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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
bloba4489444ffbc640d940869ca7de305b2ae6c4b58
1 /*
2 * SCSI Block Commands (SBC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/ratelimit.h>
26 #include <linux/crc-t10dif.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_tcq.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34
35 #include "target_core_internal.h"
36 #include "target_core_ua.h"
37 #include "target_core_alua.h"
38
39 static sense_reason_t
40 sbc_emulate_readcapacity(struct se_cmd *cmd)
41 {
42 struct se_device *dev = cmd->se_dev;
43 unsigned char *cdb = cmd->t_task_cdb;
44 unsigned long long blocks_long = dev->transport->get_blocks(dev);
45 unsigned char *rbuf;
46 unsigned char buf[8];
47 u32 blocks;
48
49 /*
50 * SBC-2 says:
51 * If the PMI bit is set to zero and the LOGICAL BLOCK
52 * ADDRESS field is not set to zero, the device server shall
53 * terminate the command with CHECK CONDITION status with
54 * the sense key set to ILLEGAL REQUEST and the additional
55 * sense code set to INVALID FIELD IN CDB.
56 *
57 * In SBC-3, these fields are obsolete, but some SCSI
58 * compliance tests actually check this, so we might as well
59 * follow SBC-2.
60 */
61 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
62 return TCM_INVALID_CDB_FIELD;
63
64 if (blocks_long >= 0x00000000ffffffff)
65 blocks = 0xffffffff;
66 else
67 blocks = (u32)blocks_long;
68
69 buf[0] = (blocks >> 24) & 0xff;
70 buf[1] = (blocks >> 16) & 0xff;
71 buf[2] = (blocks >> 8) & 0xff;
72 buf[3] = blocks & 0xff;
73 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
74 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
75 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
76 buf[7] = dev->dev_attrib.block_size & 0xff;
77
78 rbuf = transport_kmap_data_sg(cmd);
79 if (rbuf) {
80 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
81 transport_kunmap_data_sg(cmd);
82 }
83
84 target_complete_cmd(cmd, GOOD);
85 return 0;
86 }
87
88 static sense_reason_t
89 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
90 {
91 struct se_device *dev = cmd->se_dev;
92 unsigned char *rbuf;
93 unsigned char buf[32];
94 unsigned long long blocks = dev->transport->get_blocks(dev);
95
96 memset(buf, 0, sizeof(buf));
97 buf[0] = (blocks >> 56) & 0xff;
98 buf[1] = (blocks >> 48) & 0xff;
99 buf[2] = (blocks >> 40) & 0xff;
100 buf[3] = (blocks >> 32) & 0xff;
101 buf[4] = (blocks >> 24) & 0xff;
102 buf[5] = (blocks >> 16) & 0xff;
103 buf[6] = (blocks >> 8) & 0xff;
104 buf[7] = blocks & 0xff;
105 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
106 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
107 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
108 buf[11] = dev->dev_attrib.block_size & 0xff;
109 /*
110 * Set P_TYPE and PROT_EN bits for DIF support
111 */
112 if (dev->dev_attrib.pi_prot_type)
113 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
114
115 if (dev->transport->get_lbppbe)
116 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
117
118 if (dev->transport->get_alignment_offset_lbas) {
119 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
120 buf[14] = (lalba >> 8) & 0x3f;
121 buf[15] = lalba & 0xff;
122 }
123
124 /*
125 * Set Thin Provisioning Enable bit following sbc3r22 in section
126 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
127 */
128 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
129 buf[14] |= 0x80;
130
131 rbuf = transport_kmap_data_sg(cmd);
132 if (rbuf) {
133 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
134 transport_kunmap_data_sg(cmd);
135 }
136
137 target_complete_cmd(cmd, GOOD);
138 return 0;
139 }
140
141 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
142 {
143 u32 num_blocks;
144
145 if (cmd->t_task_cdb[0] == WRITE_SAME)
146 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
147 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
148 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
149 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
150 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
151
152 /*
153 * Use the explicit range when non zero is supplied, otherwise calculate
154 * the remaining range based on ->get_blocks() - starting LBA.
155 */
156 if (num_blocks)
157 return num_blocks;
158
159 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
160 cmd->t_task_lba + 1;
161 }
162 EXPORT_SYMBOL(sbc_get_write_same_sectors);
163
164 static sense_reason_t
165 sbc_emulate_noop(struct se_cmd *cmd)
166 {
167 target_complete_cmd(cmd, GOOD);
168 return 0;
169 }
170
171 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
172 {
173 return cmd->se_dev->dev_attrib.block_size * sectors;
174 }
175
176 static int sbc_check_valid_sectors(struct se_cmd *cmd)
177 {
178 struct se_device *dev = cmd->se_dev;
179 unsigned long long end_lba;
180 u32 sectors;
181
182 sectors = cmd->data_length / dev->dev_attrib.block_size;
183 end_lba = dev->transport->get_blocks(dev) + 1;
184
185 if (cmd->t_task_lba + sectors > end_lba) {
186 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
187 cmd->t_task_lba, sectors, end_lba);
188 return -EINVAL;
189 }
190
191 return 0;
192 }
193
194 static inline u32 transport_get_sectors_6(unsigned char *cdb)
195 {
196 /*
197 * Use 8-bit sector value. SBC-3 says:
198 *
199 * A TRANSFER LENGTH field set to zero specifies that 256
200 * logical blocks shall be written. Any other value
201 * specifies the number of logical blocks that shall be
202 * written.
203 */
204 return cdb[4] ? : 256;
205 }
206
207 static inline u32 transport_get_sectors_10(unsigned char *cdb)
208 {
209 return (u32)(cdb[7] << 8) + cdb[8];
210 }
211
212 static inline u32 transport_get_sectors_12(unsigned char *cdb)
213 {
214 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
215 }
216
217 static inline u32 transport_get_sectors_16(unsigned char *cdb)
218 {
219 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
220 (cdb[12] << 8) + cdb[13];
221 }
222
223 /*
224 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
225 */
226 static inline u32 transport_get_sectors_32(unsigned char *cdb)
227 {
228 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
229 (cdb[30] << 8) + cdb[31];
230
231 }
232
233 static inline u32 transport_lba_21(unsigned char *cdb)
234 {
235 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
236 }
237
238 static inline u32 transport_lba_32(unsigned char *cdb)
239 {
240 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
241 }
242
243 static inline unsigned long long transport_lba_64(unsigned char *cdb)
244 {
245 unsigned int __v1, __v2;
246
247 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
248 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
249
250 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
251 }
252
253 /*
254 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
255 */
256 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
257 {
258 unsigned int __v1, __v2;
259
260 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
261 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
262
263 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
264 }
265
266 static sense_reason_t
267 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
268 {
269 unsigned int sectors = sbc_get_write_same_sectors(cmd);
270
271 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
272 pr_err("WRITE_SAME PBDATA and LBDATA"
273 " bits not supported for Block Discard"
274 " Emulation\n");
275 return TCM_UNSUPPORTED_SCSI_OPCODE;
276 }
277 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
278 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
279 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
280 return TCM_INVALID_CDB_FIELD;
281 }
282 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
283 if (flags[0] & 0x10) {
284 pr_warn("WRITE SAME with ANCHOR not supported\n");
285 return TCM_INVALID_CDB_FIELD;
286 }
287 /*
288 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
289 * translated into block discard requests within backend code.
290 */
291 if (flags[0] & 0x08) {
292 if (!ops->execute_write_same_unmap)
293 return TCM_UNSUPPORTED_SCSI_OPCODE;
294
295 cmd->execute_cmd = ops->execute_write_same_unmap;
296 return 0;
297 }
298 if (!ops->execute_write_same)
299 return TCM_UNSUPPORTED_SCSI_OPCODE;
300
301 cmd->execute_cmd = ops->execute_write_same;
302 return 0;
303 }
304
305 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
306 {
307 unsigned char *buf, *addr;
308 struct scatterlist *sg;
309 unsigned int offset;
310 sense_reason_t ret = TCM_NO_SENSE;
311 int i, count;
312 /*
313 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
314 *
315 * 1) read the specified logical block(s);
316 * 2) transfer logical blocks from the data-out buffer;
317 * 3) XOR the logical blocks transferred from the data-out buffer with
318 * the logical blocks read, storing the resulting XOR data in a buffer;
319 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
320 * blocks transferred from the data-out buffer; and
321 * 5) transfer the resulting XOR data to the data-in buffer.
322 */
323 buf = kmalloc(cmd->data_length, GFP_KERNEL);
324 if (!buf) {
325 pr_err("Unable to allocate xor_callback buf\n");
326 return TCM_OUT_OF_RESOURCES;
327 }
328 /*
329 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
330 * into the locally allocated *buf
331 */
332 sg_copy_to_buffer(cmd->t_data_sg,
333 cmd->t_data_nents,
334 buf,
335 cmd->data_length);
336
337 /*
338 * Now perform the XOR against the BIDI read memory located at
339 * cmd->t_mem_bidi_list
340 */
341
342 offset = 0;
343 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
344 addr = kmap_atomic(sg_page(sg));
345 if (!addr) {
346 ret = TCM_OUT_OF_RESOURCES;
347 goto out;
348 }
349
350 for (i = 0; i < sg->length; i++)
351 *(addr + sg->offset + i) ^= *(buf + offset + i);
352
353 offset += sg->length;
354 kunmap_atomic(addr);
355 }
356
357 out:
358 kfree(buf);
359 return ret;
360 }
361
362 static sense_reason_t
363 sbc_execute_rw(struct se_cmd *cmd)
364 {
365 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
366 cmd->data_direction);
367 }
368
369 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
370 {
371 struct se_device *dev = cmd->se_dev;
372
373 /*
374 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
375 * within target_complete_ok_work() if the command was successfully
376 * sent to the backend driver.
377 */
378 spin_lock_irq(&cmd->t_state_lock);
379 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
380 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
381 spin_unlock_irq(&cmd->t_state_lock);
382
383 /*
384 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
385 * before the original READ I/O submission.
386 */
387 up(&dev->caw_sem);
388
389 return TCM_NO_SENSE;
390 }
391
392 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
393 {
394 struct se_device *dev = cmd->se_dev;
395 struct scatterlist *write_sg = NULL, *sg;
396 unsigned char *buf = NULL, *addr;
397 struct sg_mapping_iter m;
398 unsigned int offset = 0, len;
399 unsigned int nlbas = cmd->t_task_nolb;
400 unsigned int block_size = dev->dev_attrib.block_size;
401 unsigned int compare_len = (nlbas * block_size);
402 sense_reason_t ret = TCM_NO_SENSE;
403 int rc, i;
404
405 /*
406 * Handle early failure in transport_generic_request_failure(),
407 * which will not have taken ->caw_mutex yet..
408 */
409 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
410 return TCM_NO_SENSE;
411 /*
412 * Immediately exit + release dev->caw_sem if command has already
413 * been failed with a non-zero SCSI status.
414 */
415 if (cmd->scsi_status) {
416 pr_err("compare_and_write_callback: non zero scsi_status:"
417 " 0x%02x\n", cmd->scsi_status);
418 goto out;
419 }
420
421 buf = kzalloc(cmd->data_length, GFP_KERNEL);
422 if (!buf) {
423 pr_err("Unable to allocate compare_and_write buf\n");
424 ret = TCM_OUT_OF_RESOURCES;
425 goto out;
426 }
427
428 write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
429 GFP_KERNEL);
430 if (!write_sg) {
431 pr_err("Unable to allocate compare_and_write sg\n");
432 ret = TCM_OUT_OF_RESOURCES;
433 goto out;
434 }
435 /*
436 * Setup verify and write data payloads from total NumberLBAs.
437 */
438 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
439 cmd->data_length);
440 if (!rc) {
441 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
442 ret = TCM_OUT_OF_RESOURCES;
443 goto out;
444 }
445 /*
446 * Compare against SCSI READ payload against verify payload
447 */
448 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
449 addr = (unsigned char *)kmap_atomic(sg_page(sg));
450 if (!addr) {
451 ret = TCM_OUT_OF_RESOURCES;
452 goto out;
453 }
454
455 len = min(sg->length, compare_len);
456
457 if (memcmp(addr, buf + offset, len)) {
458 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
459 addr, buf + offset);
460 kunmap_atomic(addr);
461 goto miscompare;
462 }
463 kunmap_atomic(addr);
464
465 offset += len;
466 compare_len -= len;
467 if (!compare_len)
468 break;
469 }
470
471 i = 0;
472 len = cmd->t_task_nolb * block_size;
473 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
474 /*
475 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
476 */
477 while (len) {
478 sg_miter_next(&m);
479
480 if (block_size < PAGE_SIZE) {
481 sg_set_page(&write_sg[i], m.page, block_size,
482 block_size);
483 } else {
484 sg_miter_next(&m);
485 sg_set_page(&write_sg[i], m.page, block_size,
486 0);
487 }
488 len -= block_size;
489 i++;
490 }
491 sg_miter_stop(&m);
492 /*
493 * Save the original SGL + nents values before updating to new
494 * assignments, to be released in transport_free_pages() ->
495 * transport_reset_sgl_orig()
496 */
497 cmd->t_data_sg_orig = cmd->t_data_sg;
498 cmd->t_data_sg = write_sg;
499 cmd->t_data_nents_orig = cmd->t_data_nents;
500 cmd->t_data_nents = 1;
501
502 cmd->sam_task_attr = MSG_HEAD_TAG;
503 cmd->transport_complete_callback = compare_and_write_post;
504 /*
505 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
506 * for submitting the adjusted SGL to write instance user-data.
507 */
508 cmd->execute_cmd = sbc_execute_rw;
509
510 spin_lock_irq(&cmd->t_state_lock);
511 cmd->t_state = TRANSPORT_PROCESSING;
512 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
513 spin_unlock_irq(&cmd->t_state_lock);
514
515 __target_execute_cmd(cmd);
516
517 kfree(buf);
518 return ret;
519
520 miscompare:
521 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
522 dev->transport->name);
523 ret = TCM_MISCOMPARE_VERIFY;
524 out:
525 /*
526 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
527 * sbc_compare_and_write() before the original READ I/O submission.
528 */
529 up(&dev->caw_sem);
530 kfree(write_sg);
531 kfree(buf);
532 return ret;
533 }
534
535 static sense_reason_t
536 sbc_compare_and_write(struct se_cmd *cmd)
537 {
538 struct se_device *dev = cmd->se_dev;
539 sense_reason_t ret;
540 int rc;
541 /*
542 * Submit the READ first for COMPARE_AND_WRITE to perform the
543 * comparision using SGLs at cmd->t_bidi_data_sg..
544 */
545 rc = down_interruptible(&dev->caw_sem);
546 if ((rc != 0) || signal_pending(current)) {
547 cmd->transport_complete_callback = NULL;
548 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
549 }
550 /*
551 * Reset cmd->data_length to individual block_size in order to not
552 * confuse backend drivers that depend on this value matching the
553 * size of the I/O being submitted.
554 */
555 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
556
557 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
558 DMA_FROM_DEVICE);
559 if (ret) {
560 cmd->transport_complete_callback = NULL;
561 up(&dev->caw_sem);
562 return ret;
563 }
564 /*
565 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
566 * upon MISCOMPARE, or in compare_and_write_done() upon completion
567 * of WRITE instance user-data.
568 */
569 return TCM_NO_SENSE;
570 }
571
572 static bool
573 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
574 u32 sectors)
575 {
576 if (!cmd->t_prot_sg || !cmd->t_prot_nents)
577 return true;
578
579 switch (dev->dev_attrib.pi_prot_type) {
580 case TARGET_DIF_TYPE3_PROT:
581 if (!(cdb[1] & 0xe0))
582 return true;
583
584 cmd->reftag_seed = 0xffffffff;
585 break;
586 case TARGET_DIF_TYPE2_PROT:
587 if (cdb[1] & 0xe0)
588 return false;
589
590 cmd->reftag_seed = cmd->t_task_lba;
591 break;
592 case TARGET_DIF_TYPE1_PROT:
593 if (!(cdb[1] & 0xe0))
594 return true;
595
596 cmd->reftag_seed = cmd->t_task_lba;
597 break;
598 case TARGET_DIF_TYPE0_PROT:
599 default:
600 return true;
601 }
602
603 cmd->prot_type = dev->dev_attrib.pi_prot_type;
604 cmd->prot_length = dev->prot_length * sectors;
605 cmd->prot_handover = PROT_SEPERATED;
606
607 return true;
608 }
609
610 sense_reason_t
611 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
612 {
613 struct se_device *dev = cmd->se_dev;
614 unsigned char *cdb = cmd->t_task_cdb;
615 unsigned int size;
616 u32 sectors = 0;
617 sense_reason_t ret;
618
619 switch (cdb[0]) {
620 case READ_6:
621 sectors = transport_get_sectors_6(cdb);
622 cmd->t_task_lba = transport_lba_21(cdb);
623 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
624 cmd->execute_rw = ops->execute_rw;
625 cmd->execute_cmd = sbc_execute_rw;
626 break;
627 case READ_10:
628 sectors = transport_get_sectors_10(cdb);
629 cmd->t_task_lba = transport_lba_32(cdb);
630
631 if (!sbc_check_prot(dev, cmd, cdb, sectors))
632 return TCM_UNSUPPORTED_SCSI_OPCODE;
633
634 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
635 cmd->execute_rw = ops->execute_rw;
636 cmd->execute_cmd = sbc_execute_rw;
637 break;
638 case READ_12:
639 sectors = transport_get_sectors_12(cdb);
640 cmd->t_task_lba = transport_lba_32(cdb);
641
642 if (!sbc_check_prot(dev, cmd, cdb, sectors))
643 return TCM_UNSUPPORTED_SCSI_OPCODE;
644
645 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
646 cmd->execute_rw = ops->execute_rw;
647 cmd->execute_cmd = sbc_execute_rw;
648 break;
649 case READ_16:
650 sectors = transport_get_sectors_16(cdb);
651 cmd->t_task_lba = transport_lba_64(cdb);
652
653 if (!sbc_check_prot(dev, cmd, cdb, sectors))
654 return TCM_UNSUPPORTED_SCSI_OPCODE;
655
656 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
657 cmd->execute_rw = ops->execute_rw;
658 cmd->execute_cmd = sbc_execute_rw;
659 break;
660 case WRITE_6:
661 sectors = transport_get_sectors_6(cdb);
662 cmd->t_task_lba = transport_lba_21(cdb);
663 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
664 cmd->execute_rw = ops->execute_rw;
665 cmd->execute_cmd = sbc_execute_rw;
666 break;
667 case WRITE_10:
668 case WRITE_VERIFY:
669 sectors = transport_get_sectors_10(cdb);
670 cmd->t_task_lba = transport_lba_32(cdb);
671
672 if (!sbc_check_prot(dev, cmd, cdb, sectors))
673 return TCM_UNSUPPORTED_SCSI_OPCODE;
674
675 if (cdb[1] & 0x8)
676 cmd->se_cmd_flags |= SCF_FUA;
677 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
678 cmd->execute_rw = ops->execute_rw;
679 cmd->execute_cmd = sbc_execute_rw;
680 break;
681 case WRITE_12:
682 sectors = transport_get_sectors_12(cdb);
683 cmd->t_task_lba = transport_lba_32(cdb);
684
685 if (!sbc_check_prot(dev, cmd, cdb, sectors))
686 return TCM_UNSUPPORTED_SCSI_OPCODE;
687
688 if (cdb[1] & 0x8)
689 cmd->se_cmd_flags |= SCF_FUA;
690 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
691 cmd->execute_rw = ops->execute_rw;
692 cmd->execute_cmd = sbc_execute_rw;
693 break;
694 case WRITE_16:
695 sectors = transport_get_sectors_16(cdb);
696 cmd->t_task_lba = transport_lba_64(cdb);
697
698 if (!sbc_check_prot(dev, cmd, cdb, sectors))
699 return TCM_UNSUPPORTED_SCSI_OPCODE;
700
701 if (cdb[1] & 0x8)
702 cmd->se_cmd_flags |= SCF_FUA;
703 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
704 cmd->execute_rw = ops->execute_rw;
705 cmd->execute_cmd = sbc_execute_rw;
706 break;
707 case XDWRITEREAD_10:
708 if (cmd->data_direction != DMA_TO_DEVICE ||
709 !(cmd->se_cmd_flags & SCF_BIDI))
710 return TCM_INVALID_CDB_FIELD;
711 sectors = transport_get_sectors_10(cdb);
712
713 cmd->t_task_lba = transport_lba_32(cdb);
714 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
715
716 /*
717 * Setup BIDI XOR callback to be run after I/O completion.
718 */
719 cmd->execute_rw = ops->execute_rw;
720 cmd->execute_cmd = sbc_execute_rw;
721 cmd->transport_complete_callback = &xdreadwrite_callback;
722 if (cdb[1] & 0x8)
723 cmd->se_cmd_flags |= SCF_FUA;
724 break;
725 case VARIABLE_LENGTH_CMD:
726 {
727 u16 service_action = get_unaligned_be16(&cdb[8]);
728 switch (service_action) {
729 case XDWRITEREAD_32:
730 sectors = transport_get_sectors_32(cdb);
731
732 /*
733 * Use WRITE_32 and READ_32 opcodes for the emulated
734 * XDWRITE_READ_32 logic.
735 */
736 cmd->t_task_lba = transport_lba_64_ext(cdb);
737 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
738
739 /*
740 * Setup BIDI XOR callback to be run during after I/O
741 * completion.
742 */
743 cmd->execute_rw = ops->execute_rw;
744 cmd->execute_cmd = sbc_execute_rw;
745 cmd->transport_complete_callback = &xdreadwrite_callback;
746 if (cdb[1] & 0x8)
747 cmd->se_cmd_flags |= SCF_FUA;
748 break;
749 case WRITE_SAME_32:
750 sectors = transport_get_sectors_32(cdb);
751 if (!sectors) {
752 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
753 " supported\n");
754 return TCM_INVALID_CDB_FIELD;
755 }
756
757 size = sbc_get_size(cmd, 1);
758 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
759
760 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
761 if (ret)
762 return ret;
763 break;
764 default:
765 pr_err("VARIABLE_LENGTH_CMD service action"
766 " 0x%04x not supported\n", service_action);
767 return TCM_UNSUPPORTED_SCSI_OPCODE;
768 }
769 break;
770 }
771 case COMPARE_AND_WRITE:
772 sectors = cdb[13];
773 /*
774 * Currently enforce COMPARE_AND_WRITE for a single sector
775 */
776 if (sectors > 1) {
777 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
778 " than 1\n", sectors);
779 return TCM_INVALID_CDB_FIELD;
780 }
781 /*
782 * Double size because we have two buffers, note that
783 * zero is not an error..
784 */
785 size = 2 * sbc_get_size(cmd, sectors);
786 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
787 cmd->t_task_nolb = sectors;
788 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
789 cmd->execute_rw = ops->execute_rw;
790 cmd->execute_cmd = sbc_compare_and_write;
791 cmd->transport_complete_callback = compare_and_write_callback;
792 break;
793 case READ_CAPACITY:
794 size = READ_CAP_LEN;
795 cmd->execute_cmd = sbc_emulate_readcapacity;
796 break;
797 case SERVICE_ACTION_IN:
798 switch (cmd->t_task_cdb[1] & 0x1f) {
799 case SAI_READ_CAPACITY_16:
800 cmd->execute_cmd = sbc_emulate_readcapacity_16;
801 break;
802 case SAI_REPORT_REFERRALS:
803 cmd->execute_cmd = target_emulate_report_referrals;
804 break;
805 default:
806 pr_err("Unsupported SA: 0x%02x\n",
807 cmd->t_task_cdb[1] & 0x1f);
808 return TCM_INVALID_CDB_FIELD;
809 }
810 size = (cdb[10] << 24) | (cdb[11] << 16) |
811 (cdb[12] << 8) | cdb[13];
812 break;
813 case SYNCHRONIZE_CACHE:
814 case SYNCHRONIZE_CACHE_16:
815 if (!ops->execute_sync_cache) {
816 size = 0;
817 cmd->execute_cmd = sbc_emulate_noop;
818 break;
819 }
820
821 /*
822 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
823 */
824 if (cdb[0] == SYNCHRONIZE_CACHE) {
825 sectors = transport_get_sectors_10(cdb);
826 cmd->t_task_lba = transport_lba_32(cdb);
827 } else {
828 sectors = transport_get_sectors_16(cdb);
829 cmd->t_task_lba = transport_lba_64(cdb);
830 }
831
832 size = sbc_get_size(cmd, sectors);
833
834 /*
835 * Check to ensure that LBA + Range does not exceed past end of
836 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
837 */
838 if (cmd->t_task_lba || sectors) {
839 if (sbc_check_valid_sectors(cmd) < 0)
840 return TCM_ADDRESS_OUT_OF_RANGE;
841 }
842 cmd->execute_cmd = ops->execute_sync_cache;
843 break;
844 case UNMAP:
845 if (!ops->execute_unmap)
846 return TCM_UNSUPPORTED_SCSI_OPCODE;
847
848 size = get_unaligned_be16(&cdb[7]);
849 cmd->execute_cmd = ops->execute_unmap;
850 break;
851 case WRITE_SAME_16:
852 sectors = transport_get_sectors_16(cdb);
853 if (!sectors) {
854 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
855 return TCM_INVALID_CDB_FIELD;
856 }
857
858 size = sbc_get_size(cmd, 1);
859 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
860
861 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
862 if (ret)
863 return ret;
864 break;
865 case WRITE_SAME:
866 sectors = transport_get_sectors_10(cdb);
867 if (!sectors) {
868 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
869 return TCM_INVALID_CDB_FIELD;
870 }
871
872 size = sbc_get_size(cmd, 1);
873 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
874
875 /*
876 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
877 * of byte 1 bit 3 UNMAP instead of original reserved field
878 */
879 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
880 if (ret)
881 return ret;
882 break;
883 case VERIFY:
884 size = 0;
885 cmd->execute_cmd = sbc_emulate_noop;
886 break;
887 case REZERO_UNIT:
888 case SEEK_6:
889 case SEEK_10:
890 /*
891 * There are still clients out there which use these old SCSI-2
892 * commands. This mainly happens when running VMs with legacy
893 * guest systems, connected via SCSI command pass-through to
894 * iSCSI targets. Make them happy and return status GOOD.
895 */
896 size = 0;
897 cmd->execute_cmd = sbc_emulate_noop;
898 break;
899 default:
900 ret = spc_parse_cdb(cmd, &size);
901 if (ret)
902 return ret;
903 }
904
905 /* reject any command that we don't have a handler for */
906 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
907 return TCM_UNSUPPORTED_SCSI_OPCODE;
908
909 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
910 unsigned long long end_lba;
911
912 if (sectors > dev->dev_attrib.fabric_max_sectors) {
913 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
914 " big sectors %u exceeds fabric_max_sectors:"
915 " %u\n", cdb[0], sectors,
916 dev->dev_attrib.fabric_max_sectors);
917 return TCM_INVALID_CDB_FIELD;
918 }
919 if (sectors > dev->dev_attrib.hw_max_sectors) {
920 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
921 " big sectors %u exceeds backend hw_max_sectors:"
922 " %u\n", cdb[0], sectors,
923 dev->dev_attrib.hw_max_sectors);
924 return TCM_INVALID_CDB_FIELD;
925 }
926
927 end_lba = dev->transport->get_blocks(dev) + 1;
928 if (cmd->t_task_lba + sectors > end_lba) {
929 pr_err("cmd exceeds last lba %llu "
930 "(lba %llu, sectors %u)\n",
931 end_lba, cmd->t_task_lba, sectors);
932 return TCM_ADDRESS_OUT_OF_RANGE;
933 }
934
935 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
936 size = sbc_get_size(cmd, sectors);
937 }
938
939 return target_cmd_size_check(cmd, size);
940 }
941 EXPORT_SYMBOL(sbc_parse_cdb);
942
943 u32 sbc_get_device_type(struct se_device *dev)
944 {
945 return TYPE_DISK;
946 }
947 EXPORT_SYMBOL(sbc_get_device_type);
948
949 sense_reason_t
950 sbc_execute_unmap(struct se_cmd *cmd,
951 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
952 sector_t, sector_t),
953 void *priv)
954 {
955 struct se_device *dev = cmd->se_dev;
956 unsigned char *buf, *ptr = NULL;
957 sector_t lba;
958 int size;
959 u32 range;
960 sense_reason_t ret = 0;
961 int dl, bd_dl;
962
963 /* We never set ANC_SUP */
964 if (cmd->t_task_cdb[1])
965 return TCM_INVALID_CDB_FIELD;
966
967 if (cmd->data_length == 0) {
968 target_complete_cmd(cmd, SAM_STAT_GOOD);
969 return 0;
970 }
971
972 if (cmd->data_length < 8) {
973 pr_warn("UNMAP parameter list length %u too small\n",
974 cmd->data_length);
975 return TCM_PARAMETER_LIST_LENGTH_ERROR;
976 }
977
978 buf = transport_kmap_data_sg(cmd);
979 if (!buf)
980 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
981
982 dl = get_unaligned_be16(&buf[0]);
983 bd_dl = get_unaligned_be16(&buf[2]);
984
985 size = cmd->data_length - 8;
986 if (bd_dl > size)
987 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
988 cmd->data_length, bd_dl);
989 else
990 size = bd_dl;
991
992 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
993 ret = TCM_INVALID_PARAMETER_LIST;
994 goto err;
995 }
996
997 /* First UNMAP block descriptor starts at 8 byte offset */
998 ptr = &buf[8];
999 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1000 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1001
1002 while (size >= 16) {
1003 lba = get_unaligned_be64(&ptr[0]);
1004 range = get_unaligned_be32(&ptr[8]);
1005 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1006 (unsigned long long)lba, range);
1007
1008 if (range > dev->dev_attrib.max_unmap_lba_count) {
1009 ret = TCM_INVALID_PARAMETER_LIST;
1010 goto err;
1011 }
1012
1013 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1014 ret = TCM_ADDRESS_OUT_OF_RANGE;
1015 goto err;
1016 }
1017
1018 ret = do_unmap_fn(cmd, priv, lba, range);
1019 if (ret)
1020 goto err;
1021
1022 ptr += 16;
1023 size -= 16;
1024 }
1025
1026 err:
1027 transport_kunmap_data_sg(cmd);
1028 if (!ret)
1029 target_complete_cmd(cmd, GOOD);
1030 return ret;
1031 }
1032 EXPORT_SYMBOL(sbc_execute_unmap);
1033
1034 static sense_reason_t
1035 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1036 const void *p, sector_t sector, unsigned int ei_lba)
1037 {
1038 int block_size = dev->dev_attrib.block_size;
1039 __be16 csum;
1040
1041 csum = cpu_to_be16(crc_t10dif(p, block_size));
1042
1043 if (sdt->guard_tag != csum) {
1044 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1045 " csum 0x%04x\n", (unsigned long long)sector,
1046 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1047 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1048 }
1049
1050 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1051 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1052 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1053 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1054 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1055 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1056 }
1057
1058 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1059 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1060 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1061 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1062 be32_to_cpu(sdt->ref_tag), ei_lba);
1063 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1064 }
1065
1066 return 0;
1067 }
1068
1069 static void
1070 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1071 struct scatterlist *sg, int sg_off)
1072 {
1073 struct se_device *dev = cmd->se_dev;
1074 struct scatterlist *psg;
1075 void *paddr, *addr;
1076 unsigned int i, len, left;
1077 unsigned int offset = 0;
1078
1079 left = sectors * dev->prot_length;
1080
1081 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1082
1083 len = min(psg->length, left);
1084 if (offset >= sg->length) {
1085 sg = sg_next(sg);
1086 offset = 0;
1087 sg_off = sg->offset;
1088 }
1089
1090 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1091 addr = kmap_atomic(sg_page(sg)) + sg_off;
1092
1093 if (read)
1094 memcpy(paddr, addr, len);
1095 else
1096 memcpy(addr, paddr, len);
1097
1098 left -= len;
1099 offset += len;
1100 kunmap_atomic(paddr);
1101 kunmap_atomic(addr);
1102 }
1103 }
1104
1105 sense_reason_t
1106 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1107 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1108 {
1109 struct se_device *dev = cmd->se_dev;
1110 struct se_dif_v1_tuple *sdt;
1111 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1112 sector_t sector = start;
1113 void *daddr, *paddr;
1114 int i, j, offset = 0;
1115 sense_reason_t rc;
1116
1117 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1118 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1119 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1120
1121 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1122
1123 if (offset >= psg->length) {
1124 kunmap_atomic(paddr);
1125 psg = sg_next(psg);
1126 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1127 offset = 0;
1128 }
1129
1130 sdt = paddr + offset;
1131
1132 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1133 " app_tag: 0x%04x ref_tag: %u\n",
1134 (unsigned long long)sector, sdt->guard_tag,
1135 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1136
1137 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1138 ei_lba);
1139 if (rc) {
1140 kunmap_atomic(paddr);
1141 kunmap_atomic(daddr);
1142 cmd->bad_sector = sector;
1143 return rc;
1144 }
1145
1146 sector++;
1147 ei_lba++;
1148 offset += sizeof(struct se_dif_v1_tuple);
1149 }
1150
1151 kunmap_atomic(paddr);
1152 kunmap_atomic(daddr);
1153 }
1154 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1155
1156 return 0;
1157 }
1158 EXPORT_SYMBOL(sbc_dif_verify_write);
1159
1160 sense_reason_t
1161 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1162 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1163 {
1164 struct se_device *dev = cmd->se_dev;
1165 struct se_dif_v1_tuple *sdt;
1166 struct scatterlist *dsg;
1167 sector_t sector = start;
1168 void *daddr, *paddr;
1169 int i, j, offset = sg_off;
1170 sense_reason_t rc;
1171
1172 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1173 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1174 paddr = kmap_atomic(sg_page(sg)) + sg->offset;
1175
1176 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1177
1178 if (offset >= sg->length) {
1179 kunmap_atomic(paddr);
1180 sg = sg_next(sg);
1181 paddr = kmap_atomic(sg_page(sg)) + sg->offset;
1182 offset = 0;
1183 }
1184
1185 sdt = paddr + offset;
1186
1187 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1188 " app_tag: 0x%04x ref_tag: %u\n",
1189 (unsigned long long)sector, sdt->guard_tag,
1190 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1191
1192 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1193 sector++;
1194 offset += sizeof(struct se_dif_v1_tuple);
1195 continue;
1196 }
1197
1198 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1199 ei_lba);
1200 if (rc) {
1201 kunmap_atomic(paddr);
1202 kunmap_atomic(daddr);
1203 cmd->bad_sector = sector;
1204 return rc;
1205 }
1206
1207 sector++;
1208 ei_lba++;
1209 offset += sizeof(struct se_dif_v1_tuple);
1210 }
1211
1212 kunmap_atomic(paddr);
1213 kunmap_atomic(daddr);
1214 }
1215 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1216
1217 return 0;
1218 }
1219 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux with added FPC-III support