1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __TARGET_CORE_USER_H
3 #define __TARGET_CORE_USER_H
5 /* This header will be used by application too */
7 #include <linux/types.h>
10 #define TCMU_VERSION "2.0"
17 * The mmaped area is divided into three parts:
18 * 1) The mailbox (struct tcmu_mailbox, below);
19 * 2) The command ring;
20 * 3) Everything beyond the command ring (data).
22 * The mailbox tells userspace the offset of the command ring from the
23 * start of the shared memory region, and how big the command ring is.
25 * The kernel passes SCSI commands to userspace by putting a struct
26 * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking
27 * userspace via UIO's interrupt mechanism.
29 * tcmu_cmd_entry contains a header. If the header type is PAD,
30 * userspace should skip hdr->length bytes (mod cmdr_size) to find the
33 * Otherwise, the entry will contain offsets into the mmaped area that
34 * contain the cdb and data buffers -- the latter accessible via the
35 * iov array. iov addresses are also offsets into the shared area.
37 * When userspace is completed handling the command, set
38 * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate,
39 * and also set mailbox->cmd_tail equal to the old cmd_tail plus
40 * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it
41 * should process the next packet the same way, and so on.
44 #define TCMU_MAILBOX_VERSION 2
45 #define ALIGN_SIZE 64 /* Should be enough for most CPUs */
46 #define TCMU_MAILBOX_FLAG_CAP_OOOC (1 << 0) /* Out-of-order completions */
47 #define TCMU_MAILBOX_FLAG_CAP_READ_LEN (1 << 1) /* Read data length */
57 /* Updated by user. On its own cacheline */
58 __u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE)));
68 * Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode.
70 struct tcmu_cmd_entry_hdr {
74 #define TCMU_UFLAG_UNKNOWN_OP 0x1
75 #define TCMU_UFLAG_READ_LEN 0x2
80 #define TCMU_OP_MASK 0x7
82 static inline enum tcmu_opcode tcmu_hdr_get_op(__u32 len_op)
84 return len_op & TCMU_OP_MASK;
87 static inline void tcmu_hdr_set_op(__u32 *len_op, enum tcmu_opcode op)
89 *len_op &= ~TCMU_OP_MASK;
90 *len_op |= (op & TCMU_OP_MASK);
93 static inline __u32 tcmu_hdr_get_len(__u32 len_op)
95 return len_op & ~TCMU_OP_MASK;
98 static inline void tcmu_hdr_set_len(__u32 *len_op, __u32 len)
100 *len_op &= TCMU_OP_MASK;
104 /* Currently the same as SCSI_SENSE_BUFFERSIZE */
105 #define TCMU_SENSE_BUFFERSIZE 96
107 struct tcmu_cmd_entry {
108 struct tcmu_cmd_entry_hdr hdr;
125 char sense_buffer[TCMU_SENSE_BUFFERSIZE];
131 #define TCMU_OP_ALIGN_SIZE sizeof(__u64)
135 TCMU_CMD_ADDED_DEVICE,
136 TCMU_CMD_REMOVED_DEVICE,
137 TCMU_CMD_RECONFIG_DEVICE,
138 TCMU_CMD_ADDED_DEVICE_DONE,
139 TCMU_CMD_REMOVED_DEVICE_DONE,
140 TCMU_CMD_RECONFIG_DEVICE_DONE,
141 TCMU_CMD_SET_FEATURES,
144 #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
146 enum tcmu_genl_attr {
153 TCMU_ATTR_WRITECACHE,
154 TCMU_ATTR_CMD_STATUS,
156 TCMU_ATTR_SUPP_KERN_CMD_REPLY,
159 #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)