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- /* SPDX-License-Identifier: BSD-3-Clause */
- /*
- * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
- * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
- *
- * From Linux kernel include/uapi/linux/virtio_blk.h
- */
- #ifndef _LINUX_VIRTIO_BLK_H
- #define _LINUX_VIRTIO_BLK_H
- /* Feature bits */
- #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
- #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
- #define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */
- #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
- #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available */
- #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */
- #define VIRTIO_BLK_F_MQ 12 /* Support more than one vq */
- /* Legacy feature bits */
- #ifndef VIRTIO_BLK_NO_LEGACY
- #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
- #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
- #define VIRTIO_BLK_F_FLUSH 9 /* Flush command supported */
- #define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */
- #ifndef __KERNEL__
- /* Old (deprecated) name for VIRTIO_BLK_F_FLUSH */
- #define VIRTIO_BLK_F_WCE VIRTIO_BLK_F_FLUSH
- #endif
- #endif /* !VIRTIO_BLK_NO_LEGACY */
- #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
- struct __packed virtio_blk_config {
- /* The capacity (in 512-byte sectors) */
- __u64 capacity;
- /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
- __u32 size_max;
- /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
- __u32 seg_max;
- /* geometry of the device (if VIRTIO_BLK_F_GEOMETRY) */
- struct virtio_blk_geometry {
- __u16 cylinders;
- __u8 heads;
- __u8 sectors;
- } geometry;
- /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
- __u32 blk_size;
- /* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */
- /* exponent for physical block per logical block */
- __u8 physical_block_exp;
- /* alignment offset in logical blocks */
- __u8 alignment_offset;
- /* minimum I/O size without performance penalty in logical blocks */
- __u16 min_io_size;
- /* optimal sustained I/O size in logical blocks */
- __u32 opt_io_size;
- /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */
- __u8 wce;
- __u8 unused;
- /* number of vqs, only available when VIRTIO_BLK_F_MQ is set */
- __u16 num_queues;
- };
- /*
- * Command types
- *
- * Usage is a bit tricky as some bits are used as flags and some are not.
- *
- * Rules:
- * VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or
- * VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own
- * and may not be combined with any of the other flags.
- */
- /* These two define direction */
- #define VIRTIO_BLK_T_IN 0
- #define VIRTIO_BLK_T_OUT 1
- #ifndef VIRTIO_BLK_NO_LEGACY
- /* This bit says it's a scsi command, not an actual read or write */
- #define VIRTIO_BLK_T_SCSI_CMD 2
- #endif /* VIRTIO_BLK_NO_LEGACY */
- /* Cache flush command */
- #define VIRTIO_BLK_T_FLUSH 4
- /* Get device ID command */
- #define VIRTIO_BLK_T_GET_ID 8
- #ifndef VIRTIO_BLK_NO_LEGACY
- /* Barrier before this op */
- #define VIRTIO_BLK_T_BARRIER 0x80000000
- #endif /* !VIRTIO_BLK_NO_LEGACY */
- /*
- * This comes first in the read scatter-gather list.
- * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated,
- * this is the first element of the read scatter-gather list.
- */
- struct virtio_blk_outhdr {
- /* VIRTIO_BLK_T* */
- __virtio32 type;
- /* io priority */
- __virtio32 ioprio;
- /* Sector (ie. 512 byte offset) */
- __virtio64 sector;
- };
- #ifndef VIRTIO_BLK_NO_LEGACY
- struct virtio_scsi_inhdr {
- __virtio32 errors;
- __virtio32 data_len;
- __virtio32 sense_len;
- __virtio32 residual;
- };
- #endif /* !VIRTIO_BLK_NO_LEGACY */
- /* And this is the final byte of the write scatter-gather list */
- #define VIRTIO_BLK_S_OK 0
- #define VIRTIO_BLK_S_IOERR 1
- #define VIRTIO_BLK_S_UNSUPP 2
- #endif /* _LINUX_VIRTIO_BLK_H */
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