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89d94756 HR |
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 | #include <scsi/scsi_dbg.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_driver.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi_eh.h> | |
36 | ||
37 | #include "sd.h" | |
38 | #include "scsi_priv.h" | |
39 | ||
40 | enum zbc_zone_type { | |
41 | ZBC_ZONE_TYPE_CONV = 0x1, | |
42 | ZBC_ZONE_TYPE_SEQWRITE_REQ, | |
43 | ZBC_ZONE_TYPE_SEQWRITE_PREF, | |
44 | ZBC_ZONE_TYPE_RESERVED, | |
45 | }; | |
46 | ||
47 | enum zbc_zone_cond { | |
48 | ZBC_ZONE_COND_NO_WP, | |
49 | ZBC_ZONE_COND_EMPTY, | |
50 | ZBC_ZONE_COND_IMP_OPEN, | |
51 | ZBC_ZONE_COND_EXP_OPEN, | |
52 | ZBC_ZONE_COND_CLOSED, | |
53 | ZBC_ZONE_COND_READONLY = 0xd, | |
54 | ZBC_ZONE_COND_FULL, | |
55 | ZBC_ZONE_COND_OFFLINE, | |
56 | }; | |
57 | ||
58 | /** | |
59 | * Convert a zone descriptor to a zone struct. | |
60 | */ | |
61 | static void sd_zbc_parse_report(struct scsi_disk *sdkp, | |
62 | u8 *buf, | |
63 | struct blk_zone *zone) | |
64 | { | |
65 | struct scsi_device *sdp = sdkp->device; | |
66 | ||
67 | memset(zone, 0, sizeof(struct blk_zone)); | |
68 | ||
69 | zone->type = buf[0] & 0x0f; | |
70 | zone->cond = (buf[1] >> 4) & 0xf; | |
71 | if (buf[1] & 0x01) | |
72 | zone->reset = 1; | |
73 | if (buf[1] & 0x02) | |
74 | zone->non_seq = 1; | |
75 | ||
76 | zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8])); | |
77 | zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16])); | |
78 | zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24])); | |
79 | if (zone->type != ZBC_ZONE_TYPE_CONV && | |
80 | zone->cond == ZBC_ZONE_COND_FULL) | |
81 | zone->wp = zone->start + zone->len; | |
82 | } | |
83 | ||
84 | /** | |
85 | * Issue a REPORT ZONES scsi command. | |
86 | */ | |
87 | static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf, | |
88 | unsigned int buflen, sector_t lba) | |
89 | { | |
90 | struct scsi_device *sdp = sdkp->device; | |
91 | const int timeout = sdp->request_queue->rq_timeout; | |
92 | struct scsi_sense_hdr sshdr; | |
93 | unsigned char cmd[16]; | |
94 | unsigned int rep_len; | |
95 | int result; | |
96 | ||
97 | memset(cmd, 0, 16); | |
98 | cmd[0] = ZBC_IN; | |
99 | cmd[1] = ZI_REPORT_ZONES; | |
100 | put_unaligned_be64(lba, &cmd[2]); | |
101 | put_unaligned_be32(buflen, &cmd[10]); | |
102 | memset(buf, 0, buflen); | |
103 | ||
104 | result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, | |
105 | buf, buflen, &sshdr, | |
106 | timeout, SD_MAX_RETRIES, NULL); | |
107 | if (result) { | |
108 | sd_printk(KERN_ERR, sdkp, | |
109 | "REPORT ZONES lba %llu failed with %d/%d\n", | |
110 | (unsigned long long)lba, | |
111 | host_byte(result), driver_byte(result)); | |
112 | return -EIO; | |
113 | } | |
114 | ||
115 | rep_len = get_unaligned_be32(&buf[0]); | |
116 | if (rep_len < 64) { | |
117 | sd_printk(KERN_ERR, sdkp, | |
118 | "REPORT ZONES report invalid length %u\n", | |
119 | rep_len); | |
120 | return -EIO; | |
121 | } | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd) | |
127 | { | |
128 | struct request *rq = cmd->request; | |
129 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); | |
130 | sector_t lba, sector = blk_rq_pos(rq); | |
131 | unsigned int nr_bytes = blk_rq_bytes(rq); | |
132 | int ret; | |
133 | ||
134 | WARN_ON(nr_bytes == 0); | |
135 | ||
136 | if (!sd_is_zoned(sdkp)) | |
137 | /* Not a zoned device */ | |
138 | return BLKPREP_KILL; | |
139 | ||
140 | ret = scsi_init_io(cmd); | |
141 | if (ret != BLKPREP_OK) | |
142 | return ret; | |
143 | ||
144 | cmd->cmd_len = 16; | |
145 | memset(cmd->cmnd, 0, cmd->cmd_len); | |
146 | cmd->cmnd[0] = ZBC_IN; | |
147 | cmd->cmnd[1] = ZI_REPORT_ZONES; | |
148 | lba = sectors_to_logical(sdkp->device, sector); | |
149 | put_unaligned_be64(lba, &cmd->cmnd[2]); | |
150 | put_unaligned_be32(nr_bytes, &cmd->cmnd[10]); | |
151 | /* Do partial report for speeding things up */ | |
152 | cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL; | |
153 | ||
154 | cmd->sc_data_direction = DMA_FROM_DEVICE; | |
155 | cmd->sdb.length = nr_bytes; | |
156 | cmd->transfersize = sdkp->device->sector_size; | |
157 | cmd->allowed = 0; | |
158 | ||
159 | /* | |
160 | * Report may return less bytes than requested. Make sure | |
161 | * to report completion on the entire initial request. | |
162 | */ | |
163 | rq->__data_len = nr_bytes; | |
164 | ||
165 | return BLKPREP_OK; | |
166 | } | |
167 | ||
168 | static 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 | static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp) | |
224 | { | |
225 | return logical_to_sectors(sdkp->device, sdkp->zone_blocks); | |
226 | } | |
227 | ||
228 | static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp, | |
229 | sector_t sector) | |
230 | { | |
231 | return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift; | |
232 | } | |
233 | ||
234 | int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd) | |
235 | { | |
236 | struct request *rq = cmd->request; | |
237 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); | |
238 | sector_t sector = blk_rq_pos(rq); | |
239 | sector_t block = sectors_to_logical(sdkp->device, sector); | |
89d94756 HR |
240 | |
241 | if (!sd_is_zoned(sdkp)) | |
242 | /* Not a zoned device */ | |
243 | return BLKPREP_KILL; | |
244 | ||
245 | if (sdkp->device->changed) | |
246 | return BLKPREP_KILL; | |
247 | ||
248 | if (sector & (sd_zbc_zone_sectors(sdkp) - 1)) | |
249 | /* Unaligned request */ | |
250 | return BLKPREP_KILL; | |
251 | ||
89d94756 HR |
252 | cmd->cmd_len = 16; |
253 | memset(cmd->cmnd, 0, cmd->cmd_len); | |
254 | cmd->cmnd[0] = ZBC_OUT; | |
255 | cmd->cmnd[1] = ZO_RESET_WRITE_POINTER; | |
256 | put_unaligned_be64(block, &cmd->cmnd[2]); | |
257 | ||
258 | rq->timeout = SD_TIMEOUT; | |
259 | cmd->sc_data_direction = DMA_NONE; | |
260 | cmd->transfersize = 0; | |
261 | cmd->allowed = 0; | |
262 | ||
263 | return BLKPREP_OK; | |
264 | } | |
265 | ||
a90dfdc2 | 266 | int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd) |
89d94756 HR |
267 | { |
268 | struct request *rq = cmd->request; | |
269 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); | |
270 | sector_t sector = blk_rq_pos(rq); | |
271 | sector_t zone_sectors = sd_zbc_zone_sectors(sdkp); | |
272 | unsigned int zno = sd_zbc_zone_no(sdkp, sector); | |
273 | ||
274 | /* | |
275 | * Note: Checks of the alignment of the write command on | |
276 | * logical blocks is done in sd.c | |
277 | */ | |
278 | ||
279 | /* Do not allow zone boundaries crossing on host-managed drives */ | |
280 | if (blk_queue_zoned_model(sdkp->disk->queue) == BLK_ZONED_HM && | |
281 | (sector & (zone_sectors - 1)) + blk_rq_sectors(rq) > zone_sectors) | |
282 | return BLKPREP_KILL; | |
283 | ||
284 | /* | |
285 | * Do not issue more than one write at a time per | |
286 | * zone. This solves write ordering problems due to | |
287 | * the unlocking of the request queue in the dispatch | |
288 | * path in the non scsi-mq case. For scsi-mq, this | |
289 | * also avoids potential write reordering when multiple | |
290 | * threads running on different CPUs write to the same | |
291 | * zone (with a synchronized sequential pattern). | |
292 | */ | |
293 | if (sdkp->zones_wlock && | |
294 | test_and_set_bit(zno, sdkp->zones_wlock)) | |
295 | return BLKPREP_DEFER; | |
296 | ||
70e42fd0 DLM |
297 | WARN_ON_ONCE(cmd->flags & SCMD_ZONE_WRITE_LOCK); |
298 | cmd->flags |= SCMD_ZONE_WRITE_LOCK; | |
299 | ||
89d94756 HR |
300 | return BLKPREP_OK; |
301 | } | |
302 | ||
a90dfdc2 | 303 | void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) |
89d94756 | 304 | { |
a90dfdc2 | 305 | struct request *rq = cmd->request; |
89d94756 HR |
306 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
307 | ||
70e42fd0 | 308 | if (sdkp->zones_wlock && cmd->flags & SCMD_ZONE_WRITE_LOCK) { |
89d94756 HR |
309 | unsigned int zno = sd_zbc_zone_no(sdkp, blk_rq_pos(rq)); |
310 | WARN_ON_ONCE(!test_bit(zno, sdkp->zones_wlock)); | |
70e42fd0 | 311 | cmd->flags &= ~SCMD_ZONE_WRITE_LOCK; |
89d94756 HR |
312 | clear_bit_unlock(zno, sdkp->zones_wlock); |
313 | smp_mb__after_atomic(); | |
314 | } | |
315 | } | |
316 | ||
89d94756 HR |
317 | void sd_zbc_complete(struct scsi_cmnd *cmd, |
318 | unsigned int good_bytes, | |
319 | struct scsi_sense_hdr *sshdr) | |
320 | { | |
321 | int result = cmd->result; | |
322 | struct request *rq = cmd->request; | |
323 | ||
324 | switch (req_op(rq)) { | |
868ed5a5 DLM |
325 | case REQ_OP_ZONE_RESET: |
326 | ||
327 | if (result && | |
328 | sshdr->sense_key == ILLEGAL_REQUEST && | |
329 | sshdr->asc == 0x24) | |
330 | /* | |
331 | * INVALID FIELD IN CDB error: reset of a conventional | |
332 | * zone was attempted. Nothing to worry about, so be | |
333 | * quiet about the error. | |
334 | */ | |
335 | rq->rq_flags |= RQF_QUIET; | |
336 | break; | |
337 | ||
89d94756 | 338 | case REQ_OP_WRITE: |
02d26103 | 339 | case REQ_OP_WRITE_ZEROES: |
89d94756 | 340 | case REQ_OP_WRITE_SAME: |
89d94756 | 341 | |
868ed5a5 DLM |
342 | if (result && |
343 | sshdr->sense_key == ILLEGAL_REQUEST && | |
344 | sshdr->asc == 0x21) | |
89d94756 HR |
345 | /* |
346 | * INVALID ADDRESS FOR WRITE error: It is unlikely that | |
347 | * retrying write requests failed with any kind of | |
348 | * alignement error will result in success. So don't. | |
349 | */ | |
350 | cmd->allowed = 0; | |
89d94756 HR |
351 | break; |
352 | ||
353 | case REQ_OP_ZONE_REPORT: | |
354 | ||
355 | if (!result) | |
356 | sd_zbc_report_zones_complete(cmd, good_bytes); | |
357 | break; | |
358 | ||
359 | } | |
360 | } | |
361 | ||
362 | /** | |
363 | * Read zoned block device characteristics (VPD page B6). | |
364 | */ | |
365 | static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp, | |
366 | unsigned char *buf) | |
367 | { | |
368 | ||
369 | if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) { | |
370 | sd_printk(KERN_NOTICE, sdkp, | |
371 | "Unconstrained-read check failed\n"); | |
372 | return -ENODEV; | |
373 | } | |
374 | ||
375 | if (sdkp->device->type != TYPE_ZBC) { | |
376 | /* Host-aware */ | |
377 | sdkp->urswrz = 1; | |
378 | sdkp->zones_optimal_open = get_unaligned_be64(&buf[8]); | |
379 | sdkp->zones_optimal_nonseq = get_unaligned_be64(&buf[12]); | |
380 | sdkp->zones_max_open = 0; | |
381 | } else { | |
382 | /* Host-managed */ | |
383 | sdkp->urswrz = buf[4] & 1; | |
384 | sdkp->zones_optimal_open = 0; | |
385 | sdkp->zones_optimal_nonseq = 0; | |
386 | sdkp->zones_max_open = get_unaligned_be64(&buf[16]); | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | /** | |
393 | * Check reported capacity. | |
394 | */ | |
395 | static int sd_zbc_check_capacity(struct scsi_disk *sdkp, | |
396 | unsigned char *buf) | |
397 | { | |
398 | sector_t lba; | |
399 | int ret; | |
400 | ||
401 | if (sdkp->rc_basis != 0) | |
402 | return 0; | |
403 | ||
404 | /* Do a report zone to get the maximum LBA to check capacity */ | |
405 | ret = sd_zbc_report_zones(sdkp, buf, SD_BUF_SIZE, 0); | |
406 | if (ret) | |
407 | return ret; | |
408 | ||
409 | /* The max_lba field is the capacity of this device */ | |
410 | lba = get_unaligned_be64(&buf[8]); | |
411 | if (lba + 1 == sdkp->capacity) | |
412 | return 0; | |
413 | ||
414 | if (sdkp->first_scan) | |
415 | sd_printk(KERN_WARNING, sdkp, | |
416 | "Changing capacity from %llu to max LBA+1 %llu\n", | |
417 | (unsigned long long)sdkp->capacity, | |
418 | (unsigned long long)lba + 1); | |
419 | sdkp->capacity = lba + 1; | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | #define SD_ZBC_BUF_SIZE 131072 | |
425 | ||
426 | static int sd_zbc_check_zone_size(struct scsi_disk *sdkp) | |
427 | { | |
428 | u64 zone_blocks; | |
429 | sector_t block = 0; | |
430 | unsigned char *buf; | |
431 | unsigned char *rec; | |
432 | unsigned int buf_len; | |
433 | unsigned int list_length; | |
434 | int ret; | |
435 | u8 same; | |
436 | ||
437 | sdkp->zone_blocks = 0; | |
438 | ||
439 | /* Get a buffer */ | |
440 | buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL); | |
441 | if (!buf) | |
442 | return -ENOMEM; | |
443 | ||
444 | /* Do a report zone to get the same field */ | |
445 | ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0); | |
5f2808ff AB |
446 | if (ret) { |
447 | zone_blocks = 0; | |
89d94756 | 448 | goto out; |
5f2808ff | 449 | } |
89d94756 HR |
450 | |
451 | same = buf[4] & 0x0f; | |
452 | if (same > 0) { | |
453 | rec = &buf[64]; | |
454 | zone_blocks = get_unaligned_be64(&rec[8]); | |
455 | goto out; | |
456 | } | |
457 | ||
458 | /* | |
459 | * Check the size of all zones: all zones must be of | |
460 | * equal size, except the last zone which can be smaller | |
461 | * than other zones. | |
462 | */ | |
463 | do { | |
464 | ||
465 | /* Parse REPORT ZONES header */ | |
466 | list_length = get_unaligned_be32(&buf[0]) + 64; | |
467 | rec = buf + 64; | |
468 | if (list_length < SD_ZBC_BUF_SIZE) | |
469 | buf_len = list_length; | |
470 | else | |
471 | buf_len = SD_ZBC_BUF_SIZE; | |
472 | ||
473 | /* Parse zone descriptors */ | |
474 | while (rec < buf + buf_len) { | |
475 | zone_blocks = get_unaligned_be64(&rec[8]); | |
476 | if (sdkp->zone_blocks == 0) { | |
477 | sdkp->zone_blocks = zone_blocks; | |
478 | } else if (zone_blocks != sdkp->zone_blocks && | |
479 | (block + zone_blocks < sdkp->capacity | |
480 | || zone_blocks > sdkp->zone_blocks)) { | |
481 | zone_blocks = 0; | |
482 | goto out; | |
483 | } | |
484 | block += zone_blocks; | |
485 | rec += 64; | |
486 | } | |
487 | ||
488 | if (block < sdkp->capacity) { | |
489 | ret = sd_zbc_report_zones(sdkp, buf, | |
490 | SD_ZBC_BUF_SIZE, block); | |
491 | if (ret) | |
492 | return ret; | |
493 | } | |
494 | ||
495 | } while (block < sdkp->capacity); | |
496 | ||
497 | zone_blocks = sdkp->zone_blocks; | |
498 | ||
499 | out: | |
500 | kfree(buf); | |
501 | ||
502 | if (!zone_blocks) { | |
503 | if (sdkp->first_scan) | |
504 | sd_printk(KERN_NOTICE, sdkp, | |
505 | "Devices with non constant zone " | |
506 | "size are not supported\n"); | |
507 | return -ENODEV; | |
508 | } | |
509 | ||
510 | if (!is_power_of_2(zone_blocks)) { | |
511 | if (sdkp->first_scan) | |
512 | sd_printk(KERN_NOTICE, sdkp, | |
513 | "Devices with non power of 2 zone " | |
514 | "size are not supported\n"); | |
515 | return -ENODEV; | |
516 | } | |
517 | ||
518 | if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) { | |
519 | if (sdkp->first_scan) | |
520 | sd_printk(KERN_NOTICE, sdkp, | |
521 | "Zone size too large\n"); | |
522 | return -ENODEV; | |
523 | } | |
524 | ||
525 | sdkp->zone_blocks = zone_blocks; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int sd_zbc_setup(struct scsi_disk *sdkp) | |
531 | { | |
532 | ||
533 | /* chunk_sectors indicates the zone size */ | |
534 | blk_queue_chunk_sectors(sdkp->disk->queue, | |
535 | logical_to_sectors(sdkp->device, sdkp->zone_blocks)); | |
536 | sdkp->zone_shift = ilog2(sdkp->zone_blocks); | |
537 | sdkp->nr_zones = sdkp->capacity >> sdkp->zone_shift; | |
538 | if (sdkp->capacity & (sdkp->zone_blocks - 1)) | |
539 | sdkp->nr_zones++; | |
540 | ||
541 | if (!sdkp->zones_wlock) { | |
542 | sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones), | |
543 | sizeof(unsigned long), | |
544 | GFP_KERNEL); | |
545 | if (!sdkp->zones_wlock) | |
546 | return -ENOMEM; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | int sd_zbc_read_zones(struct scsi_disk *sdkp, | |
553 | unsigned char *buf) | |
554 | { | |
f7053240 | 555 | int ret; |
89d94756 HR |
556 | |
557 | if (!sd_is_zoned(sdkp)) | |
558 | /* | |
559 | * Device managed or normal SCSI disk, | |
560 | * no special handling required | |
561 | */ | |
562 | return 0; | |
563 | ||
564 | ||
565 | /* Get zoned block device characteristics */ | |
566 | ret = sd_zbc_read_zoned_characteristics(sdkp, buf); | |
567 | if (ret) | |
568 | goto err; | |
569 | ||
570 | /* | |
571 | * Check for unconstrained reads: host-managed devices with | |
572 | * constrained reads (drives failing read after write pointer) | |
573 | * are not supported. | |
574 | */ | |
575 | if (!sdkp->urswrz) { | |
576 | if (sdkp->first_scan) | |
577 | sd_printk(KERN_NOTICE, sdkp, | |
578 | "constrained reads devices are not supported\n"); | |
579 | ret = -ENODEV; | |
580 | goto err; | |
581 | } | |
582 | ||
583 | /* Check capacity */ | |
584 | ret = sd_zbc_check_capacity(sdkp, buf); | |
585 | if (ret) | |
586 | goto err; | |
89d94756 HR |
587 | |
588 | /* | |
589 | * Check zone size: only devices with a constant zone size (except | |
590 | * an eventual last runt zone) that is a power of 2 are supported. | |
591 | */ | |
592 | ret = sd_zbc_check_zone_size(sdkp); | |
593 | if (ret) | |
594 | goto err; | |
595 | ||
596 | /* The drive satisfies the kernel restrictions: set it up */ | |
597 | ret = sd_zbc_setup(sdkp); | |
598 | if (ret) | |
599 | goto err; | |
600 | ||
c6463c65 DLM |
601 | /* READ16/WRITE16 is mandatory for ZBC disks */ |
602 | sdkp->device->use_16_for_rw = 1; | |
603 | sdkp->device->use_10_for_rw = 0; | |
604 | ||
89d94756 HR |
605 | return 0; |
606 | ||
607 | err: | |
608 | sdkp->capacity = 0; | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
613 | void sd_zbc_remove(struct scsi_disk *sdkp) | |
614 | { | |
615 | kfree(sdkp->zones_wlock); | |
616 | sdkp->zones_wlock = NULL; | |
617 | } | |
618 | ||
619 | void sd_zbc_print_zones(struct scsi_disk *sdkp) | |
620 | { | |
621 | if (!sd_is_zoned(sdkp) || !sdkp->capacity) | |
622 | return; | |
623 | ||
624 | if (sdkp->capacity & (sdkp->zone_blocks - 1)) | |
625 | sd_printk(KERN_NOTICE, sdkp, | |
626 | "%u zones of %u logical blocks + 1 runt zone\n", | |
627 | sdkp->nr_zones - 1, | |
628 | sdkp->zone_blocks); | |
629 | else | |
630 | sd_printk(KERN_NOTICE, sdkp, | |
631 | "%u zones of %u logical blocks\n", | |
632 | sdkp->nr_zones, | |
633 | sdkp->zone_blocks); | |
634 | } |