mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 15:12:21 +00:00
f4802209e5
This adds virtio block device driver support. Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/* 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 */
|