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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c6463c651d
Normally, sd_read_capacity sets sdp->use_16_for_rw to 1 based on the disk capacity so that READ16/WRITE16 are used for large drives. However, for a zoned disk with RC_BASIS set to 0, the capacity reported through READ_CAPACITY may be very small, leading to use_16_for_rw not being set and READ10/WRITE10 commands being used, even after the actual zoned disk capacity is corrected in sd_zbc_read_zones. This causes LBA offset overflow for accesses beyond 2TB. As the ZBC standard makes it mandatory for ZBC drives to support the READ16/WRITE16 commands anyway, make sure that use_16_for_rw is set. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> eviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
649 lines
15 KiB
C
649 lines
15 KiB
C
/*
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* SCSI Zoned Block commands
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*
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* Copyright (C) 2014-2015 SUSE Linux GmbH
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* Written by: Hannes Reinecke <hare@suse.de>
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* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
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* Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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*/
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#include <linux/blkdev.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_eh.h>
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#include "sd.h"
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#include "scsi_priv.h"
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enum zbc_zone_type {
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ZBC_ZONE_TYPE_CONV = 0x1,
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ZBC_ZONE_TYPE_SEQWRITE_REQ,
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ZBC_ZONE_TYPE_SEQWRITE_PREF,
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ZBC_ZONE_TYPE_RESERVED,
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};
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enum zbc_zone_cond {
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ZBC_ZONE_COND_NO_WP,
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ZBC_ZONE_COND_EMPTY,
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ZBC_ZONE_COND_IMP_OPEN,
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ZBC_ZONE_COND_EXP_OPEN,
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ZBC_ZONE_COND_CLOSED,
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ZBC_ZONE_COND_READONLY = 0xd,
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ZBC_ZONE_COND_FULL,
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ZBC_ZONE_COND_OFFLINE,
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};
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/**
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* Convert a zone descriptor to a zone struct.
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*/
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static void sd_zbc_parse_report(struct scsi_disk *sdkp,
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u8 *buf,
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struct blk_zone *zone)
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{
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struct scsi_device *sdp = sdkp->device;
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memset(zone, 0, sizeof(struct blk_zone));
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zone->type = buf[0] & 0x0f;
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zone->cond = (buf[1] >> 4) & 0xf;
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if (buf[1] & 0x01)
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zone->reset = 1;
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if (buf[1] & 0x02)
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zone->non_seq = 1;
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zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
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zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16]));
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zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
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if (zone->type != ZBC_ZONE_TYPE_CONV &&
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zone->cond == ZBC_ZONE_COND_FULL)
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zone->wp = zone->start + zone->len;
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}
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/**
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* Issue a REPORT ZONES scsi command.
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*/
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static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
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unsigned int buflen, sector_t lba)
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{
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struct scsi_device *sdp = sdkp->device;
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const int timeout = sdp->request_queue->rq_timeout;
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struct scsi_sense_hdr sshdr;
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unsigned char cmd[16];
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unsigned int rep_len;
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int result;
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memset(cmd, 0, 16);
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cmd[0] = ZBC_IN;
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cmd[1] = ZI_REPORT_ZONES;
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put_unaligned_be64(lba, &cmd[2]);
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put_unaligned_be32(buflen, &cmd[10]);
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memset(buf, 0, buflen);
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result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
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buf, buflen, &sshdr,
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timeout, SD_MAX_RETRIES, NULL);
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if (result) {
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sd_printk(KERN_ERR, sdkp,
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"REPORT ZONES lba %llu failed with %d/%d\n",
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(unsigned long long)lba,
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host_byte(result), driver_byte(result));
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return -EIO;
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}
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rep_len = get_unaligned_be32(&buf[0]);
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if (rep_len < 64) {
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sd_printk(KERN_ERR, sdkp,
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"REPORT ZONES report invalid length %u\n",
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rep_len);
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return -EIO;
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}
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return 0;
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}
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int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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sector_t lba, sector = blk_rq_pos(rq);
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unsigned int nr_bytes = blk_rq_bytes(rq);
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int ret;
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WARN_ON(nr_bytes == 0);
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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return BLKPREP_KILL;
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ret = scsi_init_io(cmd);
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if (ret != BLKPREP_OK)
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return ret;
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cmd->cmd_len = 16;
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memset(cmd->cmnd, 0, cmd->cmd_len);
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cmd->cmnd[0] = ZBC_IN;
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cmd->cmnd[1] = ZI_REPORT_ZONES;
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lba = sectors_to_logical(sdkp->device, sector);
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put_unaligned_be64(lba, &cmd->cmnd[2]);
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put_unaligned_be32(nr_bytes, &cmd->cmnd[10]);
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/* Do partial report for speeding things up */
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cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL;
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cmd->sc_data_direction = DMA_FROM_DEVICE;
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cmd->sdb.length = nr_bytes;
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cmd->transfersize = sdkp->device->sector_size;
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cmd->allowed = 0;
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/*
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* Report may return less bytes than requested. Make sure
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* to report completion on the entire initial request.
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*/
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rq->__data_len = nr_bytes;
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return BLKPREP_OK;
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}
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static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
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unsigned int good_bytes)
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{
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struct request *rq = scmd->request;
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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struct sg_mapping_iter miter;
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struct blk_zone_report_hdr hdr;
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struct blk_zone zone;
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unsigned int offset, bytes = 0;
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unsigned long flags;
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u8 *buf;
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if (good_bytes < 64)
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return;
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memset(&hdr, 0, sizeof(struct blk_zone_report_hdr));
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sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
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SG_MITER_TO_SG | SG_MITER_ATOMIC);
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local_irq_save(flags);
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while (sg_miter_next(&miter) && bytes < good_bytes) {
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buf = miter.addr;
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offset = 0;
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if (bytes == 0) {
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/* Set the report header */
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hdr.nr_zones = min_t(unsigned int,
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(good_bytes - 64) / 64,
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get_unaligned_be32(&buf[0]) / 64);
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memcpy(buf, &hdr, sizeof(struct blk_zone_report_hdr));
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offset += 64;
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bytes += 64;
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}
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/* Parse zone descriptors */
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while (offset < miter.length && hdr.nr_zones) {
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WARN_ON(offset > miter.length);
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buf = miter.addr + offset;
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sd_zbc_parse_report(sdkp, buf, &zone);
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memcpy(buf, &zone, sizeof(struct blk_zone));
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offset += 64;
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bytes += 64;
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hdr.nr_zones--;
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}
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if (!hdr.nr_zones)
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break;
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}
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sg_miter_stop(&miter);
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local_irq_restore(flags);
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}
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static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
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{
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return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
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}
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static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp,
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sector_t sector)
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{
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return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift;
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}
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int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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sector_t sector = blk_rq_pos(rq);
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sector_t block = sectors_to_logical(sdkp->device, sector);
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unsigned int zno = block >> sdkp->zone_shift;
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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return BLKPREP_KILL;
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if (sdkp->device->changed)
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return BLKPREP_KILL;
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if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
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/* Unaligned request */
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return BLKPREP_KILL;
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/* Do not allow concurrent reset and writes */
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if (sdkp->zones_wlock &&
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test_and_set_bit(zno, sdkp->zones_wlock))
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return BLKPREP_DEFER;
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cmd->cmd_len = 16;
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memset(cmd->cmnd, 0, cmd->cmd_len);
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cmd->cmnd[0] = ZBC_OUT;
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cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
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put_unaligned_be64(block, &cmd->cmnd[2]);
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rq->timeout = SD_TIMEOUT;
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cmd->sc_data_direction = DMA_NONE;
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cmd->transfersize = 0;
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cmd->allowed = 0;
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return BLKPREP_OK;
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}
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int sd_zbc_setup_write_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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sector_t sector = blk_rq_pos(rq);
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sector_t zone_sectors = sd_zbc_zone_sectors(sdkp);
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unsigned int zno = sd_zbc_zone_no(sdkp, sector);
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/*
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* Note: Checks of the alignment of the write command on
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* logical blocks is done in sd.c
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*/
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/* Do not allow zone boundaries crossing on host-managed drives */
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if (blk_queue_zoned_model(sdkp->disk->queue) == BLK_ZONED_HM &&
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(sector & (zone_sectors - 1)) + blk_rq_sectors(rq) > zone_sectors)
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return BLKPREP_KILL;
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/*
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* Do not issue more than one write at a time per
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* zone. This solves write ordering problems due to
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* the unlocking of the request queue in the dispatch
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* path in the non scsi-mq case. For scsi-mq, this
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* also avoids potential write reordering when multiple
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* threads running on different CPUs write to the same
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* zone (with a synchronized sequential pattern).
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*/
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if (sdkp->zones_wlock &&
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test_and_set_bit(zno, sdkp->zones_wlock))
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return BLKPREP_DEFER;
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return BLKPREP_OK;
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}
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static void sd_zbc_unlock_zone(struct request *rq)
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{
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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if (sdkp->zones_wlock) {
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unsigned int zno = sd_zbc_zone_no(sdkp, blk_rq_pos(rq));
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WARN_ON_ONCE(!test_bit(zno, sdkp->zones_wlock));
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clear_bit_unlock(zno, sdkp->zones_wlock);
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smp_mb__after_atomic();
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}
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}
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void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd)
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{
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sd_zbc_unlock_zone(cmd->request);
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}
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void sd_zbc_complete(struct scsi_cmnd *cmd,
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unsigned int good_bytes,
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struct scsi_sense_hdr *sshdr)
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{
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int result = cmd->result;
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struct request *rq = cmd->request;
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switch (req_op(rq)) {
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case REQ_OP_WRITE:
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case REQ_OP_WRITE_SAME:
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case REQ_OP_ZONE_RESET:
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/* Unlock the zone */
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sd_zbc_unlock_zone(rq);
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if (!result ||
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sshdr->sense_key != ILLEGAL_REQUEST)
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break;
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switch (sshdr->asc) {
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case 0x24:
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/*
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* INVALID FIELD IN CDB error: For a zone reset,
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* this means that a reset of a conventional
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* zone was attempted. Nothing to worry about in
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* this case, so be quiet about the error.
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*/
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if (req_op(rq) == REQ_OP_ZONE_RESET)
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rq->rq_flags |= RQF_QUIET;
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break;
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case 0x21:
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/*
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* INVALID ADDRESS FOR WRITE error: It is unlikely that
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* retrying write requests failed with any kind of
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* alignement error will result in success. So don't.
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*/
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cmd->allowed = 0;
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break;
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}
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break;
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case REQ_OP_ZONE_REPORT:
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if (!result)
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sd_zbc_report_zones_complete(cmd, good_bytes);
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break;
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}
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}
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/**
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* Read zoned block device characteristics (VPD page B6).
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*/
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static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
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unsigned char *buf)
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{
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if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
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sd_printk(KERN_NOTICE, sdkp,
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"Unconstrained-read check failed\n");
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return -ENODEV;
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}
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if (sdkp->device->type != TYPE_ZBC) {
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/* Host-aware */
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sdkp->urswrz = 1;
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sdkp->zones_optimal_open = get_unaligned_be64(&buf[8]);
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sdkp->zones_optimal_nonseq = get_unaligned_be64(&buf[12]);
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sdkp->zones_max_open = 0;
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} else {
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/* Host-managed */
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sdkp->urswrz = buf[4] & 1;
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sdkp->zones_optimal_open = 0;
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sdkp->zones_optimal_nonseq = 0;
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sdkp->zones_max_open = get_unaligned_be64(&buf[16]);
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}
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return 0;
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}
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/**
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* Check reported capacity.
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*/
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static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
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unsigned char *buf)
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{
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sector_t lba;
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int ret;
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if (sdkp->rc_basis != 0)
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return 0;
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/* Do a report zone to get the maximum LBA to check capacity */
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ret = sd_zbc_report_zones(sdkp, buf, SD_BUF_SIZE, 0);
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if (ret)
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return ret;
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/* The max_lba field is the capacity of this device */
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lba = get_unaligned_be64(&buf[8]);
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if (lba + 1 == sdkp->capacity)
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return 0;
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if (sdkp->first_scan)
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sd_printk(KERN_WARNING, sdkp,
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"Changing capacity from %llu to max LBA+1 %llu\n",
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(unsigned long long)sdkp->capacity,
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(unsigned long long)lba + 1);
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sdkp->capacity = lba + 1;
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return 0;
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}
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#define SD_ZBC_BUF_SIZE 131072
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static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
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{
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u64 zone_blocks;
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sector_t block = 0;
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unsigned char *buf;
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unsigned char *rec;
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unsigned int buf_len;
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unsigned int list_length;
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int ret;
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u8 same;
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sdkp->zone_blocks = 0;
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/* Get a buffer */
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buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* Do a report zone to get the same field */
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ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0);
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if (ret) {
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zone_blocks = 0;
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goto out;
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}
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same = buf[4] & 0x0f;
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if (same > 0) {
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rec = &buf[64];
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zone_blocks = get_unaligned_be64(&rec[8]);
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goto out;
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}
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/*
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* Check the size of all zones: all zones must be of
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* equal size, except the last zone which can be smaller
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* than other zones.
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*/
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do {
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/* Parse REPORT ZONES header */
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list_length = get_unaligned_be32(&buf[0]) + 64;
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rec = buf + 64;
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if (list_length < SD_ZBC_BUF_SIZE)
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buf_len = list_length;
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else
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buf_len = SD_ZBC_BUF_SIZE;
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/* Parse zone descriptors */
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while (rec < buf + buf_len) {
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zone_blocks = get_unaligned_be64(&rec[8]);
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if (sdkp->zone_blocks == 0) {
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sdkp->zone_blocks = zone_blocks;
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} else if (zone_blocks != sdkp->zone_blocks &&
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(block + zone_blocks < sdkp->capacity
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|| zone_blocks > sdkp->zone_blocks)) {
|
|
zone_blocks = 0;
|
|
goto out;
|
|
}
|
|
block += zone_blocks;
|
|
rec += 64;
|
|
}
|
|
|
|
if (block < sdkp->capacity) {
|
|
ret = sd_zbc_report_zones(sdkp, buf,
|
|
SD_ZBC_BUF_SIZE, block);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
} while (block < sdkp->capacity);
|
|
|
|
zone_blocks = sdkp->zone_blocks;
|
|
|
|
out:
|
|
kfree(buf);
|
|
|
|
if (!zone_blocks) {
|
|
if (sdkp->first_scan)
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Devices with non constant zone "
|
|
"size are not supported\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
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");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
|
|
if (sdkp->first_scan)
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Zone size too large\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
sdkp->zone_blocks = zone_blocks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sd_zbc_setup(struct scsi_disk *sdkp)
|
|
{
|
|
|
|
/* chunk_sectors indicates the zone size */
|
|
blk_queue_chunk_sectors(sdkp->disk->queue,
|
|
logical_to_sectors(sdkp->device, sdkp->zone_blocks));
|
|
sdkp->zone_shift = ilog2(sdkp->zone_blocks);
|
|
sdkp->nr_zones = sdkp->capacity >> sdkp->zone_shift;
|
|
if (sdkp->capacity & (sdkp->zone_blocks - 1))
|
|
sdkp->nr_zones++;
|
|
|
|
if (!sdkp->zones_wlock) {
|
|
sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones),
|
|
sizeof(unsigned long),
|
|
GFP_KERNEL);
|
|
if (!sdkp->zones_wlock)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_zbc_read_zones(struct scsi_disk *sdkp,
|
|
unsigned char *buf)
|
|
{
|
|
sector_t capacity;
|
|
int ret = 0;
|
|
|
|
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;
|
|
capacity = logical_to_sectors(sdkp->device, sdkp->capacity);
|
|
|
|
/*
|
|
* 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_zone_size(sdkp);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/* The drive satisfies the kernel restrictions: set it up */
|
|
ret = sd_zbc_setup(sdkp);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/* READ16/WRITE16 is mandatory for ZBC disks */
|
|
sdkp->device->use_16_for_rw = 1;
|
|
sdkp->device->use_10_for_rw = 0;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sdkp->capacity = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void sd_zbc_remove(struct scsi_disk *sdkp)
|
|
{
|
|
kfree(sdkp->zones_wlock);
|
|
sdkp->zones_wlock = NULL;
|
|
}
|
|
|
|
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);
|
|
}
|