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c976e588b3
ZBC-2 allows host-managed disks to report gap zones. This allow zoned disks to report an offset between data zone starts that is a power of two even if the number of logical blocks with data per zone is not a power of two. Another new feature in ZBC-2 is support for constant zone starting LBA offsets. For zoned disks that report a constant zone starting LBA offset, hide the gap zones from the block layer. Report the offset between data zone starts as zone size and report the number of logical blocks with data per zone as the zone capacity. Link: https://lore.kernel.org/r/20220421183023.3462291-7-bvanassche@acm.org Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> [ bvanassche: Reworked this patch ] Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
298 lines
7.7 KiB
C
298 lines
7.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _SCSI_DISK_H
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#define _SCSI_DISK_H
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/*
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* More than enough for everybody ;) The huge number of majors
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* is a leftover from 16bit dev_t days, we don't really need that
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* much numberspace.
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*/
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#define SD_MAJORS 16
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/*
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* Time out in seconds for disks and Magneto-opticals (which are slower).
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*/
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#define SD_TIMEOUT (30 * HZ)
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#define SD_MOD_TIMEOUT (75 * HZ)
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/*
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* Flush timeout is a multiplier over the standard device timeout which is
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* user modifiable via sysfs but initially set to SD_TIMEOUT
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*/
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#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
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#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
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/*
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* Number of allowed retries
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*/
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#define SD_MAX_RETRIES 5
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#define SD_PASSTHROUGH_RETRIES 1
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#define SD_MAX_MEDIUM_TIMEOUTS 2
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/*
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* Size of the initial data buffer for mode and read capacity data
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*/
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#define SD_BUF_SIZE 512
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/*
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* Number of sectors at the end of the device to avoid multi-sector
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* accesses to in the case of last_sector_bug
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*/
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#define SD_LAST_BUGGY_SECTORS 8
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enum {
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SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
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SD_MEMPOOL_SIZE = 2, /* CDB pool size */
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};
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enum {
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SD_DEF_XFER_BLOCKS = 0xffff,
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SD_MAX_XFER_BLOCKS = 0xffffffff,
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SD_MAX_WS10_BLOCKS = 0xffff,
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SD_MAX_WS16_BLOCKS = 0x7fffff,
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};
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enum {
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SD_LBP_FULL = 0, /* Full logical block provisioning */
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SD_LBP_UNMAP, /* Use UNMAP command */
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SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
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SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
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SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
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SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
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};
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enum {
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SD_ZERO_WRITE = 0, /* Use WRITE(10/16) command */
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SD_ZERO_WS, /* Use WRITE SAME(10/16) command */
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SD_ZERO_WS16_UNMAP, /* Use WRITE SAME(16) with UNMAP */
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SD_ZERO_WS10_UNMAP, /* Use WRITE SAME(10) with UNMAP */
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};
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/**
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* struct zoned_disk_info - Specific properties of a ZBC SCSI device.
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* @nr_zones: number of zones.
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* @zone_blocks: number of logical blocks per zone.
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*
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* This data structure holds the ZBC SCSI device properties that are retrieved
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* twice: a first time before the gendisk capacity is known and a second time
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* after the gendisk capacity is known.
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*/
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struct zoned_disk_info {
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u32 nr_zones;
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u32 zone_blocks;
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};
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struct scsi_disk {
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struct scsi_device *device;
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/*
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* disk_dev is used to show attributes in /sys/class/scsi_disk/,
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* but otherwise not really needed. Do not use for refcounting.
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*/
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struct device disk_dev;
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struct gendisk *disk;
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struct opal_dev *opal_dev;
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#ifdef CONFIG_BLK_DEV_ZONED
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/* Updated during revalidation before the gendisk capacity is known. */
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struct zoned_disk_info early_zone_info;
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/* Updated during revalidation after the gendisk capacity is known. */
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struct zoned_disk_info zone_info;
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u32 zones_optimal_open;
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u32 zones_optimal_nonseq;
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u32 zones_max_open;
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/*
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* Either zero or a power of two. If not zero it means that the offset
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* between zone starting LBAs is constant.
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*/
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u32 zone_starting_lba_gran;
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u32 *zones_wp_offset;
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spinlock_t zones_wp_offset_lock;
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u32 *rev_wp_offset;
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struct mutex rev_mutex;
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struct work_struct zone_wp_offset_work;
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char *zone_wp_update_buf;
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#endif
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atomic_t openers;
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sector_t capacity; /* size in logical blocks */
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int max_retries;
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u32 max_xfer_blocks;
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u32 opt_xfer_blocks;
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u32 max_ws_blocks;
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u32 max_unmap_blocks;
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u32 unmap_granularity;
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u32 unmap_alignment;
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u32 index;
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unsigned int physical_block_size;
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unsigned int max_medium_access_timeouts;
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unsigned int medium_access_timed_out;
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u8 media_present;
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u8 write_prot;
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u8 protection_type;/* Data Integrity Field */
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u8 provisioning_mode;
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u8 zeroing_mode;
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u8 nr_actuators; /* Number of actuators */
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unsigned ATO : 1; /* state of disk ATO bit */
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unsigned cache_override : 1; /* temp override of WCE,RCD */
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unsigned WCE : 1; /* state of disk WCE bit */
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unsigned RCD : 1; /* state of disk RCD bit, unused */
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unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
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unsigned first_scan : 1;
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unsigned lbpme : 1;
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unsigned lbprz : 1;
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unsigned lbpu : 1;
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unsigned lbpws : 1;
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unsigned lbpws10 : 1;
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unsigned lbpvpd : 1;
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unsigned ws10 : 1;
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unsigned ws16 : 1;
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unsigned rc_basis: 2;
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unsigned zoned: 2;
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unsigned urswrz : 1;
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unsigned security : 1;
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unsigned ignore_medium_access_errors : 1;
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};
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#define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)
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static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
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{
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return disk->private_data;
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}
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#define sd_printk(prefix, sdsk, fmt, a...) \
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(sdsk)->disk ? \
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sdev_prefix_printk(prefix, (sdsk)->device, \
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(sdsk)->disk->disk_name, fmt, ##a) : \
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sdev_printk(prefix, (sdsk)->device, fmt, ##a)
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#define sd_first_printk(prefix, sdsk, fmt, a...) \
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do { \
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if ((sdsk)->first_scan) \
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sd_printk(prefix, sdsk, fmt, ##a); \
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} while (0)
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static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
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{
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switch (scmd->cmnd[0]) {
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case READ_6:
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case READ_10:
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case READ_12:
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case READ_16:
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case SYNCHRONIZE_CACHE:
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case VERIFY:
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case VERIFY_12:
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case VERIFY_16:
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case WRITE_6:
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case WRITE_10:
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case WRITE_12:
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case WRITE_16:
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case WRITE_SAME:
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case WRITE_SAME_16:
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case UNMAP:
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return 1;
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case VARIABLE_LENGTH_CMD:
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switch (scmd->cmnd[9]) {
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case READ_32:
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case VERIFY_32:
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case WRITE_32:
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case WRITE_SAME_32:
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return 1;
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}
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}
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return 0;
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}
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static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
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{
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return blocks << (ilog2(sdev->sector_size) - 9);
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}
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static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
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{
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return blocks * sdev->sector_size;
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}
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static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
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{
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return bytes >> ilog2(sdev->sector_size);
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}
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static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
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{
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return sector >> (ilog2(sdev->sector_size) - 9);
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}
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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extern void sd_dif_config_host(struct scsi_disk *);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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static inline void sd_dif_config_host(struct scsi_disk *disk)
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{
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}
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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static inline int sd_is_zoned(struct scsi_disk *sdkp)
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{
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return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
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}
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#ifdef CONFIG_BLK_DEV_ZONED
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void sd_zbc_release_disk(struct scsi_disk *sdkp);
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int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]);
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int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
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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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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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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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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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#else /* CONFIG_BLK_DEV_ZONED */
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static inline void sd_zbc_release_disk(struct scsi_disk *sdkp) {}
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static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
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{
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return 0;
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}
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static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
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{
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return 0;
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}
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static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
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unsigned char op,
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bool all)
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{
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return BLK_STS_TARGET;
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}
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static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
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unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
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{
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return good_bytes;
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}
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static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
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sector_t *lba,
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unsigned int nr_blocks)
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{
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return BLK_STS_TARGET;
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}
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#define sd_zbc_report_zones NULL
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#endif /* CONFIG_BLK_DEV_ZONED */
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void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
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void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);
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#endif /* _SCSI_DISK_H */
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