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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob401fc709793599f720fce3454d3ff73ba29b6023
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 <asm/unaligned.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_tcq.h>
29
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
33
34 #include "target_core_internal.h"
35 #include "target_core_ua.h"
36
37
38 static sense_reason_t
39 sbc_emulate_readcapacity(struct se_cmd *cmd)
40 {
41 struct se_device *dev = cmd->se_dev;
42 unsigned char *cdb = cmd->t_task_cdb;
43 unsigned long long blocks_long = dev->transport->get_blocks(dev);
44 unsigned char *rbuf;
45 unsigned char buf[8];
46 u32 blocks;
47
48 /*
49 * SBC-2 says:
50 * If the PMI bit is set to zero and the LOGICAL BLOCK
51 * ADDRESS field is not set to zero, the device server shall
52 * terminate the command with CHECK CONDITION status with
53 * the sense key set to ILLEGAL REQUEST and the additional
54 * sense code set to INVALID FIELD IN CDB.
55 *
56 * In SBC-3, these fields are obsolete, but some SCSI
57 * compliance tests actually check this, so we might as well
58 * follow SBC-2.
59 */
60 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
61 return TCM_INVALID_CDB_FIELD;
62
63 if (blocks_long >= 0x00000000ffffffff)
64 blocks = 0xffffffff;
65 else
66 blocks = (u32)blocks_long;
67
68 buf[0] = (blocks >> 24) & 0xff;
69 buf[1] = (blocks >> 16) & 0xff;
70 buf[2] = (blocks >> 8) & 0xff;
71 buf[3] = blocks & 0xff;
72 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
73 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
74 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
75 buf[7] = dev->dev_attrib.block_size & 0xff;
76
77 rbuf = transport_kmap_data_sg(cmd);
78 if (rbuf) {
79 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
80 transport_kunmap_data_sg(cmd);
81 }
82
83 target_complete_cmd_with_length(cmd, GOOD, 8);
84 return 0;
85 }
86
87 static sense_reason_t
88 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
89 {
90 struct se_device *dev = cmd->se_dev;
91 unsigned char *rbuf;
92 unsigned char buf[32];
93 unsigned long long blocks = dev->transport->get_blocks(dev);
94
95 memset(buf, 0, sizeof(buf));
96 buf[0] = (blocks >> 56) & 0xff;
97 buf[1] = (blocks >> 48) & 0xff;
98 buf[2] = (blocks >> 40) & 0xff;
99 buf[3] = (blocks >> 32) & 0xff;
100 buf[4] = (blocks >> 24) & 0xff;
101 buf[5] = (blocks >> 16) & 0xff;
102 buf[6] = (blocks >> 8) & 0xff;
103 buf[7] = blocks & 0xff;
104 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
105 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
106 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
107 buf[11] = dev->dev_attrib.block_size & 0xff;
108 /*
109 * Set Thin Provisioning Enable bit following sbc3r22 in section
110 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
111 */
112 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
113 buf[14] = 0x80;
114
115 rbuf = transport_kmap_data_sg(cmd);
116 if (rbuf) {
117 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
118 transport_kunmap_data_sg(cmd);
119 }
120
121 target_complete_cmd_with_length(cmd, GOOD, 32);
122 return 0;
123 }
124
125 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
126 {
127 u32 num_blocks;
128
129 if (cmd->t_task_cdb[0] == WRITE_SAME)
130 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
131 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
132 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
133 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
134 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
135
136 /*
137 * Use the explicit range when non zero is supplied, otherwise calculate
138 * the remaining range based on ->get_blocks() - starting LBA.
139 */
140 if (num_blocks)
141 return num_blocks;
142
143 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
144 cmd->t_task_lba + 1;
145 }
146 EXPORT_SYMBOL(sbc_get_write_same_sectors);
147
148 static sense_reason_t
149 sbc_emulate_noop(struct se_cmd *cmd)
150 {
151 target_complete_cmd(cmd, GOOD);
152 return 0;
153 }
154
155 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
156 {
157 return cmd->se_dev->dev_attrib.block_size * sectors;
158 }
159
160 static int sbc_check_valid_sectors(struct se_cmd *cmd)
161 {
162 struct se_device *dev = cmd->se_dev;
163 unsigned long long end_lba;
164 u32 sectors;
165
166 sectors = cmd->data_length / dev->dev_attrib.block_size;
167 end_lba = dev->transport->get_blocks(dev) + 1;
168
169 if (cmd->t_task_lba + sectors > end_lba) {
170 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
171 cmd->t_task_lba, sectors, end_lba);
172 return -EINVAL;
173 }
174
175 return 0;
176 }
177
178 static inline u32 transport_get_sectors_6(unsigned char *cdb)
179 {
180 /*
181 * Use 8-bit sector value. SBC-3 says:
182 *
183 * A TRANSFER LENGTH field set to zero specifies that 256
184 * logical blocks shall be written. Any other value
185 * specifies the number of logical blocks that shall be
186 * written.
187 */
188 return cdb[4] ? : 256;
189 }
190
191 static inline u32 transport_get_sectors_10(unsigned char *cdb)
192 {
193 return (u32)(cdb[7] << 8) + cdb[8];
194 }
195
196 static inline u32 transport_get_sectors_12(unsigned char *cdb)
197 {
198 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
199 }
200
201 static inline u32 transport_get_sectors_16(unsigned char *cdb)
202 {
203 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
204 (cdb[12] << 8) + cdb[13];
205 }
206
207 /*
208 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
209 */
210 static inline u32 transport_get_sectors_32(unsigned char *cdb)
211 {
212 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
213 (cdb[30] << 8) + cdb[31];
214
215 }
216
217 static inline u32 transport_lba_21(unsigned char *cdb)
218 {
219 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
220 }
221
222 static inline u32 transport_lba_32(unsigned char *cdb)
223 {
224 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
225 }
226
227 static inline unsigned long long transport_lba_64(unsigned char *cdb)
228 {
229 unsigned int __v1, __v2;
230
231 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
232 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
233
234 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
235 }
236
237 /*
238 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
239 */
240 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
241 {
242 unsigned int __v1, __v2;
243
244 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
245 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
246
247 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
248 }
249
250 static sense_reason_t
251 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
252 {
253 struct se_device *dev = cmd->se_dev;
254 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
255 unsigned int sectors = sbc_get_write_same_sectors(cmd);
256
257 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
258 pr_err("WRITE_SAME PBDATA and LBDATA"
259 " bits not supported for Block Discard"
260 " Emulation\n");
261 return TCM_UNSUPPORTED_SCSI_OPCODE;
262 }
263 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
264 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
265 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
266 return TCM_INVALID_CDB_FIELD;
267 }
268 /*
269 * Sanity check for LBA wrap and request past end of device.
270 */
271 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
272 ((cmd->t_task_lba + sectors) > end_lba)) {
273 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
274 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
275 return TCM_ADDRESS_OUT_OF_RANGE;
276 }
277
278 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
279 if (flags[0] & 0x10) {
280 pr_warn("WRITE SAME with ANCHOR not supported\n");
281 return TCM_INVALID_CDB_FIELD;
282 }
283 /*
284 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
285 * translated into block discard requests within backend code.
286 */
287 if (flags[0] & 0x08) {
288 if (!ops->execute_write_same_unmap)
289 return TCM_UNSUPPORTED_SCSI_OPCODE;
290
291 cmd->execute_cmd = ops->execute_write_same_unmap;
292 return 0;
293 }
294 if (!ops->execute_write_same)
295 return TCM_UNSUPPORTED_SCSI_OPCODE;
296
297 cmd->execute_cmd = ops->execute_write_same;
298 return 0;
299 }
300
301 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
302 int *post_ret)
303 {
304 unsigned char *buf, *addr;
305 struct scatterlist *sg;
306 unsigned int offset;
307 sense_reason_t ret = TCM_NO_SENSE;
308 int i, count;
309 /*
310 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
311 *
312 * 1) read the specified logical block(s);
313 * 2) transfer logical blocks from the data-out buffer;
314 * 3) XOR the logical blocks transferred from the data-out buffer with
315 * the logical blocks read, storing the resulting XOR data in a buffer;
316 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
317 * blocks transferred from the data-out buffer; and
318 * 5) transfer the resulting XOR data to the data-in buffer.
319 */
320 buf = kmalloc(cmd->data_length, GFP_KERNEL);
321 if (!buf) {
322 pr_err("Unable to allocate xor_callback buf\n");
323 return TCM_OUT_OF_RESOURCES;
324 }
325 /*
326 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
327 * into the locally allocated *buf
328 */
329 sg_copy_to_buffer(cmd->t_data_sg,
330 cmd->t_data_nents,
331 buf,
332 cmd->data_length);
333
334 /*
335 * Now perform the XOR against the BIDI read memory located at
336 * cmd->t_mem_bidi_list
337 */
338
339 offset = 0;
340 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
341 addr = kmap_atomic(sg_page(sg));
342 if (!addr) {
343 ret = TCM_OUT_OF_RESOURCES;
344 goto out;
345 }
346
347 for (i = 0; i < sg->length; i++)
348 *(addr + sg->offset + i) ^= *(buf + offset + i);
349
350 offset += sg->length;
351 kunmap_atomic(addr);
352 }
353
354 out:
355 kfree(buf);
356 return ret;
357 }
358
359 static sense_reason_t
360 sbc_execute_rw(struct se_cmd *cmd)
361 {
362 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
363 cmd->data_direction);
364 }
365
366 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
367 int *post_ret)
368 {
369 struct se_device *dev = cmd->se_dev;
370
371 /*
372 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
373 * within target_complete_ok_work() if the command was successfully
374 * sent to the backend driver.
375 */
376 spin_lock_irq(&cmd->t_state_lock);
377 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) {
378 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
379 *post_ret = 1;
380 }
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, bool success,
393 int *post_ret)
394 {
395 struct se_device *dev = cmd->se_dev;
396 struct scatterlist *write_sg = NULL, *sg;
397 unsigned char *buf = NULL, *addr;
398 struct sg_mapping_iter m;
399 unsigned int offset = 0, len;
400 unsigned int nlbas = cmd->t_task_nolb;
401 unsigned int block_size = dev->dev_attrib.block_size;
402 unsigned int compare_len = (nlbas * block_size);
403 sense_reason_t ret = TCM_NO_SENSE;
404 int rc, i;
405
406 /*
407 * Handle early failure in transport_generic_request_failure(),
408 * which will not have taken ->caw_sem yet..
409 */
410 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
411 return TCM_NO_SENSE;
412 /*
413 * Handle special case for zero-length COMPARE_AND_WRITE
414 */
415 if (!cmd->data_length)
416 goto out;
417 /*
418 * Immediately exit + release dev->caw_sem if command has already
419 * been failed with a non-zero SCSI status.
420 */
421 if (cmd->scsi_status) {
422 pr_err("compare_and_write_callback: non zero scsi_status:"
423 " 0x%02x\n", cmd->scsi_status);
424 goto out;
425 }
426
427 buf = kzalloc(cmd->data_length, GFP_KERNEL);
428 if (!buf) {
429 pr_err("Unable to allocate compare_and_write buf\n");
430 ret = TCM_OUT_OF_RESOURCES;
431 goto out;
432 }
433
434 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
435 GFP_KERNEL);
436 if (!write_sg) {
437 pr_err("Unable to allocate compare_and_write sg\n");
438 ret = TCM_OUT_OF_RESOURCES;
439 goto out;
440 }
441 sg_init_table(write_sg, cmd->t_data_nents);
442 /*
443 * Setup verify and write data payloads from total NumberLBAs.
444 */
445 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
446 cmd->data_length);
447 if (!rc) {
448 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
449 ret = TCM_OUT_OF_RESOURCES;
450 goto out;
451 }
452 /*
453 * Compare against SCSI READ payload against verify payload
454 */
455 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
456 addr = (unsigned char *)kmap_atomic(sg_page(sg));
457 if (!addr) {
458 ret = TCM_OUT_OF_RESOURCES;
459 goto out;
460 }
461
462 len = min(sg->length, compare_len);
463
464 if (memcmp(addr, buf + offset, len)) {
465 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
466 addr, buf + offset);
467 kunmap_atomic(addr);
468 goto miscompare;
469 }
470 kunmap_atomic(addr);
471
472 offset += len;
473 compare_len -= len;
474 if (!compare_len)
475 break;
476 }
477
478 i = 0;
479 len = cmd->t_task_nolb * block_size;
480 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
481 /*
482 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
483 */
484 while (len) {
485 sg_miter_next(&m);
486
487 if (block_size < PAGE_SIZE) {
488 sg_set_page(&write_sg[i], m.page, block_size,
489 m.piter.sg->offset + block_size);
490 } else {
491 sg_miter_next(&m);
492 sg_set_page(&write_sg[i], m.page, block_size,
493 m.piter.sg->offset);
494 }
495 len -= block_size;
496 i++;
497 }
498 sg_miter_stop(&m);
499 /*
500 * Save the original SGL + nents values before updating to new
501 * assignments, to be released in transport_free_pages() ->
502 * transport_reset_sgl_orig()
503 */
504 cmd->t_data_sg_orig = cmd->t_data_sg;
505 cmd->t_data_sg = write_sg;
506 cmd->t_data_nents_orig = cmd->t_data_nents;
507 cmd->t_data_nents = 1;
508
509 cmd->sam_task_attr = MSG_HEAD_TAG;
510 cmd->transport_complete_callback = compare_and_write_post;
511 /*
512 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
513 * for submitting the adjusted SGL to write instance user-data.
514 */
515 cmd->execute_cmd = sbc_execute_rw;
516
517 spin_lock_irq(&cmd->t_state_lock);
518 cmd->t_state = TRANSPORT_PROCESSING;
519 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
520 spin_unlock_irq(&cmd->t_state_lock);
521
522 __target_execute_cmd(cmd);
523
524 kfree(buf);
525 return ret;
526
527 miscompare:
528 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
529 dev->transport->name);
530 ret = TCM_MISCOMPARE_VERIFY;
531 out:
532 /*
533 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
534 * sbc_compare_and_write() before the original READ I/O submission.
535 */
536 up(&dev->caw_sem);
537 kfree(write_sg);
538 kfree(buf);
539 return ret;
540 }
541
542 static sense_reason_t
543 sbc_compare_and_write(struct se_cmd *cmd)
544 {
545 struct se_device *dev = cmd->se_dev;
546 sense_reason_t ret;
547 int rc;
548 /*
549 * Submit the READ first for COMPARE_AND_WRITE to perform the
550 * comparision using SGLs at cmd->t_bidi_data_sg..
551 */
552 rc = down_interruptible(&dev->caw_sem);
553 if ((rc != 0) || signal_pending(current)) {
554 cmd->transport_complete_callback = NULL;
555 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
556 }
557 /*
558 * Reset cmd->data_length to individual block_size in order to not
559 * confuse backend drivers that depend on this value matching the
560 * size of the I/O being submitted.
561 */
562 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
563
564 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
565 DMA_FROM_DEVICE);
566 if (ret) {
567 cmd->transport_complete_callback = NULL;
568 up(&dev->caw_sem);
569 return ret;
570 }
571 /*
572 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
573 * upon MISCOMPARE, or in compare_and_write_done() upon completion
574 * of WRITE instance user-data.
575 */
576 return TCM_NO_SENSE;
577 }
578
579 sense_reason_t
580 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
581 {
582 struct se_device *dev = cmd->se_dev;
583 unsigned char *cdb = cmd->t_task_cdb;
584 unsigned int size;
585 u32 sectors = 0;
586 sense_reason_t ret;
587
588 switch (cdb[0]) {
589 case READ_6:
590 sectors = transport_get_sectors_6(cdb);
591 cmd->t_task_lba = transport_lba_21(cdb);
592 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
593 cmd->execute_rw = ops->execute_rw;
594 cmd->execute_cmd = sbc_execute_rw;
595 break;
596 case READ_10:
597 sectors = transport_get_sectors_10(cdb);
598 cmd->t_task_lba = transport_lba_32(cdb);
599 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
600 cmd->execute_rw = ops->execute_rw;
601 cmd->execute_cmd = sbc_execute_rw;
602 break;
603 case READ_12:
604 sectors = transport_get_sectors_12(cdb);
605 cmd->t_task_lba = transport_lba_32(cdb);
606 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
607 cmd->execute_rw = ops->execute_rw;
608 cmd->execute_cmd = sbc_execute_rw;
609 break;
610 case READ_16:
611 sectors = transport_get_sectors_16(cdb);
612 cmd->t_task_lba = transport_lba_64(cdb);
613 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
614 cmd->execute_rw = ops->execute_rw;
615 cmd->execute_cmd = sbc_execute_rw;
616 break;
617 case WRITE_6:
618 sectors = transport_get_sectors_6(cdb);
619 cmd->t_task_lba = transport_lba_21(cdb);
620 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
621 cmd->execute_rw = ops->execute_rw;
622 cmd->execute_cmd = sbc_execute_rw;
623 break;
624 case WRITE_10:
625 case WRITE_VERIFY:
626 sectors = transport_get_sectors_10(cdb);
627 cmd->t_task_lba = transport_lba_32(cdb);
628 if (cdb[1] & 0x8)
629 cmd->se_cmd_flags |= SCF_FUA;
630 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
631 cmd->execute_rw = ops->execute_rw;
632 cmd->execute_cmd = sbc_execute_rw;
633 break;
634 case WRITE_12:
635 sectors = transport_get_sectors_12(cdb);
636 cmd->t_task_lba = transport_lba_32(cdb);
637 if (cdb[1] & 0x8)
638 cmd->se_cmd_flags |= SCF_FUA;
639 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
640 cmd->execute_rw = ops->execute_rw;
641 cmd->execute_cmd = sbc_execute_rw;
642 break;
643 case WRITE_16:
644 sectors = transport_get_sectors_16(cdb);
645 cmd->t_task_lba = transport_lba_64(cdb);
646 if (cdb[1] & 0x8)
647 cmd->se_cmd_flags |= SCF_FUA;
648 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
649 cmd->execute_rw = ops->execute_rw;
650 cmd->execute_cmd = sbc_execute_rw;
651 break;
652 case XDWRITEREAD_10:
653 if (cmd->data_direction != DMA_TO_DEVICE ||
654 !(cmd->se_cmd_flags & SCF_BIDI))
655 return TCM_INVALID_CDB_FIELD;
656 sectors = transport_get_sectors_10(cdb);
657
658 cmd->t_task_lba = transport_lba_32(cdb);
659 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
660
661 /*
662 * Setup BIDI XOR callback to be run after I/O completion.
663 */
664 cmd->execute_rw = ops->execute_rw;
665 cmd->execute_cmd = sbc_execute_rw;
666 cmd->transport_complete_callback = &xdreadwrite_callback;
667 if (cdb[1] & 0x8)
668 cmd->se_cmd_flags |= SCF_FUA;
669 break;
670 case VARIABLE_LENGTH_CMD:
671 {
672 u16 service_action = get_unaligned_be16(&cdb[8]);
673 switch (service_action) {
674 case XDWRITEREAD_32:
675 sectors = transport_get_sectors_32(cdb);
676
677 /*
678 * Use WRITE_32 and READ_32 opcodes for the emulated
679 * XDWRITE_READ_32 logic.
680 */
681 cmd->t_task_lba = transport_lba_64_ext(cdb);
682 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
683
684 /*
685 * Setup BIDI XOR callback to be run during after I/O
686 * completion.
687 */
688 cmd->execute_rw = ops->execute_rw;
689 cmd->execute_cmd = sbc_execute_rw;
690 cmd->transport_complete_callback = &xdreadwrite_callback;
691 if (cdb[1] & 0x8)
692 cmd->se_cmd_flags |= SCF_FUA;
693 break;
694 case WRITE_SAME_32:
695 sectors = transport_get_sectors_32(cdb);
696 if (!sectors) {
697 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
698 " supported\n");
699 return TCM_INVALID_CDB_FIELD;
700 }
701
702 size = sbc_get_size(cmd, 1);
703 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
704
705 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
706 if (ret)
707 return ret;
708 break;
709 default:
710 pr_err("VARIABLE_LENGTH_CMD service action"
711 " 0x%04x not supported\n", service_action);
712 return TCM_UNSUPPORTED_SCSI_OPCODE;
713 }
714 break;
715 }
716 case COMPARE_AND_WRITE:
717 sectors = cdb[13];
718 /*
719 * Currently enforce COMPARE_AND_WRITE for a single sector
720 */
721 if (sectors > 1) {
722 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
723 " than 1\n", sectors);
724 return TCM_INVALID_CDB_FIELD;
725 }
726 /*
727 * Double size because we have two buffers, note that
728 * zero is not an error..
729 */
730 size = 2 * sbc_get_size(cmd, sectors);
731 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
732 cmd->t_task_nolb = sectors;
733 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
734 cmd->execute_rw = ops->execute_rw;
735 cmd->execute_cmd = sbc_compare_and_write;
736 cmd->transport_complete_callback = compare_and_write_callback;
737 break;
738 case READ_CAPACITY:
739 size = READ_CAP_LEN;
740 cmd->execute_cmd = sbc_emulate_readcapacity;
741 break;
742 case SERVICE_ACTION_IN:
743 switch (cmd->t_task_cdb[1] & 0x1f) {
744 case SAI_READ_CAPACITY_16:
745 cmd->execute_cmd = sbc_emulate_readcapacity_16;
746 break;
747 default:
748 pr_err("Unsupported SA: 0x%02x\n",
749 cmd->t_task_cdb[1] & 0x1f);
750 return TCM_INVALID_CDB_FIELD;
751 }
752 size = (cdb[10] << 24) | (cdb[11] << 16) |
753 (cdb[12] << 8) | cdb[13];
754 break;
755 case SYNCHRONIZE_CACHE:
756 case SYNCHRONIZE_CACHE_16:
757 if (!ops->execute_sync_cache) {
758 size = 0;
759 cmd->execute_cmd = sbc_emulate_noop;
760 break;
761 }
762
763 /*
764 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
765 */
766 if (cdb[0] == SYNCHRONIZE_CACHE) {
767 sectors = transport_get_sectors_10(cdb);
768 cmd->t_task_lba = transport_lba_32(cdb);
769 } else {
770 sectors = transport_get_sectors_16(cdb);
771 cmd->t_task_lba = transport_lba_64(cdb);
772 }
773
774 size = sbc_get_size(cmd, sectors);
775
776 /*
777 * Check to ensure that LBA + Range does not exceed past end of
778 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
779 */
780 if (cmd->t_task_lba || sectors) {
781 if (sbc_check_valid_sectors(cmd) < 0)
782 return TCM_ADDRESS_OUT_OF_RANGE;
783 }
784 cmd->execute_cmd = ops->execute_sync_cache;
785 break;
786 case UNMAP:
787 if (!ops->execute_unmap)
788 return TCM_UNSUPPORTED_SCSI_OPCODE;
789
790 size = get_unaligned_be16(&cdb[7]);
791 cmd->execute_cmd = ops->execute_unmap;
792 break;
793 case WRITE_SAME_16:
794 sectors = transport_get_sectors_16(cdb);
795 if (!sectors) {
796 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
797 return TCM_INVALID_CDB_FIELD;
798 }
799
800 size = sbc_get_size(cmd, 1);
801 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
802
803 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
804 if (ret)
805 return ret;
806 break;
807 case WRITE_SAME:
808 sectors = transport_get_sectors_10(cdb);
809 if (!sectors) {
810 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
811 return TCM_INVALID_CDB_FIELD;
812 }
813
814 size = sbc_get_size(cmd, 1);
815 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
816
817 /*
818 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
819 * of byte 1 bit 3 UNMAP instead of original reserved field
820 */
821 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
822 if (ret)
823 return ret;
824 break;
825 case VERIFY:
826 size = 0;
827 cmd->execute_cmd = sbc_emulate_noop;
828 break;
829 case REZERO_UNIT:
830 case SEEK_6:
831 case SEEK_10:
832 /*
833 * There are still clients out there which use these old SCSI-2
834 * commands. This mainly happens when running VMs with legacy
835 * guest systems, connected via SCSI command pass-through to
836 * iSCSI targets. Make them happy and return status GOOD.
837 */
838 size = 0;
839 cmd->execute_cmd = sbc_emulate_noop;
840 break;
841 default:
842 ret = spc_parse_cdb(cmd, &size);
843 if (ret)
844 return ret;
845 }
846
847 /* reject any command that we don't have a handler for */
848 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
849 return TCM_UNSUPPORTED_SCSI_OPCODE;
850
851 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
852 unsigned long long end_lba;
853
854 end_lba = dev->transport->get_blocks(dev) + 1;
855 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
856 ((cmd->t_task_lba + sectors) > end_lba)) {
857 pr_err("cmd exceeds last lba %llu "
858 "(lba %llu, sectors %u)\n",
859 end_lba, cmd->t_task_lba, sectors);
860 return TCM_ADDRESS_OUT_OF_RANGE;
861 }
862
863 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
864 size = sbc_get_size(cmd, sectors);
865 }
866
867 return target_cmd_size_check(cmd, size);
868 }
869 EXPORT_SYMBOL(sbc_parse_cdb);
870
871 u32 sbc_get_device_type(struct se_device *dev)
872 {
873 return TYPE_DISK;
874 }
875 EXPORT_SYMBOL(sbc_get_device_type);
876
877 sense_reason_t
878 sbc_execute_unmap(struct se_cmd *cmd,
879 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
880 sector_t, sector_t),
881 void *priv)
882 {
883 struct se_device *dev = cmd->se_dev;
884 unsigned char *buf, *ptr = NULL;
885 sector_t lba;
886 int size;
887 u32 range;
888 sense_reason_t ret = 0;
889 int dl, bd_dl;
890
891 /* We never set ANC_SUP */
892 if (cmd->t_task_cdb[1])
893 return TCM_INVALID_CDB_FIELD;
894
895 if (cmd->data_length == 0) {
896 target_complete_cmd(cmd, SAM_STAT_GOOD);
897 return 0;
898 }
899
900 if (cmd->data_length < 8) {
901 pr_warn("UNMAP parameter list length %u too small\n",
902 cmd->data_length);
903 return TCM_PARAMETER_LIST_LENGTH_ERROR;
904 }
905
906 buf = transport_kmap_data_sg(cmd);
907 if (!buf)
908 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
909
910 dl = get_unaligned_be16(&buf[0]);
911 bd_dl = get_unaligned_be16(&buf[2]);
912
913 size = cmd->data_length - 8;
914 if (bd_dl > size)
915 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
916 cmd->data_length, bd_dl);
917 else
918 size = bd_dl;
919
920 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
921 ret = TCM_INVALID_PARAMETER_LIST;
922 goto err;
923 }
924
925 /* First UNMAP block descriptor starts at 8 byte offset */
926 ptr = &buf[8];
927 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
928 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
929
930 while (size >= 16) {
931 lba = get_unaligned_be64(&ptr[0]);
932 range = get_unaligned_be32(&ptr[8]);
933 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
934 (unsigned long long)lba, range);
935
936 if (range > dev->dev_attrib.max_unmap_lba_count) {
937 ret = TCM_INVALID_PARAMETER_LIST;
938 goto err;
939 }
940
941 if (lba + range > dev->transport->get_blocks(dev) + 1) {
942 ret = TCM_ADDRESS_OUT_OF_RANGE;
943 goto err;
944 }
945
946 ret = do_unmap_fn(cmd, priv, lba, range);
947 if (ret)
948 goto err;
949
950 ptr += 16;
951 size -= 16;
952 }
953
954 err:
955 transport_kunmap_data_sg(cmd);
956 if (!ret)
957 target_complete_cmd(cmd, GOOD);
958 return ret;
959 }
960 EXPORT_SYMBOL(sbc_execute_unmap);
Linux with added FPC-III support