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1/*
2 * SCSI Zoned Block commands
3 *
4 * Copyright (C) 2014-2015 SUSE Linux GmbH
5 * Written by: Hannes Reinecke <hare@suse.de>
6 * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
7 * Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * 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; see the file COPYING. If not, write to
20 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
21 * USA.
22 *
23 */
24
25#include <linux/blkdev.h>
26
27#include <asm/unaligned.h>
28
29#include <scsi/scsi.h>
30#include <scsi/scsi_cmnd.h>
31
32#include "sd.h"
33
34/**
35 * sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
36 * @sdkp: The disk the report originated from
37 * @buf: Address of the report zone descriptor
38 * @zone: the destination zone structure
39 *
40 * All LBA sized values are converted to 512B sectors unit.
41 */
42static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
43 struct blk_zone *zone)
44{
45 struct scsi_device *sdp = sdkp->device;
46
47 memset(zone, 0, sizeof(struct blk_zone));
48
49 zone->type = buf[0] & 0x0f;
50 zone->cond = (buf[1] >> 4) & 0xf;
51 if (buf[1] & 0x01)
52 zone->reset = 1;
53 if (buf[1] & 0x02)
54 zone->non_seq = 1;
55
56 zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
57 zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16]));
58 zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
59 if (zone->type != ZBC_ZONE_TYPE_CONV &&
60 zone->cond == ZBC_ZONE_COND_FULL)
61 zone->wp = zone->start + zone->len;
62}
63
64/**
65 * sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
66 * @sdkp: The target disk
67 * @buf: Buffer to use for the reply
68 * @buflen: the buffer size
69 * @lba: Start LBA of the report
70 *
71 * For internal use during device validation.
72 */
73static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
74 unsigned int buflen, sector_t lba)
75{
76 struct scsi_device *sdp = sdkp->device;
77 const int timeout = sdp->request_queue->rq_timeout;
78 struct scsi_sense_hdr sshdr;
79 unsigned char cmd[16];
80 unsigned int rep_len;
81 int result;
82
83 memset(cmd, 0, 16);
84 cmd[0] = ZBC_IN;
85 cmd[1] = ZI_REPORT_ZONES;
86 put_unaligned_be64(lba, &cmd[2]);
87 put_unaligned_be32(buflen, &cmd[10]);
88 memset(buf, 0, buflen);
89
90 result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
91 buf, buflen, &sshdr,
92 timeout, SD_MAX_RETRIES, NULL);
93 if (result) {
94 sd_printk(KERN_ERR, sdkp,
95 "REPORT ZONES lba %llu failed with %d/%d\n",
96 (unsigned long long)lba,
97 host_byte(result), driver_byte(result));
98 return -EIO;
99 }
100
101 rep_len = get_unaligned_be32(&buf[0]);
102 if (rep_len < 64) {
103 sd_printk(KERN_ERR, sdkp,
104 "REPORT ZONES report invalid length %u\n",
105 rep_len);
106 return -EIO;
107 }
108
109 return 0;
110}
111
112/**
113 * sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
114 * @cmd: The command to setup
115 *
116 * Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
117 */
118int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
119{
120 struct request *rq = cmd->request;
121 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
122 sector_t lba, sector = blk_rq_pos(rq);
123 unsigned int nr_bytes = blk_rq_bytes(rq);
124 int ret;
125
126 WARN_ON(nr_bytes == 0);
127
128 if (!sd_is_zoned(sdkp))
129 /* Not a zoned device */
130 return BLKPREP_KILL;
131
132 ret = scsi_init_io(cmd);
133 if (ret != BLKPREP_OK)
134 return ret;
135
136 cmd->cmd_len = 16;
137 memset(cmd->cmnd, 0, cmd->cmd_len);
138 cmd->cmnd[0] = ZBC_IN;
139 cmd->cmnd[1] = ZI_REPORT_ZONES;
140 lba = sectors_to_logical(sdkp->device, sector);
141 put_unaligned_be64(lba, &cmd->cmnd[2]);
142 put_unaligned_be32(nr_bytes, &cmd->cmnd[10]);
143 /* Do partial report for speeding things up */
144 cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL;
145
146 cmd->sc_data_direction = DMA_FROM_DEVICE;
147 cmd->sdb.length = nr_bytes;
148 cmd->transfersize = sdkp->device->sector_size;
149 cmd->allowed = 0;
150
151 /*
152 * Report may return less bytes than requested. Make sure
153 * to report completion on the entire initial request.
154 */
155 rq->__data_len = nr_bytes;
156
157 return BLKPREP_OK;
158}
159
160/**
161 * sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
162 * @scmd: The completed report zones command
163 * @good_bytes: reply size in bytes
164 *
165 * Convert all reported zone descriptors to struct blk_zone. The conversion
166 * is done in-place, directly in the request specified sg buffer.
167 */
168static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
169 unsigned int good_bytes)
170{
171 struct request *rq = scmd->request;
172 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
173 struct sg_mapping_iter miter;
174 struct blk_zone_report_hdr hdr;
175 struct blk_zone zone;
176 unsigned int offset, bytes = 0;
177 unsigned long flags;
178 u8 *buf;
179
180 if (good_bytes < 64)
181 return;
182
183 memset(&hdr, 0, sizeof(struct blk_zone_report_hdr));
184
185 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
186 SG_MITER_TO_SG | SG_MITER_ATOMIC);
187
188 local_irq_save(flags);
189 while (sg_miter_next(&miter) && bytes < good_bytes) {
190
191 buf = miter.addr;
192 offset = 0;
193
194 if (bytes == 0) {
195 /* Set the report header */
196 hdr.nr_zones = min_t(unsigned int,
197 (good_bytes - 64) / 64,
198 get_unaligned_be32(&buf[0]) / 64);
199 memcpy(buf, &hdr, sizeof(struct blk_zone_report_hdr));
200 offset += 64;
201 bytes += 64;
202 }
203
204 /* Parse zone descriptors */
205 while (offset < miter.length && hdr.nr_zones) {
206 WARN_ON(offset > miter.length);
207 buf = miter.addr + offset;
208 sd_zbc_parse_report(sdkp, buf, &zone);
209 memcpy(buf, &zone, sizeof(struct blk_zone));
210 offset += 64;
211 bytes += 64;
212 hdr.nr_zones--;
213 }
214
215 if (!hdr.nr_zones)
216 break;
217
218 }
219 sg_miter_stop(&miter);
220 local_irq_restore(flags);
221}
222
223/**
224 * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
225 * @sdkp: The target disk
226 */
227static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
228{
229 return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
230}
231
232/**
233 * sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
234 * @cmd: the command to setup
235 *
236 * Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
237 */
238int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
239{
240 struct request *rq = cmd->request;
241 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
242 sector_t sector = blk_rq_pos(rq);
243 sector_t block = sectors_to_logical(sdkp->device, sector);
244
245 if (!sd_is_zoned(sdkp))
246 /* Not a zoned device */
247 return BLKPREP_KILL;
248
249 if (sdkp->device->changed)
250 return BLKPREP_KILL;
251
252 if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
253 /* Unaligned request */
254 return BLKPREP_KILL;
255
256 cmd->cmd_len = 16;
257 memset(cmd->cmnd, 0, cmd->cmd_len);
258 cmd->cmnd[0] = ZBC_OUT;
259 cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
260 put_unaligned_be64(block, &cmd->cmnd[2]);
261
262 rq->timeout = SD_TIMEOUT;
263 cmd->sc_data_direction = DMA_NONE;
264 cmd->transfersize = 0;
265 cmd->allowed = 0;
266
267 return BLKPREP_OK;
268}
269
270/**
271 * sd_zbc_complete - ZBC command post processing.
272 * @cmd: Completed command
273 * @good_bytes: Command reply bytes
274 * @sshdr: command sense header
275 *
276 * Called from sd_done(). Process report zones reply and handle reset zone
277 * and write commands errors.
278 */
279void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
280 struct scsi_sense_hdr *sshdr)
281{
282 int result = cmd->result;
283 struct request *rq = cmd->request;
284
285 switch (req_op(rq)) {
286 case REQ_OP_ZONE_RESET:
287
288 if (result &&
289 sshdr->sense_key == ILLEGAL_REQUEST &&
290 sshdr->asc == 0x24)
291 /*
292 * INVALID FIELD IN CDB error: reset of a conventional
293 * zone was attempted. Nothing to worry about, so be
294 * quiet about the error.
295 */
296 rq->rq_flags |= RQF_QUIET;
297 break;
298
299 case REQ_OP_WRITE:
300 case REQ_OP_WRITE_ZEROES:
301 case REQ_OP_WRITE_SAME:
302
303 if (result &&
304 sshdr->sense_key == ILLEGAL_REQUEST &&
305 sshdr->asc == 0x21)
306 /*
307 * INVALID ADDRESS FOR WRITE error: It is unlikely that
308 * retrying write requests failed with any kind of
309 * alignement error will result in success. So don't.
310 */
311 cmd->allowed = 0;
312 break;
313
314 case REQ_OP_ZONE_REPORT:
315
316 if (!result)
317 sd_zbc_report_zones_complete(cmd, good_bytes);
318 break;
319
320 }
321}
322
323/**
324 * sd_zbc_read_zoned_characteristics - Read zoned block device characteristics
325 * @sdkp: Target disk
326 * @buf: Buffer where to store the VPD page data
327 *
328 * Read VPD page B6.
329 */
330static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
331 unsigned char *buf)
332{
333
334 if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
335 sd_printk(KERN_NOTICE, sdkp,
336 "Unconstrained-read check failed\n");
337 return -ENODEV;
338 }
339
340 if (sdkp->device->type != TYPE_ZBC) {
341 /* Host-aware */
342 sdkp->urswrz = 1;
343 sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
344 sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
345 sdkp->zones_max_open = 0;
346 } else {
347 /* Host-managed */
348 sdkp->urswrz = buf[4] & 1;
349 sdkp->zones_optimal_open = 0;
350 sdkp->zones_optimal_nonseq = 0;
351 sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
352 }
353
354 return 0;
355}
356
357/**
358 * sd_zbc_check_capacity - Check reported capacity.
359 * @sdkp: Target disk
360 * @buf: Buffer to use for commands
361 *
362 * ZBC drive may report only the capacity of the first conventional zones at
363 * LBA 0. This is indicated by the RC_BASIS field of the read capacity reply.
364 * Check this here. If the disk reported only its conventional zones capacity,
365 * get the total capacity by doing a report zones.
366 */
367static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
368{
369 sector_t lba;
370 int ret;
371
372 if (sdkp->rc_basis != 0)
373 return 0;
374
375 /* Do a report zone to get the maximum LBA to check capacity */
376 ret = sd_zbc_report_zones(sdkp, buf, SD_BUF_SIZE, 0);
377 if (ret)
378 return ret;
379
380 /* The max_lba field is the capacity of this device */
381 lba = get_unaligned_be64(&buf[8]);
382 if (lba + 1 == sdkp->capacity)
383 return 0;
384
385 if (sdkp->first_scan)
386 sd_printk(KERN_WARNING, sdkp,
387 "Changing capacity from %llu to max LBA+1 %llu\n",
388 (unsigned long long)sdkp->capacity,
389 (unsigned long long)lba + 1);
390 sdkp->capacity = lba + 1;
391
392 return 0;
393}
394
395#define SD_ZBC_BUF_SIZE 131072U
396
397/**
398 * sd_zbc_check_zone_size - Check the device zone sizes
399 * @sdkp: Target disk
400 *
401 * Check that all zones of the device are equal. The last zone can however
402 * be smaller. The zone size must also be a power of two number of LBAs.
403 *
404 * Returns the zone size in bytes upon success or an error code upon failure.
405 */
406static s64 sd_zbc_check_zone_size(struct scsi_disk *sdkp)
407{
408 u64 zone_blocks = 0;
409 sector_t block = 0;
410 unsigned char *buf;
411 unsigned char *rec;
412 unsigned int buf_len;
413 unsigned int list_length;
414 int ret;
415 u8 same;
416
417 /* Get a buffer */
418 buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
419 if (!buf)
420 return -ENOMEM;
421
422 /* Do a report zone to get the same field */
423 ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0);
424 if (ret)
425 goto out_free;
426
427 same = buf[4] & 0x0f;
428 if (same > 0) {
429 rec = &buf[64];
430 zone_blocks = get_unaligned_be64(&rec[8]);
431 goto out;
432 }
433
434 /*
435 * Check the size of all zones: all zones must be of
436 * equal size, except the last zone which can be smaller
437 * than other zones.
438 */
439 do {
440
441 /* Parse REPORT ZONES header */
442 list_length = get_unaligned_be32(&buf[0]) + 64;
443 rec = buf + 64;
444 buf_len = min(list_length, SD_ZBC_BUF_SIZE);
445
446 /* Parse zone descriptors */
447 while (rec < buf + buf_len) {
448 u64 this_zone_blocks = get_unaligned_be64(&rec[8]);
449
450 if (zone_blocks == 0) {
451 zone_blocks = this_zone_blocks;
452 } else if (this_zone_blocks != zone_blocks &&
453 (block + this_zone_blocks < sdkp->capacity
454 || this_zone_blocks > zone_blocks)) {
455 this_zone_blocks = 0;
456 goto out;
457 }
458 block += this_zone_blocks;
459 rec += 64;
460 }
461
462 if (block < sdkp->capacity) {
463 ret = sd_zbc_report_zones(sdkp, buf,
464 SD_ZBC_BUF_SIZE, block);
465 if (ret)
466 goto out_free;
467 }
468
469 } while (block < sdkp->capacity);
470
471out:
472 if (!zone_blocks) {
473 if (sdkp->first_scan)
474 sd_printk(KERN_NOTICE, sdkp,
475 "Devices with non constant zone "
476 "size are not supported\n");
477 ret = -ENODEV;
478 } else if (!is_power_of_2(zone_blocks)) {
479 if (sdkp->first_scan)
480 sd_printk(KERN_NOTICE, sdkp,
481 "Devices with non power of 2 zone "
482 "size are not supported\n");
483 ret = -ENODEV;
484 } else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
485 if (sdkp->first_scan)
486 sd_printk(KERN_NOTICE, sdkp,
487 "Zone size too large\n");
488 ret = -ENODEV;
489 } else {
490 ret = zone_blocks;
491 }
492
493out_free:
494 kfree(buf);
495
496 return ret;
497}
498
499/**
500 * sd_zbc_alloc_zone_bitmap - Allocate a zone bitmap (one bit per zone).
501 * @nr_zones: Number of zones to allocate space for.
502 * @numa_node: NUMA node to allocate the memory from.
503 */
504static inline unsigned long *
505sd_zbc_alloc_zone_bitmap(u32 nr_zones, int numa_node)
506{
507 return kzalloc_node(BITS_TO_LONGS(nr_zones) * sizeof(unsigned long),
508 GFP_KERNEL, numa_node);
509}
510
511/**
512 * sd_zbc_get_seq_zones - Parse report zones reply to identify sequential zones
513 * @sdkp: disk used
514 * @buf: report reply buffer
515 * @buflen: length of @buf
516 * @zone_shift: logarithm base 2 of the number of blocks in a zone
517 * @seq_zones_bitmap: bitmap of sequential zones to set
518 *
519 * Parse reported zone descriptors in @buf to identify sequential zones and
520 * set the reported zone bit in @seq_zones_bitmap accordingly.
521 * Since read-only and offline zones cannot be written, do not
522 * mark them as sequential in the bitmap.
523 * Return the LBA after the last zone reported.
524 */
525static sector_t sd_zbc_get_seq_zones(struct scsi_disk *sdkp, unsigned char *buf,
526 unsigned int buflen, u32 zone_shift,
527 unsigned long *seq_zones_bitmap)
528{
529 sector_t lba, next_lba = sdkp->capacity;
530 unsigned int buf_len, list_length;
531 unsigned char *rec;
532 u8 type, cond;
533
534 list_length = get_unaligned_be32(&buf[0]) + 64;
535 buf_len = min(list_length, buflen);
536 rec = buf + 64;
537
538 while (rec < buf + buf_len) {
539 type = rec[0] & 0x0f;
540 cond = (rec[1] >> 4) & 0xf;
541 lba = get_unaligned_be64(&rec[16]);
542 if (type != ZBC_ZONE_TYPE_CONV &&
543 cond != ZBC_ZONE_COND_READONLY &&
544 cond != ZBC_ZONE_COND_OFFLINE)
545 set_bit(lba >> zone_shift, seq_zones_bitmap);
546 next_lba = lba + get_unaligned_be64(&rec[8]);
547 rec += 64;
548 }
549
550 return next_lba;
551}
552
553/**
554 * sd_zbc_setup_seq_zones_bitmap - Initialize a seq zone bitmap.
555 * @sdkp: target disk
556 * @zone_shift: logarithm base 2 of the number of blocks in a zone
557 * @nr_zones: number of zones to set up a seq zone bitmap for
558 *
559 * Allocate a zone bitmap and initialize it by identifying sequential zones.
560 */
561static unsigned long *
562sd_zbc_setup_seq_zones_bitmap(struct scsi_disk *sdkp, u32 zone_shift,
563 u32 nr_zones)
564{
565 struct request_queue *q = sdkp->disk->queue;
566 unsigned long *seq_zones_bitmap;
567 sector_t lba = 0;
568 unsigned char *buf;
569 int ret = -ENOMEM;
570
571 seq_zones_bitmap = sd_zbc_alloc_zone_bitmap(nr_zones, q->node);
572 if (!seq_zones_bitmap)
573 return ERR_PTR(-ENOMEM);
574
575 buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
576 if (!buf)
577 goto out;
578
579 while (lba < sdkp->capacity) {
580 ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba);
581 if (ret)
582 goto out;
583 lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
584 zone_shift, seq_zones_bitmap);
585 }
586
587 if (lba != sdkp->capacity) {
588 /* Something went wrong */
589 ret = -EIO;
590 }
591
592out:
593 kfree(buf);
594 if (ret) {
595 kfree(seq_zones_bitmap);
596 return ERR_PTR(ret);
597 }
598 return seq_zones_bitmap;
599}
600
601static void sd_zbc_cleanup(struct scsi_disk *sdkp)
602{
603 struct request_queue *q = sdkp->disk->queue;
604
605 kfree(q->seq_zones_bitmap);
606 q->seq_zones_bitmap = NULL;
607
608 kfree(q->seq_zones_wlock);
609 q->seq_zones_wlock = NULL;
610
611 q->nr_zones = 0;
612}
613
614static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)
615{
616 struct request_queue *q = sdkp->disk->queue;
617 u32 zone_shift = ilog2(zone_blocks);
618 u32 nr_zones;
619 int ret;
620
621 /* chunk_sectors indicates the zone size */
622 blk_queue_chunk_sectors(q,
623 logical_to_sectors(sdkp->device, zone_blocks));
624 nr_zones = round_up(sdkp->capacity, zone_blocks) >> zone_shift;
625
626 /*
627 * Initialize the device request queue information if the number
628 * of zones changed.
629 */
630 if (nr_zones != sdkp->nr_zones || nr_zones != q->nr_zones) {
631 unsigned long *seq_zones_wlock = NULL, *seq_zones_bitmap = NULL;
632 size_t zone_bitmap_size;
633
634 if (nr_zones) {
635 seq_zones_wlock = sd_zbc_alloc_zone_bitmap(nr_zones,
636 q->node);
637 if (!seq_zones_wlock) {
638 ret = -ENOMEM;
639 goto err;
640 }
641
642 seq_zones_bitmap = sd_zbc_setup_seq_zones_bitmap(sdkp,
643 zone_shift, nr_zones);
644 if (IS_ERR(seq_zones_bitmap)) {
645 ret = PTR_ERR(seq_zones_bitmap);
646 kfree(seq_zones_wlock);
647 goto err;
648 }
649 }
650 zone_bitmap_size = BITS_TO_LONGS(nr_zones) *
651 sizeof(unsigned long);
652 blk_mq_freeze_queue(q);
653 if (q->nr_zones != nr_zones) {
654 /* READ16/WRITE16 is mandatory for ZBC disks */
655 sdkp->device->use_16_for_rw = 1;
656 sdkp->device->use_10_for_rw = 0;
657
658 sdkp->zone_blocks = zone_blocks;
659 sdkp->zone_shift = zone_shift;
660 sdkp->nr_zones = nr_zones;
661 q->nr_zones = nr_zones;
662 swap(q->seq_zones_wlock, seq_zones_wlock);
663 swap(q->seq_zones_bitmap, seq_zones_bitmap);
664 } else if (memcmp(q->seq_zones_bitmap, seq_zones_bitmap,
665 zone_bitmap_size) != 0) {
666 memcpy(q->seq_zones_bitmap, seq_zones_bitmap,
667 zone_bitmap_size);
668 }
669 blk_mq_unfreeze_queue(q);
670 kfree(seq_zones_wlock);
671 kfree(seq_zones_bitmap);
672 }
673
674 return 0;
675
676err:
677 sd_zbc_cleanup(sdkp);
678 return ret;
679}
680
681int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
682{
683 int64_t zone_blocks;
684 int ret;
685
686 if (!sd_is_zoned(sdkp))
687 /*
688 * Device managed or normal SCSI disk,
689 * no special handling required
690 */
691 return 0;
692
693 /* Get zoned block device characteristics */
694 ret = sd_zbc_read_zoned_characteristics(sdkp, buf);
695 if (ret)
696 goto err;
697
698 /*
699 * Check for unconstrained reads: host-managed devices with
700 * constrained reads (drives failing read after write pointer)
701 * are not supported.
702 */
703 if (!sdkp->urswrz) {
704 if (sdkp->first_scan)
705 sd_printk(KERN_NOTICE, sdkp,
706 "constrained reads devices are not supported\n");
707 ret = -ENODEV;
708 goto err;
709 }
710
711 /* Check capacity */
712 ret = sd_zbc_check_capacity(sdkp, buf);
713 if (ret)
714 goto err;
715
716 /*
717 * Check zone size: only devices with a constant zone size (except
718 * an eventual last runt zone) that is a power of 2 are supported.
719 */
720 zone_blocks = sd_zbc_check_zone_size(sdkp);
721 ret = -EFBIG;
722 if (zone_blocks != (u32)zone_blocks)
723 goto err;
724 ret = zone_blocks;
725 if (ret < 0)
726 goto err;
727
728 /* The drive satisfies the kernel restrictions: set it up */
729 ret = sd_zbc_setup(sdkp, zone_blocks);
730 if (ret)
731 goto err;
732
733 return 0;
734
735err:
736 sdkp->capacity = 0;
737 sd_zbc_cleanup(sdkp);
738
739 return ret;
740}
741
742void sd_zbc_remove(struct scsi_disk *sdkp)
743{
744 sd_zbc_cleanup(sdkp);
745}
746
747void sd_zbc_print_zones(struct scsi_disk *sdkp)
748{
749 if (!sd_is_zoned(sdkp) || !sdkp->capacity)
750 return;
751
752 if (sdkp->capacity & (sdkp->zone_blocks - 1))
753 sd_printk(KERN_NOTICE, sdkp,
754 "%u zones of %u logical blocks + 1 runt zone\n",
755 sdkp->nr_zones - 1,
756 sdkp->zone_blocks);
757 else
758 sd_printk(KERN_NOTICE, sdkp,
759 "%u zones of %u logical blocks\n",
760 sdkp->nr_zones,
761 sdkp->zone_blocks);
762}