106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-9-16 GuEe-GUI the first version
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* 2021-11-11 GuEe-GUI using virtio common interface
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*/
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#ifndef __VIRTIO_BLK_H__
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#define __VIRTIO_BLK_H__
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#include <rtdef.h>
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#include <virtio.h>
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#define VIRTIO_BLK_QUEUE 0
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#define VIRTIO_BLK_BYTES_PER_SECTOR 512
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#define VIRTIO_BLK_QUEUE_RING_SIZE 4
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#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
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#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
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#define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */
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#define VIRTIO_BLK_F_MQ 12 /* Support more than one vq */
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#define VIRTIO_BLK_T_IN 0 /* Read the blk */
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#define VIRTIO_BLK_T_OUT 1 /* Write the blk */
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#define VIRTIO_BLK_T_SCSI_CMD 2
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#define VIRTIO_BLK_T_SCSI_CMD_OUT 3
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#define VIRTIO_BLK_T_FLUSH 4
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#define VIRTIO_BLK_T_FLUSH_OUT 5
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struct virtio_blk_req
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{
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rt_uint32_t type;
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rt_uint32_t ioprio;
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rt_uint64_t sector;
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};
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struct virtio_blk_config
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{
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rt_uint64_t capacity; /* The capacity (in 512-byte sectors). */
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rt_uint32_t size_max; /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
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rt_uint32_t seg_max; /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
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/* Geometry of the device (if VIRTIO_BLK_F_GEOMETRY) */
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struct virtio_blk_geometry
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{
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rt_uint16_t cylinders;
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rt_uint8_t heads;
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rt_uint8_t sectors;
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} geometry;
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rt_uint32_t blk_size; /* Block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
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struct virtio_blk_topology
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{
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/* # Of logical blocks per physical block (log2) */
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rt_uint8_t physical_block_exp;
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/* Offset of first aligned logical block */
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rt_uint8_t alignment_offset;
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/* Suggested minimum I/O size in blocks */
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rt_uint16_t min_io_size;
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/* Optimal (suggested maximum) I/O size in blocks */
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rt_uint32_t opt_io_size;
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} topology;
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rt_uint8_t writeback;
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rt_uint8_t unused0;
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rt_uint16_t num_queues;
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rt_uint32_t max_discard_sectors;
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rt_uint32_t max_discard_seg;
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rt_uint32_t discard_sector_alignment;
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rt_uint32_t max_write_zeroes_sectors;
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rt_uint32_t max_write_zeroes_seg;
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rt_uint8_t write_zeroes_may_unmap;
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rt_uint8_t unused1[3];
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rt_uint32_t max_secure_erase_sectors;
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rt_uint32_t max_secure_erase_seg;
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rt_uint32_t secure_erase_sector_alignment;
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} __attribute__((packed));
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struct virtio_blk_device
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{
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struct rt_device parent;
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struct virtio_device virtio_dev;
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struct virtio_blk_config *config;
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struct
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{
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rt_bool_t valid;
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rt_uint8_t status;
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struct virtio_blk_req req;
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} info[VIRTIO_BLK_QUEUE_RING_SIZE];
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};
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rt_err_t rt_virtio_blk_init(rt_ubase_t *mmio_base, rt_uint32_t irq);
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#endif /* __VIRTIO_BLK_H__ */
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