1 #ifndef __TARGET_CORE_USER_H
2 #define __TARGET_CORE_USER_H
4 /* This header will be used by application too */
6 #include <linux/types.h>
9 #define TCMU_VERSION "1.0"
15 * The mmaped area is divided into three parts:
16 * 1) The mailbox (struct tcmu_mailbox, below)
18 * 3) Everything beyond the command ring (data)
20 * The mailbox tells userspace the offset of the command ring from the
21 * start of the shared memory region, and how big the command ring is.
23 * The kernel passes SCSI commands to userspace by putting a struct
24 * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking
25 * userspace via uio's interrupt mechanism.
27 * tcmu_cmd_entry contains a header. If the header type is PAD,
28 * userspace should skip hdr->length bytes (mod cmdr_size) to find the
31 * Otherwise, the entry will contain offsets into the mmaped area that
32 * contain the cdb and data buffers -- the latter accessible via the
33 * iov array. iov addresses are also offsets into the shared area.
35 * When userspace is completed handling the command, set
36 * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate,
37 * and also set mailbox->cmd_tail equal to the old cmd_tail plus
38 * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it
39 * should process the next packet the same way, and so on.
42 #define TCMU_MAILBOX_VERSION 1
43 #define ALIGN_SIZE 64 /* Should be enough for most CPUs */
53 /* Updated by user. On its own cacheline */
54 __u32 cmd_tail __attribute__((__aligned__(ALIGN_SIZE)));
64 * Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode.
66 struct tcmu_cmd_entry_hdr {
70 #define TCMU_OP_MASK 0x7
72 static inline enum tcmu_opcode tcmu_hdr_get_op(struct tcmu_cmd_entry_hdr *hdr)
74 return hdr->len_op & TCMU_OP_MASK;
77 static inline void tcmu_hdr_set_op(struct tcmu_cmd_entry_hdr *hdr, enum tcmu_opcode op)
79 hdr->len_op &= ~TCMU_OP_MASK;
80 hdr->len_op |= (op & TCMU_OP_MASK);
83 static inline __u32 tcmu_hdr_get_len(struct tcmu_cmd_entry_hdr *hdr)
85 return hdr->len_op & ~TCMU_OP_MASK;
88 static inline void tcmu_hdr_set_len(struct tcmu_cmd_entry_hdr *hdr, __u32 len)
90 hdr->len_op &= TCMU_OP_MASK;
94 /* Currently the same as SCSI_SENSE_BUFFERSIZE */
95 #define TCMU_SENSE_BUFFERSIZE 96
97 struct tcmu_cmd_entry {
98 struct tcmu_cmd_entry_hdr hdr;
114 char sense_buffer[TCMU_SENSE_BUFFERSIZE];
120 #define TCMU_OP_ALIGN_SIZE sizeof(uint64_t)
124 TCMU_CMD_ADDED_DEVICE,
125 TCMU_CMD_REMOVED_DEVICE,
128 #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
130 enum tcmu_genl_attr {
136 #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)