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846 lines
22 KiB
846 lines
22 KiB
// 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 <[email protected]> |
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* Modified by: Damien Le Moal <[email protected]> |
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* Modified by: Shaun Tancheff <[email protected]> |
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*/ |
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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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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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|
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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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static int sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf, |
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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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int ret; |
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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.capacity = zone.len; |
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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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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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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_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 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->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_blocks); |
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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 capacity = logical_to_sectors(sdkp->device, sdkp->capacity); |
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unsigned int nr, i; |
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unsigned char *buf; |
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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 (!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 && sector < capacity) { |
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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; |
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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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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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sector += sd_zbc_zone_sectors(sdkp) * i; |
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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->rq_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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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->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_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->rq_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_blocks) { |
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ret = BLK_STS_IOERR; |
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break; |
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} |
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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 |
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* can be RESET WRITE POINTER, OPEN, CLOSE or FINISH. |
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* @cmd: the command to setup |
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* @op: Operation to be performed |
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* @all: All zones control |
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* |
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* Called from sd_init_command() for REQ_OP_ZONE_RESET, REQ_OP_ZONE_RESET_ALL, |
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* REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE or REQ_OP_ZONE_FINISH requests. |
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*/ |
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blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd, |
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unsigned char op, bool all) |
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{ |
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struct request *rq = scsi_cmd_to_rq(cmd); |
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sector_t sector = blk_rq_pos(rq); |
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
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sector_t block = sectors_to_logical(sdkp->device, sector); |
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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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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] = op; |
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if (all) |
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cmd->cmnd[14] = 0x1; |
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else |
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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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static bool sd_zbc_need_zone_wp_update(struct request *rq) |
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{ |
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switch (req_op(rq)) { |
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case REQ_OP_ZONE_APPEND: |
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case REQ_OP_ZONE_FINISH: |
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case REQ_OP_ZONE_RESET: |
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case REQ_OP_ZONE_RESET_ALL: |
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return true; |
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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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return blk_rq_zone_is_seq(rq); |
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default: |
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return false; |
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} |
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} |
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/** |
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* sd_zbc_zone_wp_update - Update cached zone write pointer upon cmd completion |
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* @cmd: Completed command |
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* @good_bytes: Command reply bytes |
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* |
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* Called from sd_zbc_complete() to handle the update of the cached zone write |
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* pointer value in case an update is needed. |
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*/ |
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static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd, |
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unsigned int good_bytes) |
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{ |
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int result = cmd->result; |
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struct request *rq = scsi_cmd_to_rq(cmd); |
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
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unsigned int zno = blk_rq_zone_no(rq); |
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enum req_opf op = req_op(rq); |
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unsigned long flags; |
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/* |
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* If we got an error for a command that needs updating the write |
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* pointer offset cache, we must mark the zone wp offset entry as |
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* invalid to force an update from disk the next time a zone append |
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* command is issued. |
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*/ |
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spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags); |
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|
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if (result && op != REQ_OP_ZONE_RESET_ALL) { |
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if (op == REQ_OP_ZONE_APPEND) { |
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/* Force complete completion (no retry) */ |
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good_bytes = 0; |
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scsi_set_resid(cmd, blk_rq_bytes(rq)); |
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} |
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|
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/* |
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* Force an update of the zone write pointer offset on |
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* the next zone append access. |
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*/ |
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if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST) |
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sdkp->zones_wp_offset[zno] = SD_ZBC_INVALID_WP_OFST; |
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goto unlock_wp_offset; |
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} |
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|
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switch (op) { |
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case REQ_OP_ZONE_APPEND: |
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rq->__sector += sdkp->zones_wp_offset[zno]; |
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fallthrough; |
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case REQ_OP_WRITE_ZEROES: |
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case REQ_OP_WRITE_SAME: |
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case REQ_OP_WRITE: |
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if (sdkp->zones_wp_offset[zno] < sd_zbc_zone_sectors(sdkp)) |
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sdkp->zones_wp_offset[zno] += |
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good_bytes >> SECTOR_SHIFT; |
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break; |
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case REQ_OP_ZONE_RESET: |
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sdkp->zones_wp_offset[zno] = 0; |
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break; |
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case REQ_OP_ZONE_FINISH: |
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sdkp->zones_wp_offset[zno] = sd_zbc_zone_sectors(sdkp); |
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break; |
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case REQ_OP_ZONE_RESET_ALL: |
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memset(sdkp->zones_wp_offset, 0, |
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sdkp->nr_zones * sizeof(unsigned int)); |
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break; |
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default: |
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break; |
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} |
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unlock_wp_offset: |
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spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags); |
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|
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return good_bytes; |
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} |
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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() to handle zone commands errors and updates to the |
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* device queue zone write pointer offset cahce. |
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*/ |
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unsigned int 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 = scsi_cmd_to_rq(cmd); |
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|
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if (op_is_zone_mgmt(req_op(rq)) && |
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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: a zone management command was |
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* attempted on a conventional zone. Nothing to worry about, |
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* so be quiet about the error. |
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*/ |
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rq->rq_flags |= RQF_QUIET; |
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} else if (sd_zbc_need_zone_wp_update(rq)) |
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good_bytes = sd_zbc_zone_wp_update(cmd, good_bytes); |
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|
|
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) |
|
{ |
|
|
|
if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) { |
|
sd_printk(KERN_NOTICE, sdkp, |
|
"Read zoned characteristics VPD page failed\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (sdkp->device->type != TYPE_ZBC) { |
|
/* Host-aware */ |
|
sdkp->urswrz = 1; |
|
sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]); |
|
sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]); |
|
sdkp->zones_max_open = 0; |
|
} else { |
|
/* Host-managed */ |
|
sdkp->urswrz = buf[4] & 1; |
|
sdkp->zones_optimal_open = 0; |
|
sdkp->zones_optimal_nonseq = 0; |
|
sdkp->zones_max_open = get_unaligned_be32(&buf[16]); |
|
} |
|
|
|
/* |
|
* Check for unconstrained reads: host-managed devices with |
|
* constrained reads (drives failing read after write pointer) |
|
* are not supported. |
|
*/ |
|
if (!sdkp->urswrz) { |
|
if (sdkp->first_scan) |
|
sd_printk(KERN_NOTICE, sdkp, |
|
"constrained reads devices are not supported\n"); |
|
return -ENODEV; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* sd_zbc_check_capacity - Check the device capacity |
|
* @sdkp: Target disk |
|
* @buf: command buffer |
|
* @zblocks: zone size in number of 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; |
|
} |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
*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_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); |
|
} |
|
|
|
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; |
|
} |
|
|
|
static void sd_zbc_clear_zone_info(struct scsi_disk *sdkp) |
|
{ |
|
/* 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->nr_zones = 0; |
|
sdkp->rev_nr_zones = 0; |
|
sdkp->zone_blocks = 0; |
|
sdkp->rev_zone_blocks = 0; |
|
|
|
mutex_unlock(&sdkp->rev_mutex); |
|
} |
|
|
|
void sd_zbc_release_disk(struct scsi_disk *sdkp) |
|
{ |
|
if (sd_is_zoned(sdkp)) |
|
sd_zbc_clear_zone_info(sdkp); |
|
} |
|
|
|
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); |
|
} |
|
|
|
int sd_zbc_revalidate_zones(struct scsi_disk *sdkp) |
|
{ |
|
struct gendisk *disk = sdkp->disk; |
|
struct request_queue *q = disk->queue; |
|
u32 zone_blocks = sdkp->rev_zone_blocks; |
|
unsigned int nr_zones = sdkp->rev_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_blocks == zone_blocks && |
|
sdkp->nr_zones == nr_zones && |
|
disk->queue->nr_zones == nr_zones) |
|
goto unlock; |
|
|
|
flags = memalloc_noio_save(); |
|
sdkp->zone_blocks = zone_blocks; |
|
sdkp->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_blocks = 0; |
|
sdkp->nr_zones = 0; |
|
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; |
|
} |
|
|
|
int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) |
|
{ |
|
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 |
|
*/ |
|
return 0; |
|
|
|
/* READ16/WRITE16 is mandatory for ZBC disks */ |
|
sdkp->device->use_16_for_rw = 1; |
|
sdkp->device->use_10_for_rw = 0; |
|
|
|
if (!blk_queue_is_zoned(q)) { |
|
/* |
|
* This can happen for a host aware disk with partitions. |
|
* The block device zone information was already cleared |
|
* by blk_queue_set_zoned(). Only clear the scsi disk zone |
|
* information and exit early. |
|
*/ |
|
sd_zbc_clear_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) |
|
blk_queue_max_open_zones(q, 0); |
|
else |
|
blk_queue_max_open_zones(q, sdkp->zones_max_open); |
|
blk_queue_max_active_zones(q, 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->rev_nr_zones = nr_zones; |
|
sdkp->rev_zone_blocks = zone_blocks; |
|
|
|
return 0; |
|
|
|
err: |
|
sdkp->capacity = 0; |
|
|
|
return ret; |
|
}
|
|
|