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Editing: ublk_cmd.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef USER_BLK_DRV_CMD_INC_H #define USER_BLK_DRV_CMD_INC_H #include <linux/types.h> /* ublk server command definition */ /* * Admin commands, issued by ublk server, and handled by ublk driver. */ #define UBLK_CMD_GET_QUEUE_AFFINITY 0x01 #define UBLK_CMD_GET_DEV_INFO 0x02 #define UBLK_CMD_ADD_DEV 0x04 #define UBLK_CMD_DEL_DEV 0x05 #define UBLK_CMD_START_DEV 0x06 #define UBLK_CMD_STOP_DEV 0x07 #define UBLK_CMD_SET_PARAMS 0x08 #define UBLK_CMD_GET_PARAMS 0x09 #define UBLK_CMD_START_USER_RECOVERY 0x10 #define UBLK_CMD_END_USER_RECOVERY 0x11 /* * IO commands, issued by ublk server, and handled by ublk driver. * * FETCH_REQ: issued via sqe(URING_CMD) beforehand for fetching IO request * from ublk driver, should be issued only when starting device. After * the associated cqe is returned, request's tag can be retrieved via * cqe->userdata. * * COMMIT_AND_FETCH_REQ: issued via sqe(URING_CMD) after ublkserver handled * this IO request, request's handling result is committed to ublk * driver, meantime FETCH_REQ is piggyback, and FETCH_REQ has to be * handled before completing io request. * * NEED_GET_DATA: only used for write requests to set io addr and copy data * When NEED_GET_DATA is set, ublksrv has to issue UBLK_IO_NEED_GET_DATA * command after ublk driver returns UBLK_IO_RES_NEED_GET_DATA. * * It is only used if ublksrv set UBLK_F_NEED_GET_DATA flag * while starting a ublk device. */ #define UBLK_IO_FETCH_REQ 0x20 #define UBLK_IO_COMMIT_AND_FETCH_REQ 0x21 #define UBLK_IO_NEED_GET_DATA 0x22 /* only ABORT means that no re-fetch */ #define UBLK_IO_RES_OK 0 #define UBLK_IO_RES_NEED_GET_DATA 1 #define UBLK_IO_RES_ABORT (-ENODEV) #define UBLKSRV_CMD_BUF_OFFSET 0 #define UBLKSRV_IO_BUF_OFFSET 0x80000000 /* tag bit is 12bit, so at most 4096 IOs for each queue */ #define UBLK_MAX_QUEUE_DEPTH 4096 /* * zero copy requires 4k block size, and can remap ublk driver's io * request into ublksrv's vm space */ #define UBLK_F_SUPPORT_ZERO_COPY (1ULL << 0) /* * Force to complete io cmd via io_uring_cmd_complete_in_task so that * performance comparison is done easily with using task_work_add */ #define UBLK_F_URING_CMD_COMP_IN_TASK (1ULL << 1) /* * User should issue io cmd again for write requests to * set io buffer address and copy data from bio vectors * to the userspace io buffer. * * In this mode, task_work is not used. */ #define UBLK_F_NEED_GET_DATA (1UL << 2) #define UBLK_F_USER_RECOVERY (1UL << 3) #define UBLK_F_USER_RECOVERY_REISSUE (1UL << 4) /* device state */ #define UBLK_S_DEV_DEAD 0 #define UBLK_S_DEV_LIVE 1 #define UBLK_S_DEV_QUIESCED 2 /* shipped via sqe->cmd of io_uring command */ struct ublksrv_ctrl_cmd { /* sent to which device, must be valid */ __u32 dev_id; /* sent to which queue, must be -1 if the cmd isn't for queue */ __u16 queue_id; /* * cmd specific buffer, can be IN or OUT. */ __u16 len; __u64 addr; /* __inline__ data */ __u64 data[2]; }; struct ublksrv_ctrl_dev_info { __u16 nr_hw_queues; __u16 queue_depth; __u16 state; __u16 pad0; __u32 max_io_buf_bytes; __u32 dev_id; __s32 ublksrv_pid; __u32 pad1; __u64 flags; /* For ublksrv internal use, invisible to ublk driver */ __u64 ublksrv_flags; __u64 reserved0; __u64 reserved1; __u64 reserved2; }; #define UBLK_IO_OP_READ 0 #define UBLK_IO_OP_WRITE 1 #define UBLK_IO_OP_FLUSH 2 #define UBLK_IO_OP_DISCARD 3 #define UBLK_IO_OP_WRITE_SAME 4 #define UBLK_IO_OP_WRITE_ZEROES 5 #define UBLK_IO_F_FAILFAST_DEV (1U << 8) #define UBLK_IO_F_FAILFAST_TRANSPORT (1U << 9) #define UBLK_IO_F_FAILFAST_DRIVER (1U << 10) #define UBLK_IO_F_META (1U << 11) #define UBLK_IO_F_FUA (1U << 13) #define UBLK_IO_F_NOUNMAP (1U << 15) #define UBLK_IO_F_SWAP (1U << 16) /* * io cmd is described by this structure, and stored in share memory, indexed * by request tag. * * The data is stored by ublk driver, and read by ublksrv after one fetch command * returns. */ struct ublksrv_io_desc { /* op: bit 0-7, flags: bit 8-31 */ __u32 op_flags; __u32 nr_sectors; /* start sector for this io */ __u64 start_sector; /* buffer address in ublksrv daemon vm space, from ublk driver */ __u64 addr; }; static __inline__ __u8 ublksrv_get_op(const struct ublksrv_io_desc *iod) { return iod->op_flags & 0xff; } static __inline__ __u32 ublksrv_get_flags(const struct ublksrv_io_desc *iod) { return iod->op_flags >> 8; } /* issued to ublk driver via /dev/ublkcN */ struct ublksrv_io_cmd { __u16 q_id; /* for fetch/commit which result */ __u16 tag; /* io result, it is valid for COMMIT* command only */ __s32 result; /* * userspace buffer address in ublksrv daemon process, valid for * FETCH* command only */ __u64 addr; }; struct ublk_param_basic { #define UBLK_ATTR_READ_ONLY (1 << 0) #define UBLK_ATTR_ROTATIONAL (1 << 1) #define UBLK_ATTR_VOLATILE_CACHE (1 << 2) #define UBLK_ATTR_FUA (1 << 3) __u32 attrs; __u8 logical_bs_shift; __u8 physical_bs_shift; __u8 io_opt_shift; __u8 io_min_shift; __u32 max_sectors; __u32 chunk_sectors; __u64 dev_sectors; __u64 virt_boundary_mask; }; struct ublk_param_discard { __u32 discard_alignment; __u32 discard_granularity; __u32 max_discard_sectors; __u32 max_write_zeroes_sectors; __u16 max_discard_segments; __u16 reserved0; }; struct ublk_params { /* * Total length of parameters, userspace has to set 'len' for both * SET_PARAMS and GET_PARAMS command, and driver may update len * if two sides use different version of 'ublk_params', same with * 'types' fields. */ __u32 len; #define UBLK_PARAM_TYPE_BASIC (1 << 0) #define UBLK_PARAM_TYPE_DISCARD (1 << 1) __u32 types; /* types of parameter included */ struct ublk_param_basic basic; struct ublk_param_discard discard; }; #endif
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