[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/scsi/sd_zbc.c b/src/kernel/linux/v4.19/drivers/scsi/sd_zbc.c
new file mode 100644
index 0000000..412c178
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/scsi/sd_zbc.c
@@ -0,0 +1,747 @@
+/*
+ * SCSI Zoned Block commands
+ *
+ * Copyright (C) 2014-2015 SUSE Linux GmbH
+ * Written by: Hannes Reinecke <hare@suse.de>
+ * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
+ * Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ */
+
+#include <linux/blkdev.h>
+
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include "sd.h"
+
+/**
+ * sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
+ * @sdkp: The disk the report originated from
+ * @buf: Address of the report zone descriptor
+ * @zone: the destination zone structure
+ *
+ * All LBA sized values are converted to 512B sectors unit.
+ */
+static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
+ struct blk_zone *zone)
+{
+ struct scsi_device *sdp = sdkp->device;
+
+ memset(zone, 0, sizeof(struct blk_zone));
+
+ zone->type = buf[0] & 0x0f;
+ zone->cond = (buf[1] >> 4) & 0xf;
+ if (buf[1] & 0x01)
+ zone->reset = 1;
+ if (buf[1] & 0x02)
+ zone->non_seq = 1;
+
+ zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
+ zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16]));
+ zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
+ if (zone->type != ZBC_ZONE_TYPE_CONV &&
+ zone->cond == ZBC_ZONE_COND_FULL)
+ zone->wp = zone->start + zone->len;
+}
+
+/**
+ * sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
+ * @sdkp: The target disk
+ * @buf: Buffer to use for the reply
+ * @buflen: the buffer size
+ * @lba: Start LBA of the report
+ *
+ * For internal use during device validation.
+ */
+static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
+ unsigned int buflen, sector_t lba)
+{
+ struct scsi_device *sdp = sdkp->device;
+ const int timeout = sdp->request_queue->rq_timeout;
+ struct scsi_sense_hdr sshdr;
+ unsigned char cmd[16];
+ unsigned int rep_len;
+ int result;
+
+ memset(cmd, 0, 16);
+ cmd[0] = ZBC_IN;
+ cmd[1] = ZI_REPORT_ZONES;
+ put_unaligned_be64(lba, &cmd[2]);
+ put_unaligned_be32(buflen, &cmd[10]);
+ memset(buf, 0, buflen);
+
+ result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+ buf, buflen, &sshdr,
+ timeout, SD_MAX_RETRIES, NULL);
+ if (result) {
+ sd_printk(KERN_ERR, sdkp,
+ "REPORT ZONES lba %llu failed with %d/%d\n",
+ (unsigned long long)lba,
+ host_byte(result), driver_byte(result));
+ return -EIO;
+ }
+
+ rep_len = get_unaligned_be32(&buf[0]);
+ if (rep_len < 64) {
+ sd_printk(KERN_ERR, sdkp,
+ "REPORT ZONES report invalid length %u\n",
+ rep_len);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
+ * @cmd: The command to setup
+ *
+ * Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
+ */
+int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+ struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+ sector_t lba, sector = blk_rq_pos(rq);
+ unsigned int nr_bytes = blk_rq_bytes(rq);
+ int ret;
+
+ WARN_ON(nr_bytes == 0);
+
+ if (!sd_is_zoned(sdkp))
+ /* Not a zoned device */
+ return BLKPREP_KILL;
+
+ ret = scsi_init_io(cmd);
+ if (ret != BLKPREP_OK)
+ return ret;
+
+ cmd->cmd_len = 16;
+ memset(cmd->cmnd, 0, cmd->cmd_len);
+ cmd->cmnd[0] = ZBC_IN;
+ cmd->cmnd[1] = ZI_REPORT_ZONES;
+ lba = sectors_to_logical(sdkp->device, sector);
+ put_unaligned_be64(lba, &cmd->cmnd[2]);
+ put_unaligned_be32(nr_bytes, &cmd->cmnd[10]);
+ /* Do partial report for speeding things up */
+ cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL;
+
+ cmd->sc_data_direction = DMA_FROM_DEVICE;
+ cmd->sdb.length = nr_bytes;
+ cmd->transfersize = sdkp->device->sector_size;
+ cmd->allowed = 0;
+
+ return BLKPREP_OK;
+}
+
+/**
+ * sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
+ * @scmd: The completed report zones command
+ * @good_bytes: reply size in bytes
+ *
+ * Convert all reported zone descriptors to struct blk_zone. The conversion
+ * is done in-place, directly in the request specified sg buffer.
+ */
+static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
+ unsigned int good_bytes)
+{
+ struct request *rq = scmd->request;
+ struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+ struct sg_mapping_iter miter;
+ struct blk_zone_report_hdr hdr;
+ struct blk_zone zone;
+ unsigned int offset, bytes = 0;
+ unsigned long flags;
+ u8 *buf;
+
+ if (good_bytes < 64)
+ return;
+
+ memset(&hdr, 0, sizeof(struct blk_zone_report_hdr));
+
+ sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
+ SG_MITER_TO_SG | SG_MITER_ATOMIC);
+
+ local_irq_save(flags);
+ while (sg_miter_next(&miter) && bytes < good_bytes) {
+
+ buf = miter.addr;
+ offset = 0;
+
+ if (bytes == 0) {
+ /* Set the report header */
+ hdr.nr_zones = min_t(unsigned int,
+ (good_bytes - 64) / 64,
+ get_unaligned_be32(&buf[0]) / 64);
+ memcpy(buf, &hdr, sizeof(struct blk_zone_report_hdr));
+ offset += 64;
+ bytes += 64;
+ }
+
+ /* Parse zone descriptors */
+ while (offset < miter.length && hdr.nr_zones) {
+ WARN_ON(offset > miter.length);
+ buf = miter.addr + offset;
+ sd_zbc_parse_report(sdkp, buf, &zone);
+ memcpy(buf, &zone, sizeof(struct blk_zone));
+ offset += 64;
+ bytes += 64;
+ hdr.nr_zones--;
+ }
+
+ if (!hdr.nr_zones)
+ break;
+
+ }
+ sg_miter_stop(&miter);
+ local_irq_restore(flags);
+}
+
+/**
+ * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
+ * @sdkp: The target disk
+ */
+static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
+{
+ return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
+}
+
+/**
+ * sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
+ * @cmd: the command to setup
+ *
+ * Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
+ */
+int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+ struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+ sector_t sector = blk_rq_pos(rq);
+ sector_t block = sectors_to_logical(sdkp->device, sector);
+
+ if (!sd_is_zoned(sdkp))
+ /* Not a zoned device */
+ return BLKPREP_KILL;
+
+ if (sdkp->device->changed)
+ return BLKPREP_KILL;
+
+ if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
+ /* Unaligned request */
+ return BLKPREP_KILL;
+
+ cmd->cmd_len = 16;
+ memset(cmd->cmnd, 0, cmd->cmd_len);
+ cmd->cmnd[0] = ZBC_OUT;
+ cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
+ put_unaligned_be64(block, &cmd->cmnd[2]);
+
+ rq->timeout = SD_TIMEOUT;
+ cmd->sc_data_direction = DMA_NONE;
+ cmd->transfersize = 0;
+ cmd->allowed = 0;
+
+ return BLKPREP_OK;
+}
+
+/**
+ * sd_zbc_complete - ZBC command post processing.
+ * @cmd: Completed command
+ * @good_bytes: Command reply bytes
+ * @sshdr: command sense header
+ *
+ * Called from sd_done(). Process report zones reply and handle reset zone
+ * and write commands errors.
+ */
+void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
+ struct scsi_sense_hdr *sshdr)
+{
+ int result = cmd->result;
+ struct request *rq = cmd->request;
+
+ switch (req_op(rq)) {
+ case REQ_OP_ZONE_RESET:
+
+ if (result &&
+ sshdr->sense_key == ILLEGAL_REQUEST &&
+ sshdr->asc == 0x24)
+ /*
+ * INVALID FIELD IN CDB error: reset of a conventional
+ * zone was attempted. Nothing to worry about, so be
+ * quiet about the error.
+ */
+ rq->rq_flags |= RQF_QUIET;
+ break;
+
+ case REQ_OP_WRITE:
+ case REQ_OP_WRITE_ZEROES:
+ case REQ_OP_WRITE_SAME:
+ break;
+
+ case REQ_OP_ZONE_REPORT:
+
+ if (!result)
+ sd_zbc_report_zones_complete(cmd, good_bytes);
+ break;
+
+ }
+}
+
+/**
+ * sd_zbc_read_zoned_characteristics - Read zoned block device characteristics
+ * @sdkp: Target disk
+ * @buf: Buffer where to store the VPD page data
+ *
+ * Read VPD page B6.
+ */
+static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
+ unsigned char *buf)
+{
+
+ if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
+ sd_printk(KERN_NOTICE, sdkp,
+ "Unconstrained-read check failed\n");
+ return -ENODEV;
+ }
+
+ if (sdkp->device->type != TYPE_ZBC) {
+ /* Host-aware */
+ sdkp->urswrz = 1;
+ sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
+ sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
+ sdkp->zones_max_open = 0;
+ } else {
+ /* Host-managed */
+ sdkp->urswrz = buf[4] & 1;
+ sdkp->zones_optimal_open = 0;
+ sdkp->zones_optimal_nonseq = 0;
+ sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
+ }
+
+ return 0;
+}
+
+/**
+ * sd_zbc_check_capacity - Check reported capacity.
+ * @sdkp: Target disk
+ * @buf: Buffer to use for commands
+ *
+ * ZBC drive may report only the capacity of the first conventional zones at
+ * LBA 0. This is indicated by the RC_BASIS field of the read capacity reply.
+ * Check this here. If the disk reported only its conventional zones capacity,
+ * get the total capacity by doing a report zones.
+ */
+static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
+{
+ sector_t lba;
+ int ret;
+
+ if (sdkp->rc_basis != 0)
+ return 0;
+
+ /* Do a report zone to get the maximum LBA to check capacity */
+ ret = sd_zbc_report_zones(sdkp, buf, SD_BUF_SIZE, 0);
+ if (ret)
+ return ret;
+
+ /* The max_lba field is the capacity of this device */
+ lba = get_unaligned_be64(&buf[8]);
+ if (lba + 1 == sdkp->capacity)
+ return 0;
+
+ if (sdkp->first_scan)
+ sd_printk(KERN_WARNING, sdkp,
+ "Changing capacity from %llu to max LBA+1 %llu\n",
+ (unsigned long long)sdkp->capacity,
+ (unsigned long long)lba + 1);
+ sdkp->capacity = lba + 1;
+
+ return 0;
+}
+
+#define SD_ZBC_BUF_SIZE 131072U
+
+/**
+ * sd_zbc_check_zone_size - Check the device zone sizes
+ * @sdkp: Target disk
+ *
+ * Check that all zones of the device are equal. The last zone can however
+ * be smaller. The zone size must also be a power of two number of LBAs.
+ *
+ * Returns the zone size in number of blocks upon success or an error code
+ * upon failure.
+ */
+static s64 sd_zbc_check_zone_size(struct scsi_disk *sdkp)
+{
+ u64 zone_blocks = 0;
+ sector_t block = 0;
+ unsigned char *buf;
+ unsigned char *rec;
+ unsigned int buf_len;
+ unsigned int list_length;
+ s64 ret;
+ u8 same;
+
+ /* Get a buffer */
+ buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /* Do a report zone to get the same field */
+ ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0);
+ if (ret)
+ goto out_free;
+
+ same = buf[4] & 0x0f;
+ if (same > 0) {
+ rec = &buf[64];
+ zone_blocks = get_unaligned_be64(&rec[8]);
+ goto out;
+ }
+
+ /*
+ * Check the size of all zones: all zones must be of
+ * equal size, except the last zone which can be smaller
+ * than other zones.
+ */
+ do {
+
+ /* Parse REPORT ZONES header */
+ list_length = get_unaligned_be32(&buf[0]) + 64;
+ rec = buf + 64;
+ buf_len = min(list_length, SD_ZBC_BUF_SIZE);
+
+ /* Parse zone descriptors */
+ while (rec < buf + buf_len) {
+ u64 this_zone_blocks = get_unaligned_be64(&rec[8]);
+
+ if (zone_blocks == 0) {
+ zone_blocks = this_zone_blocks;
+ } else if (this_zone_blocks != zone_blocks &&
+ (block + this_zone_blocks < sdkp->capacity
+ || this_zone_blocks > zone_blocks)) {
+ zone_blocks = 0;
+ goto out;
+ }
+ block += this_zone_blocks;
+ rec += 64;
+ }
+
+ if (block < sdkp->capacity) {
+ ret = sd_zbc_report_zones(sdkp, buf,
+ SD_ZBC_BUF_SIZE, block);
+ if (ret)
+ goto out_free;
+ }
+
+ } while (block < sdkp->capacity);
+
+out:
+ if (!zone_blocks) {
+ if (sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "Devices with non constant zone "
+ "size are not supported\n");
+ ret = -ENODEV;
+ } else if (!is_power_of_2(zone_blocks)) {
+ if (sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "Devices with non power of 2 zone "
+ "size are not supported\n");
+ ret = -ENODEV;
+ } else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
+ if (sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "Zone size too large\n");
+ ret = -ENODEV;
+ } else {
+ ret = zone_blocks;
+ }
+
+out_free:
+ kfree(buf);
+
+ return ret;
+}
+
+/**
+ * sd_zbc_alloc_zone_bitmap - Allocate a zone bitmap (one bit per zone).
+ * @nr_zones: Number of zones to allocate space for.
+ * @numa_node: NUMA node to allocate the memory from.
+ */
+static inline unsigned long *
+sd_zbc_alloc_zone_bitmap(u32 nr_zones, int numa_node)
+{
+ return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
+ GFP_KERNEL, numa_node);
+}
+
+/**
+ * sd_zbc_get_seq_zones - Parse report zones reply to identify sequential zones
+ * @sdkp: disk used
+ * @buf: report reply buffer
+ * @buflen: length of @buf
+ * @zone_shift: logarithm base 2 of the number of blocks in a zone
+ * @seq_zones_bitmap: bitmap of sequential zones to set
+ *
+ * Parse reported zone descriptors in @buf to identify sequential zones and
+ * set the reported zone bit in @seq_zones_bitmap accordingly.
+ * Since read-only and offline zones cannot be written, do not
+ * mark them as sequential in the bitmap.
+ * Return the LBA after the last zone reported.
+ */
+static sector_t sd_zbc_get_seq_zones(struct scsi_disk *sdkp, unsigned char *buf,
+ unsigned int buflen, u32 zone_shift,
+ unsigned long *seq_zones_bitmap)
+{
+ sector_t lba, next_lba = sdkp->capacity;
+ unsigned int buf_len, list_length;
+ unsigned char *rec;
+ u8 type, cond;
+
+ list_length = get_unaligned_be32(&buf[0]) + 64;
+ buf_len = min(list_length, buflen);
+ rec = buf + 64;
+
+ while (rec < buf + buf_len) {
+ type = rec[0] & 0x0f;
+ cond = (rec[1] >> 4) & 0xf;
+ lba = get_unaligned_be64(&rec[16]);
+ if (type != ZBC_ZONE_TYPE_CONV &&
+ cond != ZBC_ZONE_COND_READONLY &&
+ cond != ZBC_ZONE_COND_OFFLINE)
+ set_bit(lba >> zone_shift, seq_zones_bitmap);
+ next_lba = lba + get_unaligned_be64(&rec[8]);
+ rec += 64;
+ }
+
+ return next_lba;
+}
+
+/**
+ * sd_zbc_setup_seq_zones_bitmap - Initialize a seq zone bitmap.
+ * @sdkp: target disk
+ * @zone_shift: logarithm base 2 of the number of blocks in a zone
+ * @nr_zones: number of zones to set up a seq zone bitmap for
+ *
+ * Allocate a zone bitmap and initialize it by identifying sequential zones.
+ */
+static unsigned long *
+sd_zbc_setup_seq_zones_bitmap(struct scsi_disk *sdkp, u32 zone_shift,
+ u32 nr_zones)
+{
+ struct request_queue *q = sdkp->disk->queue;
+ unsigned long *seq_zones_bitmap;
+ sector_t lba = 0;
+ unsigned char *buf;
+ int ret = -ENOMEM;
+
+ seq_zones_bitmap = sd_zbc_alloc_zone_bitmap(nr_zones, q->node);
+ if (!seq_zones_bitmap)
+ return ERR_PTR(-ENOMEM);
+
+ buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
+ if (!buf)
+ goto out;
+
+ while (lba < sdkp->capacity) {
+ ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba);
+ if (ret)
+ goto out;
+ lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
+ zone_shift, seq_zones_bitmap);
+ }
+
+ if (lba != sdkp->capacity) {
+ /* Something went wrong */
+ ret = -EIO;
+ }
+
+out:
+ kfree(buf);
+ if (ret) {
+ kfree(seq_zones_bitmap);
+ return ERR_PTR(ret);
+ }
+ return seq_zones_bitmap;
+}
+
+static void sd_zbc_cleanup(struct scsi_disk *sdkp)
+{
+ struct request_queue *q = sdkp->disk->queue;
+
+ kfree(q->seq_zones_bitmap);
+ q->seq_zones_bitmap = NULL;
+
+ kfree(q->seq_zones_wlock);
+ q->seq_zones_wlock = NULL;
+
+ q->nr_zones = 0;
+}
+
+static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)
+{
+ struct request_queue *q = sdkp->disk->queue;
+ u32 zone_shift = ilog2(zone_blocks);
+ u32 nr_zones;
+ int ret;
+
+ /* chunk_sectors indicates the zone size */
+ blk_queue_chunk_sectors(q,
+ logical_to_sectors(sdkp->device, zone_blocks));
+ nr_zones = round_up(sdkp->capacity, zone_blocks) >> zone_shift;
+
+ /*
+ * Initialize the device request queue information if the number
+ * of zones changed.
+ */
+ if (nr_zones != sdkp->nr_zones || nr_zones != q->nr_zones) {
+ unsigned long *seq_zones_wlock = NULL, *seq_zones_bitmap = NULL;
+ size_t zone_bitmap_size;
+
+ if (nr_zones) {
+ seq_zones_wlock = sd_zbc_alloc_zone_bitmap(nr_zones,
+ q->node);
+ if (!seq_zones_wlock) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ seq_zones_bitmap = sd_zbc_setup_seq_zones_bitmap(sdkp,
+ zone_shift, nr_zones);
+ if (IS_ERR(seq_zones_bitmap)) {
+ ret = PTR_ERR(seq_zones_bitmap);
+ kfree(seq_zones_wlock);
+ goto err;
+ }
+ }
+ zone_bitmap_size = BITS_TO_LONGS(nr_zones) *
+ sizeof(unsigned long);
+ blk_mq_freeze_queue(q);
+ if (q->nr_zones != nr_zones) {
+ /* READ16/WRITE16 is mandatory for ZBC disks */
+ sdkp->device->use_16_for_rw = 1;
+ sdkp->device->use_10_for_rw = 0;
+
+ sdkp->zone_blocks = zone_blocks;
+ sdkp->zone_shift = zone_shift;
+ sdkp->nr_zones = nr_zones;
+ q->nr_zones = nr_zones;
+ swap(q->seq_zones_wlock, seq_zones_wlock);
+ swap(q->seq_zones_bitmap, seq_zones_bitmap);
+ } else if (memcmp(q->seq_zones_bitmap, seq_zones_bitmap,
+ zone_bitmap_size) != 0) {
+ memcpy(q->seq_zones_bitmap, seq_zones_bitmap,
+ zone_bitmap_size);
+ }
+ blk_mq_unfreeze_queue(q);
+ kfree(seq_zones_wlock);
+ kfree(seq_zones_bitmap);
+ }
+
+ return 0;
+
+err:
+ sd_zbc_cleanup(sdkp);
+ return ret;
+}
+
+int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
+{
+ int64_t zone_blocks;
+ int ret;
+
+ if (!sd_is_zoned(sdkp))
+ /*
+ * Device managed or normal SCSI disk,
+ * no special handling required
+ */
+ return 0;
+
+ /* Get zoned block device characteristics */
+ ret = sd_zbc_read_zoned_characteristics(sdkp, buf);
+ if (ret)
+ goto err;
+
+ /*
+ * Check for unconstrained reads: host-managed devices with
+ * constrained reads (drives failing read after write pointer)
+ * are not supported.
+ */
+ if (!sdkp->urswrz) {
+ if (sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "constrained reads devices are not supported\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ /* Check capacity */
+ ret = sd_zbc_check_capacity(sdkp, buf);
+ if (ret)
+ goto err;
+
+ /*
+ * Check zone size: only devices with a constant zone size (except
+ * an eventual last runt zone) that is a power of 2 are supported.
+ */
+ zone_blocks = sd_zbc_check_zone_size(sdkp);
+ ret = -EFBIG;
+ if (zone_blocks != (u32)zone_blocks)
+ goto err;
+ ret = zone_blocks;
+ if (ret < 0)
+ goto err;
+
+ /* The drive satisfies the kernel restrictions: set it up */
+ ret = sd_zbc_setup(sdkp, zone_blocks);
+ if (ret)
+ goto err;
+
+ return 0;
+
+err:
+ sdkp->capacity = 0;
+ sd_zbc_cleanup(sdkp);
+
+ return ret;
+}
+
+void sd_zbc_remove(struct scsi_disk *sdkp)
+{
+ sd_zbc_cleanup(sdkp);
+}
+
+void sd_zbc_print_zones(struct scsi_disk *sdkp)
+{
+ if (!sd_is_zoned(sdkp) || !sdkp->capacity)
+ return;
+
+ if (sdkp->capacity & (sdkp->zone_blocks - 1))
+ sd_printk(KERN_NOTICE, sdkp,
+ "%u zones of %u logical blocks + 1 runt zone\n",
+ sdkp->nr_zones - 1,
+ sdkp->zone_blocks);
+ else
+ sd_printk(KERN_NOTICE, sdkp,
+ "%u zones of %u logical blocks\n",
+ sdkp->nr_zones,
+ sdkp->zone_blocks);
+}