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6ff236e847
scsi_execute_req() is going to be removed. Conver zbc to scsi_execute_cmd(). Signed-off-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
986 lines
27 KiB
C
986 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/blkdev.h>
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#include <linux/vmalloc.h>
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#include <linux/sched/mm.h>
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#include <linux/mutex.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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#define CREATE_TRACE_POINTS
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#include "sd_trace.h"
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/**
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* sd_zbc_get_zone_wp_offset - Get zone write pointer offset.
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* @zone: Zone for which to return the write pointer offset.
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*
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* Return: offset of the write pointer from the start of the zone.
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*/
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static unsigned int sd_zbc_get_zone_wp_offset(struct blk_zone *zone)
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{
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if (zone->type == ZBC_ZONE_TYPE_CONV)
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return 0;
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switch (zone->cond) {
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case BLK_ZONE_COND_IMP_OPEN:
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case BLK_ZONE_COND_EXP_OPEN:
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case BLK_ZONE_COND_CLOSED:
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return zone->wp - zone->start;
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case BLK_ZONE_COND_FULL:
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return zone->len;
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case BLK_ZONE_COND_EMPTY:
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case BLK_ZONE_COND_OFFLINE:
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case BLK_ZONE_COND_READONLY:
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default:
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/*
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* Offline and read-only zones do not have a valid
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* write pointer. Use 0 as for an empty zone.
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*/
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return 0;
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}
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}
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/* Whether or not a SCSI zone descriptor describes a gap zone. */
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static bool sd_zbc_is_gap_zone(const u8 buf[64])
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{
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return (buf[0] & 0xf) == ZBC_ZONE_TYPE_GAP;
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}
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/**
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* sd_zbc_parse_report - Parse a SCSI zone descriptor
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* @sdkp: SCSI disk pointer.
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* @buf: SCSI zone descriptor.
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* @idx: Index of the zone relative to the first zone reported by the current
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* sd_zbc_report_zones() call.
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* @cb: Callback function pointer.
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* @data: Second argument passed to @cb.
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*
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* Return: Value returned by @cb.
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*
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* Convert a SCSI zone descriptor into struct blk_zone format. Additionally,
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* call @cb(blk_zone, @data).
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*/
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static int sd_zbc_parse_report(struct scsi_disk *sdkp, const u8 buf[64],
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unsigned int idx, report_zones_cb cb, void *data)
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{
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struct scsi_device *sdp = sdkp->device;
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struct blk_zone zone = { 0 };
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sector_t start_lba, gran;
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int ret;
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if (WARN_ON_ONCE(sd_zbc_is_gap_zone(buf)))
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return -EINVAL;
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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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start_lba = get_unaligned_be64(&buf[16]);
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zone.start = logical_to_sectors(sdp, start_lba);
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zone.capacity = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
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zone.len = zone.capacity;
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if (sdkp->zone_starting_lba_gran) {
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gran = logical_to_sectors(sdp, sdkp->zone_starting_lba_gran);
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if (zone.len > gran) {
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sd_printk(KERN_ERR, sdkp,
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"Invalid zone at LBA %llu with capacity %llu and length %llu; granularity = %llu\n",
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start_lba,
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sectors_to_logical(sdp, zone.capacity),
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sectors_to_logical(sdp, zone.len),
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sectors_to_logical(sdp, gran));
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return -EINVAL;
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}
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/*
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* Use the starting LBA granularity instead of the zone length
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* obtained from the REPORT ZONES command.
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*/
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zone.len = gran;
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}
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if (zone.cond == ZBC_ZONE_COND_FULL)
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zone.wp = zone.start + zone.len;
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else
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zone.wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
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ret = cb(&zone, idx, data);
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if (ret)
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return ret;
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if (sdkp->rev_wp_offset)
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sdkp->rev_wp_offset[idx] = sd_zbc_get_zone_wp_offset(&zone);
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return 0;
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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: vmalloc-ed 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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const struct scsi_exec_args exec_args = {
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.sshdr = &sshdr,
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};
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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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result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buf, buflen,
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timeout, SD_MAX_RETRIES, &exec_args);
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if (result) {
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sd_printk(KERN_ERR, sdkp,
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"REPORT ZONES start lba %llu failed\n", lba);
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sd_print_result(sdkp, "REPORT ZONES", result);
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if (result > 0 && scsi_sense_valid(&sshdr))
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sd_print_sense_hdr(sdkp, &sshdr);
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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_alloc_report_buffer() - Allocate a buffer for report zones reply.
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* @sdkp: The target disk
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* @nr_zones: Maximum number of zones to report
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* @buflen: Size of the buffer allocated
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*
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* Try to allocate a reply buffer for the number of requested zones.
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* The size of the buffer allocated may be smaller than requested to
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* satify the device constraint (max_hw_sectors, max_segments, etc).
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*
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* Return the address of the allocated buffer and update @buflen with
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* the size of the allocated buffer.
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*/
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static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
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unsigned int nr_zones, size_t *buflen)
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{
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struct request_queue *q = sdkp->disk->queue;
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size_t bufsize;
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void *buf;
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/*
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* Report zone buffer size should be at most 64B times the number of
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* zones requested plus the 64B reply header, but should be aligned
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* to SECTOR_SIZE for ATA devices.
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* Make sure that this size does not exceed the hardware capabilities.
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* Furthermore, since the report zone command cannot be split, make
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* sure that the allocated buffer can always be mapped by limiting the
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* number of pages allocated to the HBA max segments limit.
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*/
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nr_zones = min(nr_zones, sdkp->zone_info.nr_zones);
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bufsize = roundup((nr_zones + 1) * 64, SECTOR_SIZE);
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bufsize = min_t(size_t, bufsize,
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queue_max_hw_sectors(q) << SECTOR_SHIFT);
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bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
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while (bufsize >= SECTOR_SIZE) {
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buf = __vmalloc(bufsize,
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GFP_KERNEL | __GFP_ZERO | __GFP_NORETRY);
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if (buf) {
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*buflen = bufsize;
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return buf;
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}
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bufsize = rounddown(bufsize >> 1, SECTOR_SIZE);
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}
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return NULL;
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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_info.zone_blocks);
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}
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/**
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* sd_zbc_report_zones - SCSI .report_zones() callback.
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* @disk: Disk to report zones for.
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* @sector: Start sector.
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* @nr_zones: Maximum number of zones to report.
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* @cb: Callback function called to report zone information.
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* @data: Second argument passed to @cb.
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*
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* Called by the block layer to iterate over zone information. See also the
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* disk->fops->report_zones() calls in block/blk-zoned.c.
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*/
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int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
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unsigned int nr_zones, report_zones_cb cb, void *data)
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{
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struct scsi_disk *sdkp = scsi_disk(disk);
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sector_t lba = sectors_to_logical(sdkp->device, sector);
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unsigned int nr, i;
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unsigned char *buf;
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u64 zone_length, start_lba;
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size_t offset, buflen = 0;
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int zone_idx = 0;
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int ret;
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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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if (!sdkp->capacity)
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/* Device gone or invalid */
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return -ENODEV;
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buf = sd_zbc_alloc_report_buffer(sdkp, nr_zones, &buflen);
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if (!buf)
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return -ENOMEM;
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while (zone_idx < nr_zones && lba < sdkp->capacity) {
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ret = sd_zbc_do_report_zones(sdkp, buf, buflen, lba, true);
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if (ret)
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goto out;
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offset = 0;
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nr = min(nr_zones, get_unaligned_be32(&buf[0]) / 64);
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if (!nr)
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break;
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for (i = 0; i < nr && zone_idx < nr_zones; i++) {
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offset += 64;
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start_lba = get_unaligned_be64(&buf[offset + 16]);
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zone_length = get_unaligned_be64(&buf[offset + 8]);
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if ((zone_idx == 0 &&
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(lba < start_lba ||
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lba >= start_lba + zone_length)) ||
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(zone_idx > 0 && start_lba != lba) ||
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start_lba + zone_length < start_lba) {
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sd_printk(KERN_ERR, sdkp,
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"Zone %d at LBA %llu is invalid: %llu + %llu\n",
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zone_idx, lba, start_lba, zone_length);
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ret = -EINVAL;
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goto out;
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}
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lba = start_lba + zone_length;
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if (sd_zbc_is_gap_zone(&buf[offset])) {
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if (sdkp->zone_starting_lba_gran)
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continue;
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sd_printk(KERN_ERR, sdkp,
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"Gap zone without constant LBA offsets\n");
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ret = -EINVAL;
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goto out;
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}
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ret = sd_zbc_parse_report(sdkp, buf + offset, zone_idx,
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cb, data);
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if (ret)
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goto out;
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zone_idx++;
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}
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}
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ret = zone_idx;
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out:
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kvfree(buf);
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return ret;
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}
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static blk_status_t sd_zbc_cmnd_checks(struct scsi_cmnd *cmd)
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{
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struct request *rq = scsi_cmd_to_rq(cmd);
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struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
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sector_t sector = blk_rq_pos(rq);
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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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return BLK_STS_OK;
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}
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#define SD_ZBC_INVALID_WP_OFST (~0u)
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#define SD_ZBC_UPDATING_WP_OFST (SD_ZBC_INVALID_WP_OFST - 1)
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static int sd_zbc_update_wp_offset_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct scsi_disk *sdkp = data;
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lockdep_assert_held(&sdkp->zones_wp_offset_lock);
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sdkp->zones_wp_offset[idx] = sd_zbc_get_zone_wp_offset(zone);
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return 0;
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}
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/*
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* An attempt to append a zone triggered an invalid write pointer error.
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* Reread the write pointer of the zone(s) in which the append failed.
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*/
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static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
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{
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struct scsi_disk *sdkp;
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unsigned long flags;
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sector_t zno;
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int ret;
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sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
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spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
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for (zno = 0; zno < sdkp->zone_info.nr_zones; zno++) {
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if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
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continue;
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spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
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ret = sd_zbc_do_report_zones(sdkp, sdkp->zone_wp_update_buf,
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SD_BUF_SIZE,
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zno * sdkp->zone_info.zone_blocks, true);
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spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
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if (!ret)
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sd_zbc_parse_report(sdkp, sdkp->zone_wp_update_buf + 64,
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zno, sd_zbc_update_wp_offset_cb,
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sdkp);
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}
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spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
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scsi_device_put(sdkp->device);
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}
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/**
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* sd_zbc_prepare_zone_append() - Prepare an emulated ZONE_APPEND command.
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* @cmd: the command to setup
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* @lba: the LBA to patch
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* @nr_blocks: the number of LBAs to be written
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*
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* Called from sd_setup_read_write_cmnd() for REQ_OP_ZONE_APPEND.
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* @sd_zbc_prepare_zone_append() handles the necessary zone wrote locking and
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* patching of the lba for an emulated ZONE_APPEND command.
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*
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* In case the cached write pointer offset is %SD_ZBC_INVALID_WP_OFST it will
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* schedule a REPORT ZONES command and return BLK_STS_IOERR.
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*/
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blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
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unsigned int nr_blocks)
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{
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struct request *rq = scsi_cmd_to_rq(cmd);
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struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
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unsigned int wp_offset, zno = blk_rq_zone_no(rq);
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unsigned long flags;
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blk_status_t ret;
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ret = sd_zbc_cmnd_checks(cmd);
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if (ret != BLK_STS_OK)
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return ret;
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if (!blk_rq_zone_is_seq(rq))
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return BLK_STS_IOERR;
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/* Unlock of the write lock will happen in sd_zbc_complete() */
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if (!blk_req_zone_write_trylock(rq))
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return BLK_STS_ZONE_RESOURCE;
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spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
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wp_offset = sdkp->zones_wp_offset[zno];
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switch (wp_offset) {
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case SD_ZBC_INVALID_WP_OFST:
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/*
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* We are about to schedule work to update a zone write pointer
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* offset, which will cause the zone append command to be
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* requeued. So make sure that the scsi device does not go away
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* while the work is being processed.
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*/
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if (scsi_device_get(sdkp->device)) {
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ret = BLK_STS_IOERR;
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break;
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}
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sdkp->zones_wp_offset[zno] = SD_ZBC_UPDATING_WP_OFST;
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schedule_work(&sdkp->zone_wp_offset_work);
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fallthrough;
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case SD_ZBC_UPDATING_WP_OFST:
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ret = BLK_STS_DEV_RESOURCE;
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break;
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default:
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wp_offset = sectors_to_logical(sdkp->device, wp_offset);
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if (wp_offset + nr_blocks > sdkp->zone_info.zone_blocks) {
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ret = BLK_STS_IOERR;
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break;
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}
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trace_scsi_prepare_zone_append(cmd, *lba, wp_offset);
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*lba += wp_offset;
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}
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spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
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if (ret)
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blk_req_zone_write_unlock(rq);
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return ret;
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}
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|
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/**
|
|
* 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 = scsi_cmd_to_rq(cmd);
|
|
sector_t sector = blk_rq_pos(rq);
|
|
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
|
|
sector_t block = sectors_to_logical(sdkp->device, sector);
|
|
blk_status_t ret;
|
|
|
|
ret = sd_zbc_cmnd_checks(cmd);
|
|
if (ret != BLK_STS_OK)
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
|
|
static bool sd_zbc_need_zone_wp_update(struct request *rq)
|
|
{
|
|
switch (req_op(rq)) {
|
|
case REQ_OP_ZONE_APPEND:
|
|
case REQ_OP_ZONE_FINISH:
|
|
case REQ_OP_ZONE_RESET:
|
|
case REQ_OP_ZONE_RESET_ALL:
|
|
return true;
|
|
case REQ_OP_WRITE:
|
|
case REQ_OP_WRITE_ZEROES:
|
|
return blk_rq_zone_is_seq(rq);
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_zone_wp_update - Update cached zone write pointer upon cmd completion
|
|
* @cmd: Completed command
|
|
* @good_bytes: Command reply bytes
|
|
*
|
|
* Called from sd_zbc_complete() to handle the update of the cached zone write
|
|
* pointer value in case an update is needed.
|
|
*/
|
|
static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
|
|
unsigned int good_bytes)
|
|
{
|
|
int result = cmd->result;
|
|
struct request *rq = scsi_cmd_to_rq(cmd);
|
|
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
|
|
unsigned int zno = blk_rq_zone_no(rq);
|
|
enum req_op op = req_op(rq);
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* If we got an error for a command that needs updating the write
|
|
* pointer offset cache, we must mark the zone wp offset entry as
|
|
* invalid to force an update from disk the next time a zone append
|
|
* command is issued.
|
|
*/
|
|
spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
|
|
|
|
if (result && op != REQ_OP_ZONE_RESET_ALL) {
|
|
if (op == REQ_OP_ZONE_APPEND) {
|
|
/* Force complete completion (no retry) */
|
|
good_bytes = 0;
|
|
scsi_set_resid(cmd, blk_rq_bytes(rq));
|
|
}
|
|
|
|
/*
|
|
* Force an update of the zone write pointer offset on
|
|
* the next zone append access.
|
|
*/
|
|
if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
|
|
sdkp->zones_wp_offset[zno] = SD_ZBC_INVALID_WP_OFST;
|
|
goto unlock_wp_offset;
|
|
}
|
|
|
|
switch (op) {
|
|
case REQ_OP_ZONE_APPEND:
|
|
trace_scsi_zone_wp_update(cmd, rq->__sector,
|
|
sdkp->zones_wp_offset[zno], good_bytes);
|
|
rq->__sector += sdkp->zones_wp_offset[zno];
|
|
fallthrough;
|
|
case REQ_OP_WRITE_ZEROES:
|
|
case REQ_OP_WRITE:
|
|
if (sdkp->zones_wp_offset[zno] < sd_zbc_zone_sectors(sdkp))
|
|
sdkp->zones_wp_offset[zno] +=
|
|
good_bytes >> SECTOR_SHIFT;
|
|
break;
|
|
case REQ_OP_ZONE_RESET:
|
|
sdkp->zones_wp_offset[zno] = 0;
|
|
break;
|
|
case REQ_OP_ZONE_FINISH:
|
|
sdkp->zones_wp_offset[zno] = sd_zbc_zone_sectors(sdkp);
|
|
break;
|
|
case REQ_OP_ZONE_RESET_ALL:
|
|
memset(sdkp->zones_wp_offset, 0,
|
|
sdkp->zone_info.nr_zones * sizeof(unsigned int));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
unlock_wp_offset:
|
|
spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
|
|
|
|
return good_bytes;
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_complete - ZBC command post processing.
|
|
* @cmd: Completed command
|
|
* @good_bytes: Command reply bytes
|
|
* @sshdr: command sense header
|
|
*
|
|
* Called from sd_done() to handle zone commands errors and updates to the
|
|
* device queue zone write pointer offset cahce.
|
|
*/
|
|
unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
|
|
struct scsi_sense_hdr *sshdr)
|
|
{
|
|
int result = cmd->result;
|
|
struct request *rq = scsi_cmd_to_rq(cmd);
|
|
|
|
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;
|
|
} else if (sd_zbc_need_zone_wp_update(rq))
|
|
good_bytes = sd_zbc_zone_wp_update(cmd, good_bytes);
|
|
|
|
if (req_op(rq) == REQ_OP_ZONE_APPEND)
|
|
blk_req_zone_write_unlock(rq);
|
|
|
|
return good_bytes;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
u64 zone_starting_lba_gran;
|
|
|
|
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;
|
|
return 0;
|
|
}
|
|
|
|
/* 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 zone alignment method */
|
|
switch (buf[23] & 0xf) {
|
|
case 0:
|
|
case ZBC_CONSTANT_ZONE_LENGTH:
|
|
/* Use zone length */
|
|
break;
|
|
case ZBC_CONSTANT_ZONE_START_OFFSET:
|
|
zone_starting_lba_gran = get_unaligned_be64(&buf[24]);
|
|
if (zone_starting_lba_gran == 0 ||
|
|
!is_power_of_2(zone_starting_lba_gran) ||
|
|
logical_to_sectors(sdkp->device, zone_starting_lba_gran) >
|
|
UINT_MAX) {
|
|
sd_printk(KERN_ERR, sdkp,
|
|
"Invalid zone starting LBA granularity %llu\n",
|
|
zone_starting_lba_gran);
|
|
return -ENODEV;
|
|
}
|
|
sdkp->zone_starting_lba_gran = zone_starting_lba_gran;
|
|
break;
|
|
default:
|
|
sd_printk(KERN_ERR, sdkp, "Invalid zone alignment method\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* 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_capacity - Check the device capacity
|
|
* @sdkp: Target disk
|
|
* @buf: command buffer
|
|
* @zblocks: zone size in logical blocks
|
|
*
|
|
* Get the device zone size and check that the device capacity as reported
|
|
* by READ CAPACITY matches the max_lba value (plus one) of the report zones
|
|
* command reply for devices with RC_BASIS == 0.
|
|
*
|
|
* Returns 0 upon success or an error code upon failure.
|
|
*/
|
|
static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf,
|
|
u32 *zblocks)
|
|
{
|
|
u64 zone_blocks;
|
|
sector_t max_lba;
|
|
unsigned char *rec;
|
|
int ret;
|
|
|
|
/* Do a report zone to get max_lba and the size of the first zone */
|
|
ret = sd_zbc_do_report_zones(sdkp, buf, SD_BUF_SIZE, 0, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (sdkp->zone_starting_lba_gran == 0) {
|
|
/* Get the size of the first reported zone */
|
|
rec = buf + 64;
|
|
zone_blocks = get_unaligned_be64(&rec[8]);
|
|
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 -EFBIG;
|
|
}
|
|
} else {
|
|
zone_blocks = sdkp->zone_starting_lba_gran;
|
|
}
|
|
|
|
if (!is_power_of_2(zone_blocks)) {
|
|
sd_printk(KERN_ERR, sdkp,
|
|
"Zone size %llu is not a power of two.\n",
|
|
zone_blocks);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*zblocks = zone_blocks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sd_zbc_print_zones(struct scsi_disk *sdkp)
|
|
{
|
|
if (!sd_is_zoned(sdkp) || !sdkp->capacity)
|
|
return;
|
|
|
|
if (sdkp->capacity & (sdkp->zone_info.zone_blocks - 1))
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"%u zones of %u logical blocks + 1 runt zone\n",
|
|
sdkp->zone_info.nr_zones - 1,
|
|
sdkp->zone_info.zone_blocks);
|
|
else
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"%u zones of %u logical blocks\n",
|
|
sdkp->zone_info.nr_zones,
|
|
sdkp->zone_info.zone_blocks);
|
|
}
|
|
|
|
static int sd_zbc_init_disk(struct scsi_disk *sdkp)
|
|
{
|
|
sdkp->zones_wp_offset = NULL;
|
|
spin_lock_init(&sdkp->zones_wp_offset_lock);
|
|
sdkp->rev_wp_offset = NULL;
|
|
mutex_init(&sdkp->rev_mutex);
|
|
INIT_WORK(&sdkp->zone_wp_offset_work, sd_zbc_update_wp_offset_workfn);
|
|
sdkp->zone_wp_update_buf = kzalloc(SD_BUF_SIZE, GFP_KERNEL);
|
|
if (!sdkp->zone_wp_update_buf)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sd_zbc_free_zone_info(struct scsi_disk *sdkp)
|
|
{
|
|
if (!sdkp->zone_wp_update_buf)
|
|
return;
|
|
|
|
/* Serialize against revalidate zones */
|
|
mutex_lock(&sdkp->rev_mutex);
|
|
|
|
kvfree(sdkp->zones_wp_offset);
|
|
sdkp->zones_wp_offset = NULL;
|
|
kfree(sdkp->zone_wp_update_buf);
|
|
sdkp->zone_wp_update_buf = NULL;
|
|
|
|
sdkp->early_zone_info = (struct zoned_disk_info){ };
|
|
sdkp->zone_info = (struct zoned_disk_info){ };
|
|
|
|
mutex_unlock(&sdkp->rev_mutex);
|
|
}
|
|
|
|
static void sd_zbc_revalidate_zones_cb(struct gendisk *disk)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(disk);
|
|
|
|
swap(sdkp->zones_wp_offset, sdkp->rev_wp_offset);
|
|
}
|
|
|
|
/*
|
|
* Call blk_revalidate_disk_zones() if any of the zoned disk properties have
|
|
* changed that make it necessary to call that function. Called by
|
|
* sd_revalidate_disk() after the gendisk capacity has been set.
|
|
*/
|
|
int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
|
|
{
|
|
struct gendisk *disk = sdkp->disk;
|
|
struct request_queue *q = disk->queue;
|
|
u32 zone_blocks = sdkp->early_zone_info.zone_blocks;
|
|
unsigned int nr_zones = sdkp->early_zone_info.nr_zones;
|
|
u32 max_append;
|
|
int ret = 0;
|
|
unsigned int flags;
|
|
|
|
/*
|
|
* For all zoned disks, initialize zone append emulation data if not
|
|
* already done. This is necessary also for host-aware disks used as
|
|
* regular disks due to the presence of partitions as these partitions
|
|
* may be deleted and the disk zoned model changed back from
|
|
* BLK_ZONED_NONE to BLK_ZONED_HA.
|
|
*/
|
|
if (sd_is_zoned(sdkp) && !sdkp->zone_wp_update_buf) {
|
|
ret = sd_zbc_init_disk(sdkp);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* There is nothing to do for regular disks, including host-aware disks
|
|
* that have partitions.
|
|
*/
|
|
if (!blk_queue_is_zoned(q))
|
|
return 0;
|
|
|
|
/*
|
|
* Make sure revalidate zones are serialized to ensure exclusive
|
|
* updates of the scsi disk data.
|
|
*/
|
|
mutex_lock(&sdkp->rev_mutex);
|
|
|
|
if (sdkp->zone_info.zone_blocks == zone_blocks &&
|
|
sdkp->zone_info.nr_zones == nr_zones &&
|
|
disk->nr_zones == nr_zones)
|
|
goto unlock;
|
|
|
|
flags = memalloc_noio_save();
|
|
sdkp->zone_info.zone_blocks = zone_blocks;
|
|
sdkp->zone_info.nr_zones = nr_zones;
|
|
sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_KERNEL);
|
|
if (!sdkp->rev_wp_offset) {
|
|
ret = -ENOMEM;
|
|
memalloc_noio_restore(flags);
|
|
goto unlock;
|
|
}
|
|
|
|
ret = blk_revalidate_disk_zones(disk, sd_zbc_revalidate_zones_cb);
|
|
|
|
memalloc_noio_restore(flags);
|
|
kvfree(sdkp->rev_wp_offset);
|
|
sdkp->rev_wp_offset = NULL;
|
|
|
|
if (ret) {
|
|
sdkp->zone_info = (struct zoned_disk_info){ };
|
|
sdkp->capacity = 0;
|
|
goto unlock;
|
|
}
|
|
|
|
max_append = min_t(u32, logical_to_sectors(sdkp->device, zone_blocks),
|
|
q->limits.max_segments << (PAGE_SHIFT - 9));
|
|
max_append = min_t(u32, max_append, queue_max_hw_sectors(q));
|
|
|
|
blk_queue_max_zone_append_sectors(q, max_append);
|
|
|
|
sd_zbc_print_zones(sdkp);
|
|
|
|
unlock:
|
|
mutex_unlock(&sdkp->rev_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sd_zbc_read_zones - Read zone information and update the request queue
|
|
* @sdkp: SCSI disk pointer.
|
|
* @buf: 512 byte buffer used for storing SCSI command output.
|
|
*
|
|
* Read zone information and update the request queue zone characteristics and
|
|
* also the zoned device information in *sdkp. Called by sd_revalidate_disk()
|
|
* before the gendisk capacity has been set.
|
|
*/
|
|
int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
|
|
{
|
|
struct gendisk *disk = sdkp->disk;
|
|
struct request_queue *q = disk->queue;
|
|
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. Nevertheless, free the disk zone information in
|
|
* case the device type changed.
|
|
*/
|
|
sd_zbc_free_zone_info(sdkp);
|
|
return 0;
|
|
}
|
|
|
|
/* READ16/WRITE16/SYNC16 is mandatory for ZBC devices */
|
|
sdkp->device->use_16_for_rw = 1;
|
|
sdkp->device->use_10_for_rw = 0;
|
|
sdkp->device->use_16_for_sync = 1;
|
|
|
|
if (!blk_queue_is_zoned(q)) {
|
|
/*
|
|
* This can happen for a host aware disk with partitions.
|
|
* The block device zone model was already cleared by
|
|
* disk_set_zoned(). Only free the scsi disk zone
|
|
* information and exit early.
|
|
*/
|
|
sd_zbc_free_zone_info(sdkp);
|
|
return 0;
|
|
}
|
|
|
|
/* Check zoned block device characteristics (unconstrained reads) */
|
|
ret = sd_zbc_check_zoned_characteristics(sdkp, buf);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/* Check the device capacity reported by report zones */
|
|
ret = sd_zbc_check_capacity(sdkp, buf, &zone_blocks);
|
|
if (ret != 0)
|
|
goto err;
|
|
|
|
/* The drive satisfies the kernel restrictions: set it up */
|
|
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
|
|
blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
|
|
if (sdkp->zones_max_open == U32_MAX)
|
|
disk_set_max_open_zones(disk, 0);
|
|
else
|
|
disk_set_max_open_zones(disk, sdkp->zones_max_open);
|
|
disk_set_max_active_zones(disk, 0);
|
|
nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
|
|
|
|
/*
|
|
* Per ZBC and ZAC specifications, writes in sequential write required
|
|
* zones of host-managed devices must be aligned to the device physical
|
|
* block size.
|
|
*/
|
|
if (blk_queue_zoned_model(q) == BLK_ZONED_HM)
|
|
blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
|
|
|
|
sdkp->early_zone_info.nr_zones = nr_zones;
|
|
sdkp->early_zone_info.zone_blocks = zone_blocks;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sdkp->capacity = 0;
|
|
|
|
return ret;
|
|
}
|