mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-14 00:24:15 +08:00
a586d4f601
Previously we used a type/len pair within the config space, but this seems overkill. We now simply define a structure which represents the layout in the config space: the config space can now only be extended at the end. The main driver-visible changes: 1) We indicate what fields are present with an explicit feature bit. 2) Virtqueues are explicitly numbered, and not in the config space. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#ifndef _LINUX_VIRTIO_BLK_H
|
|
#define _LINUX_VIRTIO_BLK_H
|
|
#include <linux/virtio_config.h>
|
|
|
|
/* The ID for virtio_block */
|
|
#define VIRTIO_ID_BLOCK 2
|
|
|
|
/* Feature bits */
|
|
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
|
|
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
|
|
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
|
|
|
|
struct virtio_blk_config
|
|
{
|
|
/* The capacity (in 512-byte sectors). */
|
|
__le64 capacity;
|
|
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
|
|
__le32 size_max;
|
|
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
|
|
__le32 seg_max;
|
|
} __attribute__((packed));
|
|
|
|
/* These two define direction. */
|
|
#define VIRTIO_BLK_T_IN 0
|
|
#define VIRTIO_BLK_T_OUT 1
|
|
|
|
/* This bit says it's a scsi command, not an actual read or write. */
|
|
#define VIRTIO_BLK_T_SCSI_CMD 2
|
|
|
|
/* Barrier before this op. */
|
|
#define VIRTIO_BLK_T_BARRIER 0x80000000
|
|
|
|
/* This is the first element of the read scatter-gather list. */
|
|
struct virtio_blk_outhdr
|
|
{
|
|
/* VIRTIO_BLK_T* */
|
|
__u32 type;
|
|
/* io priority. */
|
|
__u32 ioprio;
|
|
/* Sector (ie. 512 byte offset) */
|
|
__u64 sector;
|
|
/* Where to put reply. */
|
|
__u64 id;
|
|
};
|
|
|
|
#define VIRTIO_BLK_S_OK 0
|
|
#define VIRTIO_BLK_S_IOERR 1
|
|
#define VIRTIO_BLK_S_UNSUPP 2
|
|
|
|
/* This is the first element of the write scatter-gather list */
|
|
struct virtio_blk_inhdr
|
|
{
|
|
unsigned char status;
|
|
};
|
|
#endif /* _LINUX_VIRTIO_BLK_H */
|