1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * SCSI Zoned Block commands
4  *
5  * Copyright (C) 2014-2015 SUSE Linux GmbH
6  * Written by: Hannes Reinecke <hare@suse.de>
7  * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
8  * Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
9  */
10 
11 #include <linux/blkdev.h>
12 #include <linux/vmalloc.h>
13 #include <linux/sched/mm.h>
14 #include <linux/mutex.h>
15 
16 #include <linux/unaligned.h>
17 
18 #include <scsi/scsi.h>
19 #include <scsi/scsi_cmnd.h>
20 
21 #include "sd.h"
22 
23 #define CREATE_TRACE_POINTS
24 #include "sd_trace.h"
25 
26 /* Whether or not a SCSI zone descriptor describes a gap zone. */
sd_zbc_is_gap_zone(const u8 buf[64])27 static bool sd_zbc_is_gap_zone(const u8 buf[64])
28 {
29 	return (buf[0] & 0xf) == ZBC_ZONE_TYPE_GAP;
30 }
31 
32 /**
33  * sd_zbc_parse_report - Parse a SCSI zone descriptor
34  * @sdkp: SCSI disk pointer.
35  * @buf: SCSI zone descriptor.
36  * @idx: Index of the zone relative to the first zone reported by the current
37  *	sd_zbc_report_zones() call.
38  * @cb: Callback function pointer.
39  * @data: Second argument passed to @cb.
40  *
41  * Return: Value returned by @cb.
42  *
43  * Convert a SCSI zone descriptor into struct blk_zone format. Additionally,
44  * call @cb(blk_zone, @data).
45  */
sd_zbc_parse_report(struct scsi_disk * sdkp,const u8 buf[64],unsigned int idx,report_zones_cb cb,void * data)46 static int sd_zbc_parse_report(struct scsi_disk *sdkp, const u8 buf[64],
47 			       unsigned int idx, report_zones_cb cb, void *data)
48 {
49 	struct scsi_device *sdp = sdkp->device;
50 	struct blk_zone zone = { 0 };
51 	sector_t start_lba, gran;
52 	int ret;
53 
54 	if (WARN_ON_ONCE(sd_zbc_is_gap_zone(buf)))
55 		return -EINVAL;
56 
57 	zone.type = buf[0] & 0x0f;
58 	zone.cond = (buf[1] >> 4) & 0xf;
59 	if (buf[1] & 0x01)
60 		zone.reset = 1;
61 	if (buf[1] & 0x02)
62 		zone.non_seq = 1;
63 
64 	start_lba = get_unaligned_be64(&buf[16]);
65 	zone.start = logical_to_sectors(sdp, start_lba);
66 	zone.capacity = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
67 	zone.len = zone.capacity;
68 	if (sdkp->zone_starting_lba_gran) {
69 		gran = logical_to_sectors(sdp, sdkp->zone_starting_lba_gran);
70 		if (zone.len > gran) {
71 			sd_printk(KERN_ERR, sdkp,
72 				  "Invalid zone at LBA %llu with capacity %llu and length %llu; granularity = %llu\n",
73 				  start_lba,
74 				  sectors_to_logical(sdp, zone.capacity),
75 				  sectors_to_logical(sdp, zone.len),
76 				  sectors_to_logical(sdp, gran));
77 			return -EINVAL;
78 		}
79 		/*
80 		 * Use the starting LBA granularity instead of the zone length
81 		 * obtained from the REPORT ZONES command.
82 		 */
83 		zone.len = gran;
84 	}
85 	if (zone.cond == ZBC_ZONE_COND_FULL)
86 		zone.wp = zone.start + zone.len;
87 	else
88 		zone.wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
89 
90 	ret = cb(&zone, idx, data);
91 	if (ret)
92 		return ret;
93 
94 	return 0;
95 }
96 
97 /**
98  * sd_zbc_do_report_zones - Issue a REPORT ZONES scsi command.
99  * @sdkp: The target disk
100  * @buf: vmalloc-ed buffer to use for the reply
101  * @buflen: the buffer size
102  * @lba: Start LBA of the report
103  * @partial: Do partial report
104  *
105  * For internal use during device validation.
106  * Using partial=true can significantly speed up execution of a report zones
107  * command because the disk does not have to count all possible report matching
108  * zones and will only report the count of zones fitting in the command reply
109  * buffer.
110  */
sd_zbc_do_report_zones(struct scsi_disk * sdkp,unsigned char * buf,unsigned int buflen,sector_t lba,bool partial)111 static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
112 				  unsigned int buflen, sector_t lba,
113 				  bool partial)
114 {
115 	struct scsi_device *sdp = sdkp->device;
116 	const int timeout = sdp->request_queue->rq_timeout;
117 	struct scsi_sense_hdr sshdr;
118 	const struct scsi_exec_args exec_args = {
119 		.sshdr = &sshdr,
120 	};
121 	unsigned char cmd[16];
122 	unsigned int rep_len;
123 	int result;
124 
125 	memset(cmd, 0, 16);
126 	cmd[0] = ZBC_IN;
127 	cmd[1] = ZI_REPORT_ZONES;
128 	put_unaligned_be64(lba, &cmd[2]);
129 	put_unaligned_be32(buflen, &cmd[10]);
130 	if (partial)
131 		cmd[14] = ZBC_REPORT_ZONE_PARTIAL;
132 
133 	result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buf, buflen,
134 				  timeout, SD_MAX_RETRIES, &exec_args);
135 	if (result) {
136 		sd_printk(KERN_ERR, sdkp,
137 			  "REPORT ZONES start lba %llu failed\n", lba);
138 		sd_print_result(sdkp, "REPORT ZONES", result);
139 		if (result > 0 && scsi_sense_valid(&sshdr))
140 			sd_print_sense_hdr(sdkp, &sshdr);
141 		return -EIO;
142 	}
143 
144 	rep_len = get_unaligned_be32(&buf[0]);
145 	if (rep_len < 64) {
146 		sd_printk(KERN_ERR, sdkp,
147 			  "REPORT ZONES report invalid length %u\n",
148 			  rep_len);
149 		return -EIO;
150 	}
151 
152 	return 0;
153 }
154 
155 /**
156  * sd_zbc_alloc_report_buffer() - Allocate a buffer for report zones reply.
157  * @sdkp: The target disk
158  * @nr_zones: Maximum number of zones to report
159  * @buflen: Size of the buffer allocated
160  *
161  * Try to allocate a reply buffer for the number of requested zones.
162  * The size of the buffer allocated may be smaller than requested to
163  * satify the device constraint (max_hw_sectors, max_segments, etc).
164  *
165  * Return the address of the allocated buffer and update @buflen with
166  * the size of the allocated buffer.
167  */
sd_zbc_alloc_report_buffer(struct scsi_disk * sdkp,unsigned int nr_zones,size_t * buflen)168 static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
169 					unsigned int nr_zones, size_t *buflen)
170 {
171 	struct request_queue *q = sdkp->disk->queue;
172 	size_t bufsize;
173 	void *buf;
174 
175 	/*
176 	 * Report zone buffer size should be at most 64B times the number of
177 	 * zones requested plus the 64B reply header, but should be aligned
178 	 * to SECTOR_SIZE for ATA devices.
179 	 * Make sure that this size does not exceed the hardware capabilities.
180 	 * Furthermore, since the report zone command cannot be split, make
181 	 * sure that the allocated buffer can always be mapped by limiting the
182 	 * number of pages allocated to the HBA max segments limit.
183 	 */
184 	nr_zones = min(nr_zones, sdkp->zone_info.nr_zones);
185 	bufsize = roundup((nr_zones + 1) * 64, SECTOR_SIZE);
186 	bufsize = min_t(size_t, bufsize,
187 			queue_max_hw_sectors(q) << SECTOR_SHIFT);
188 	bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
189 
190 	while (bufsize >= SECTOR_SIZE) {
191 		buf = kvzalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
192 		if (buf) {
193 			*buflen = bufsize;
194 			return buf;
195 		}
196 		bufsize = rounddown(bufsize >> 1, SECTOR_SIZE);
197 	}
198 
199 	return NULL;
200 }
201 
202 /**
203  * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
204  * @sdkp: The target disk
205  */
sd_zbc_zone_sectors(struct scsi_disk * sdkp)206 static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
207 {
208 	return logical_to_sectors(sdkp->device, sdkp->zone_info.zone_blocks);
209 }
210 
211 /**
212  * sd_zbc_report_zones - SCSI .report_zones() callback.
213  * @disk: Disk to report zones for.
214  * @sector: Start sector.
215  * @nr_zones: Maximum number of zones to report.
216  * @cb: Callback function called to report zone information.
217  * @data: Second argument passed to @cb.
218  *
219  * Called by the block layer to iterate over zone information. See also the
220  * disk->fops->report_zones() calls in block/blk-zoned.c.
221  */
sd_zbc_report_zones(struct gendisk * disk,sector_t sector,unsigned int nr_zones,report_zones_cb cb,void * data)222 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
223 			unsigned int nr_zones, report_zones_cb cb, void *data)
224 {
225 	struct scsi_disk *sdkp = scsi_disk(disk);
226 	sector_t lba = sectors_to_logical(sdkp->device, sector);
227 	unsigned int nr, i;
228 	unsigned char *buf;
229 	u64 zone_length, start_lba;
230 	size_t offset, buflen = 0;
231 	int zone_idx = 0;
232 	int ret;
233 
234 	if (sdkp->device->type != TYPE_ZBC)
235 		/* Not a zoned device */
236 		return -EOPNOTSUPP;
237 
238 	if (!sdkp->capacity)
239 		/* Device gone or invalid */
240 		return -ENODEV;
241 
242 	buf = sd_zbc_alloc_report_buffer(sdkp, nr_zones, &buflen);
243 	if (!buf)
244 		return -ENOMEM;
245 
246 	while (zone_idx < nr_zones && lba < sdkp->capacity) {
247 		ret = sd_zbc_do_report_zones(sdkp, buf, buflen, lba, true);
248 		if (ret)
249 			goto out;
250 
251 		offset = 0;
252 		nr = min(nr_zones, get_unaligned_be32(&buf[0]) / 64);
253 		if (!nr)
254 			break;
255 
256 		for (i = 0; i < nr && zone_idx < nr_zones; i++) {
257 			offset += 64;
258 			start_lba = get_unaligned_be64(&buf[offset + 16]);
259 			zone_length = get_unaligned_be64(&buf[offset + 8]);
260 			if ((zone_idx == 0 &&
261 			    (lba < start_lba ||
262 			     lba >= start_lba + zone_length)) ||
263 			    (zone_idx > 0 && start_lba != lba) ||
264 			    start_lba + zone_length < start_lba) {
265 				sd_printk(KERN_ERR, sdkp,
266 					  "Zone %d at LBA %llu is invalid: %llu + %llu\n",
267 					  zone_idx, lba, start_lba, zone_length);
268 				ret = -EINVAL;
269 				goto out;
270 			}
271 			lba = start_lba + zone_length;
272 			if (sd_zbc_is_gap_zone(&buf[offset])) {
273 				if (sdkp->zone_starting_lba_gran)
274 					continue;
275 				sd_printk(KERN_ERR, sdkp,
276 					  "Gap zone without constant LBA offsets\n");
277 				ret = -EINVAL;
278 				goto out;
279 			}
280 
281 			ret = sd_zbc_parse_report(sdkp, buf + offset, zone_idx,
282 						  cb, data);
283 			if (ret)
284 				goto out;
285 
286 			zone_idx++;
287 		}
288 	}
289 
290 	ret = zone_idx;
291 out:
292 	kvfree(buf);
293 	return ret;
294 }
295 
sd_zbc_cmnd_checks(struct scsi_cmnd * cmd)296 static blk_status_t sd_zbc_cmnd_checks(struct scsi_cmnd *cmd)
297 {
298 	struct request *rq = scsi_cmd_to_rq(cmd);
299 	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
300 	sector_t sector = blk_rq_pos(rq);
301 
302 	if (sdkp->device->type != TYPE_ZBC)
303 		/* Not a zoned device */
304 		return BLK_STS_IOERR;
305 
306 	if (sdkp->device->changed)
307 		return BLK_STS_IOERR;
308 
309 	if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
310 		/* Unaligned request */
311 		return BLK_STS_IOERR;
312 
313 	return BLK_STS_OK;
314 }
315 
316 /**
317  * sd_zbc_setup_zone_mgmt_cmnd - Prepare a zone ZBC_OUT command. The operations
318  *			can be RESET WRITE POINTER, OPEN, CLOSE or FINISH.
319  * @cmd: the command to setup
320  * @op: Operation to be performed
321  * @all: All zones control
322  *
323  * Called from sd_init_command() for REQ_OP_ZONE_RESET, REQ_OP_ZONE_RESET_ALL,
324  * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE or REQ_OP_ZONE_FINISH requests.
325  */
sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd * cmd,unsigned char op,bool all)326 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
327 					 unsigned char op, bool all)
328 {
329 	struct request *rq = scsi_cmd_to_rq(cmd);
330 	sector_t sector = blk_rq_pos(rq);
331 	struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
332 	sector_t block = sectors_to_logical(sdkp->device, sector);
333 	blk_status_t ret;
334 
335 	ret = sd_zbc_cmnd_checks(cmd);
336 	if (ret != BLK_STS_OK)
337 		return ret;
338 
339 	cmd->cmd_len = 16;
340 	memset(cmd->cmnd, 0, cmd->cmd_len);
341 	cmd->cmnd[0] = ZBC_OUT;
342 	cmd->cmnd[1] = op;
343 	if (all)
344 		cmd->cmnd[14] = 0x1;
345 	else
346 		put_unaligned_be64(block, &cmd->cmnd[2]);
347 
348 	rq->timeout = SD_TIMEOUT;
349 	cmd->sc_data_direction = DMA_NONE;
350 	cmd->transfersize = 0;
351 	cmd->allowed = 0;
352 
353 	return BLK_STS_OK;
354 }
355 
356 /**
357  * sd_zbc_complete - ZBC command post processing.
358  * @cmd: Completed command
359  * @good_bytes: Command reply bytes
360  * @sshdr: command sense header
361  *
362  * Called from sd_done() to handle zone commands errors and updates to the
363  * device queue zone write pointer offset cahce.
364  */
sd_zbc_complete(struct scsi_cmnd * cmd,unsigned int good_bytes,struct scsi_sense_hdr * sshdr)365 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
366 		     struct scsi_sense_hdr *sshdr)
367 {
368 	int result = cmd->result;
369 	struct request *rq = scsi_cmd_to_rq(cmd);
370 
371 	if (op_is_zone_mgmt(req_op(rq)) &&
372 	    result &&
373 	    sshdr->sense_key == ILLEGAL_REQUEST &&
374 	    sshdr->asc == 0x24) {
375 		/*
376 		 * INVALID FIELD IN CDB error: a zone management command was
377 		 * attempted on a conventional zone. Nothing to worry about,
378 		 * so be quiet about the error.
379 		 */
380 		rq->rq_flags |= RQF_QUIET;
381 	}
382 
383 	return good_bytes;
384 }
385 
386 /**
387  * sd_zbc_check_zoned_characteristics - Check zoned block device characteristics
388  * @sdkp: Target disk
389  * @buf: Buffer where to store the VPD page data
390  *
391  * Read VPD page B6, get information and check that reads are unconstrained.
392  */
sd_zbc_check_zoned_characteristics(struct scsi_disk * sdkp,unsigned char * buf)393 static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
394 					      unsigned char *buf)
395 {
396 	u64 zone_starting_lba_gran;
397 
398 	if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
399 		sd_printk(KERN_NOTICE, sdkp,
400 			  "Read zoned characteristics VPD page failed\n");
401 		return -ENODEV;
402 	}
403 
404 	if (sdkp->device->type != TYPE_ZBC) {
405 		/* Host-aware */
406 		sdkp->urswrz = 1;
407 		sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
408 		sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
409 		sdkp->zones_max_open = 0;
410 		return 0;
411 	}
412 
413 	/* Host-managed */
414 	sdkp->urswrz = buf[4] & 1;
415 	sdkp->zones_optimal_open = 0;
416 	sdkp->zones_optimal_nonseq = 0;
417 	sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
418 	/* Check zone alignment method */
419 	switch (buf[23] & 0xf) {
420 	case 0:
421 	case ZBC_CONSTANT_ZONE_LENGTH:
422 		/* Use zone length */
423 		break;
424 	case ZBC_CONSTANT_ZONE_START_OFFSET:
425 		zone_starting_lba_gran = get_unaligned_be64(&buf[24]);
426 		if (zone_starting_lba_gran == 0 ||
427 		    !is_power_of_2(zone_starting_lba_gran) ||
428 		    logical_to_sectors(sdkp->device, zone_starting_lba_gran) >
429 		    UINT_MAX) {
430 			sd_printk(KERN_ERR, sdkp,
431 				  "Invalid zone starting LBA granularity %llu\n",
432 				  zone_starting_lba_gran);
433 			return -ENODEV;
434 		}
435 		sdkp->zone_starting_lba_gran = zone_starting_lba_gran;
436 		break;
437 	default:
438 		sd_printk(KERN_ERR, sdkp, "Invalid zone alignment method\n");
439 		return -ENODEV;
440 	}
441 
442 	/*
443 	 * Check for unconstrained reads: host-managed devices with
444 	 * constrained reads (drives failing read after write pointer)
445 	 * are not supported.
446 	 */
447 	if (!sdkp->urswrz) {
448 		if (sdkp->first_scan)
449 			sd_printk(KERN_NOTICE, sdkp,
450 			  "constrained reads devices are not supported\n");
451 		return -ENODEV;
452 	}
453 
454 	return 0;
455 }
456 
457 /**
458  * sd_zbc_check_capacity - Check the device capacity
459  * @sdkp: Target disk
460  * @buf: command buffer
461  * @zblocks: zone size in logical blocks
462  *
463  * Get the device zone size and check that the device capacity as reported
464  * by READ CAPACITY matches the max_lba value (plus one) of the report zones
465  * command reply for devices with RC_BASIS == 0.
466  *
467  * Returns 0 upon success or an error code upon failure.
468  */
sd_zbc_check_capacity(struct scsi_disk * sdkp,unsigned char * buf,u32 * zblocks)469 static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf,
470 				 u32 *zblocks)
471 {
472 	u64 zone_blocks;
473 	sector_t max_lba;
474 	unsigned char *rec;
475 	int ret;
476 
477 	/* Do a report zone to get max_lba and the size of the first zone */
478 	ret = sd_zbc_do_report_zones(sdkp, buf, SD_BUF_SIZE, 0, false);
479 	if (ret)
480 		return ret;
481 
482 	if (sdkp->rc_basis == 0) {
483 		/* The max_lba field is the capacity of this device */
484 		max_lba = get_unaligned_be64(&buf[8]);
485 		if (sdkp->capacity != max_lba + 1) {
486 			if (sdkp->first_scan)
487 				sd_printk(KERN_WARNING, sdkp,
488 					"Changing capacity from %llu to max LBA+1 %llu\n",
489 					(unsigned long long)sdkp->capacity,
490 					(unsigned long long)max_lba + 1);
491 			sdkp->capacity = max_lba + 1;
492 		}
493 	}
494 
495 	if (sdkp->zone_starting_lba_gran == 0) {
496 		/* Get the size of the first reported zone */
497 		rec = buf + 64;
498 		zone_blocks = get_unaligned_be64(&rec[8]);
499 		if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
500 			if (sdkp->first_scan)
501 				sd_printk(KERN_NOTICE, sdkp,
502 					  "Zone size too large\n");
503 			return -EFBIG;
504 		}
505 	} else {
506 		zone_blocks = sdkp->zone_starting_lba_gran;
507 	}
508 
509 	if (!is_power_of_2(zone_blocks)) {
510 		sd_printk(KERN_ERR, sdkp,
511 			  "Zone size %llu is not a power of two.\n",
512 			  zone_blocks);
513 		return -EINVAL;
514 	}
515 
516 	*zblocks = zone_blocks;
517 
518 	return 0;
519 }
520 
sd_zbc_print_zones(struct scsi_disk * sdkp)521 static void sd_zbc_print_zones(struct scsi_disk *sdkp)
522 {
523 	if (sdkp->device->type != TYPE_ZBC || !sdkp->capacity)
524 		return;
525 
526 	if (sdkp->capacity & (sdkp->zone_info.zone_blocks - 1))
527 		sd_printk(KERN_NOTICE, sdkp,
528 			  "%u zones of %u logical blocks + 1 runt zone\n",
529 			  sdkp->zone_info.nr_zones - 1,
530 			  sdkp->zone_info.zone_blocks);
531 	else
532 		sd_printk(KERN_NOTICE, sdkp,
533 			  "%u zones of %u logical blocks\n",
534 			  sdkp->zone_info.nr_zones,
535 			  sdkp->zone_info.zone_blocks);
536 }
537 
538 /*
539  * Call blk_revalidate_disk_zones() if any of the zoned disk properties have
540  * changed that make it necessary to call that function. Called by
541  * sd_revalidate_disk() after the gendisk capacity has been set.
542  */
sd_zbc_revalidate_zones(struct scsi_disk * sdkp)543 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
544 {
545 	struct gendisk *disk = sdkp->disk;
546 	struct request_queue *q = disk->queue;
547 	u32 zone_blocks = sdkp->early_zone_info.zone_blocks;
548 	unsigned int nr_zones = sdkp->early_zone_info.nr_zones;
549 	unsigned int flags;
550 	int ret;
551 
552 	/*
553 	 * There is nothing to do for regular disks, including host-aware disks
554 	 * that have partitions.
555 	 */
556 	if (!blk_queue_is_zoned(q))
557 		return 0;
558 
559 	if (sdkp->zone_info.zone_blocks == zone_blocks &&
560 	    sdkp->zone_info.nr_zones == nr_zones &&
561 	    disk->nr_zones == nr_zones)
562 		return 0;
563 
564 	sdkp->zone_info.zone_blocks = zone_blocks;
565 	sdkp->zone_info.nr_zones = nr_zones;
566 
567 	flags = memalloc_noio_save();
568 	ret = blk_revalidate_disk_zones(disk);
569 	memalloc_noio_restore(flags);
570 	if (ret) {
571 		sdkp->zone_info = (struct zoned_disk_info){ };
572 		sdkp->capacity = 0;
573 		return ret;
574 	}
575 
576 	sd_zbc_print_zones(sdkp);
577 
578 	return 0;
579 }
580 
581 /**
582  * sd_zbc_read_zones - Read zone information and update the request queue
583  * @sdkp: SCSI disk pointer.
584  * @lim: queue limits to read into
585  * @buf: 512 byte buffer used for storing SCSI command output.
586  *
587  * Read zone information and update the request queue zone characteristics and
588  * also the zoned device information in *sdkp. Called by sd_revalidate_disk()
589  * before the gendisk capacity has been set.
590  */
sd_zbc_read_zones(struct scsi_disk * sdkp,struct queue_limits * lim,u8 buf[SD_BUF_SIZE])591 int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim,
592 		u8 buf[SD_BUF_SIZE])
593 {
594 	unsigned int nr_zones;
595 	u32 zone_blocks = 0;
596 	int ret;
597 
598 	if (sdkp->device->type != TYPE_ZBC)
599 		return 0;
600 
601 	lim->features |= BLK_FEAT_ZONED;
602 
603 	/*
604 	 * Per ZBC and ZAC specifications, writes in sequential write required
605 	 * zones of host-managed devices must be aligned to the device physical
606 	 * block size.
607 	 */
608 	lim->zone_write_granularity = sdkp->physical_block_size;
609 
610 	/* READ16/WRITE16/SYNC16 is mandatory for ZBC devices */
611 	sdkp->device->use_16_for_rw = 1;
612 	sdkp->device->use_10_for_rw = 0;
613 	sdkp->device->use_16_for_sync = 1;
614 
615 	/* Check zoned block device characteristics (unconstrained reads) */
616 	ret = sd_zbc_check_zoned_characteristics(sdkp, buf);
617 	if (ret)
618 		goto err;
619 
620 	/* Check the device capacity reported by report zones */
621 	ret = sd_zbc_check_capacity(sdkp, buf, &zone_blocks);
622 	if (ret != 0)
623 		goto err;
624 
625 	nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
626 	sdkp->early_zone_info.nr_zones = nr_zones;
627 	sdkp->early_zone_info.zone_blocks = zone_blocks;
628 
629 	/* The drive satisfies the kernel restrictions: set it up */
630 	if (sdkp->zones_max_open == U32_MAX)
631 		lim->max_open_zones = 0;
632 	else
633 		lim->max_open_zones = sdkp->zones_max_open;
634 	lim->max_active_zones = 0;
635 	lim->chunk_sectors = logical_to_sectors(sdkp->device, zone_blocks);
636 	/* Enable block layer zone append emulation */
637 	lim->max_zone_append_sectors = 0;
638 
639 	return 0;
640 
641 err:
642 	sdkp->capacity = 0;
643 
644 	return ret;
645 }
646