
->vendor
));
195 memcpy(&wwn
->model
[0], &buf
[16], sizeof(wwn
->model
));
196 memcpy(&wwn
->revision
[0], &buf
[32], sizeof(wwn
->revision
));
200 pscsi_get_inquiry_vpd_serial(struct scsi_device
*sdev
, struct t10_wwn
*wwn
)
202 unsigned char cdb
[MAX_COMMAND_SIZE
], *buf
;
205 buf
= kzalloc(INQUIRY_VPD_SERIAL_LEN
, GFP_KERNEL
);
209 memset(cdb
, 0, MAX_COMMAND_SIZE
);
211 cdb
[1] = 0x01; /* Query VPD */
212 cdb
[2] = 0x80; /* Unit Serial Number */
213 cdb
[3] = (INQUIRY_VPD_SERIAL_LEN
>> 8) & 0xff;
214 cdb
[4] = (INQUIRY_VPD_SERIAL_LEN
& 0xff);
216 ret
= scsi_execute_req(sdev
, cdb
, DMA_FROM_DEVICE
, buf
,
217 INQUIRY_VPD_SERIAL_LEN
, NULL
, HZ
, 1, NULL
);
221 snprintf(&wwn
->unit_serial
[0], INQUIRY_VPD_SERIAL_LEN
, "%s", &buf
[4]);
223 wwn
->t10_dev
->dev_flags
|= DF_FIRMWARE_VPD_UNIT_SERIAL
;
234 pscsi_get_inquiry_vpd_device_ident(struct scsi_device
*sdev
,
237 unsigned char cdb
[MAX_COMMAND_SIZE
], *buf
, *page_83
;
238 int ident_len
, page_len
, off
= 4, ret
;
241 buf
= kzalloc(INQUIRY_VPD_SERIAL_LEN
, GFP_KERNEL
);
245 memset(cdb
, 0, MAX_COMMAND_SIZE
);
247 cdb
[1] = 0x01; /* Query VPD */
248 cdb
[2] = 0x83; /* Device Identifier */
249 cdb
[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN
>> 8) & 0xff;
250 cdb
[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN
& 0xff);
252 ret
= scsi_execute_req(sdev
, cdb
, DMA_FROM_DEVICE
, buf
,
253 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN
,
258 page_len
= (buf
[2] << 8) | buf
[3];
259 while (page_len
> 0) {
260 /* Grab a pointer to the Identification descriptor */
262 ident_len
= page_83
[3];
264 pr_err("page_83[3]: identifier"
268 pr_debug("T10 VPD Identifier Length: %d\n", ident_len
);
270 vpd
= kzalloc(sizeof(struct t10_vpd
), GFP_KERNEL
);
272 pr_err("Unable to allocate memory for"
273 " struct t10_vpd\n");
276 INIT_LIST_HEAD(&vpd
->vpd_list
);
278 transport_set_vpd_proto_id(vpd
, page_83
);
279 transport_set_vpd_assoc(vpd
, page_83
);
281 if (transport_set_vpd_ident_type(vpd
, page_83
) < 0) {
282 off
+= (ident_len
+ 4);
283 page_len
-= (ident_len
+ 4);
287 if (transport_set_vpd_ident(vpd
, page_83
) < 0) {
288 off
+= (ident_len
+ 4);
289 page_len
-= (ident_len
+ 4);
294 list_add_tail(&vpd
->vpd_list
, &wwn
->t10_vpd_list
);
295 off
+= (ident_len
+ 4);
296 page_len
-= (ident_len
+ 4);
303 static int pscsi_add_device_to_list(struct se_device
*dev
,
304 struct scsi_device
*sd
)
306 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
307 struct request_queue
*q
= sd
->request_queue
;
311 if (!sd
->queue_depth
) {
312 sd
->queue_depth
= PSCSI_DEFAULT_QUEUEDEPTH
;
314 pr_err("Set broken SCSI Device %d:%d:%llu"
315 " queue_depth to %d\n", sd
->channel
, sd
->id
,
316 sd
->lun
, sd
->queue_depth
);
319 dev
->dev_attrib
.hw_block_size
= sd
->sector_size
;
320 dev
->dev_attrib
.hw_max_sectors
=
321 min_t(int, sd
->host
->max_sectors
, queue_max_hw_sectors(q
));
322 dev
->dev_attrib
.hw_queue_depth
= sd
->queue_depth
;
325 * Setup our standard INQUIRY info into se_dev->t10_wwn
327 pscsi_set_inquiry_info(sd
, &dev
->t10_wwn
);
330 * Locate VPD WWN Information used for various purposes within
331 * the Storage Engine.
333 if (!pscsi_get_inquiry_vpd_serial(sd
, &dev
->t10_wwn
)) {
335 * If VPD Unit Serial returned GOOD status, try
336 * VPD Device Identification page (0x83).
338 pscsi_get_inquiry_vpd_device_ident(sd
, &dev
->t10_wwn
);
342 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
344 if (sd
->type
== TYPE_TAPE
)
345 pscsi_tape_read_blocksize(dev
, sd
);
349 static struct se_device
*pscsi_alloc_device(struct se_hba
*hba
,
352 struct pscsi_dev_virt
*pdv
;
354 pdv
= kzalloc(sizeof(struct pscsi_dev_virt
), GFP_KERNEL
);
356 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
360 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv
, name
);
365 * Called with struct Scsi_Host->host_lock called.
367 static int pscsi_create_type_disk(struct se_device
*dev
, struct scsi_device
*sd
)
368 __releases(sh
->host_lock
)
370 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
371 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
372 struct Scsi_Host
*sh
= sd
->host
;
373 struct block_device
*bd
;
376 if (scsi_device_get(sd
)) {
377 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
378 sh
->host_no
, sd
->channel
, sd
->id
, sd
->lun
);
379 spin_unlock_irq(sh
->host_lock
);
382 spin_unlock_irq(sh
->host_lock
);
384 * Claim exclusive struct block_device access to struct scsi_device
385 * for TYPE_DISK using supplied udev_path
387 bd
= blkdev_get_by_path(dev
->udev_path
,
388 FMODE_WRITE
|FMODE_READ
|FMODE_EXCL
, pdv
);
390 pr_err("pSCSI: blkdev_get_by_path() failed\n");
396 ret
= pscsi_add_device_to_list(dev
, sd
);
398 blkdev_put(pdv
->pdv_bd
, FMODE_WRITE
|FMODE_READ
|FMODE_EXCL
);
403 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%llu\n",
404 phv
->phv_host_id
, sh
->host_no
, sd
->channel
, sd
->id
, sd
->lun
);
409 * Called with struct Scsi_Host->host_lock called.
411 static int pscsi_create_type_rom(struct se_device
*dev
, struct scsi_device
*sd
)
412 __releases(sh
->host_lock
)
414 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
415 struct Scsi_Host
*sh
= sd
->host
;
418 if (scsi_device_get(sd
)) {
419 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
420 sh
->host_no
, sd
->channel
, sd
->id
, sd
->lun
);
421 spin_unlock_irq(sh
->host_lock
);
424 spin_unlock_irq(sh
->host_lock
);
426 ret
= pscsi_add_device_to_list(dev
, sd
);
431 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
432 phv
->phv_host_id
, scsi_device_type(sd
->type
), sh
->host_no
,
433 sd
->channel
, sd
->id
, sd
->lun
);
439 * Called with struct Scsi_Host->host_lock called.
441 static int pscsi_create_type_other(struct se_device
*dev
,
442 struct scsi_device
*sd
)
443 __releases(sh
->host_lock
)
445 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
446 struct Scsi_Host
*sh
= sd
->host
;
449 spin_unlock_irq(sh
->host_lock
);
450 ret
= pscsi_add_device_to_list(dev
, sd
);
454 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
455 phv
->phv_host_id
, scsi_device_type(sd
->type
), sh
->host_no
,
456 sd
->channel
, sd
->id
, sd
->lun
);
460 static int pscsi_configure_device(struct se_device
*dev
)
462 struct se_hba
*hba
= dev
->se_hba
;
463 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
464 struct scsi_device
*sd
;
465 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
466 struct Scsi_Host
*sh
= phv
->phv_lld_host
;
467 int legacy_mode_enable
= 0;
470 if (!(pdv
->pdv_flags
& PDF_HAS_CHANNEL_ID
) ||
471 !(pdv
->pdv_flags
& PDF_HAS_TARGET_ID
) ||
472 !(pdv
->pdv_flags
& PDF_HAS_LUN_ID
)) {
473 pr_err("Missing scsi_channel_id=, scsi_target_id= and"
474 " scsi_lun_id= parameters\n");
479 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
480 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
483 if (phv
->phv_mode
== PHV_LLD_SCSI_HOST_NO
) {
484 pr_err("pSCSI: Unable to locate struct"
485 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
489 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
490 * reference, we enforce that udev_path has been set
492 if (!(dev
->dev_flags
& DF_USING_UDEV_PATH
)) {
493 pr_err("pSCSI: udev_path attribute has not"
494 " been set before ENABLE=1\n");
498 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
499 * use the original TCM hba ID to reference Linux/SCSI Host No
500 * and enable for PHV_LLD_SCSI_HOST_NO mode.
502 if (!(pdv
->pdv_flags
& PDF_HAS_VIRT_HOST_ID
)) {
503 if (hba
->dev_count
) {
504 pr_err("pSCSI: Unable to set hba_mode"
505 " with active devices\n");
509 if (pscsi_pmode_enable_hba(hba
, 1) != 1)
512 legacy_mode_enable
= 1;
513 hba
->hba_flags
|= HBA_FLAGS_PSCSI_MODE
;
514 sh
= phv
->phv_lld_host
;
516 sh
= scsi_host_lookup(pdv
->pdv_host_id
);
518 pr_err("pSCSI: Unable to locate"
519 " pdv_host_id: %d\n", pdv
->pdv_host_id
);
522 pdv
->pdv_lld_host
= sh
;
525 if (phv
->phv_mode
== PHV_VIRTUAL_HOST_ID
) {
526 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
527 " struct Scsi_Host exists\n");
532 spin_lock_irq(sh
->host_lock
);
533 list_for_each_entry(sd
, &sh
->__devices
, siblings
) {
534 if ((pdv
->pdv_channel_id
!= sd
->channel
) ||
535 (pdv
->pdv_target_id
!= sd
->id
) ||
536 (pdv
->pdv_lun_id
!= sd
->lun
))
539 * Functions will release the held struct scsi_host->host_lock
540 * before calling calling pscsi_add_device_to_list() to register
541 * struct scsi_device with target_core_mod.
545 ret
= pscsi_create_type_disk(dev
, sd
);
548 ret
= pscsi_create_type_rom(dev
, sd
);
551 ret
= pscsi_create_type_other(dev
, sd
);
556 if (phv
->phv_mode
== PHV_VIRTUAL_HOST_ID
)
558 else if (legacy_mode_enable
) {
559 pscsi_pmode_enable_hba(hba
, 0);
560 hba
->hba_flags
&= ~HBA_FLAGS_PSCSI_MODE
;
567 spin_unlock_irq(sh
->host_lock
);
569 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh
->host_no
,
570 pdv
->pdv_channel_id
, pdv
->pdv_target_id
, pdv
->pdv_lun_id
);
572 if (phv
->phv_mode
== PHV_VIRTUAL_HOST_ID
)
574 else if (legacy_mode_enable
) {
575 pscsi_pmode_enable_hba(hba
, 0);
576 hba
->hba_flags
&= ~HBA_FLAGS_PSCSI_MODE
;
582 static void pscsi_dev_call_rcu(struct rcu_head
*p
)
584 struct se_device
*dev
= container_of(p
, struct se_device
, rcu_head
);
585 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
590 static void pscsi_free_device(struct se_device
*dev
)
592 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
593 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
594 struct scsi_device
*sd
= pdv
->pdv_sd
;
598 * Release exclusive pSCSI internal struct block_device claim for
599 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
601 if ((sd
->type
== TYPE_DISK
) && pdv
->pdv_bd
) {
602 blkdev_put(pdv
->pdv_bd
,
603 FMODE_WRITE
|FMODE_READ
|FMODE_EXCL
);
607 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
608 * to struct Scsi_Host now.
610 if ((phv
->phv_mode
== PHV_LLD_SCSI_HOST_NO
) &&
611 (phv
->phv_lld_host
!= NULL
))
612 scsi_host_put(phv
->phv_lld_host
);
613 else if (pdv
->pdv_lld_host
)
614 scsi_host_put(pdv
->pdv_lld_host
);
616 if ((sd
->type
== TYPE_DISK
) || (sd
->type
== TYPE_ROM
))
621 call_rcu(&dev
->rcu_head
, pscsi_dev_call_rcu
);
624 static void pscsi_transport_complete(struct se_cmd
*cmd
, struct scatterlist
*sg
,
625 unsigned char *sense_buffer
)
627 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(cmd
->se_dev
);
628 struct scsi_device
*sd
= pdv
->pdv_sd
;
630 struct pscsi_plugin_task
*pt
= cmd
->priv
;
633 * Special case for REPORT_LUNs handling where pscsi_plugin_task has
634 * not been allocated because TCM is handling the emulation directly.
639 cdb
= &pt
->pscsi_cdb
[0];
640 result
= pt
->pscsi_result
;
642 * Hack to make sure that Write-Protect modepage is set if R/O mode is
645 if (!cmd
->data_length
)
646 goto after_mode_sense
;
648 if (((cdb
[0] == MODE_SENSE
) || (cdb
[0] == MODE_SENSE_10
)) &&
649 (status_byte(result
) << 1) == SAM_STAT_GOOD
) {
650 bool read_only
= target_lun_is_rdonly(cmd
);
655 buf
= transport_kmap_data_sg(cmd
);
657 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
659 if (cdb
[0] == MODE_SENSE_10
) {
660 if (!(buf
[3] & 0x80))
663 if (!(buf
[2] & 0x80))
667 transport_kunmap_data_sg(cmd
);
672 if (sd
->type
!= TYPE_TAPE
|| !cmd
->data_length
)
673 goto after_mode_select
;
676 * Hack to correctly obtain the initiator requested blocksize for
677 * TYPE_TAPE. Since this value is dependent upon each tape media,
678 * struct scsi_device->sector_size will not contain the correct value
679 * by default, so we go ahead and set it so
680 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
683 if (((cdb
[0] == MODE_SELECT
) || (cdb
[0] == MODE_SELECT_10
)) &&
684 (status_byte(result
) << 1) == SAM_STAT_GOOD
) {
689 buf
= sg_virt(&sg
[0]);
691 pr_err("Unable to get buf for scatterlist\n");
692 goto after_mode_select
;
695 if (cdb
[0] == MODE_SELECT
)
698 bdl
= (buf
[6] << 8) | (buf
[7]);
701 goto after_mode_select
;
703 if (cdb
[0] == MODE_SELECT
)
704 blocksize
= (buf
[9] << 16) | (buf
[10] << 8) |
707 blocksize
= (buf
[13] << 16) | (buf
[14] << 8) |
710 sd
->sector_size
= blocksize
;
714 if (sense_buffer
&& (status_byte(result
) & CHECK_CONDITION
)) {
715 memcpy(sense_buffer
, pt
->pscsi_sense
, TRANSPORT_SENSE_BUFFER
);
716 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
721 Opt_scsi_host_id
, Opt_scsi_channel_id
, Opt_scsi_target_id
,
722 Opt_scsi_lun_id
, Opt_err
725 static match_table_t tokens
= {
726 {Opt_scsi_host_id
, "scsi_host_id=%d"},
727 {Opt_scsi_channel_id
, "scsi_channel_id=%d"},
728 {Opt_scsi_target_id
, "scsi_target_id=%d"},
729 {Opt_scsi_lun_id
, "scsi_lun_id=%d"},
733 static ssize_t
pscsi_set_configfs_dev_params(struct se_device
*dev
,
734 const char *page
, ssize_t count
)
736 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
737 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
738 char *orig
, *ptr
, *opts
;
739 substring_t args
[MAX_OPT_ARGS
];
740 int ret
= 0, arg
, token
;
742 opts
= kstrdup(page
, GFP_KERNEL
);
748 while ((ptr
= strsep(&opts
, ",\n")) != NULL
) {
752 token
= match_token(ptr
, tokens
, args
);
754 case Opt_scsi_host_id
:
755 if (phv
->phv_mode
== PHV_LLD_SCSI_HOST_NO
) {
756 pr_err("PSCSI[%d]: Unable to accept"
757 " scsi_host_id while phv_mode =="
758 " PHV_LLD_SCSI_HOST_NO\n",
763 ret
= match_int(args
, &arg
);
766 pdv
->pdv_host_id
= arg
;
767 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
768 " %d\n", phv
->phv_host_id
, pdv
->pdv_host_id
);
769 pdv
->pdv_flags
|= PDF_HAS_VIRT_HOST_ID
;
771 case Opt_scsi_channel_id
:
772 ret
= match_int(args
, &arg
);
775 pdv
->pdv_channel_id
= arg
;
776 pr_debug("PSCSI[%d]: Referencing SCSI Channel"
777 " ID: %d\n", phv
->phv_host_id
,
778 pdv
->pdv_channel_id
);
779 pdv
->pdv_flags
|= PDF_HAS_CHANNEL_ID
;
781 case Opt_scsi_target_id
:
782 ret
= match_int(args
, &arg
);
785 pdv
->pdv_target_id
= arg
;
786 pr_debug("PSCSI[%d]: Referencing SCSI Target"
787 " ID: %d\n", phv
->phv_host_id
,
789 pdv
->pdv_flags
|= PDF_HAS_TARGET_ID
;
791 case Opt_scsi_lun_id
:
792 ret
= match_int(args
, &arg
);
795 pdv
->pdv_lun_id
= arg
;
796 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
797 " %d\n", phv
->phv_host_id
, pdv
->pdv_lun_id
);
798 pdv
->pdv_flags
|= PDF_HAS_LUN_ID
;
807 return (!ret
) ? count
: ret
;
810 static ssize_t
pscsi_show_configfs_dev_params(struct se_device
*dev
, char *b
)
812 struct pscsi_hba_virt
*phv
= dev
->se_hba
->hba_ptr
;
813 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
814 struct scsi_device
*sd
= pdv
->pdv_sd
;
815 unsigned char host_id
[16];
819 if (phv
->phv_mode
== PHV_VIRTUAL_HOST_ID
)
820 snprintf(host_id
, 16, "%d", pdv
->pdv_host_id
);
822 snprintf(host_id
, 16, "PHBA Mode");
824 bl
= sprintf(b
, "SCSI Device Bus Location:"
825 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
826 pdv
->pdv_channel_id
, pdv
->pdv_target_id
, pdv
->pdv_lun_id
,
830 bl
+= sprintf(b
+ bl
, " ");
831 bl
+= sprintf(b
+ bl
, "Vendor: ");
832 for (i
= 0; i
< 8; i
++) {
833 if (ISPRINT(sd
->vendor
[i
])) /* printable character? */
834 bl
+= sprintf(b
+ bl
, "%c", sd
->vendor
[i
]);
836 bl
+= sprintf(b
+ bl
, " ");
838 bl
+= sprintf(b
+ bl
, " Model: ");
839 for (i
= 0; i
< 16; i
++) {
840 if (ISPRINT(sd
->model
[i
])) /* printable character ? */
841 bl
+= sprintf(b
+ bl
, "%c", sd
->model
[i
]);
843 bl
+= sprintf(b
+ bl
, " ");
845 bl
+= sprintf(b
+ bl
, " Rev: ");
846 for (i
= 0; i
< 4; i
++) {
847 if (ISPRINT(sd
->rev
[i
])) /* printable character ? */
848 bl
+= sprintf(b
+ bl
, "%c", sd
->rev
[i
]);
850 bl
+= sprintf(b
+ bl
, " ");
852 bl
+= sprintf(b
+ bl
, "\n");
857 static void pscsi_bi_endio(struct bio
*bio
, int error
)
862 static inline struct bio
*pscsi_get_bio(int nr_vecs
)
866 * Use bio_malloc() following the comment in for bio -> struct request
867 * in block/blk-core.c:blk_make_request()
869 bio
= bio_kmalloc(GFP_KERNEL
, nr_vecs
);
871 pr_err("PSCSI: bio_kmalloc() failed\n");
874 bio
->bi_end_io
= pscsi_bi_endio
;
879 static sense_reason_t
880 pscsi_map_sg(struct se_cmd
*cmd
, struct scatterlist
*sgl
, u32 sgl_nents
,
881 enum dma_data_direction data_direction
, struct bio
**hbio
)
883 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(cmd
->se_dev
);
884 struct bio
*bio
= NULL
, *tbio
= NULL
;
886 struct scatterlist
*sg
;
887 u32 data_len
= cmd
->data_length
, i
, len
, bytes
, off
;
888 int nr_pages
= (cmd
->data_length
+ sgl
[0].offset
+
889 PAGE_SIZE
- 1) >> PAGE_SHIFT
;
891 int rw
= (data_direction
== DMA_TO_DEVICE
);
895 pr_debug("PSCSI: nr_pages: %d\n", nr_pages
);
897 for_each_sg(sgl
, sg
, sgl_nents
, i
) {
902 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i
,
906 * We only have one page of data in each sg element,
907 * we can not cross a page boundary.
909 if (off
+ len
> PAGE_SIZE
)
912 if (len
> 0 && data_len
> 0) {
913 bytes
= min_t(unsigned int, len
, PAGE_SIZE
- off
);
914 bytes
= min(bytes
, data_len
);
917 nr_vecs
= min_t(int, BIO_MAX_PAGES
, nr_pages
);
920 * Calls bio_kmalloc() and sets bio->bi_end_io()
922 bio
= pscsi_get_bio(nr_vecs
);
927 bio
->bi_rw
|= REQ_WRITE
;
929 pr_debug("PSCSI: Allocated bio: %p,"
930 " dir: %s nr_vecs: %d\n", bio
,
931 (rw
) ? "rw" : "r", nr_vecs
);
933 * Set *hbio pointer to handle the case:
934 * nr_pages > BIO_MAX_PAGES, where additional
935 * bios need to be added to complete a given
941 tbio
= tbio
->bi_next
= bio
;
944 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
945 " bio: %p page: %p len: %d off: %d\n", i
, bio
,
948 rc
= bio_add_pc_page(pdv
->pdv_sd
->request_queue
,
949 bio
, page
, bytes
, off
);
953 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
954 bio
->bi_vcnt
, nr_vecs
);
956 if (bio
->bi_vcnt
> nr_vecs
) {
957 pr_debug("PSCSI: Reached bio->bi_vcnt max:"
958 " %d i: %d bio: %p, allocating another"
959 " bio\n", bio
->bi_vcnt
, i
, bio
);
961 * Clear the pointer so that another bio will
962 * be allocated with pscsi_get_bio() above, the
963 * current bio has already been set *tbio and
977 *hbio
= (*hbio
)->bi_next
;
978 bio_endio(bio
, 0); /* XXX: should be error */
980 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
983 static sense_reason_t
984 pscsi_parse_cdb(struct se_cmd
*cmd
)
986 if (cmd
->se_cmd_flags
& SCF_BIDI
)
987 return TCM_UNSUPPORTED_SCSI_OPCODE
;
989 return passthrough_parse_cdb(cmd
, pscsi_execute_cmd
);
992 static sense_reason_t
993 pscsi_execute_cmd(struct se_cmd
*cmd
)
995 struct scatterlist
*sgl
= cmd
->t_data_sg
;
996 u32 sgl_nents
= cmd
->t_data_nents
;
997 enum dma_data_direction data_direction
= cmd
->data_direction
;
998 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(cmd
->se_dev
);
999 struct pscsi_plugin_task
*pt
;
1000 struct request
*req
;
1005 * Dynamically alloc cdb space, since it may be larger than
1006 * TCM_MAX_COMMAND_SIZE
1008 pt
= kzalloc(sizeof(*pt
) + scsi_command_size(cmd
->t_task_cdb
), GFP_KERNEL
);
1010 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1014 memcpy(pt
->pscsi_cdb
, cmd
->t_task_cdb
,
1015 scsi_command_size(cmd
->t_task_cdb
));
1018 req
= blk_get_request(pdv
->pdv_sd
->request_queue
,
1019 (data_direction
== DMA_TO_DEVICE
),
1022 pr_err("PSCSI: blk_get_request() failed\n");
1023 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1027 blk_rq_set_block_pc(req
);
1029 BUG_ON(!cmd
->data_length
);
1031 ret
= pscsi_map_sg(cmd
, sgl
, sgl_nents
, data_direction
, &hbio
);
1035 req
= blk_make_request(pdv
->pdv_sd
->request_queue
, hbio
,
1038 pr_err("pSCSI: blk_make_request() failed\n");
1039 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1044 req
->end_io
= pscsi_req_done
;
1045 req
->end_io_data
= cmd
;
1046 req
->cmd_len
= scsi_command_size(pt
->pscsi_cdb
);
1047 req
->cmd
= &pt
->pscsi_cdb
[0];
1048 req
->sense
= &pt
->pscsi_sense
[0];
1050 if (pdv
->pdv_sd
->type
== TYPE_DISK
)
1051 req
->timeout
= PS_TIMEOUT_DISK
;
1053 req
->timeout
= PS_TIMEOUT_OTHER
;
1054 req
->retries
= PS_RETRY
;
1056 blk_execute_rq_nowait(pdv
->pdv_sd
->request_queue
, NULL
, req
,
1057 (cmd
->sam_task_attr
== TCM_HEAD_TAG
),
1064 struct bio
*bio
= hbio
;
1065 hbio
= hbio
->bi_next
;
1066 bio_endio(bio
, 0); /* XXX: should be error */
1068 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1074 /* pscsi_get_device_type():
1078 static u32
pscsi_get_device_type(struct se_device
*dev
)
1080 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
1081 struct scsi_device
*sd
= pdv
->pdv_sd
;
1083 return (sd
) ? sd
->type
: TYPE_NO_LUN
;
1086 static sector_t
pscsi_get_blocks(struct se_device
*dev
)
1088 struct pscsi_dev_virt
*pdv
= PSCSI_DEV(dev
);
1090 if (pdv
->pdv_bd
&& pdv
->pdv_bd
->bd_part
)
1091 return pdv
->pdv_bd
->bd_part
->nr_sects
;
1097 static void pscsi_req_done(struct request
*req
, int uptodate
)
1099 struct se_cmd
*cmd
= req
->end_io_data
;
1100 struct pscsi_plugin_task
*pt
= cmd
->priv
;
1102 pt
->pscsi_result
= req
->errors
;
1103 pt
->pscsi_resid
= req
->resid_len
;
1105 cmd
->scsi_status
= status_byte(pt
->pscsi_result
) << 1;
1106 if (cmd
->scsi_status
) {
1107 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1108 " 0x%02x Result: 0x%08x\n", cmd
, pt
->pscsi_cdb
[0],
1112 switch (host_byte(pt
->pscsi_result
)) {
1114 target_complete_cmd(cmd
, cmd
->scsi_status
);
1117 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1118 " 0x%02x Result: 0x%08x\n", cmd
, pt
->pscsi_cdb
[0],
1120 target_complete_cmd(cmd
, SAM_STAT_CHECK_CONDITION
);
1124 __blk_put_request(req
->q
, req
);
1128 static const struct target_backend_ops pscsi_ops
= {
1130 .owner
= THIS_MODULE
,
1131 .transport_flags
= TRANSPORT_FLAG_PASSTHROUGH
,
1132 .attach_hba
= pscsi_attach_hba
,
1133 .detach_hba
= pscsi_detach_hba
,
1134 .pmode_enable_hba
= pscsi_pmode_enable_hba
,
1135 .alloc_device
= pscsi_alloc_device
,
1136 .configure_device
= pscsi_configure_device
,
1137 .free_device
= pscsi_free_device
,
1138 .transport_complete
= pscsi_transport_complete
,
1139 .parse_cdb
= pscsi_parse_cdb
,
1140 .set_configfs_dev_params
= pscsi_set_configfs_dev_params
,
1141 .show_configfs_dev_params
= pscsi_show_configfs_dev_params
,
1142 .get_device_type
= pscsi_get_device_type
,
1143 .get_blocks
= pscsi_get_blocks
,
1144 .tb_dev_attrib_attrs
= passthrough_attrib_attrs
,
1147 static int __init
pscsi_module_init(void)
1149 return transport_backend_register(&pscsi_ops
);
1152 static void __exit
pscsi_module_exit(void)
1154 target_backend_unregister(&pscsi_ops
);
1157 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1158 MODULE_AUTHOR("nab@Linux-iSCSI.org");
1159 MODULE_LICENSE("GPL");
1161 module_init(pscsi_module_init
);
1162 module_exit(pscsi_module_exit
);