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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_pscsi.c | |
3 | * | |
4 | * This file contains the generic target mode <-> Linux SCSI subsystem plugin. | |
5 | * | |
6 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
29 | #include <linux/version.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/parser.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/blkdev.h> | |
34 | #include <linux/blk_types.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/spinlock.h> | |
c66ac9db NB |
37 | #include <linux/genhd.h> |
38 | #include <linux/cdrom.h> | |
39 | #include <linux/file.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_device.h> | |
42 | #include <scsi/scsi_cmnd.h> | |
43 | #include <scsi/scsi_host.h> | |
44 | #include <scsi/libsas.h> /* For TASK_ATTR_* */ | |
45 | ||
46 | #include <target/target_core_base.h> | |
47 | #include <target/target_core_device.h> | |
48 | #include <target/target_core_transport.h> | |
49 | ||
50 | #include "target_core_pscsi.h" | |
51 | ||
52 | #define ISPRINT(a) ((a >= ' ') && (a <= '~')) | |
53 | ||
54 | static struct se_subsystem_api pscsi_template; | |
55 | ||
56 | static void pscsi_req_done(struct request *, int); | |
57 | ||
58 | /* pscsi_get_sh(): | |
59 | * | |
60 | * | |
61 | */ | |
62 | static struct Scsi_Host *pscsi_get_sh(u32 host_no) | |
63 | { | |
64 | struct Scsi_Host *sh = NULL; | |
65 | ||
66 | sh = scsi_host_lookup(host_no); | |
67 | if (IS_ERR(sh)) { | |
68 | printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:" | |
69 | " %u\n", host_no); | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | return sh; | |
74 | } | |
75 | ||
76 | /* pscsi_attach_hba(): | |
77 | * | |
78 | * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. | |
79 | * from the passed SCSI Host ID. | |
80 | */ | |
81 | static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) | |
82 | { | |
83 | int hba_depth; | |
84 | struct pscsi_hba_virt *phv; | |
85 | ||
86 | phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); | |
87 | if (!(phv)) { | |
88 | printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n"); | |
89 | return -1; | |
90 | } | |
91 | phv->phv_host_id = host_id; | |
92 | phv->phv_mode = PHV_VIRUTAL_HOST_ID; | |
93 | hba_depth = PSCSI_VIRTUAL_HBA_DEPTH; | |
94 | atomic_set(&hba->left_queue_depth, hba_depth); | |
95 | atomic_set(&hba->max_queue_depth, hba_depth); | |
96 | ||
97 | hba->hba_ptr = (void *)phv; | |
98 | ||
99 | printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on" | |
100 | " Generic Target Core Stack %s\n", hba->hba_id, | |
101 | PSCSI_VERSION, TARGET_CORE_MOD_VERSION); | |
102 | printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic" | |
103 | " Target Core with TCQ Depth: %d\n", hba->hba_id, | |
104 | atomic_read(&hba->max_queue_depth)); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static void pscsi_detach_hba(struct se_hba *hba) | |
110 | { | |
111 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
112 | struct Scsi_Host *scsi_host = phv->phv_lld_host; | |
113 | ||
114 | if (scsi_host) { | |
115 | scsi_host_put(scsi_host); | |
116 | ||
117 | printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from" | |
118 | " Generic Target Core\n", hba->hba_id, | |
119 | (scsi_host->hostt->name) ? (scsi_host->hostt->name) : | |
120 | "Unknown"); | |
121 | } else | |
122 | printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA" | |
123 | " from Generic Target Core\n", hba->hba_id); | |
124 | ||
125 | kfree(phv); | |
126 | hba->hba_ptr = NULL; | |
127 | } | |
128 | ||
129 | static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) | |
130 | { | |
131 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; | |
132 | struct Scsi_Host *sh = phv->phv_lld_host; | |
133 | int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH; | |
134 | /* | |
135 | * Release the struct Scsi_Host | |
136 | */ | |
137 | if (!(mode_flag)) { | |
138 | if (!(sh)) | |
139 | return 0; | |
140 | ||
141 | phv->phv_lld_host = NULL; | |
142 | phv->phv_mode = PHV_VIRUTAL_HOST_ID; | |
143 | atomic_set(&hba->left_queue_depth, hba_depth); | |
144 | atomic_set(&hba->max_queue_depth, hba_depth); | |
145 | ||
146 | printk(KERN_INFO "CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" | |
147 | " %s\n", hba->hba_id, (sh->hostt->name) ? | |
148 | (sh->hostt->name) : "Unknown"); | |
149 | ||
150 | scsi_host_put(sh); | |
151 | return 0; | |
152 | } | |
153 | /* | |
154 | * Otherwise, locate struct Scsi_Host from the original passed | |
155 | * pSCSI Host ID and enable for phba mode | |
156 | */ | |
157 | sh = pscsi_get_sh(phv->phv_host_id); | |
158 | if (!(sh)) { | |
159 | printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for" | |
160 | " phv_host_id: %d\n", phv->phv_host_id); | |
161 | return -1; | |
162 | } | |
163 | /* | |
164 | * Usually the SCSI LLD will use the hostt->can_queue value to define | |
165 | * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set | |
166 | * this at all and set sh->can_queue at runtime. | |
167 | */ | |
168 | hba_depth = (sh->hostt->can_queue > sh->can_queue) ? | |
169 | sh->hostt->can_queue : sh->can_queue; | |
170 | ||
171 | atomic_set(&hba->left_queue_depth, hba_depth); | |
172 | atomic_set(&hba->max_queue_depth, hba_depth); | |
173 | ||
174 | phv->phv_lld_host = sh; | |
175 | phv->phv_mode = PHV_LLD_SCSI_HOST_NO; | |
176 | ||
177 | printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", | |
178 | hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); | |
179 | ||
180 | return 1; | |
181 | } | |
182 | ||
183 | static void pscsi_tape_read_blocksize(struct se_device *dev, | |
184 | struct scsi_device *sdev) | |
185 | { | |
186 | unsigned char cdb[MAX_COMMAND_SIZE], *buf; | |
187 | int ret; | |
188 | ||
189 | buf = kzalloc(12, GFP_KERNEL); | |
190 | if (!buf) | |
191 | return; | |
192 | ||
193 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
194 | cdb[0] = MODE_SENSE; | |
195 | cdb[4] = 0x0c; /* 12 bytes */ | |
196 | ||
197 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, | |
198 | HZ, 1, NULL); | |
199 | if (ret) | |
200 | goto out_free; | |
201 | ||
202 | /* | |
203 | * If MODE_SENSE still returns zero, set the default value to 1024. | |
204 | */ | |
205 | sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); | |
206 | if (!sdev->sector_size) | |
207 | sdev->sector_size = 1024; | |
208 | out_free: | |
209 | kfree(buf); | |
210 | } | |
211 | ||
212 | static void | |
213 | pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) | |
214 | { | |
215 | unsigned char *buf; | |
216 | ||
217 | if (sdev->inquiry_len < INQUIRY_LEN) | |
218 | return; | |
219 | ||
220 | buf = sdev->inquiry; | |
221 | if (!buf) | |
222 | return; | |
223 | /* | |
224 | * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() | |
225 | */ | |
226 | memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); | |
227 | memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); | |
228 | memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); | |
229 | } | |
230 | ||
231 | static int | |
232 | pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) | |
233 | { | |
234 | unsigned char cdb[MAX_COMMAND_SIZE], *buf; | |
235 | int ret; | |
236 | ||
237 | buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); | |
238 | if (!buf) | |
239 | return -1; | |
240 | ||
241 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
242 | cdb[0] = INQUIRY; | |
243 | cdb[1] = 0x01; /* Query VPD */ | |
244 | cdb[2] = 0x80; /* Unit Serial Number */ | |
245 | cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; | |
246 | cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); | |
247 | ||
248 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, | |
249 | INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); | |
250 | if (ret) | |
251 | goto out_free; | |
252 | ||
253 | snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); | |
254 | ||
255 | wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL; | |
256 | ||
257 | kfree(buf); | |
258 | return 0; | |
259 | ||
260 | out_free: | |
261 | kfree(buf); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | static void | |
266 | pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, | |
267 | struct t10_wwn *wwn) | |
268 | { | |
269 | unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; | |
270 | int ident_len, page_len, off = 4, ret; | |
271 | struct t10_vpd *vpd; | |
272 | ||
273 | buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); | |
274 | if (!buf) | |
275 | return; | |
276 | ||
277 | memset(cdb, 0, MAX_COMMAND_SIZE); | |
278 | cdb[0] = INQUIRY; | |
279 | cdb[1] = 0x01; /* Query VPD */ | |
280 | cdb[2] = 0x83; /* Device Identifier */ | |
281 | cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; | |
282 | cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); | |
283 | ||
284 | ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, | |
285 | INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, | |
286 | NULL, HZ, 1, NULL); | |
287 | if (ret) | |
288 | goto out; | |
289 | ||
290 | page_len = (buf[2] << 8) | buf[3]; | |
291 | while (page_len > 0) { | |
292 | /* Grab a pointer to the Identification descriptor */ | |
293 | page_83 = &buf[off]; | |
294 | ident_len = page_83[3]; | |
295 | if (!ident_len) { | |
296 | printk(KERN_ERR "page_83[3]: identifier" | |
297 | " length zero!\n"); | |
298 | break; | |
299 | } | |
300 | printk(KERN_INFO "T10 VPD Identifer Length: %d\n", ident_len); | |
301 | ||
302 | vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); | |
303 | if (!vpd) { | |
304 | printk(KERN_ERR "Unable to allocate memory for" | |
305 | " struct t10_vpd\n"); | |
306 | goto out; | |
307 | } | |
308 | INIT_LIST_HEAD(&vpd->vpd_list); | |
309 | ||
310 | transport_set_vpd_proto_id(vpd, page_83); | |
311 | transport_set_vpd_assoc(vpd, page_83); | |
312 | ||
313 | if (transport_set_vpd_ident_type(vpd, page_83) < 0) { | |
314 | off += (ident_len + 4); | |
315 | page_len -= (ident_len + 4); | |
316 | kfree(vpd); | |
317 | continue; | |
318 | } | |
319 | if (transport_set_vpd_ident(vpd, page_83) < 0) { | |
320 | off += (ident_len + 4); | |
321 | page_len -= (ident_len + 4); | |
322 | kfree(vpd); | |
323 | continue; | |
324 | } | |
325 | ||
326 | list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); | |
327 | off += (ident_len + 4); | |
328 | page_len -= (ident_len + 4); | |
329 | } | |
330 | ||
331 | out: | |
332 | kfree(buf); | |
333 | } | |
334 | ||
335 | /* pscsi_add_device_to_list(): | |
336 | * | |
337 | * | |
338 | */ | |
339 | static struct se_device *pscsi_add_device_to_list( | |
340 | struct se_hba *hba, | |
341 | struct se_subsystem_dev *se_dev, | |
342 | struct pscsi_dev_virt *pdv, | |
343 | struct scsi_device *sd, | |
344 | int dev_flags) | |
345 | { | |
346 | struct se_device *dev; | |
347 | struct se_dev_limits dev_limits; | |
348 | struct request_queue *q; | |
349 | struct queue_limits *limits; | |
350 | ||
351 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
352 | ||
353 | if (!sd->queue_depth) { | |
354 | sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; | |
355 | ||
356 | printk(KERN_ERR "Set broken SCSI Device %d:%d:%d" | |
357 | " queue_depth to %d\n", sd->channel, sd->id, | |
358 | sd->lun, sd->queue_depth); | |
359 | } | |
360 | /* | |
361 | * Setup the local scope queue_limits from struct request_queue->limits | |
362 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
363 | */ | |
364 | q = sd->request_queue; | |
365 | limits = &dev_limits.limits; | |
366 | limits->logical_block_size = sd->sector_size; | |
367 | limits->max_hw_sectors = (sd->host->max_sectors > queue_max_hw_sectors(q)) ? | |
368 | queue_max_hw_sectors(q) : sd->host->max_sectors; | |
369 | limits->max_sectors = (sd->host->max_sectors > queue_max_sectors(q)) ? | |
370 | queue_max_sectors(q) : sd->host->max_sectors; | |
371 | dev_limits.hw_queue_depth = sd->queue_depth; | |
372 | dev_limits.queue_depth = sd->queue_depth; | |
373 | /* | |
374 | * Setup our standard INQUIRY info into se_dev->t10_wwn | |
375 | */ | |
376 | pscsi_set_inquiry_info(sd, &se_dev->t10_wwn); | |
377 | ||
378 | /* | |
379 | * Set the pointer pdv->pdv_sd to from passed struct scsi_device, | |
380 | * which has already been referenced with Linux SCSI code with | |
381 | * scsi_device_get() in this file's pscsi_create_virtdevice(). | |
382 | * | |
383 | * The passthrough operations called by the transport_add_device_* | |
384 | * function below will require this pointer to be set for passthroug | |
385 | * ops. | |
386 | * | |
387 | * For the shutdown case in pscsi_free_device(), this struct | |
388 | * scsi_device reference is released with Linux SCSI code | |
389 | * scsi_device_put() and the pdv->pdv_sd cleared. | |
390 | */ | |
391 | pdv->pdv_sd = sd; | |
392 | ||
393 | dev = transport_add_device_to_core_hba(hba, &pscsi_template, | |
394 | se_dev, dev_flags, (void *)pdv, | |
395 | &dev_limits, NULL, NULL); | |
396 | if (!(dev)) { | |
397 | pdv->pdv_sd = NULL; | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Locate VPD WWN Information used for various purposes within | |
403 | * the Storage Engine. | |
404 | */ | |
405 | if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) { | |
406 | /* | |
407 | * If VPD Unit Serial returned GOOD status, try | |
408 | * VPD Device Identification page (0x83). | |
409 | */ | |
410 | pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn); | |
411 | } | |
412 | ||
413 | /* | |
414 | * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. | |
415 | */ | |
416 | if (sd->type == TYPE_TAPE) | |
417 | pscsi_tape_read_blocksize(dev, sd); | |
418 | return dev; | |
419 | } | |
420 | ||
421 | static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name) | |
422 | { | |
423 | struct pscsi_dev_virt *pdv; | |
424 | ||
425 | pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); | |
426 | if (!(pdv)) { | |
427 | printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n"); | |
428 | return NULL; | |
429 | } | |
430 | pdv->pdv_se_hba = hba; | |
431 | ||
432 | printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name); | |
433 | return (void *)pdv; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Called with struct Scsi_Host->host_lock called. | |
438 | */ | |
439 | static struct se_device *pscsi_create_type_disk( | |
440 | struct scsi_device *sd, | |
441 | struct pscsi_dev_virt *pdv, | |
442 | struct se_subsystem_dev *se_dev, | |
443 | struct se_hba *hba) | |
5dd7ed2e | 444 | __releases(sh->host_lock) |
c66ac9db NB |
445 | { |
446 | struct se_device *dev; | |
447 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
448 | struct Scsi_Host *sh = sd->host; | |
449 | struct block_device *bd; | |
450 | u32 dev_flags = 0; | |
451 | ||
452 | if (scsi_device_get(sd)) { | |
453 | printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n", | |
454 | sh->host_no, sd->channel, sd->id, sd->lun); | |
455 | spin_unlock_irq(sh->host_lock); | |
456 | return NULL; | |
457 | } | |
458 | spin_unlock_irq(sh->host_lock); | |
459 | /* | |
460 | * Claim exclusive struct block_device access to struct scsi_device | |
461 | * for TYPE_DISK using supplied udev_path | |
462 | */ | |
463 | bd = blkdev_get_by_path(se_dev->se_dev_udev_path, | |
464 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); | |
3ae279d2 DC |
465 | if (IS_ERR(bd)) { |
466 | printk(KERN_ERR "pSCSI: blkdev_get_by_path() failed\n"); | |
c66ac9db NB |
467 | scsi_device_put(sd); |
468 | return NULL; | |
469 | } | |
470 | pdv->pdv_bd = bd; | |
471 | ||
472 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
473 | if (!(dev)) { | |
474 | blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
475 | scsi_device_put(sd); | |
476 | return NULL; | |
477 | } | |
478 | printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n", | |
479 | phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); | |
480 | ||
481 | return dev; | |
482 | } | |
483 | ||
484 | /* | |
485 | * Called with struct Scsi_Host->host_lock called. | |
486 | */ | |
487 | static struct se_device *pscsi_create_type_rom( | |
488 | struct scsi_device *sd, | |
489 | struct pscsi_dev_virt *pdv, | |
490 | struct se_subsystem_dev *se_dev, | |
491 | struct se_hba *hba) | |
5dd7ed2e | 492 | __releases(sh->host_lock) |
c66ac9db NB |
493 | { |
494 | struct se_device *dev; | |
495 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
496 | struct Scsi_Host *sh = sd->host; | |
497 | u32 dev_flags = 0; | |
498 | ||
499 | if (scsi_device_get(sd)) { | |
500 | printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n", | |
501 | sh->host_no, sd->channel, sd->id, sd->lun); | |
502 | spin_unlock_irq(sh->host_lock); | |
503 | return NULL; | |
504 | } | |
505 | spin_unlock_irq(sh->host_lock); | |
506 | ||
507 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
508 | if (!(dev)) { | |
509 | scsi_device_put(sd); | |
510 | return NULL; | |
511 | } | |
512 | printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", | |
513 | phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, | |
514 | sd->channel, sd->id, sd->lun); | |
515 | ||
516 | return dev; | |
517 | } | |
518 | ||
519 | /* | |
520 | *Called with struct Scsi_Host->host_lock called. | |
521 | */ | |
522 | static struct se_device *pscsi_create_type_other( | |
523 | struct scsi_device *sd, | |
524 | struct pscsi_dev_virt *pdv, | |
525 | struct se_subsystem_dev *se_dev, | |
526 | struct se_hba *hba) | |
5dd7ed2e | 527 | __releases(sh->host_lock) |
c66ac9db NB |
528 | { |
529 | struct se_device *dev; | |
530 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; | |
531 | struct Scsi_Host *sh = sd->host; | |
532 | u32 dev_flags = 0; | |
533 | ||
534 | spin_unlock_irq(sh->host_lock); | |
535 | dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); | |
536 | if (!(dev)) | |
537 | return NULL; | |
538 | ||
539 | printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", | |
540 | phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, | |
541 | sd->channel, sd->id, sd->lun); | |
542 | ||
543 | return dev; | |
544 | } | |
545 | ||
546 | static struct se_device *pscsi_create_virtdevice( | |
547 | struct se_hba *hba, | |
548 | struct se_subsystem_dev *se_dev, | |
549 | void *p) | |
550 | { | |
551 | struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p; | |
552 | struct se_device *dev; | |
553 | struct scsi_device *sd; | |
554 | struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; | |
555 | struct Scsi_Host *sh = phv->phv_lld_host; | |
556 | int legacy_mode_enable = 0; | |
557 | ||
558 | if (!(pdv)) { | |
559 | printk(KERN_ERR "Unable to locate struct pscsi_dev_virt" | |
560 | " parameter\n"); | |
613640e4 | 561 | return ERR_PTR(-EINVAL); |
c66ac9db NB |
562 | } |
563 | /* | |
564 | * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the | |
565 | * struct Scsi_Host we will need to bring the TCM/pSCSI object online | |
566 | */ | |
567 | if (!(sh)) { | |
568 | if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { | |
569 | printk(KERN_ERR "pSCSI: Unable to locate struct" | |
570 | " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); | |
613640e4 | 571 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
572 | } |
573 | /* | |
574 | * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device | |
575 | * reference, we enforce that udev_path has been set | |
576 | */ | |
577 | if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) { | |
578 | printk(KERN_ERR "pSCSI: udev_path attribute has not" | |
579 | " been set before ENABLE=1\n"); | |
613640e4 | 580 | return ERR_PTR(-EINVAL); |
c66ac9db NB |
581 | } |
582 | /* | |
583 | * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID, | |
584 | * use the original TCM hba ID to reference Linux/SCSI Host No | |
585 | * and enable for PHV_LLD_SCSI_HOST_NO mode. | |
586 | */ | |
587 | if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { | |
588 | spin_lock(&hba->device_lock); | |
589 | if (!(list_empty(&hba->hba_dev_list))) { | |
590 | printk(KERN_ERR "pSCSI: Unable to set hba_mode" | |
591 | " with active devices\n"); | |
592 | spin_unlock(&hba->device_lock); | |
613640e4 | 593 | return ERR_PTR(-EEXIST); |
c66ac9db NB |
594 | } |
595 | spin_unlock(&hba->device_lock); | |
596 | ||
597 | if (pscsi_pmode_enable_hba(hba, 1) != 1) | |
613640e4 | 598 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
599 | |
600 | legacy_mode_enable = 1; | |
601 | hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; | |
602 | sh = phv->phv_lld_host; | |
603 | } else { | |
604 | sh = pscsi_get_sh(pdv->pdv_host_id); | |
605 | if (!(sh)) { | |
606 | printk(KERN_ERR "pSCSI: Unable to locate" | |
607 | " pdv_host_id: %d\n", pdv->pdv_host_id); | |
613640e4 | 608 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
609 | } |
610 | } | |
611 | } else { | |
612 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) { | |
613 | printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while" | |
614 | " struct Scsi_Host exists\n"); | |
613640e4 | 615 | return ERR_PTR(-EEXIST); |
c66ac9db NB |
616 | } |
617 | } | |
618 | ||
619 | spin_lock_irq(sh->host_lock); | |
620 | list_for_each_entry(sd, &sh->__devices, siblings) { | |
621 | if ((pdv->pdv_channel_id != sd->channel) || | |
622 | (pdv->pdv_target_id != sd->id) || | |
623 | (pdv->pdv_lun_id != sd->lun)) | |
624 | continue; | |
625 | /* | |
626 | * Functions will release the held struct scsi_host->host_lock | |
627 | * before calling calling pscsi_add_device_to_list() to register | |
628 | * struct scsi_device with target_core_mod. | |
629 | */ | |
630 | switch (sd->type) { | |
631 | case TYPE_DISK: | |
632 | dev = pscsi_create_type_disk(sd, pdv, se_dev, hba); | |
633 | break; | |
634 | case TYPE_ROM: | |
635 | dev = pscsi_create_type_rom(sd, pdv, se_dev, hba); | |
636 | break; | |
637 | default: | |
638 | dev = pscsi_create_type_other(sd, pdv, se_dev, hba); | |
639 | break; | |
640 | } | |
641 | ||
642 | if (!(dev)) { | |
643 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) | |
644 | scsi_host_put(sh); | |
645 | else if (legacy_mode_enable) { | |
646 | pscsi_pmode_enable_hba(hba, 0); | |
647 | hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; | |
648 | } | |
649 | pdv->pdv_sd = NULL; | |
613640e4 | 650 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
651 | } |
652 | return dev; | |
653 | } | |
654 | spin_unlock_irq(sh->host_lock); | |
655 | ||
656 | printk(KERN_ERR "pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, | |
657 | pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); | |
658 | ||
659 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) | |
660 | scsi_host_put(sh); | |
661 | else if (legacy_mode_enable) { | |
662 | pscsi_pmode_enable_hba(hba, 0); | |
663 | hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; | |
664 | } | |
665 | ||
613640e4 | 666 | return ERR_PTR(-ENODEV); |
c66ac9db NB |
667 | } |
668 | ||
669 | /* pscsi_free_device(): (Part of se_subsystem_api_t template) | |
670 | * | |
671 | * | |
672 | */ | |
673 | static void pscsi_free_device(void *p) | |
674 | { | |
675 | struct pscsi_dev_virt *pdv = p; | |
676 | struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; | |
677 | struct scsi_device *sd = pdv->pdv_sd; | |
678 | ||
679 | if (sd) { | |
680 | /* | |
681 | * Release exclusive pSCSI internal struct block_device claim for | |
682 | * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() | |
683 | */ | |
684 | if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { | |
685 | blkdev_put(pdv->pdv_bd, | |
686 | FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
687 | pdv->pdv_bd = NULL; | |
688 | } | |
689 | /* | |
690 | * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference | |
691 | * to struct Scsi_Host now. | |
692 | */ | |
693 | if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && | |
694 | (phv->phv_lld_host != NULL)) | |
695 | scsi_host_put(phv->phv_lld_host); | |
696 | ||
697 | if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) | |
698 | scsi_device_put(sd); | |
699 | ||
700 | pdv->pdv_sd = NULL; | |
701 | } | |
702 | ||
703 | kfree(pdv); | |
704 | } | |
705 | ||
706 | static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task) | |
707 | { | |
708 | return container_of(task, struct pscsi_plugin_task, pscsi_task); | |
709 | } | |
710 | ||
711 | ||
712 | /* pscsi_transport_complete(): | |
713 | * | |
714 | * | |
715 | */ | |
716 | static int pscsi_transport_complete(struct se_task *task) | |
717 | { | |
718 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
719 | struct scsi_device *sd = pdv->pdv_sd; | |
720 | int result; | |
721 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
722 | unsigned char *cdb = &pt->pscsi_cdb[0]; | |
723 | ||
724 | result = pt->pscsi_result; | |
725 | /* | |
726 | * Hack to make sure that Write-Protect modepage is set if R/O mode is | |
727 | * forced. | |
728 | */ | |
729 | if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && | |
730 | (status_byte(result) << 1) == SAM_STAT_GOOD) { | |
731 | if (!TASK_CMD(task)->se_deve) | |
732 | goto after_mode_sense; | |
733 | ||
734 | if (TASK_CMD(task)->se_deve->lun_flags & | |
735 | TRANSPORT_LUNFLAGS_READ_ONLY) { | |
736 | unsigned char *buf = (unsigned char *) | |
737 | T_TASK(task->task_se_cmd)->t_task_buf; | |
738 | ||
739 | if (cdb[0] == MODE_SENSE_10) { | |
740 | if (!(buf[3] & 0x80)) | |
741 | buf[3] |= 0x80; | |
742 | } else { | |
743 | if (!(buf[2] & 0x80)) | |
744 | buf[2] |= 0x80; | |
745 | } | |
746 | } | |
747 | } | |
748 | after_mode_sense: | |
749 | ||
750 | if (sd->type != TYPE_TAPE) | |
751 | goto after_mode_select; | |
752 | ||
753 | /* | |
754 | * Hack to correctly obtain the initiator requested blocksize for | |
755 | * TYPE_TAPE. Since this value is dependent upon each tape media, | |
756 | * struct scsi_device->sector_size will not contain the correct value | |
757 | * by default, so we go ahead and set it so | |
758 | * TRANSPORT(dev)->get_blockdev() returns the correct value to the | |
759 | * storage engine. | |
760 | */ | |
761 | if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && | |
762 | (status_byte(result) << 1) == SAM_STAT_GOOD) { | |
763 | unsigned char *buf; | |
764 | struct scatterlist *sg = task->task_sg; | |
765 | u16 bdl; | |
766 | u32 blocksize; | |
767 | ||
768 | buf = sg_virt(&sg[0]); | |
769 | if (!(buf)) { | |
770 | printk(KERN_ERR "Unable to get buf for scatterlist\n"); | |
771 | goto after_mode_select; | |
772 | } | |
773 | ||
774 | if (cdb[0] == MODE_SELECT) | |
775 | bdl = (buf[3]); | |
776 | else | |
777 | bdl = (buf[6] << 8) | (buf[7]); | |
778 | ||
779 | if (!bdl) | |
780 | goto after_mode_select; | |
781 | ||
782 | if (cdb[0] == MODE_SELECT) | |
783 | blocksize = (buf[9] << 16) | (buf[10] << 8) | | |
784 | (buf[11]); | |
785 | else | |
786 | blocksize = (buf[13] << 16) | (buf[14] << 8) | | |
787 | (buf[15]); | |
788 | ||
789 | sd->sector_size = blocksize; | |
790 | } | |
791 | after_mode_select: | |
792 | ||
793 | if (status_byte(result) & CHECK_CONDITION) | |
794 | return 1; | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
799 | static struct se_task * | |
800 | pscsi_alloc_task(struct se_cmd *cmd) | |
801 | { | |
802 | struct pscsi_plugin_task *pt; | |
803 | unsigned char *cdb = T_TASK(cmd)->t_task_cdb; | |
804 | ||
805 | pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL); | |
806 | if (!pt) { | |
807 | printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n"); | |
808 | return NULL; | |
809 | } | |
810 | ||
811 | /* | |
812 | * If TCM Core is signaling a > TCM_MAX_COMMAND_SIZE allocation, | |
813 | * allocate the extended CDB buffer for per struct se_task context | |
814 | * pt->pscsi_cdb now. | |
815 | */ | |
816 | if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) { | |
817 | ||
818 | pt->pscsi_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL); | |
819 | if (!(pt->pscsi_cdb)) { | |
820 | printk(KERN_ERR "pSCSI: Unable to allocate extended" | |
821 | " pt->pscsi_cdb\n"); | |
8fc1858a | 822 | kfree(pt); |
c66ac9db NB |
823 | return NULL; |
824 | } | |
825 | } else | |
826 | pt->pscsi_cdb = &pt->__pscsi_cdb[0]; | |
827 | ||
828 | return &pt->pscsi_task; | |
829 | } | |
830 | ||
831 | static inline void pscsi_blk_init_request( | |
832 | struct se_task *task, | |
833 | struct pscsi_plugin_task *pt, | |
834 | struct request *req, | |
835 | int bidi_read) | |
836 | { | |
837 | /* | |
838 | * Defined as "scsi command" in include/linux/blkdev.h. | |
839 | */ | |
840 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
841 | /* | |
842 | * For the extra BIDI-COMMAND READ struct request we do not | |
843 | * need to setup the remaining structure members | |
844 | */ | |
845 | if (bidi_read) | |
846 | return; | |
847 | /* | |
848 | * Setup the done function pointer for struct request, | |
849 | * also set the end_io_data pointer.to struct se_task. | |
850 | */ | |
851 | req->end_io = pscsi_req_done; | |
852 | req->end_io_data = (void *)task; | |
853 | /* | |
854 | * Load the referenced struct se_task's SCSI CDB into | |
855 | * include/linux/blkdev.h:struct request->cmd | |
856 | */ | |
857 | req->cmd_len = scsi_command_size(pt->pscsi_cdb); | |
858 | req->cmd = &pt->pscsi_cdb[0]; | |
859 | /* | |
860 | * Setup pointer for outgoing sense data. | |
861 | */ | |
862 | req->sense = (void *)&pt->pscsi_sense[0]; | |
863 | req->sense_len = 0; | |
864 | } | |
865 | ||
866 | /* | |
867 | * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB | |
868 | */ | |
869 | static int pscsi_blk_get_request(struct se_task *task) | |
870 | { | |
871 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
872 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
873 | ||
874 | pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue, | |
875 | (task->task_data_direction == DMA_TO_DEVICE), | |
876 | GFP_KERNEL); | |
877 | if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) { | |
878 | printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n", | |
879 | IS_ERR(pt->pscsi_req)); | |
880 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
881 | } | |
882 | /* | |
883 | * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, | |
884 | * and setup rq callback, CDB and sense. | |
885 | */ | |
886 | pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | /* pscsi_do_task(): (Part of se_subsystem_api_t template) | |
891 | * | |
892 | * | |
893 | */ | |
894 | static int pscsi_do_task(struct se_task *task) | |
895 | { | |
896 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
897 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
898 | /* | |
899 | * Set the struct request->timeout value based on peripheral | |
900 | * device type from SCSI. | |
901 | */ | |
902 | if (pdv->pdv_sd->type == TYPE_DISK) | |
903 | pt->pscsi_req->timeout = PS_TIMEOUT_DISK; | |
904 | else | |
905 | pt->pscsi_req->timeout = PS_TIMEOUT_OTHER; | |
906 | ||
907 | pt->pscsi_req->retries = PS_RETRY; | |
908 | /* | |
909 | * Queue the struct request into the struct scsi_device->request_queue. | |
910 | * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd | |
911 | * descriptor | |
912 | */ | |
913 | blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req, | |
914 | (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ), | |
915 | pscsi_req_done); | |
916 | ||
917 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
918 | } | |
919 | ||
920 | static void pscsi_free_task(struct se_task *task) | |
921 | { | |
922 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
923 | struct se_cmd *cmd = task->task_se_cmd; | |
924 | ||
925 | /* | |
926 | * Release the extended CDB allocation from pscsi_alloc_task() | |
927 | * if one exists. | |
928 | */ | |
929 | if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) | |
930 | kfree(pt->pscsi_cdb); | |
931 | /* | |
932 | * We do not release the bio(s) here associated with this task, as | |
933 | * this is handled by bio_put() and pscsi_bi_endio(). | |
934 | */ | |
935 | kfree(pt); | |
936 | } | |
937 | ||
938 | enum { | |
939 | Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, | |
940 | Opt_scsi_lun_id, Opt_err | |
941 | }; | |
942 | ||
943 | static match_table_t tokens = { | |
944 | {Opt_scsi_host_id, "scsi_host_id=%d"}, | |
945 | {Opt_scsi_channel_id, "scsi_channel_id=%d"}, | |
946 | {Opt_scsi_target_id, "scsi_target_id=%d"}, | |
947 | {Opt_scsi_lun_id, "scsi_lun_id=%d"}, | |
948 | {Opt_err, NULL} | |
949 | }; | |
950 | ||
951 | static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba, | |
952 | struct se_subsystem_dev *se_dev, | |
953 | const char *page, | |
954 | ssize_t count) | |
955 | { | |
956 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
957 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
958 | char *orig, *ptr, *opts; | |
959 | substring_t args[MAX_OPT_ARGS]; | |
960 | int ret = 0, arg, token; | |
961 | ||
962 | opts = kstrdup(page, GFP_KERNEL); | |
963 | if (!opts) | |
964 | return -ENOMEM; | |
965 | ||
966 | orig = opts; | |
967 | ||
968 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
969 | if (!*ptr) | |
970 | continue; | |
971 | ||
972 | token = match_token(ptr, tokens, args); | |
973 | switch (token) { | |
974 | case Opt_scsi_host_id: | |
975 | if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { | |
976 | printk(KERN_ERR "PSCSI[%d]: Unable to accept" | |
977 | " scsi_host_id while phv_mode ==" | |
978 | " PHV_LLD_SCSI_HOST_NO\n", | |
979 | phv->phv_host_id); | |
980 | ret = -EINVAL; | |
981 | goto out; | |
982 | } | |
983 | match_int(args, &arg); | |
984 | pdv->pdv_host_id = arg; | |
985 | printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:" | |
986 | " %d\n", phv->phv_host_id, pdv->pdv_host_id); | |
987 | pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; | |
988 | break; | |
989 | case Opt_scsi_channel_id: | |
990 | match_int(args, &arg); | |
991 | pdv->pdv_channel_id = arg; | |
992 | printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel" | |
993 | " ID: %d\n", phv->phv_host_id, | |
994 | pdv->pdv_channel_id); | |
995 | pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; | |
996 | break; | |
997 | case Opt_scsi_target_id: | |
998 | match_int(args, &arg); | |
999 | pdv->pdv_target_id = arg; | |
1000 | printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target" | |
1001 | " ID: %d\n", phv->phv_host_id, | |
1002 | pdv->pdv_target_id); | |
1003 | pdv->pdv_flags |= PDF_HAS_TARGET_ID; | |
1004 | break; | |
1005 | case Opt_scsi_lun_id: | |
1006 | match_int(args, &arg); | |
1007 | pdv->pdv_lun_id = arg; | |
1008 | printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:" | |
1009 | " %d\n", phv->phv_host_id, pdv->pdv_lun_id); | |
1010 | pdv->pdv_flags |= PDF_HAS_LUN_ID; | |
1011 | break; | |
1012 | default: | |
1013 | break; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | out: | |
1018 | kfree(orig); | |
1019 | return (!ret) ? count : ret; | |
1020 | } | |
1021 | ||
1022 | static ssize_t pscsi_check_configfs_dev_params( | |
1023 | struct se_hba *hba, | |
1024 | struct se_subsystem_dev *se_dev) | |
1025 | { | |
1026 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
1027 | ||
1028 | if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || | |
1029 | !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || | |
1030 | !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { | |
1031 | printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and" | |
1032 | " scsi_lun_id= parameters\n"); | |
1033 | return -1; | |
1034 | } | |
1035 | ||
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba, | |
1040 | struct se_subsystem_dev *se_dev, | |
1041 | char *b) | |
1042 | { | |
1043 | struct pscsi_hba_virt *phv = hba->hba_ptr; | |
1044 | struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; | |
1045 | struct scsi_device *sd = pdv->pdv_sd; | |
1046 | unsigned char host_id[16]; | |
1047 | ssize_t bl; | |
1048 | int i; | |
1049 | ||
1050 | if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) | |
1051 | snprintf(host_id, 16, "%d", pdv->pdv_host_id); | |
1052 | else | |
1053 | snprintf(host_id, 16, "PHBA Mode"); | |
1054 | ||
1055 | bl = sprintf(b, "SCSI Device Bus Location:" | |
1056 | " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", | |
1057 | pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, | |
1058 | host_id); | |
1059 | ||
1060 | if (sd) { | |
1061 | bl += sprintf(b + bl, " "); | |
1062 | bl += sprintf(b + bl, "Vendor: "); | |
1063 | for (i = 0; i < 8; i++) { | |
1064 | if (ISPRINT(sd->vendor[i])) /* printable character? */ | |
1065 | bl += sprintf(b + bl, "%c", sd->vendor[i]); | |
1066 | else | |
1067 | bl += sprintf(b + bl, " "); | |
1068 | } | |
1069 | bl += sprintf(b + bl, " Model: "); | |
1070 | for (i = 0; i < 16; i++) { | |
1071 | if (ISPRINT(sd->model[i])) /* printable character ? */ | |
1072 | bl += sprintf(b + bl, "%c", sd->model[i]); | |
1073 | else | |
1074 | bl += sprintf(b + bl, " "); | |
1075 | } | |
1076 | bl += sprintf(b + bl, " Rev: "); | |
1077 | for (i = 0; i < 4; i++) { | |
1078 | if (ISPRINT(sd->rev[i])) /* printable character ? */ | |
1079 | bl += sprintf(b + bl, "%c", sd->rev[i]); | |
1080 | else | |
1081 | bl += sprintf(b + bl, " "); | |
1082 | } | |
1083 | bl += sprintf(b + bl, "\n"); | |
1084 | } | |
1085 | return bl; | |
1086 | } | |
1087 | ||
1088 | static void pscsi_bi_endio(struct bio *bio, int error) | |
1089 | { | |
1090 | bio_put(bio); | |
1091 | } | |
1092 | ||
1093 | static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num) | |
1094 | { | |
1095 | struct bio *bio; | |
1096 | /* | |
1097 | * Use bio_malloc() following the comment in for bio -> struct request | |
1098 | * in block/blk-core.c:blk_make_request() | |
1099 | */ | |
1100 | bio = bio_kmalloc(GFP_KERNEL, sg_num); | |
1101 | if (!(bio)) { | |
1102 | printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n"); | |
1103 | return NULL; | |
1104 | } | |
1105 | bio->bi_end_io = pscsi_bi_endio; | |
1106 | ||
1107 | return bio; | |
1108 | } | |
1109 | ||
1110 | #if 0 | |
1111 | #define DEBUG_PSCSI(x...) printk(x) | |
1112 | #else | |
1113 | #define DEBUG_PSCSI(x...) | |
1114 | #endif | |
1115 | ||
1116 | static int __pscsi_map_task_SG( | |
1117 | struct se_task *task, | |
1118 | struct scatterlist *task_sg, | |
1119 | u32 task_sg_num, | |
1120 | int bidi_read) | |
1121 | { | |
1122 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1123 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
1124 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; | |
1125 | struct page *page; | |
1126 | struct scatterlist *sg; | |
1127 | u32 data_len = task->task_size, i, len, bytes, off; | |
1128 | int nr_pages = (task->task_size + task_sg[0].offset + | |
1129 | PAGE_SIZE - 1) >> PAGE_SHIFT; | |
1130 | int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; | |
1131 | int rw = (task->task_data_direction == DMA_TO_DEVICE); | |
1132 | ||
1133 | if (!task->task_size) | |
1134 | return 0; | |
1135 | /* | |
1136 | * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup | |
1137 | * the bio_vec maplist from TC< struct se_mem -> task->task_sg -> | |
1138 | * struct scatterlist memory. The struct se_task->task_sg[] currently needs | |
1139 | * to be attached to struct bios for submission to Linux/SCSI using | |
1140 | * struct request to struct scsi_device->request_queue. | |
1141 | * | |
1142 | * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI | |
1143 | * is ported to upstream SCSI passthrough functionality that accepts | |
1144 | * struct scatterlist->page_link or struct page as a paraemeter. | |
1145 | */ | |
1146 | DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages); | |
1147 | ||
1148 | for_each_sg(task_sg, sg, task_sg_num, i) { | |
1149 | page = sg_page(sg); | |
1150 | off = sg->offset; | |
1151 | len = sg->length; | |
1152 | ||
1153 | DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i, | |
1154 | page, len, off); | |
1155 | ||
1156 | while (len > 0 && data_len > 0) { | |
1157 | bytes = min_t(unsigned int, len, PAGE_SIZE - off); | |
1158 | bytes = min(bytes, data_len); | |
1159 | ||
1160 | if (!(bio)) { | |
1161 | nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); | |
1162 | nr_pages -= nr_vecs; | |
1163 | /* | |
1164 | * Calls bio_kmalloc() and sets bio->bi_end_io() | |
1165 | */ | |
1166 | bio = pscsi_get_bio(pdv, nr_vecs); | |
1167 | if (!(bio)) | |
1168 | goto fail; | |
1169 | ||
1170 | if (rw) | |
1171 | bio->bi_rw |= REQ_WRITE; | |
1172 | ||
1173 | DEBUG_PSCSI("PSCSI: Allocated bio: %p," | |
1174 | " dir: %s nr_vecs: %d\n", bio, | |
1175 | (rw) ? "rw" : "r", nr_vecs); | |
1176 | /* | |
1177 | * Set *hbio pointer to handle the case: | |
1178 | * nr_pages > BIO_MAX_PAGES, where additional | |
1179 | * bios need to be added to complete a given | |
1180 | * struct se_task | |
1181 | */ | |
1182 | if (!hbio) | |
1183 | hbio = tbio = bio; | |
1184 | else | |
1185 | tbio = tbio->bi_next = bio; | |
1186 | } | |
1187 | ||
1188 | DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d" | |
1189 | " bio: %p page: %p len: %d off: %d\n", i, bio, | |
1190 | page, len, off); | |
1191 | ||
1192 | rc = bio_add_pc_page(pdv->pdv_sd->request_queue, | |
1193 | bio, page, bytes, off); | |
1194 | if (rc != bytes) | |
1195 | goto fail; | |
1196 | ||
1197 | DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", | |
1198 | bio->bi_vcnt, nr_vecs); | |
1199 | ||
1200 | if (bio->bi_vcnt > nr_vecs) { | |
1201 | DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:" | |
1202 | " %d i: %d bio: %p, allocating another" | |
1203 | " bio\n", bio->bi_vcnt, i, bio); | |
1204 | /* | |
1205 | * Clear the pointer so that another bio will | |
1206 | * be allocated with pscsi_get_bio() above, the | |
1207 | * current bio has already been set *tbio and | |
1208 | * bio->bi_next. | |
1209 | */ | |
1210 | bio = NULL; | |
1211 | } | |
1212 | ||
1213 | page++; | |
1214 | len -= bytes; | |
1215 | data_len -= bytes; | |
1216 | off = 0; | |
1217 | } | |
1218 | } | |
1219 | /* | |
1220 | * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND | |
1221 | * primary SCSI WRITE poayload mapped for struct se_task->task_sg[] | |
1222 | */ | |
1223 | if (!(bidi_read)) { | |
1224 | /* | |
1225 | * Starting with v2.6.31, call blk_make_request() passing in *hbio to | |
1226 | * allocate the pSCSI task a struct request. | |
1227 | */ | |
1228 | pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue, | |
1229 | hbio, GFP_KERNEL); | |
1230 | if (!(pt->pscsi_req)) { | |
1231 | printk(KERN_ERR "pSCSI: blk_make_request() failed\n"); | |
1232 | goto fail; | |
1233 | } | |
1234 | /* | |
1235 | * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, | |
1236 | * and setup rq callback, CDB and sense. | |
1237 | */ | |
1238 | pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); | |
1239 | ||
1240 | return task->task_sg_num; | |
1241 | } | |
1242 | /* | |
1243 | * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND | |
1244 | * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[] | |
1245 | */ | |
1246 | pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue, | |
1247 | hbio, GFP_KERNEL); | |
1248 | if (!(pt->pscsi_req->next_rq)) { | |
1249 | printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n"); | |
1250 | goto fail; | |
1251 | } | |
1252 | pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1); | |
1253 | ||
1254 | return task->task_sg_num; | |
1255 | fail: | |
1256 | while (hbio) { | |
1257 | bio = hbio; | |
1258 | hbio = hbio->bi_next; | |
1259 | bio->bi_next = NULL; | |
1260 | bio_endio(bio, 0); | |
1261 | } | |
1262 | return ret; | |
1263 | } | |
1264 | ||
1265 | static int pscsi_map_task_SG(struct se_task *task) | |
1266 | { | |
1267 | int ret; | |
1268 | ||
1269 | /* | |
1270 | * Setup the main struct request for the task->task_sg[] payload | |
1271 | */ | |
1272 | ||
1273 | ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0); | |
1274 | if (ret >= 0 && task->task_sg_bidi) { | |
1275 | /* | |
1276 | * If present, set up the extra BIDI-COMMAND SCSI READ | |
1277 | * struct request and payload. | |
1278 | */ | |
1279 | ret = __pscsi_map_task_SG(task, task->task_sg_bidi, | |
1280 | task->task_sg_num, 1); | |
1281 | } | |
1282 | ||
1283 | if (ret < 0) | |
1284 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | /* pscsi_map_task_non_SG(): | |
1289 | * | |
1290 | * | |
1291 | */ | |
1292 | static int pscsi_map_task_non_SG(struct se_task *task) | |
1293 | { | |
1294 | struct se_cmd *cmd = TASK_CMD(task); | |
1295 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1296 | struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; | |
1297 | int ret = 0; | |
1298 | ||
1299 | if (pscsi_blk_get_request(task) < 0) | |
1300 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
1301 | ||
1302 | if (!task->task_size) | |
1303 | return 0; | |
1304 | ||
1305 | ret = blk_rq_map_kern(pdv->pdv_sd->request_queue, | |
1306 | pt->pscsi_req, T_TASK(cmd)->t_task_buf, | |
1307 | task->task_size, GFP_KERNEL); | |
1308 | if (ret < 0) { | |
1309 | printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret); | |
1310 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
1311 | } | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | static int pscsi_CDB_none(struct se_task *task) | |
1316 | { | |
1317 | return pscsi_blk_get_request(task); | |
1318 | } | |
1319 | ||
1320 | /* pscsi_get_cdb(): | |
1321 | * | |
1322 | * | |
1323 | */ | |
1324 | static unsigned char *pscsi_get_cdb(struct se_task *task) | |
1325 | { | |
1326 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1327 | ||
1328 | return pt->pscsi_cdb; | |
1329 | } | |
1330 | ||
1331 | /* pscsi_get_sense_buffer(): | |
1332 | * | |
1333 | * | |
1334 | */ | |
1335 | static unsigned char *pscsi_get_sense_buffer(struct se_task *task) | |
1336 | { | |
1337 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1338 | ||
1339 | return (unsigned char *)&pt->pscsi_sense[0]; | |
1340 | } | |
1341 | ||
1342 | /* pscsi_get_device_rev(): | |
1343 | * | |
1344 | * | |
1345 | */ | |
1346 | static u32 pscsi_get_device_rev(struct se_device *dev) | |
1347 | { | |
1348 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1349 | struct scsi_device *sd = pdv->pdv_sd; | |
1350 | ||
1351 | return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1; | |
1352 | } | |
1353 | ||
1354 | /* pscsi_get_device_type(): | |
1355 | * | |
1356 | * | |
1357 | */ | |
1358 | static u32 pscsi_get_device_type(struct se_device *dev) | |
1359 | { | |
1360 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1361 | struct scsi_device *sd = pdv->pdv_sd; | |
1362 | ||
1363 | return sd->type; | |
1364 | } | |
1365 | ||
1366 | static sector_t pscsi_get_blocks(struct se_device *dev) | |
1367 | { | |
1368 | struct pscsi_dev_virt *pdv = dev->dev_ptr; | |
1369 | ||
1370 | if (pdv->pdv_bd && pdv->pdv_bd->bd_part) | |
1371 | return pdv->pdv_bd->bd_part->nr_sects; | |
1372 | ||
1373 | dump_stack(); | |
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | /* pscsi_handle_SAM_STATUS_failures(): | |
1378 | * | |
1379 | * | |
1380 | */ | |
1381 | static inline void pscsi_process_SAM_status( | |
1382 | struct se_task *task, | |
1383 | struct pscsi_plugin_task *pt) | |
1384 | { | |
1385 | task->task_scsi_status = status_byte(pt->pscsi_result); | |
1386 | if ((task->task_scsi_status)) { | |
1387 | task->task_scsi_status <<= 1; | |
1388 | printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:" | |
1389 | " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], | |
1390 | pt->pscsi_result); | |
1391 | } | |
1392 | ||
1393 | switch (host_byte(pt->pscsi_result)) { | |
1394 | case DID_OK: | |
1395 | transport_complete_task(task, (!task->task_scsi_status)); | |
1396 | break; | |
1397 | default: | |
1398 | printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:" | |
1399 | " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], | |
1400 | pt->pscsi_result); | |
1401 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
1402 | task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
1403 | TASK_CMD(task)->transport_error_status = | |
1404 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
1405 | transport_complete_task(task, 0); | |
1406 | break; | |
1407 | } | |
1408 | ||
1409 | return; | |
1410 | } | |
1411 | ||
1412 | static void pscsi_req_done(struct request *req, int uptodate) | |
1413 | { | |
1414 | struct se_task *task = req->end_io_data; | |
1415 | struct pscsi_plugin_task *pt = PSCSI_TASK(task); | |
1416 | ||
1417 | pt->pscsi_result = req->errors; | |
1418 | pt->pscsi_resid = req->resid_len; | |
1419 | ||
1420 | pscsi_process_SAM_status(task, pt); | |
1421 | /* | |
1422 | * Release BIDI-READ if present | |
1423 | */ | |
1424 | if (req->next_rq != NULL) | |
1425 | __blk_put_request(req->q, req->next_rq); | |
1426 | ||
1427 | __blk_put_request(req->q, req); | |
1428 | pt->pscsi_req = NULL; | |
1429 | } | |
1430 | ||
1431 | static struct se_subsystem_api pscsi_template = { | |
1432 | .name = "pscsi", | |
1433 | .owner = THIS_MODULE, | |
1434 | .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, | |
1435 | .cdb_none = pscsi_CDB_none, | |
1436 | .map_task_non_SG = pscsi_map_task_non_SG, | |
1437 | .map_task_SG = pscsi_map_task_SG, | |
1438 | .attach_hba = pscsi_attach_hba, | |
1439 | .detach_hba = pscsi_detach_hba, | |
1440 | .pmode_enable_hba = pscsi_pmode_enable_hba, | |
1441 | .allocate_virtdevice = pscsi_allocate_virtdevice, | |
1442 | .create_virtdevice = pscsi_create_virtdevice, | |
1443 | .free_device = pscsi_free_device, | |
1444 | .transport_complete = pscsi_transport_complete, | |
1445 | .alloc_task = pscsi_alloc_task, | |
1446 | .do_task = pscsi_do_task, | |
1447 | .free_task = pscsi_free_task, | |
1448 | .check_configfs_dev_params = pscsi_check_configfs_dev_params, | |
1449 | .set_configfs_dev_params = pscsi_set_configfs_dev_params, | |
1450 | .show_configfs_dev_params = pscsi_show_configfs_dev_params, | |
1451 | .get_cdb = pscsi_get_cdb, | |
1452 | .get_sense_buffer = pscsi_get_sense_buffer, | |
1453 | .get_device_rev = pscsi_get_device_rev, | |
1454 | .get_device_type = pscsi_get_device_type, | |
1455 | .get_blocks = pscsi_get_blocks, | |
1456 | }; | |
1457 | ||
1458 | static int __init pscsi_module_init(void) | |
1459 | { | |
1460 | return transport_subsystem_register(&pscsi_template); | |
1461 | } | |
1462 | ||
1463 | static void pscsi_module_exit(void) | |
1464 | { | |
1465 | transport_subsystem_release(&pscsi_template); | |
1466 | } | |
1467 | ||
1468 | MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); | |
1469 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
1470 | MODULE_LICENSE("GPL"); | |
1471 | ||
1472 | module_init(pscsi_module_init); | |
1473 | module_exit(pscsi_module_exit); |