mirror of https://gitee.com/openkylin/linux.git
511 lines
13 KiB
C
511 lines
13 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 "sd.h"
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/**
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* sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
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* @sdkp: The disk the report originated from
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* @buf: Address of the report zone descriptor
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* @zone: the destination zone structure
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*
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* All LBA sized values are converted to 512B sectors unit.
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*/
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static void sd_zbc_parse_report(struct scsi_disk *sdkp, 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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* sd_zbc_do_report_zones - Issue a REPORT ZONES scsi command.
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* @sdkp: The target disk
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* @buf: Buffer to use for the reply
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* @buflen: the buffer size
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* @lba: Start LBA of the report
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* @partial: Do partial report
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*
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* For internal use during device validation.
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* Using partial=true can significantly speed up execution of a report zones
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* command because the disk does not have to count all possible report matching
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* zones and will only report the count of zones fitting in the command reply
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* buffer.
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*/
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static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
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unsigned int buflen, sector_t lba,
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bool partial)
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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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if (partial)
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cmd[14] = ZBC_REPORT_ZONE_PARTIAL;
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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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/**
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* sd_zbc_report_zones - Disk report zones operation.
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* @disk: The target disk
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* @sector: Start 512B sector of the report
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* @zones: Array of zone descriptors
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* @nr_zones: Number of descriptors in the array
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* @gfp_mask: Memory allocation mask
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*
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* Execute a report zones command on the target disk.
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*/
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int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
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struct blk_zone *zones, unsigned int *nr_zones,
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gfp_t gfp_mask)
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{
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struct scsi_disk *sdkp = scsi_disk(disk);
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unsigned int i, buflen, nrz = *nr_zones;
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unsigned char *buf;
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size_t offset = 0;
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int ret = 0;
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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return -EOPNOTSUPP;
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/*
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* Get a reply buffer for the number of requested zones plus a header,
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* without exceeding the device maximum command size. For ATA disks,
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* buffers must be aligned to 512B.
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*/
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buflen = min(queue_max_hw_sectors(disk->queue) << 9,
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roundup((nrz + 1) * 64, 512));
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buf = kmalloc(buflen, gfp_mask);
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if (!buf)
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return -ENOMEM;
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ret = sd_zbc_do_report_zones(sdkp, buf, buflen,
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sectors_to_logical(sdkp->device, sector), true);
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if (ret)
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goto out_free_buf;
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nrz = min(nrz, get_unaligned_be32(&buf[0]) / 64);
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for (i = 0; i < nrz; i++) {
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offset += 64;
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sd_zbc_parse_report(sdkp, buf + offset, zones);
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zones++;
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}
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*nr_zones = nrz;
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out_free_buf:
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kfree(buf);
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return ret;
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}
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/**
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* sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
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* @sdkp: The target disk
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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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/**
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* sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
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* @cmd: the command to setup
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*
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* Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
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*/
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blk_status_t 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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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return BLK_STS_IOERR;
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if (sdkp->device->changed)
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return BLK_STS_IOERR;
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if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
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/* Unaligned request */
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return BLK_STS_IOERR;
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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 BLK_STS_OK;
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}
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/**
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* sd_zbc_complete - ZBC command post processing.
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* @cmd: Completed command
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* @good_bytes: Command reply bytes
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* @sshdr: command sense header
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*
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* Called from sd_done(). Process report zones reply and handle reset zone
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* and write commands errors.
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*/
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void sd_zbc_complete(struct scsi_cmnd *cmd, 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_ZONE_RESET:
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if (result &&
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sshdr->sense_key == ILLEGAL_REQUEST &&
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sshdr->asc == 0x24)
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/*
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* INVALID FIELD IN CDB error: reset of a conventional
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* zone was attempted. Nothing to worry about, so be
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* quiet about the error.
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*/
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rq->rq_flags |= RQF_QUIET;
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break;
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case REQ_OP_WRITE:
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE_SAME:
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break;
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}
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}
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/**
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* sd_zbc_check_zoned_characteristics - Check zoned block device characteristics
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* @sdkp: Target disk
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* @buf: Buffer where to store the VPD page data
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*
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* Read VPD page B6, get information and check that reads are unconstrained.
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*/
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static int sd_zbc_check_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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"Read zoned characteristics VPD page 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_be32(&buf[8]);
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sdkp->zones_optimal_nonseq = get_unaligned_be32(&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_be32(&buf[16]);
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}
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/*
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* Check for unconstrained reads: host-managed devices with
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* constrained reads (drives failing read after write pointer)
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* are not supported.
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*/
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if (!sdkp->urswrz) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"constrained reads devices are not supported\n");
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return -ENODEV;
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}
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return 0;
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}
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#define SD_ZBC_BUF_SIZE 131072U
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/**
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* sd_zbc_check_zones - Check the device capacity and zone sizes
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* @sdkp: Target disk
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*
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* Check that the device capacity as reported by READ CAPACITY matches the
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* max_lba value (plus one)of the report zones command reply. Also check that
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* all zones of the device have an equal size, only allowing the last zone of
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* the disk to have a smaller size (runt zone). The zone size must also be a
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* power of two.
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*
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* Returns the zone size in number of blocks upon success or an error code
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* upon failure.
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*/
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static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
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{
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u64 zone_blocks = 0;
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sector_t max_lba, 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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/* 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 max_lba and the same field */
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ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0, false);
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if (ret)
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goto out_free;
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if (sdkp->rc_basis == 0) {
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/* The max_lba field is the capacity of this device */
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max_lba = get_unaligned_be64(&buf[8]);
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if (sdkp->capacity != max_lba + 1) {
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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)max_lba + 1);
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sdkp->capacity = max_lba + 1;
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}
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}
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/*
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* Check same field: for any value other than 0, we know that all zones
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* have the same size.
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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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buf_len = min(list_length, SD_ZBC_BUF_SIZE);
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/* Parse zone descriptors */
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while (rec < buf + buf_len) {
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u64 this_zone_blocks = get_unaligned_be64(&rec[8]);
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if (zone_blocks == 0) {
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zone_blocks = this_zone_blocks;
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} else if (this_zone_blocks != zone_blocks &&
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(block + this_zone_blocks < sdkp->capacity
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|| this_zone_blocks > zone_blocks)) {
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zone_blocks = 0;
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goto out;
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}
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block += this_zone_blocks;
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rec += 64;
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}
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if (block < sdkp->capacity) {
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ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
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block, true);
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if (ret)
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goto out_free;
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}
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} while (block < sdkp->capacity);
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out:
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if (!zone_blocks) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Devices with non constant zone "
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"size are not supported\n");
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ret = -ENODEV;
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} else if (!is_power_of_2(zone_blocks)) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Devices with non power of 2 zone "
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"size are not supported\n");
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ret = -ENODEV;
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} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Zone size too large\n");
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ret = -EFBIG;
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} else {
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*zblocks = zone_blocks;
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ret = 0;
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}
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out_free:
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kfree(buf);
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return ret;
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}
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int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
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{
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struct gendisk *disk = sdkp->disk;
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unsigned int nr_zones;
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u32 zone_blocks;
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int ret;
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if (!sd_is_zoned(sdkp))
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/*
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* Device managed or normal SCSI disk,
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* no special handling required
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*/
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return 0;
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/* Check zoned block device characteristics (unconstrained reads) */
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ret = sd_zbc_check_zoned_characteristics(sdkp, buf);
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if (ret)
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goto err;
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/*
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* Check zone size: only devices with a constant zone size (except
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* an eventual last runt zone) that is a power of 2 are supported.
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*/
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ret = sd_zbc_check_zones(sdkp, &zone_blocks);
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if (ret != 0)
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goto err;
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/* The drive satisfies the kernel restrictions: set it up */
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blk_queue_chunk_sectors(sdkp->disk->queue,
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logical_to_sectors(sdkp->device, zone_blocks));
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nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
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/* READ16/WRITE16 is mandatory for ZBC disks */
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sdkp->device->use_16_for_rw = 1;
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sdkp->device->use_10_for_rw = 0;
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/*
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* Revalidate the disk zone bitmaps once the block device capacity is
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* set on the second revalidate execution during disk scan and if
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* something changed when executing a normal revalidate.
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*/
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if (sdkp->first_scan) {
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sdkp->zone_blocks = zone_blocks;
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sdkp->nr_zones = nr_zones;
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return 0;
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}
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if (sdkp->zone_blocks != zone_blocks ||
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sdkp->nr_zones != nr_zones ||
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disk->queue->nr_zones != nr_zones) {
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ret = blk_revalidate_disk_zones(disk);
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if (ret != 0)
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goto err;
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sdkp->zone_blocks = zone_blocks;
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sdkp->nr_zones = nr_zones;
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}
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return 0;
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err:
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sdkp->capacity = 0;
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return ret;
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}
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void sd_zbc_print_zones(struct scsi_disk *sdkp)
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{
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if (!sd_is_zoned(sdkp) || !sdkp->capacity)
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return;
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if (sdkp->capacity & (sdkp->zone_blocks - 1))
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sd_printk(KERN_NOTICE, sdkp,
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"%u zones of %u logical blocks + 1 runt zone\n",
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sdkp->nr_zones - 1,
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sdkp->zone_blocks);
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else
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sd_printk(KERN_NOTICE, sdkp,
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"%u zones of %u logical blocks\n",
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sdkp->nr_zones,
|
|
sdkp->zone_blocks);
|
|
}
|