189 lines
4.5 KiB
C
189 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
#ifndef __TARGET_CORE_USER_H
|
|
#define __TARGET_CORE_USER_H
|
|
|
|
/* This header will be used by application too */
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/uio.h>
|
|
|
|
#define TCMU_VERSION "2.0"
|
|
|
|
/**
|
|
* DOC: Ring Design
|
|
* Ring Design
|
|
* -----------
|
|
*
|
|
* The mmaped area is divided into three parts:
|
|
* 1) The mailbox (struct tcmu_mailbox, below);
|
|
* 2) The command ring;
|
|
* 3) Everything beyond the command ring (data).
|
|
*
|
|
* The mailbox tells userspace the offset of the command ring from the
|
|
* start of the shared memory region, and how big the command ring is.
|
|
*
|
|
* The kernel passes SCSI commands to userspace by putting a struct
|
|
* tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking
|
|
* userspace via UIO's interrupt mechanism.
|
|
*
|
|
* tcmu_cmd_entry contains a header. If the header type is PAD,
|
|
* userspace should skip hdr->length bytes (mod cmdr_size) to find the
|
|
* next cmd_entry.
|
|
*
|
|
* Otherwise, the entry will contain offsets into the mmaped area that
|
|
* contain the cdb and data buffers -- the latter accessible via the
|
|
* iov array. iov addresses are also offsets into the shared area.
|
|
*
|
|
* When userspace is completed handling the command, set
|
|
* entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate,
|
|
* and also set mailbox->cmd_tail equal to the old cmd_tail plus
|
|
* hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it
|
|
* should process the next packet the same way, and so on.
|
|
*/
|
|
|
|
#define TCMU_MAILBOX_VERSION 2
|
|
#define ALIGN_SIZE 64 /* Should be enough for most CPUs */
|
|
#define TCMU_MAILBOX_FLAG_CAP_OOOC (1 << 0) /* Out-of-order completions */
|
|
#define TCMU_MAILBOX_FLAG_CAP_READ_LEN (1 << 1) /* Read data length */
|
|
#define TCMU_MAILBOX_FLAG_CAP_TMR (1 << 2) /* TMR notifications */
|
|
#define TCMU_MAILBOX_FLAG_CAP_KEEP_BUF (1<<3) /* Keep buf after cmd completion */
|
|
|
|
struct tcmu_mailbox {
|
|
__u16 version;
|
|
__u16 flags;
|
|
__u32 cmdr_off;
|
|
__u32 cmdr_size;
|
|
|
|
__u32 cmd_head;
|
|
|
|
/* Updated by user. On its own cacheline */
|
|
__u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE)));
|
|
|
|
} __packed;
|
|
|
|
enum tcmu_opcode {
|
|
TCMU_OP_PAD = 0,
|
|
TCMU_OP_CMD,
|
|
TCMU_OP_TMR,
|
|
};
|
|
|
|
/*
|
|
* Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode.
|
|
*/
|
|
struct tcmu_cmd_entry_hdr {
|
|
__u32 len_op;
|
|
__u16 cmd_id;
|
|
__u8 kflags;
|
|
#define TCMU_UFLAG_UNKNOWN_OP 0x1
|
|
#define TCMU_UFLAG_READ_LEN 0x2
|
|
#define TCMU_UFLAG_KEEP_BUF 0x4
|
|
__u8 uflags;
|
|
|
|
} __packed;
|
|
|
|
#define TCMU_OP_MASK 0x7
|
|
|
|
static inline enum tcmu_opcode tcmu_hdr_get_op(__u32 len_op)
|
|
{
|
|
return len_op & TCMU_OP_MASK;
|
|
}
|
|
|
|
static inline void tcmu_hdr_set_op(__u32 *len_op, enum tcmu_opcode op)
|
|
{
|
|
*len_op &= ~TCMU_OP_MASK;
|
|
*len_op |= (op & TCMU_OP_MASK);
|
|
}
|
|
|
|
static inline __u32 tcmu_hdr_get_len(__u32 len_op)
|
|
{
|
|
return len_op & ~TCMU_OP_MASK;
|
|
}
|
|
|
|
static inline void tcmu_hdr_set_len(__u32 *len_op, __u32 len)
|
|
{
|
|
*len_op &= TCMU_OP_MASK;
|
|
*len_op |= len;
|
|
}
|
|
|
|
/* Currently the same as SCSI_SENSE_BUFFERSIZE */
|
|
#define TCMU_SENSE_BUFFERSIZE 96
|
|
|
|
struct tcmu_cmd_entry {
|
|
struct tcmu_cmd_entry_hdr hdr;
|
|
|
|
union {
|
|
struct {
|
|
__u32 iov_cnt;
|
|
__u32 iov_bidi_cnt;
|
|
__u32 iov_dif_cnt;
|
|
__u64 cdb_off;
|
|
__u64 __pad1;
|
|
__u64 __pad2;
|
|
__DECLARE_FLEX_ARRAY(struct iovec, iov);
|
|
} req;
|
|
struct {
|
|
__u8 scsi_status;
|
|
__u8 __pad1;
|
|
__u16 __pad2;
|
|
__u32 read_len;
|
|
char sense_buffer[TCMU_SENSE_BUFFERSIZE];
|
|
} rsp;
|
|
};
|
|
|
|
} __packed;
|
|
|
|
struct tcmu_tmr_entry {
|
|
struct tcmu_cmd_entry_hdr hdr;
|
|
|
|
#define TCMU_TMR_UNKNOWN 0
|
|
#define TCMU_TMR_ABORT_TASK 1
|
|
#define TCMU_TMR_ABORT_TASK_SET 2
|
|
#define TCMU_TMR_CLEAR_ACA 3
|
|
#define TCMU_TMR_CLEAR_TASK_SET 4
|
|
#define TCMU_TMR_LUN_RESET 5
|
|
#define TCMU_TMR_TARGET_WARM_RESET 6
|
|
#define TCMU_TMR_TARGET_COLD_RESET 7
|
|
/* Pseudo reset due to received PR OUT */
|
|
#define TCMU_TMR_LUN_RESET_PRO 128
|
|
__u8 tmr_type;
|
|
|
|
__u8 __pad1;
|
|
__u16 __pad2;
|
|
__u32 cmd_cnt;
|
|
__u64 __pad3;
|
|
__u64 __pad4;
|
|
__u16 cmd_ids[];
|
|
} __packed;
|
|
|
|
#define TCMU_OP_ALIGN_SIZE sizeof(__u64)
|
|
|
|
enum tcmu_genl_cmd {
|
|
TCMU_CMD_UNSPEC,
|
|
TCMU_CMD_ADDED_DEVICE,
|
|
TCMU_CMD_REMOVED_DEVICE,
|
|
TCMU_CMD_RECONFIG_DEVICE,
|
|
TCMU_CMD_ADDED_DEVICE_DONE,
|
|
TCMU_CMD_REMOVED_DEVICE_DONE,
|
|
TCMU_CMD_RECONFIG_DEVICE_DONE,
|
|
TCMU_CMD_SET_FEATURES,
|
|
__TCMU_CMD_MAX,
|
|
};
|
|
#define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
|
|
|
|
enum tcmu_genl_attr {
|
|
TCMU_ATTR_UNSPEC,
|
|
TCMU_ATTR_DEVICE,
|
|
TCMU_ATTR_MINOR,
|
|
TCMU_ATTR_PAD,
|
|
TCMU_ATTR_DEV_CFG,
|
|
TCMU_ATTR_DEV_SIZE,
|
|
TCMU_ATTR_WRITECACHE,
|
|
TCMU_ATTR_CMD_STATUS,
|
|
TCMU_ATTR_DEVICE_ID,
|
|
TCMU_ATTR_SUPP_KERN_CMD_REPLY,
|
|
__TCMU_ATTR_MAX,
|
|
};
|
|
#define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)
|
|
|
|
#endif
|