mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 14:43:03 +00:00
ad512f2023
Implement REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH support to allow explicit control of zone states. Contains contributions from Matias Bjorling, Hans Holmberg, Keith Busch and Damien Le Moal. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ajay Joshi <ajay.joshi@wdc.com> Signed-off-by: Matias Bjorling <matias.bjorling@wdc.com> Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
544 lines
14 KiB
C
544 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/sched/mm.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_do_report_zones - Issue a REPORT ZONES scsi command.
|
|
* @sdkp: The target disk
|
|
* @buf: vmalloc-ed buffer to use for the reply
|
|
* @buflen: the buffer size
|
|
* @lba: Start LBA of the report
|
|
* @partial: Do partial report
|
|
*
|
|
* For internal use during device validation.
|
|
* Using partial=true can significantly speed up execution of a report zones
|
|
* command because the disk does not have to count all possible report matching
|
|
* zones and will only report the count of zones fitting in the command reply
|
|
* buffer.
|
|
*/
|
|
static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
|
|
unsigned int buflen, sector_t lba,
|
|
bool partial)
|
|
{
|
|
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]);
|
|
if (partial)
|
|
cmd[14] = ZBC_REPORT_ZONE_PARTIAL;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Maximum number of zones to get with one report zones command.
|
|
*/
|
|
#define SD_ZBC_REPORT_MAX_ZONES 8192U
|
|
|
|
/**
|
|
* Allocate a buffer for report zones reply.
|
|
* @sdkp: The target disk
|
|
* @nr_zones: Maximum number of zones to report
|
|
* @buflen: Size of the buffer allocated
|
|
*
|
|
* Try to allocate a reply buffer for the number of requested zones.
|
|
* The size of the buffer allocated may be smaller than requested to
|
|
* satify the device constraint (max_hw_sectors, max_segments, etc).
|
|
*
|
|
* Return the address of the allocated buffer and update @buflen with
|
|
* the size of the allocated buffer.
|
|
*/
|
|
static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
|
|
unsigned int nr_zones, size_t *buflen)
|
|
{
|
|
struct request_queue *q = sdkp->disk->queue;
|
|
size_t bufsize;
|
|
void *buf;
|
|
|
|
/*
|
|
* Report zone buffer size should be at most 64B times the number of
|
|
* zones requested plus the 64B reply header, but should be at least
|
|
* SECTOR_SIZE for ATA devices.
|
|
* Make sure that this size does not exceed the hardware capabilities.
|
|
* Furthermore, since the report zone command cannot be split, make
|
|
* sure that the allocated buffer can always be mapped by limiting the
|
|
* number of pages allocated to the HBA max segments limit.
|
|
*/
|
|
nr_zones = min(nr_zones, SD_ZBC_REPORT_MAX_ZONES);
|
|
bufsize = roundup((nr_zones + 1) * 64, 512);
|
|
bufsize = min_t(size_t, bufsize,
|
|
queue_max_hw_sectors(q) << SECTOR_SHIFT);
|
|
bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
|
|
|
|
buf = vzalloc(bufsize);
|
|
if (buf)
|
|
*buflen = bufsize;
|
|
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_report_zones - Disk report zones operation.
|
|
* @disk: The target disk
|
|
* @sector: Start 512B sector of the report
|
|
* @zones: Array of zone descriptors
|
|
* @nr_zones: Number of descriptors in the array
|
|
*
|
|
* Execute a report zones command on the target disk.
|
|
*/
|
|
int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
|
|
struct blk_zone *zones, unsigned int *nr_zones)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(disk);
|
|
unsigned int i, nrz = *nr_zones;
|
|
unsigned char *buf;
|
|
size_t buflen = 0, offset = 0;
|
|
int ret = 0;
|
|
|
|
if (!sd_is_zoned(sdkp))
|
|
/* Not a zoned device */
|
|
return -EOPNOTSUPP;
|
|
|
|
buf = sd_zbc_alloc_report_buffer(sdkp, nrz, &buflen);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ret = sd_zbc_do_report_zones(sdkp, buf, buflen,
|
|
sectors_to_logical(sdkp->device, sector), true);
|
|
if (ret)
|
|
goto out;
|
|
|
|
nrz = min(nrz, get_unaligned_be32(&buf[0]) / 64);
|
|
for (i = 0; i < nrz; i++) {
|
|
offset += 64;
|
|
sd_zbc_parse_report(sdkp, buf + offset, zones);
|
|
zones++;
|
|
}
|
|
|
|
*nr_zones = nrz;
|
|
|
|
out:
|
|
kvfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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_zone_mgmt_cmnd - Prepare a zone ZBC_OUT command. The operations
|
|
* can be RESET WRITE POINTER, OPEN, CLOSE or FINISH.
|
|
* @cmd: the command to setup
|
|
* @op: Operation to be performed
|
|
* @all: All zones control
|
|
*
|
|
* Called from sd_init_command() for REQ_OP_ZONE_RESET, REQ_OP_ZONE_RESET_ALL,
|
|
* REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE or REQ_OP_ZONE_FINISH requests.
|
|
*/
|
|
blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
|
|
unsigned char op, bool all)
|
|
{
|
|
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 BLK_STS_IOERR;
|
|
|
|
if (sdkp->device->changed)
|
|
return BLK_STS_IOERR;
|
|
|
|
if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
|
|
/* Unaligned request */
|
|
return BLK_STS_IOERR;
|
|
|
|
cmd->cmd_len = 16;
|
|
memset(cmd->cmnd, 0, cmd->cmd_len);
|
|
cmd->cmnd[0] = ZBC_OUT;
|
|
cmd->cmnd[1] = op;
|
|
if (all)
|
|
cmd->cmnd[14] = 0x1;
|
|
else
|
|
put_unaligned_be64(block, &cmd->cmnd[2]);
|
|
|
|
rq->timeout = SD_TIMEOUT;
|
|
cmd->sc_data_direction = DMA_NONE;
|
|
cmd->transfersize = 0;
|
|
cmd->allowed = 0;
|
|
|
|
return BLK_STS_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;
|
|
|
|
if (op_is_zone_mgmt(req_op(rq)) &&
|
|
result &&
|
|
sshdr->sense_key == ILLEGAL_REQUEST &&
|
|
sshdr->asc == 0x24) {
|
|
/*
|
|
* INVALID FIELD IN CDB error: a zone management command was
|
|
* attempted on a conventional zone. Nothing to worry about,
|
|
* so be quiet about the error.
|
|
*/
|
|
rq->rq_flags |= RQF_QUIET;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_check_zoned_characteristics - Check zoned block device characteristics
|
|
* @sdkp: Target disk
|
|
* @buf: Buffer where to store the VPD page data
|
|
*
|
|
* Read VPD page B6, get information and check that reads are unconstrained.
|
|
*/
|
|
static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
|
|
unsigned char *buf)
|
|
{
|
|
|
|
if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Read zoned characteristics VPD page 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]);
|
|
}
|
|
|
|
/*
|
|
* 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");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_check_zones - Check the device capacity and zone sizes
|
|
* @sdkp: Target disk
|
|
*
|
|
* Check that the device capacity as reported by READ CAPACITY matches the
|
|
* max_lba value (plus one)of the report zones command reply. Also check that
|
|
* all zones of the device have an equal size, only allowing the last zone of
|
|
* the disk to have a smaller size (runt zone). The zone size must also be a
|
|
* power of two.
|
|
*
|
|
* Returns the zone size in number of blocks upon success or an error code
|
|
* upon failure.
|
|
*/
|
|
static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
|
|
{
|
|
size_t bufsize, buflen;
|
|
unsigned int noio_flag;
|
|
u64 zone_blocks = 0;
|
|
sector_t max_lba, block = 0;
|
|
unsigned char *buf;
|
|
unsigned char *rec;
|
|
int ret;
|
|
u8 same;
|
|
|
|
/* Do all memory allocations as if GFP_NOIO was specified */
|
|
noio_flag = memalloc_noio_save();
|
|
|
|
/* Get a buffer */
|
|
buf = sd_zbc_alloc_report_buffer(sdkp, SD_ZBC_REPORT_MAX_ZONES,
|
|
&bufsize);
|
|
if (!buf) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Do a report zone to get max_lba and the same field */
|
|
ret = sd_zbc_do_report_zones(sdkp, buf, bufsize, 0, false);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
if (sdkp->rc_basis == 0) {
|
|
/* The max_lba field is the capacity of this device */
|
|
max_lba = get_unaligned_be64(&buf[8]);
|
|
if (sdkp->capacity != max_lba + 1) {
|
|
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)max_lba + 1);
|
|
sdkp->capacity = max_lba + 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check same field: for any value other than 0, we know that all zones
|
|
* have the same size.
|
|
*/
|
|
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 */
|
|
buflen = min_t(size_t, get_unaligned_be32(&buf[0]) + 64,
|
|
bufsize);
|
|
rec = buf + 64;
|
|
|
|
/* Parse zone descriptors */
|
|
while (rec < buf + buflen) {
|
|
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_do_report_zones(sdkp, buf, bufsize, block,
|
|
true);
|
|
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 = -EFBIG;
|
|
} else {
|
|
*zblocks = zone_blocks;
|
|
ret = 0;
|
|
}
|
|
|
|
out_free:
|
|
memalloc_noio_restore(noio_flag);
|
|
kvfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
|
|
{
|
|
struct gendisk *disk = sdkp->disk;
|
|
unsigned int nr_zones;
|
|
u32 zone_blocks = 0;
|
|
int ret;
|
|
|
|
if (!sd_is_zoned(sdkp))
|
|
/*
|
|
* Device managed or normal SCSI disk,
|
|
* no special handling required
|
|
*/
|
|
return 0;
|
|
|
|
/* Check zoned block device characteristics (unconstrained reads) */
|
|
ret = sd_zbc_check_zoned_characteristics(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.
|
|
*/
|
|
ret = sd_zbc_check_zones(sdkp, &zone_blocks);
|
|
if (ret != 0)
|
|
goto err;
|
|
|
|
/* The drive satisfies the kernel restrictions: set it up */
|
|
blk_queue_chunk_sectors(sdkp->disk->queue,
|
|
logical_to_sectors(sdkp->device, zone_blocks));
|
|
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, sdkp->disk->queue);
|
|
blk_queue_required_elevator_features(sdkp->disk->queue,
|
|
ELEVATOR_F_ZBD_SEQ_WRITE);
|
|
nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
|
|
|
|
/* READ16/WRITE16 is mandatory for ZBC disks */
|
|
sdkp->device->use_16_for_rw = 1;
|
|
sdkp->device->use_10_for_rw = 0;
|
|
|
|
/*
|
|
* Revalidate the disk zone bitmaps once the block device capacity is
|
|
* set on the second revalidate execution during disk scan and if
|
|
* something changed when executing a normal revalidate.
|
|
*/
|
|
if (sdkp->first_scan) {
|
|
sdkp->zone_blocks = zone_blocks;
|
|
sdkp->nr_zones = nr_zones;
|
|
return 0;
|
|
}
|
|
|
|
if (sdkp->zone_blocks != zone_blocks ||
|
|
sdkp->nr_zones != nr_zones ||
|
|
disk->queue->nr_zones != nr_zones) {
|
|
ret = blk_revalidate_disk_zones(disk);
|
|
if (ret != 0)
|
|
goto err;
|
|
sdkp->zone_blocks = zone_blocks;
|
|
sdkp->nr_zones = nr_zones;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sdkp->capacity = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
}
|