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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> | |
e66ecd50 | 44 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
45 | |
46 | #include <target/target_core_base.h> | |
47 | #include <target/target_core_device.h> | |
48 | #include <target/target_core_transport.h> | |
49 | ||
50 | #include "target_core_pscsi.h" | |
51 | ||
52 | #define ISPRINT(a) ((a >= ' ') && (a <= '~')) | |
53 | ||
54 | static struct se_subsystem_api pscsi_template; | |
55 | ||
56 | static void pscsi_req_done(struct request *, int); | |
57 | ||
c66ac9db NB |
58 | /* pscsi_attach_hba(): |
59 | * | |
60 | * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. | |
61 | * from the passed SCSI Host ID. | |
62 | */ | |
63 | static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) | |
64 | { | |
c66ac9db NB |
65 | struct pscsi_hba_virt *phv; |
66 | ||
67 | phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); | |
6708bb27 AG |
68 | if (!phv) { |
69 | pr_err("Unable to allocate struct pscsi_hba_virt\n"); | |
e3d6f909 | 70 | return -ENOMEM; |
c66ac9db NB |
71 | } |
72 | phv->phv_host_id = host_id; | |
73 | phv->phv_mode = PHV_VIRUTAL_HOST_ID; | |
c66ac9db | 74 | |
5951146d | 75 | hba->hba_ptr = phv; |
c66ac9db | 76 | |
6708bb27 | 77 | pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" |
c66ac9db NB |
78 | " Generic Target Core Stack %s\n", hba->hba_id, |
79 | PSCSI_VERSION, TARGET_CORE_MOD_VERSION); | |
6708bb27 | 80 | pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", |
e3d6f909 | 81 | hba->hba_id); |
c66ac9db NB |
82 | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static void pscsi_detach_hba(struct se_hba *hba) | |
87 | { | |
88 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
89 | struct Scsi_Host *scsi_host = phv->phv_lld_host; | |
90 | ||
91 | if (scsi_host) { | |
92 | scsi_host_put(scsi_host); | |
93 | ||
6708bb27 | 94 | pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" |
c66ac9db NB |
95 | " Generic Target Core\n", hba->hba_id, |
96 | (scsi_host->hostt->name) ? (scsi_host->hostt->name) : | |
97 | "Unknown"); | |
98 | } else | |
6708bb27 | 99 | pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" |
c66ac9db NB |
100 | " from Generic Target Core\n", hba->hba_id); |
101 | ||
102 | kfree(phv); | |
103 | hba->hba_ptr = NULL; | |
104 | } | |
105 | ||
106 | static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) | |
107 | { | |
108 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; | |
109 | struct Scsi_Host *sh = phv->phv_lld_host; | |
c66ac9db NB |
110 | /* |
111 | * Release the struct Scsi_Host | |
112 | */ | |
6708bb27 AG |
113 | if (!mode_flag) { |
114 | if (!sh) | |
c66ac9db NB |
115 | return 0; |
116 | ||
117 | phv->phv_lld_host = NULL; | |
118 | phv->phv_mode = PHV_VIRUTAL_HOST_ID; | |
c66ac9db | 119 | |
6708bb27 | 120 | pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" |
c66ac9db NB |
121 | " %s\n", hba->hba_id, (sh->hostt->name) ? |
122 | (sh->hostt->name) : "Unknown"); | |
123 | ||
124 | scsi_host_put(sh); | |
125 | return 0; | |
126 | } | |
127 | /* | |
128 | * Otherwise, locate struct Scsi_Host from the original passed | |
129 | * pSCSI Host ID and enable for phba mode | |
130 | */ | |
e3d6f909 AG |
131 | sh = scsi_host_lookup(phv->phv_host_id); |
132 | if (IS_ERR(sh)) { | |
6708bb27 | 133 | pr_err("pSCSI: Unable to locate SCSI Host for" |
c66ac9db | 134 | " phv_host_id: %d\n", phv->phv_host_id); |
e3d6f909 | 135 | return PTR_ERR(sh); |
c66ac9db | 136 | } |
c66ac9db NB |
137 | |
138 | phv->phv_lld_host = sh; | |
139 | phv->phv_mode = PHV_LLD_SCSI_HOST_NO; | |
140 | ||
6708bb27 | 141 | pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", |
c66ac9db NB |
142 | hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); |
143 | ||
144 | return 1; | |
145 | } | |
146 | ||
147 | static void pscsi_tape_read_blocksize(struct se_device *dev, | |
148 | struct scsi_device *sdev) | |
149 | { | |
150 | unsigned char cdb[MAX_COMMAND_SIZE], *buf; | |
151 | int ret; | |
152 | ||
153 | buf = kzalloc(12, GFP_KERNEL); | |
154 | if (!buf) | |
155 | return; | |
156 | ||
157 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
158 | cdb[0] = MODE_SENSE; | |
159 | cdb[4] = 0x0c; /* 12 bytes */ | |
160 | ||
161 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, | |
162 | HZ, 1, NULL); | |
163 | if (ret) | |
164 | goto out_free; | |
165 | ||
166 | /* | |
167 | * If MODE_SENSE still returns zero, set the default value to 1024. | |
168 | */ | |
169 | sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); | |
170 | if (!sdev->sector_size) | |
171 | sdev->sector_size = 1024; | |
172 | out_free: | |
173 | kfree(buf); | |
174 | } | |
175 | ||
176 | static void | |
177 | pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) | |
178 | { | |
179 | unsigned char *buf; | |
180 | ||
181 | if (sdev->inquiry_len < INQUIRY_LEN) | |
182 | return; | |
183 | ||
184 | buf = sdev->inquiry; | |
185 | if (!buf) | |
186 | return; | |
187 | /* | |
188 | * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() | |
189 | */ | |
190 | memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); | |
191 | memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); | |
192 | memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); | |
193 | } | |
194 | ||
195 | static int | |
196 | pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) | |
197 | { | |
198 | unsigned char cdb[MAX_COMMAND_SIZE], *buf; | |
199 | int ret; | |
200 | ||
201 | buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); | |
202 | if (!buf) | |
e3d6f909 | 203 | return -ENOMEM; |
c66ac9db NB |
204 | |
205 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
206 | cdb[0] = INQUIRY; | |
207 | cdb[1] = 0x01; /* Query VPD */ | |
208 | cdb[2] = 0x80; /* Unit Serial Number */ | |
209 | cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; | |
210 | cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); | |
211 | ||
212 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, | |
213 | INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); | |
214 | if (ret) | |
215 | goto out_free; | |
216 | ||
217 | snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); | |
218 | ||
219 | wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL; | |
220 | ||
221 | kfree(buf); | |
222 | return 0; | |
223 | ||
224 | out_free: | |
225 | kfree(buf); | |
e3d6f909 | 226 | return -EPERM; |
c66ac9db NB |
227 | } |
228 | ||
229 | static void | |
230 | pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, | |
231 | struct t10_wwn *wwn) | |
232 | { | |
233 | unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; | |
234 | int ident_len, page_len, off = 4, ret; | |
235 | struct t10_vpd *vpd; | |
236 | ||
237 | buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); | |
238 | if (!buf) | |
239 | return; | |
240 | ||
241 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
242 | cdb[0] = INQUIRY; | |
243 | cdb[1] = 0x01; /* Query VPD */ | |
244 | cdb[2] = 0x83; /* Device Identifier */ | |
245 | cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; | |
246 | cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); | |
247 | ||
248 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, | |
249 | INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, | |
250 | NULL, HZ, 1, NULL); | |
251 | if (ret) | |
252 | goto out; | |
253 | ||
254 | page_len = (buf[2] << 8) | buf[3]; | |
255 | while (page_len > 0) { | |
256 | /* Grab a pointer to the Identification descriptor */ | |
257 | page_83 = &buf[off]; | |
258 | ident_len = page_83[3]; | |
259 | if (!ident_len) { | |
6708bb27 | 260 | pr_err("page_83[3]: identifier" |
c66ac9db NB |
261 | " length zero!\n"); |
262 | break; | |
263 | } | |
6708bb27 | 264 | pr_debug("T10 VPD Identifer Length: %d\n", ident_len); |
c66ac9db NB |
265 | |
266 | vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); | |
267 | if (!vpd) { | |
6708bb27 | 268 | pr_err("Unable to allocate memory for" |
c66ac9db NB |
269 | " struct t10_vpd\n"); |
270 | goto out; | |
271 | } | |
272 | INIT_LIST_HEAD(&vpd->vpd_list); | |
273 | ||
274 | transport_set_vpd_proto_id(vpd, page_83); | |
275 | transport_set_vpd_assoc(vpd, page_83); | |
276 | ||
277 | if (transport_set_vpd_ident_type(vpd, page_83) < 0) { | |
278 | off += (ident_len + 4); | |
279 | page_len -= (ident_len + 4); | |
280 | kfree(vpd); | |
281 | continue; | |
282 | } | |
283 | if (transport_set_vpd_ident(vpd, page_83) < 0) { | |
284 | off += (ident_len + 4); | |
285 | page_len -= (ident_len + 4); | |
286 | kfree(vpd); | |
287 | continue; | |
288 | } | |
289 | ||
290 | list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); | |
291 | off += (ident_len + 4); | |
292 | page_len -= (ident_len + 4); | |
293 | } | |
294 | ||
295 | out: | |
296 | kfree(buf); | |
297 | } | |
298 | ||
299 | /* pscsi_add_device_to_list(): | |
300 | * | |
301 | * | |
302 | */ | |
303 | static struct se_device *pscsi_add_device_to_list( | |
304 | struct se_hba *hba, | |
305 | struct se_subsystem_dev *se_dev, | |
306 | struct pscsi_dev_virt *pdv, | |
307 | struct scsi_device *sd, | |
308 | int dev_flags) | |
309 | { | |
310 | struct se_device *dev; | |
311 | struct se_dev_limits dev_limits; | |
312 | struct request_queue *q; | |
313 | struct queue_limits *limits; | |
314 | ||
315 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
316 | ||
317 | if (!sd->queue_depth) { | |
318 | sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; | |
319 | ||
6708bb27 | 320 | pr_err("Set broken SCSI Device %d:%d:%d" |
c66ac9db NB |
321 | " queue_depth to %d\n", sd->channel, sd->id, |
322 | sd->lun, sd->queue_depth); | |
323 | } | |
324 | /* | |
325 | * Setup the local scope queue_limits from struct request_queue->limits | |
326 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
327 | */ | |
328 | q = sd->request_queue; | |
329 | limits = &dev_limits.limits; | |
330 | limits->logical_block_size = sd->sector_size; | |
a1d8b49a AG |
331 | limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q)); |
332 | limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q)); | |
c66ac9db NB |
333 | dev_limits.hw_queue_depth = sd->queue_depth; |
334 | dev_limits.queue_depth = sd->queue_depth; | |
335 | /* | |
336 | * Setup our standard INQUIRY info into se_dev->t10_wwn | |
337 | */ | |
338 | pscsi_set_inquiry_info(sd, &se_dev->t10_wwn); | |
339 | ||
340 | /* | |
341 | * Set the pointer pdv->pdv_sd to from passed struct scsi_device, | |
342 | * which has already been referenced with Linux SCSI code with | |
343 | * scsi_device_get() in this file's pscsi_create_virtdevice(). | |
344 | * | |
345 | * The passthrough operations called by the transport_add_device_* | |
346 | * function below will require this pointer to be set for passthroug | |
347 | * ops. | |
348 | * | |
349 | * For the shutdown case in pscsi_free_device(), this struct | |
350 | * scsi_device reference is released with Linux SCSI code | |
351 | * scsi_device_put() and the pdv->pdv_sd cleared. | |
352 | */ | |
353 | pdv->pdv_sd = sd; | |
354 | ||
355 | dev = transport_add_device_to_core_hba(hba, &pscsi_template, | |
5951146d | 356 | se_dev, dev_flags, pdv, |
c66ac9db | 357 | &dev_limits, NULL, NULL); |
6708bb27 | 358 | if (!dev) { |
c66ac9db NB |
359 | pdv->pdv_sd = NULL; |
360 | return NULL; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Locate VPD WWN Information used for various purposes within | |
365 | * the Storage Engine. | |
366 | */ | |
367 | if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) { | |
368 | /* | |
369 | * If VPD Unit Serial returned GOOD status, try | |
370 | * VPD Device Identification page (0x83). | |
371 | */ | |
372 | pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn); | |
373 | } | |
374 | ||
375 | /* | |
376 | * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. | |
377 | */ | |
378 | if (sd->type == TYPE_TAPE) | |
379 | pscsi_tape_read_blocksize(dev, sd); | |
380 | return dev; | |
381 | } | |
382 | ||
383 | static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name) | |
384 | { | |
385 | struct pscsi_dev_virt *pdv; | |
386 | ||
387 | pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); | |
6708bb27 AG |
388 | if (!pdv) { |
389 | pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); | |
c66ac9db NB |
390 | return NULL; |
391 | } | |
392 | pdv->pdv_se_hba = hba; | |
393 | ||
6708bb27 | 394 | pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); |
5951146d | 395 | return pdv; |
c66ac9db NB |
396 | } |
397 | ||
398 | /* | |
399 | * Called with struct Scsi_Host->host_lock called. | |
400 | */ | |
401 | static struct se_device *pscsi_create_type_disk( | |
402 | struct scsi_device *sd, | |
403 | struct pscsi_dev_virt *pdv, | |
404 | struct se_subsystem_dev *se_dev, | |
405 | struct se_hba *hba) | |
5dd7ed2e | 406 | __releases(sh->host_lock) |
c66ac9db NB |
407 | { |
408 | struct se_device *dev; | |
409 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
410 | struct Scsi_Host *sh = sd->host; | |
411 | struct block_device *bd; | |
412 | u32 dev_flags = 0; | |
413 | ||
414 | if (scsi_device_get(sd)) { | |
6708bb27 | 415 | pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", |
c66ac9db NB |
416 | sh->host_no, sd->channel, sd->id, sd->lun); |
417 | spin_unlock_irq(sh->host_lock); | |
418 | return NULL; | |
419 | } | |
420 | spin_unlock_irq(sh->host_lock); | |
421 | /* | |
422 | * Claim exclusive struct block_device access to struct scsi_device | |
423 | * for TYPE_DISK using supplied udev_path | |
424 | */ | |
425 | bd = blkdev_get_by_path(se_dev->se_dev_udev_path, | |
426 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); | |
3ae279d2 | 427 | if (IS_ERR(bd)) { |
6708bb27 | 428 | pr_err("pSCSI: blkdev_get_by_path() failed\n"); |
c66ac9db NB |
429 | scsi_device_put(sd); |
430 | return NULL; | |
431 | } | |
432 | pdv->pdv_bd = bd; | |
433 | ||
434 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
6708bb27 | 435 | if (!dev) { |
c66ac9db NB |
436 | blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
437 | scsi_device_put(sd); | |
438 | return NULL; | |
439 | } | |
6708bb27 | 440 | pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n", |
c66ac9db NB |
441 | phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); |
442 | ||
443 | return dev; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Called with struct Scsi_Host->host_lock called. | |
448 | */ | |
449 | static struct se_device *pscsi_create_type_rom( | |
450 | struct scsi_device *sd, | |
451 | struct pscsi_dev_virt *pdv, | |
452 | struct se_subsystem_dev *se_dev, | |
453 | struct se_hba *hba) | |
5dd7ed2e | 454 | __releases(sh->host_lock) |
c66ac9db NB |
455 | { |
456 | struct se_device *dev; | |
457 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
458 | struct Scsi_Host *sh = sd->host; | |
459 | u32 dev_flags = 0; | |
460 | ||
461 | if (scsi_device_get(sd)) { | |
6708bb27 | 462 | pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", |
c66ac9db NB |
463 | sh->host_no, sd->channel, sd->id, sd->lun); |
464 | spin_unlock_irq(sh->host_lock); | |
465 | return NULL; | |
466 | } | |
467 | spin_unlock_irq(sh->host_lock); | |
468 | ||
469 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
6708bb27 | 470 | if (!dev) { |
c66ac9db NB |
471 | scsi_device_put(sd); |
472 | return NULL; | |
473 | } | |
6708bb27 | 474 | pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", |
c66ac9db NB |
475 | phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, |
476 | sd->channel, sd->id, sd->lun); | |
477 | ||
478 | return dev; | |
479 | } | |
480 | ||
481 | /* | |
482 | *Called with struct Scsi_Host->host_lock called. | |
483 | */ | |
484 | static struct se_device *pscsi_create_type_other( | |
485 | struct scsi_device *sd, | |
486 | struct pscsi_dev_virt *pdv, | |
487 | struct se_subsystem_dev *se_dev, | |
488 | struct se_hba *hba) | |
5dd7ed2e | 489 | __releases(sh->host_lock) |
c66ac9db NB |
490 | { |
491 | struct se_device *dev; | |
492 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
493 | struct Scsi_Host *sh = sd->host; | |
494 | u32 dev_flags = 0; | |
495 | ||
496 | spin_unlock_irq(sh->host_lock); | |
497 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
6708bb27 | 498 | if (!dev) |
c66ac9db NB |
499 | return NULL; |
500 | ||
6708bb27 | 501 | pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", |
c66ac9db NB |
502 | phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, |
503 | sd->channel, sd->id, sd->lun); | |
504 | ||
505 | return dev; | |
506 | } | |
507 | ||
508 | static struct se_device *pscsi_create_virtdevice( | |
509 | struct se_hba *hba, | |
510 | struct se_subsystem_dev *se_dev, | |
511 | void *p) | |
512 | { | |
513 | struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p; | |
514 | struct se_device *dev; | |
515 | struct scsi_device *sd; | |
516 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; | |
517 | struct Scsi_Host *sh = phv->phv_lld_host; | |
518 | int legacy_mode_enable = 0; | |
519 | ||
6708bb27 AG |
520 | if (!pdv) { |
521 | pr_err("Unable to locate struct pscsi_dev_virt" | |
c66ac9db | 522 | " parameter\n"); |
613640e4 | 523 | return ERR_PTR(-EINVAL); |
c66ac9db NB |
524 | } |
525 | /* | |
526 | * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the | |
527 | * struct Scsi_Host we will need to bring the TCM/pSCSI object online | |
528 | */ | |
6708bb27 | 529 | if (!sh) { |
c66ac9db | 530 | if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { |
6708bb27 | 531 | pr_err("pSCSI: Unable to locate struct" |
c66ac9db | 532 | " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); |
613640e4 | 533 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
534 | } |
535 | /* | |
536 | * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device | |
537 | * reference, we enforce that udev_path has been set | |
538 | */ | |
539 | if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) { | |
6708bb27 | 540 | pr_err("pSCSI: udev_path attribute has not" |
c66ac9db | 541 | " been set before ENABLE=1\n"); |
613640e4 | 542 | return ERR_PTR(-EINVAL); |
c66ac9db NB |
543 | } |
544 | /* | |
545 | * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID, | |
546 | * use the original TCM hba ID to reference Linux/SCSI Host No | |
547 | * and enable for PHV_LLD_SCSI_HOST_NO mode. | |
548 | */ | |
549 | if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { | |
550 | spin_lock(&hba->device_lock); | |
6708bb27 AG |
551 | if (!list_empty(&hba->hba_dev_list)) { |
552 | pr_err("pSCSI: Unable to set hba_mode" | |
c66ac9db NB |
553 | " with active devices\n"); |
554 | spin_unlock(&hba->device_lock); | |
613640e4 | 555 | return ERR_PTR(-EEXIST); |
c66ac9db NB |
556 | } |
557 | spin_unlock(&hba->device_lock); | |
558 | ||
559 | if (pscsi_pmode_enable_hba(hba, 1) != 1) | |
613640e4 | 560 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
561 | |
562 | legacy_mode_enable = 1; | |
563 | hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; | |
564 | sh = phv->phv_lld_host; | |
565 | } else { | |
e3d6f909 AG |
566 | sh = scsi_host_lookup(pdv->pdv_host_id); |
567 | if (IS_ERR(sh)) { | |
6708bb27 | 568 | pr_err("pSCSI: Unable to locate" |
c66ac9db | 569 | " pdv_host_id: %d\n", pdv->pdv_host_id); |
e3d6f909 | 570 | return (struct se_device *) sh; |
c66ac9db NB |
571 | } |
572 | } | |
573 | } else { | |
574 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) { | |
6708bb27 | 575 | pr_err("pSCSI: PHV_VIRUTAL_HOST_ID set while" |
c66ac9db | 576 | " struct Scsi_Host exists\n"); |
613640e4 | 577 | return ERR_PTR(-EEXIST); |
c66ac9db NB |
578 | } |
579 | } | |
580 | ||
581 | spin_lock_irq(sh->host_lock); | |
582 | list_for_each_entry(sd, &sh->__devices, siblings) { | |
583 | if ((pdv->pdv_channel_id != sd->channel) || | |
584 | (pdv->pdv_target_id != sd->id) || | |
585 | (pdv->pdv_lun_id != sd->lun)) | |
586 | continue; | |
587 | /* | |
588 | * Functions will release the held struct scsi_host->host_lock | |
589 | * before calling calling pscsi_add_device_to_list() to register | |
590 | * struct scsi_device with target_core_mod. | |
591 | */ | |
592 | switch (sd->type) { | |
593 | case TYPE_DISK: | |
594 | dev = pscsi_create_type_disk(sd, pdv, se_dev, hba); | |
595 | break; | |
596 | case TYPE_ROM: | |
597 | dev = pscsi_create_type_rom(sd, pdv, se_dev, hba); | |
598 | break; | |
599 | default: | |
600 | dev = pscsi_create_type_other(sd, pdv, se_dev, hba); | |
601 | break; | |
602 | } | |
603 | ||
6708bb27 | 604 | if (!dev) { |
c66ac9db NB |
605 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) |
606 | scsi_host_put(sh); | |
607 | else if (legacy_mode_enable) { | |
608 | pscsi_pmode_enable_hba(hba, 0); | |
609 | hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; | |
610 | } | |
611 | pdv->pdv_sd = NULL; | |
613640e4 | 612 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
613 | } |
614 | return dev; | |
615 | } | |
616 | spin_unlock_irq(sh->host_lock); | |
617 | ||
6708bb27 | 618 | pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, |
c66ac9db NB |
619 | pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); |
620 | ||
621 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) | |
622 | scsi_host_put(sh); | |
623 | else if (legacy_mode_enable) { | |
624 | pscsi_pmode_enable_hba(hba, 0); | |
625 | hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; | |
626 | } | |
627 | ||
613640e4 | 628 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
629 | } |
630 | ||
631 | /* pscsi_free_device(): (Part of se_subsystem_api_t template) | |
632 | * | |
633 | * | |
634 | */ | |
635 | static void pscsi_free_device(void *p) | |
636 | { | |
637 | struct pscsi_dev_virt *pdv = p; | |
638 | struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; | |
639 | struct scsi_device *sd = pdv->pdv_sd; | |
640 | ||
641 | if (sd) { | |
642 | /* | |
643 | * Release exclusive pSCSI internal struct block_device claim for | |
644 | * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() | |
645 | */ | |
646 | if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { | |
647 | blkdev_put(pdv->pdv_bd, | |
648 | FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
649 | pdv->pdv_bd = NULL; | |
650 | } | |
651 | /* | |
652 | * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference | |
653 | * to struct Scsi_Host now. | |
654 | */ | |
655 | if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && | |
656 | (phv->phv_lld_host != NULL)) | |
657 | scsi_host_put(phv->phv_lld_host); | |
658 | ||
659 | if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) | |
660 | scsi_device_put(sd); | |
661 | ||
662 | pdv->pdv_sd = NULL; | |
663 | } | |
664 | ||
665 | kfree(pdv); | |
666 | } | |
667 | ||
668 | static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task) | |
669 | { | |
670 | return container_of(task, struct pscsi_plugin_task, pscsi_task); | |
671 | } | |
672 | ||
673 | ||
674 | /* pscsi_transport_complete(): | |
675 | * | |
676 | * | |
677 | */ | |
678 | static int pscsi_transport_complete(struct se_task *task) | |
679 | { | |
680 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
681 | struct scsi_device *sd = pdv->pdv_sd; | |
682 | int result; | |
683 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
684 | unsigned char *cdb = &pt->pscsi_cdb[0]; | |
685 | ||
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) { | |
e3d6f909 | 693 | if (!task->task_se_cmd->se_deve) |
c66ac9db NB |
694 | goto after_mode_sense; |
695 | ||
e3d6f909 | 696 | if (task->task_se_cmd->se_deve->lun_flags & |
c66ac9db | 697 | TRANSPORT_LUNFLAGS_READ_ONLY) { |
05d1c7c0 | 698 | unsigned char *buf = transport_kmap_first_data_page(task->task_se_cmd); |
c66ac9db NB |
699 | |
700 | if (cdb[0] == MODE_SENSE_10) { | |
701 | if (!(buf[3] & 0x80)) | |
702 | buf[3] |= 0x80; | |
703 | } else { | |
704 | if (!(buf[2] & 0x80)) | |
705 | buf[2] |= 0x80; | |
706 | } | |
05d1c7c0 AG |
707 | |
708 | transport_kunmap_first_data_page(task->task_se_cmd); | |
c66ac9db NB |
709 | } |
710 | } | |
711 | after_mode_sense: | |
712 | ||
713 | if (sd->type != TYPE_TAPE) | |
714 | goto after_mode_select; | |
715 | ||
716 | /* | |
717 | * Hack to correctly obtain the initiator requested blocksize for | |
718 | * TYPE_TAPE. Since this value is dependent upon each tape media, | |
719 | * struct scsi_device->sector_size will not contain the correct value | |
720 | * by default, so we go ahead and set it so | |
721 | * TRANSPORT(dev)->get_blockdev() returns the correct value to the | |
722 | * storage engine. | |
723 | */ | |
724 | if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && | |
725 | (status_byte(result) << 1) == SAM_STAT_GOOD) { | |
726 | unsigned char *buf; | |
727 | struct scatterlist *sg = task->task_sg; | |
728 | u16 bdl; | |
729 | u32 blocksize; | |
730 | ||
731 | buf = sg_virt(&sg[0]); | |
6708bb27 AG |
732 | if (!buf) { |
733 | pr_err("Unable to get buf for scatterlist\n"); | |
c66ac9db NB |
734 | goto after_mode_select; |
735 | } | |
736 | ||
737 | if (cdb[0] == MODE_SELECT) | |
738 | bdl = (buf[3]); | |
739 | else | |
740 | bdl = (buf[6] << 8) | (buf[7]); | |
741 | ||
742 | if (!bdl) | |
743 | goto after_mode_select; | |
744 | ||
745 | if (cdb[0] == MODE_SELECT) | |
746 | blocksize = (buf[9] << 16) | (buf[10] << 8) | | |
747 | (buf[11]); | |
748 | else | |
749 | blocksize = (buf[13] << 16) | (buf[14] << 8) | | |
750 | (buf[15]); | |
751 | ||
752 | sd->sector_size = blocksize; | |
753 | } | |
754 | after_mode_select: | |
755 | ||
756 | if (status_byte(result) & CHECK_CONDITION) | |
757 | return 1; | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | static struct se_task * | |
6708bb27 | 763 | pscsi_alloc_task(unsigned char *cdb) |
c66ac9db NB |
764 | { |
765 | struct pscsi_plugin_task *pt; | |
c66ac9db | 766 | |
6708bb27 AG |
767 | /* |
768 | * Dynamically alloc cdb space, since it may be larger than | |
769 | * TCM_MAX_COMMAND_SIZE | |
770 | */ | |
771 | pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL); | |
c66ac9db | 772 | if (!pt) { |
6708bb27 | 773 | pr_err("Unable to allocate struct pscsi_plugin_task\n"); |
c66ac9db NB |
774 | return NULL; |
775 | } | |
776 | ||
c66ac9db NB |
777 | return &pt->pscsi_task; |
778 | } | |
779 | ||
780 | static inline void pscsi_blk_init_request( | |
781 | struct se_task *task, | |
782 | struct pscsi_plugin_task *pt, | |
783 | struct request *req, | |
784 | int bidi_read) | |
785 | { | |
786 | /* | |
787 | * Defined as "scsi command" in include/linux/blkdev.h. | |
788 | */ | |
789 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
790 | /* | |
791 | * For the extra BIDI-COMMAND READ struct request we do not | |
792 | * need to setup the remaining structure members | |
793 | */ | |
794 | if (bidi_read) | |
795 | return; | |
796 | /* | |
797 | * Setup the done function pointer for struct request, | |
798 | * also set the end_io_data pointer.to struct se_task. | |
799 | */ | |
800 | req->end_io = pscsi_req_done; | |
5951146d | 801 | req->end_io_data = task; |
c66ac9db NB |
802 | /* |
803 | * Load the referenced struct se_task's SCSI CDB into | |
804 | * include/linux/blkdev.h:struct request->cmd | |
805 | */ | |
806 | req->cmd_len = scsi_command_size(pt->pscsi_cdb); | |
807 | req->cmd = &pt->pscsi_cdb[0]; | |
808 | /* | |
809 | * Setup pointer for outgoing sense data. | |
810 | */ | |
5951146d | 811 | req->sense = &pt->pscsi_sense[0]; |
c66ac9db NB |
812 | req->sense_len = 0; |
813 | } | |
814 | ||
815 | /* | |
816 | * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB | |
817 | */ | |
818 | static int pscsi_blk_get_request(struct se_task *task) | |
819 | { | |
820 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
821 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
822 | ||
823 | pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue, | |
824 | (task->task_data_direction == DMA_TO_DEVICE), | |
825 | GFP_KERNEL); | |
6708bb27 AG |
826 | if (!pt->pscsi_req || IS_ERR(pt->pscsi_req)) { |
827 | pr_err("PSCSI: blk_get_request() failed: %ld\n", | |
c66ac9db NB |
828 | IS_ERR(pt->pscsi_req)); |
829 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
830 | } | |
831 | /* | |
832 | * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, | |
833 | * and setup rq callback, CDB and sense. | |
834 | */ | |
835 | pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); | |
836 | return 0; | |
837 | } | |
838 | ||
839 | /* pscsi_do_task(): (Part of se_subsystem_api_t template) | |
840 | * | |
841 | * | |
842 | */ | |
843 | static int pscsi_do_task(struct se_task *task) | |
844 | { | |
845 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
846 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
847 | /* | |
848 | * Set the struct request->timeout value based on peripheral | |
849 | * device type from SCSI. | |
850 | */ | |
851 | if (pdv->pdv_sd->type == TYPE_DISK) | |
852 | pt->pscsi_req->timeout = PS_TIMEOUT_DISK; | |
853 | else | |
854 | pt->pscsi_req->timeout = PS_TIMEOUT_OTHER; | |
855 | ||
856 | pt->pscsi_req->retries = PS_RETRY; | |
857 | /* | |
858 | * Queue the struct request into the struct scsi_device->request_queue. | |
859 | * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd | |
860 | * descriptor | |
861 | */ | |
862 | blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req, | |
e66ecd50 | 863 | (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG), |
c66ac9db NB |
864 | pscsi_req_done); |
865 | ||
866 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
867 | } | |
868 | ||
869 | static void pscsi_free_task(struct se_task *task) | |
870 | { | |
871 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
c66ac9db | 872 | |
c66ac9db NB |
873 | /* |
874 | * We do not release the bio(s) here associated with this task, as | |
875 | * this is handled by bio_put() and pscsi_bi_endio(). | |
876 | */ | |
877 | kfree(pt); | |
878 | } | |
879 | ||
880 | enum { | |
881 | Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, | |
882 | Opt_scsi_lun_id, Opt_err | |
883 | }; | |
884 | ||
885 | static match_table_t tokens = { | |
886 | {Opt_scsi_host_id, "scsi_host_id=%d"}, | |
887 | {Opt_scsi_channel_id, "scsi_channel_id=%d"}, | |
888 | {Opt_scsi_target_id, "scsi_target_id=%d"}, | |
889 | {Opt_scsi_lun_id, "scsi_lun_id=%d"}, | |
890 | {Opt_err, NULL} | |
891 | }; | |
892 | ||
893 | static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba, | |
894 | struct se_subsystem_dev *se_dev, | |
895 | const char *page, | |
896 | ssize_t count) | |
897 | { | |
898 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
899 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
900 | char *orig, *ptr, *opts; | |
901 | substring_t args[MAX_OPT_ARGS]; | |
902 | int ret = 0, arg, token; | |
903 | ||
904 | opts = kstrdup(page, GFP_KERNEL); | |
905 | if (!opts) | |
906 | return -ENOMEM; | |
907 | ||
908 | orig = opts; | |
909 | ||
910 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
911 | if (!*ptr) | |
912 | continue; | |
913 | ||
914 | token = match_token(ptr, tokens, args); | |
915 | switch (token) { | |
916 | case Opt_scsi_host_id: | |
917 | if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { | |
6708bb27 | 918 | pr_err("PSCSI[%d]: Unable to accept" |
c66ac9db NB |
919 | " scsi_host_id while phv_mode ==" |
920 | " PHV_LLD_SCSI_HOST_NO\n", | |
921 | phv->phv_host_id); | |
922 | ret = -EINVAL; | |
923 | goto out; | |
924 | } | |
925 | match_int(args, &arg); | |
926 | pdv->pdv_host_id = arg; | |
6708bb27 | 927 | pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" |
c66ac9db NB |
928 | " %d\n", phv->phv_host_id, pdv->pdv_host_id); |
929 | pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; | |
930 | break; | |
931 | case Opt_scsi_channel_id: | |
932 | match_int(args, &arg); | |
933 | pdv->pdv_channel_id = arg; | |
6708bb27 | 934 | pr_debug("PSCSI[%d]: Referencing SCSI Channel" |
c66ac9db NB |
935 | " ID: %d\n", phv->phv_host_id, |
936 | pdv->pdv_channel_id); | |
937 | pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; | |
938 | break; | |
939 | case Opt_scsi_target_id: | |
940 | match_int(args, &arg); | |
941 | pdv->pdv_target_id = arg; | |
6708bb27 | 942 | pr_debug("PSCSI[%d]: Referencing SCSI Target" |
c66ac9db NB |
943 | " ID: %d\n", phv->phv_host_id, |
944 | pdv->pdv_target_id); | |
945 | pdv->pdv_flags |= PDF_HAS_TARGET_ID; | |
946 | break; | |
947 | case Opt_scsi_lun_id: | |
948 | match_int(args, &arg); | |
949 | pdv->pdv_lun_id = arg; | |
6708bb27 | 950 | pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" |
c66ac9db NB |
951 | " %d\n", phv->phv_host_id, pdv->pdv_lun_id); |
952 | pdv->pdv_flags |= PDF_HAS_LUN_ID; | |
953 | break; | |
954 | default: | |
955 | break; | |
956 | } | |
957 | } | |
958 | ||
959 | out: | |
960 | kfree(orig); | |
961 | return (!ret) ? count : ret; | |
962 | } | |
963 | ||
964 | static ssize_t pscsi_check_configfs_dev_params( | |
965 | struct se_hba *hba, | |
966 | struct se_subsystem_dev *se_dev) | |
967 | { | |
968 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
969 | ||
970 | if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || | |
971 | !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || | |
972 | !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { | |
6708bb27 | 973 | pr_err("Missing scsi_channel_id=, scsi_target_id= and" |
c66ac9db | 974 | " scsi_lun_id= parameters\n"); |
e3d6f909 | 975 | return -EINVAL; |
c66ac9db NB |
976 | } |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba, | |
982 | struct se_subsystem_dev *se_dev, | |
983 | char *b) | |
984 | { | |
985 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
986 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
987 | struct scsi_device *sd = pdv->pdv_sd; | |
988 | unsigned char host_id[16]; | |
989 | ssize_t bl; | |
990 | int i; | |
991 | ||
992 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) | |
993 | snprintf(host_id, 16, "%d", pdv->pdv_host_id); | |
994 | else | |
995 | snprintf(host_id, 16, "PHBA Mode"); | |
996 | ||
997 | bl = sprintf(b, "SCSI Device Bus Location:" | |
998 | " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", | |
999 | pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, | |
1000 | host_id); | |
1001 | ||
1002 | if (sd) { | |
1003 | bl += sprintf(b + bl, " "); | |
1004 | bl += sprintf(b + bl, "Vendor: "); | |
1005 | for (i = 0; i < 8; i++) { | |
1006 | if (ISPRINT(sd->vendor[i])) /* printable character? */ | |
1007 | bl += sprintf(b + bl, "%c", sd->vendor[i]); | |
1008 | else | |
1009 | bl += sprintf(b + bl, " "); | |
1010 | } | |
1011 | bl += sprintf(b + bl, " Model: "); | |
1012 | for (i = 0; i < 16; i++) { | |
1013 | if (ISPRINT(sd->model[i])) /* printable character ? */ | |
1014 | bl += sprintf(b + bl, "%c", sd->model[i]); | |
1015 | else | |
1016 | bl += sprintf(b + bl, " "); | |
1017 | } | |
1018 | bl += sprintf(b + bl, " Rev: "); | |
1019 | for (i = 0; i < 4; i++) { | |
1020 | if (ISPRINT(sd->rev[i])) /* printable character ? */ | |
1021 | bl += sprintf(b + bl, "%c", sd->rev[i]); | |
1022 | else | |
1023 | bl += sprintf(b + bl, " "); | |
1024 | } | |
1025 | bl += sprintf(b + bl, "\n"); | |
1026 | } | |
1027 | return bl; | |
1028 | } | |
1029 | ||
1030 | static void pscsi_bi_endio(struct bio *bio, int error) | |
1031 | { | |
1032 | bio_put(bio); | |
1033 | } | |
1034 | ||
a1d8b49a | 1035 | static inline struct bio *pscsi_get_bio(int sg_num) |
c66ac9db NB |
1036 | { |
1037 | struct bio *bio; | |
1038 | /* | |
1039 | * Use bio_malloc() following the comment in for bio -> struct request | |
1040 | * in block/blk-core.c:blk_make_request() | |
1041 | */ | |
1042 | bio = bio_kmalloc(GFP_KERNEL, sg_num); | |
6708bb27 AG |
1043 | if (!bio) { |
1044 | pr_err("PSCSI: bio_kmalloc() failed\n"); | |
c66ac9db NB |
1045 | return NULL; |
1046 | } | |
1047 | bio->bi_end_io = pscsi_bi_endio; | |
1048 | ||
1049 | return bio; | |
1050 | } | |
1051 | ||
1d20bb61 | 1052 | static int __pscsi_map_SG( |
c66ac9db NB |
1053 | struct se_task *task, |
1054 | struct scatterlist *task_sg, | |
1055 | u32 task_sg_num, | |
1056 | int bidi_read) | |
1057 | { | |
1058 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1059 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
1060 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; | |
1061 | struct page *page; | |
1062 | struct scatterlist *sg; | |
1063 | u32 data_len = task->task_size, i, len, bytes, off; | |
1064 | int nr_pages = (task->task_size + task_sg[0].offset + | |
1065 | PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1066 | int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; | |
1067 | int rw = (task->task_data_direction == DMA_TO_DEVICE); | |
1068 | ||
1069 | if (!task->task_size) | |
1070 | return 0; | |
1071 | /* | |
1072 | * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup | |
ec98f782 | 1073 | * the bio_vec maplist from task->task_sg -> |
c66ac9db NB |
1074 | * struct scatterlist memory. The struct se_task->task_sg[] currently needs |
1075 | * to be attached to struct bios for submission to Linux/SCSI using | |
1076 | * struct request to struct scsi_device->request_queue. | |
1077 | * | |
1078 | * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI | |
1079 | * is ported to upstream SCSI passthrough functionality that accepts | |
1080 | * struct scatterlist->page_link or struct page as a paraemeter. | |
1081 | */ | |
6708bb27 | 1082 | pr_debug("PSCSI: nr_pages: %d\n", nr_pages); |
c66ac9db NB |
1083 | |
1084 | for_each_sg(task_sg, sg, task_sg_num, i) { | |
1085 | page = sg_page(sg); | |
1086 | off = sg->offset; | |
1087 | len = sg->length; | |
1088 | ||
6708bb27 | 1089 | pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, |
c66ac9db NB |
1090 | page, len, off); |
1091 | ||
1092 | while (len > 0 && data_len > 0) { | |
1093 | bytes = min_t(unsigned int, len, PAGE_SIZE - off); | |
1094 | bytes = min(bytes, data_len); | |
1095 | ||
6708bb27 | 1096 | if (!bio) { |
c66ac9db NB |
1097 | nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); |
1098 | nr_pages -= nr_vecs; | |
1099 | /* | |
1100 | * Calls bio_kmalloc() and sets bio->bi_end_io() | |
1101 | */ | |
a1d8b49a | 1102 | bio = pscsi_get_bio(nr_vecs); |
6708bb27 | 1103 | if (!bio) |
c66ac9db NB |
1104 | goto fail; |
1105 | ||
1106 | if (rw) | |
1107 | bio->bi_rw |= REQ_WRITE; | |
1108 | ||
6708bb27 | 1109 | pr_debug("PSCSI: Allocated bio: %p," |
c66ac9db NB |
1110 | " dir: %s nr_vecs: %d\n", bio, |
1111 | (rw) ? "rw" : "r", nr_vecs); | |
1112 | /* | |
1113 | * Set *hbio pointer to handle the case: | |
1114 | * nr_pages > BIO_MAX_PAGES, where additional | |
1115 | * bios need to be added to complete a given | |
1116 | * struct se_task | |
1117 | */ | |
1118 | if (!hbio) | |
1119 | hbio = tbio = bio; | |
1120 | else | |
1121 | tbio = tbio->bi_next = bio; | |
1122 | } | |
1123 | ||
6708bb27 | 1124 | pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" |
c66ac9db NB |
1125 | " bio: %p page: %p len: %d off: %d\n", i, bio, |
1126 | page, len, off); | |
1127 | ||
1128 | rc = bio_add_pc_page(pdv->pdv_sd->request_queue, | |
1129 | bio, page, bytes, off); | |
1130 | if (rc != bytes) | |
1131 | goto fail; | |
1132 | ||
6708bb27 | 1133 | pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", |
c66ac9db NB |
1134 | bio->bi_vcnt, nr_vecs); |
1135 | ||
1136 | if (bio->bi_vcnt > nr_vecs) { | |
6708bb27 | 1137 | pr_debug("PSCSI: Reached bio->bi_vcnt max:" |
c66ac9db NB |
1138 | " %d i: %d bio: %p, allocating another" |
1139 | " bio\n", bio->bi_vcnt, i, bio); | |
1140 | /* | |
1141 | * Clear the pointer so that another bio will | |
1142 | * be allocated with pscsi_get_bio() above, the | |
1143 | * current bio has already been set *tbio and | |
1144 | * bio->bi_next. | |
1145 | */ | |
1146 | bio = NULL; | |
1147 | } | |
1148 | ||
1149 | page++; | |
1150 | len -= bytes; | |
1151 | data_len -= bytes; | |
1152 | off = 0; | |
1153 | } | |
1154 | } | |
1155 | /* | |
1156 | * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND | |
1157 | * primary SCSI WRITE poayload mapped for struct se_task->task_sg[] | |
1158 | */ | |
6708bb27 | 1159 | if (!bidi_read) { |
c66ac9db NB |
1160 | /* |
1161 | * Starting with v2.6.31, call blk_make_request() passing in *hbio to | |
1162 | * allocate the pSCSI task a struct request. | |
1163 | */ | |
1164 | pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue, | |
1165 | hbio, GFP_KERNEL); | |
6708bb27 AG |
1166 | if (!pt->pscsi_req) { |
1167 | pr_err("pSCSI: blk_make_request() failed\n"); | |
c66ac9db NB |
1168 | goto fail; |
1169 | } | |
1170 | /* | |
1171 | * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, | |
1172 | * and setup rq callback, CDB and sense. | |
1173 | */ | |
1174 | pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); | |
1175 | ||
6708bb27 | 1176 | return task->task_sg_nents; |
c66ac9db NB |
1177 | } |
1178 | /* | |
1179 | * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND | |
1180 | * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[] | |
1181 | */ | |
1182 | pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue, | |
1183 | hbio, GFP_KERNEL); | |
6708bb27 AG |
1184 | if (!pt->pscsi_req->next_rq) { |
1185 | pr_err("pSCSI: blk_make_request() failed for BIDI\n"); | |
c66ac9db NB |
1186 | goto fail; |
1187 | } | |
1188 | pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1); | |
1189 | ||
6708bb27 | 1190 | return task->task_sg_nents; |
c66ac9db NB |
1191 | fail: |
1192 | while (hbio) { | |
1193 | bio = hbio; | |
1194 | hbio = hbio->bi_next; | |
1195 | bio->bi_next = NULL; | |
1196 | bio_endio(bio, 0); | |
1197 | } | |
1198 | return ret; | |
1199 | } | |
1200 | ||
1d20bb61 NB |
1201 | /* |
1202 | * pSCSI maps both ->map_control_SG() and ->map_data_SG() to a single call. | |
1203 | */ | |
1204 | static int pscsi_map_SG(struct se_task *task) | |
c66ac9db NB |
1205 | { |
1206 | int ret; | |
1207 | ||
1208 | /* | |
1209 | * Setup the main struct request for the task->task_sg[] payload | |
1210 | */ | |
1211 | ||
1d20bb61 | 1212 | ret = __pscsi_map_SG(task, task->task_sg, task->task_sg_nents, 0); |
c66ac9db NB |
1213 | if (ret >= 0 && task->task_sg_bidi) { |
1214 | /* | |
1215 | * If present, set up the extra BIDI-COMMAND SCSI READ | |
1216 | * struct request and payload. | |
1217 | */ | |
1d20bb61 | 1218 | ret = __pscsi_map_SG(task, task->task_sg_bidi, |
6708bb27 | 1219 | task->task_sg_nents, 1); |
c66ac9db NB |
1220 | } |
1221 | ||
1222 | if (ret < 0) | |
1223 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
1224 | return 0; | |
1225 | } | |
1226 | ||
c66ac9db NB |
1227 | static int pscsi_CDB_none(struct se_task *task) |
1228 | { | |
1229 | return pscsi_blk_get_request(task); | |
1230 | } | |
1231 | ||
1232 | /* pscsi_get_cdb(): | |
1233 | * | |
1234 | * | |
1235 | */ | |
1236 | static unsigned char *pscsi_get_cdb(struct se_task *task) | |
1237 | { | |
1238 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1239 | ||
1240 | return pt->pscsi_cdb; | |
1241 | } | |
1242 | ||
1243 | /* pscsi_get_sense_buffer(): | |
1244 | * | |
1245 | * | |
1246 | */ | |
1247 | static unsigned char *pscsi_get_sense_buffer(struct se_task *task) | |
1248 | { | |
1249 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1250 | ||
1251 | return (unsigned char *)&pt->pscsi_sense[0]; | |
1252 | } | |
1253 | ||
1254 | /* pscsi_get_device_rev(): | |
1255 | * | |
1256 | * | |
1257 | */ | |
1258 | static u32 pscsi_get_device_rev(struct se_device *dev) | |
1259 | { | |
1260 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1261 | struct scsi_device *sd = pdv->pdv_sd; | |
1262 | ||
1263 | return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1; | |
1264 | } | |
1265 | ||
1266 | /* pscsi_get_device_type(): | |
1267 | * | |
1268 | * | |
1269 | */ | |
1270 | static u32 pscsi_get_device_type(struct se_device *dev) | |
1271 | { | |
1272 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1273 | struct scsi_device *sd = pdv->pdv_sd; | |
1274 | ||
1275 | return sd->type; | |
1276 | } | |
1277 | ||
1278 | static sector_t pscsi_get_blocks(struct se_device *dev) | |
1279 | { | |
1280 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1281 | ||
1282 | if (pdv->pdv_bd && pdv->pdv_bd->bd_part) | |
1283 | return pdv->pdv_bd->bd_part->nr_sects; | |
1284 | ||
1285 | dump_stack(); | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /* pscsi_handle_SAM_STATUS_failures(): | |
1290 | * | |
1291 | * | |
1292 | */ | |
1293 | static inline void pscsi_process_SAM_status( | |
1294 | struct se_task *task, | |
1295 | struct pscsi_plugin_task *pt) | |
1296 | { | |
1297 | task->task_scsi_status = status_byte(pt->pscsi_result); | |
6708bb27 | 1298 | if (task->task_scsi_status) { |
c66ac9db | 1299 | task->task_scsi_status <<= 1; |
6708bb27 | 1300 | pr_debug("PSCSI Status Byte exception at task: %p CDB:" |
c66ac9db NB |
1301 | " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], |
1302 | pt->pscsi_result); | |
1303 | } | |
1304 | ||
1305 | switch (host_byte(pt->pscsi_result)) { | |
1306 | case DID_OK: | |
1307 | transport_complete_task(task, (!task->task_scsi_status)); | |
1308 | break; | |
1309 | default: | |
6708bb27 | 1310 | pr_debug("PSCSI Host Byte exception at task: %p CDB:" |
c66ac9db NB |
1311 | " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], |
1312 | pt->pscsi_result); | |
1313 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
1314 | task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
e3d6f909 | 1315 | task->task_se_cmd->transport_error_status = |
c66ac9db NB |
1316 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
1317 | transport_complete_task(task, 0); | |
1318 | break; | |
1319 | } | |
c66ac9db NB |
1320 | } |
1321 | ||
1322 | static void pscsi_req_done(struct request *req, int uptodate) | |
1323 | { | |
1324 | struct se_task *task = req->end_io_data; | |
1325 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1326 | ||
1327 | pt->pscsi_result = req->errors; | |
1328 | pt->pscsi_resid = req->resid_len; | |
1329 | ||
1330 | pscsi_process_SAM_status(task, pt); | |
1331 | /* | |
1332 | * Release BIDI-READ if present | |
1333 | */ | |
1334 | if (req->next_rq != NULL) | |
1335 | __blk_put_request(req->q, req->next_rq); | |
1336 | ||
1337 | __blk_put_request(req->q, req); | |
1338 | pt->pscsi_req = NULL; | |
1339 | } | |
1340 | ||
1341 | static struct se_subsystem_api pscsi_template = { | |
1342 | .name = "pscsi", | |
1343 | .owner = THIS_MODULE, | |
1344 | .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, | |
1345 | .cdb_none = pscsi_CDB_none, | |
1d20bb61 NB |
1346 | .map_control_SG = pscsi_map_SG, |
1347 | .map_data_SG = pscsi_map_SG, | |
c66ac9db NB |
1348 | .attach_hba = pscsi_attach_hba, |
1349 | .detach_hba = pscsi_detach_hba, | |
1350 | .pmode_enable_hba = pscsi_pmode_enable_hba, | |
1351 | .allocate_virtdevice = pscsi_allocate_virtdevice, | |
1352 | .create_virtdevice = pscsi_create_virtdevice, | |
1353 | .free_device = pscsi_free_device, | |
1354 | .transport_complete = pscsi_transport_complete, | |
1355 | .alloc_task = pscsi_alloc_task, | |
1356 | .do_task = pscsi_do_task, | |
1357 | .free_task = pscsi_free_task, | |
1358 | .check_configfs_dev_params = pscsi_check_configfs_dev_params, | |
1359 | .set_configfs_dev_params = pscsi_set_configfs_dev_params, | |
1360 | .show_configfs_dev_params = pscsi_show_configfs_dev_params, | |
1361 | .get_cdb = pscsi_get_cdb, | |
1362 | .get_sense_buffer = pscsi_get_sense_buffer, | |
1363 | .get_device_rev = pscsi_get_device_rev, | |
1364 | .get_device_type = pscsi_get_device_type, | |
1365 | .get_blocks = pscsi_get_blocks, | |
1366 | }; | |
1367 | ||
1368 | static int __init pscsi_module_init(void) | |
1369 | { | |
1370 | return transport_subsystem_register(&pscsi_template); | |
1371 | } | |
1372 | ||
1373 | static void pscsi_module_exit(void) | |
1374 | { | |
1375 | transport_subsystem_release(&pscsi_template); | |
1376 | } | |
1377 | ||
1378 | MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); | |
1379 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
1380 | MODULE_LICENSE("GPL"); | |
1381 | ||
1382 | module_init(pscsi_module_init); | |
1383 | module_exit(pscsi_module_exit); |