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>
10 #define __packed __attribute__((packed))
13 #define TCMU_VERSION "1.0"
19 * The mmaped area is divided into three parts:
20 * 1) The mailbox (struct tcmu_mailbox, below)
22 * 3) Everything beyond the command ring (data)
24 * The mailbox tells userspace the offset of the command ring from the
25 * start of the shared memory region, and how big the command ring is.
27 * The kernel passes SCSI commands to userspace by putting a struct
28 * tcmu_cmd_entry in the ring, updating mailbox->cmd_head, and poking
29 * userspace via uio's interrupt mechanism.
31 * tcmu_cmd_entry contains a header. If the header type is PAD,
32 * userspace should skip hdr->length bytes (mod cmdr_size) to find the
35 * Otherwise, the entry will contain offsets into the mmaped area that
36 * contain the cdb and data buffers -- the latter accessible via the
37 * iov array. iov addresses are also offsets into the shared area.
39 * When userspace is completed handling the command, set
40 * entry->rsp.scsi_status, fill in rsp.sense_buffer if appropriate,
41 * and also set mailbox->cmd_tail equal to the old cmd_tail plus
42 * hdr->length, mod cmdr_size. If cmd_tail doesn't equal cmd_head, it
43 * should process the next packet the same way, and so on.
46 #define TCMU_MAILBOX_VERSION 1
47 #define ALIGN_SIZE 64 /* Should be enough for most CPUs */
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_OP_MASK 0x7
76 static inline enum tcmu_opcode tcmu_hdr_get_op(struct tcmu_cmd_entry_hdr *hdr)
78 return hdr->len_op & TCMU_OP_MASK;
81 static inline void tcmu_hdr_set_op(struct tcmu_cmd_entry_hdr *hdr, enum tcmu_opcode op)
83 hdr->len_op &= ~TCMU_OP_MASK;
84 hdr->len_op |= (op & TCMU_OP_MASK);
87 static inline __u32 tcmu_hdr_get_len(struct tcmu_cmd_entry_hdr *hdr)
89 return hdr->len_op & ~TCMU_OP_MASK;
92 static inline void tcmu_hdr_set_len(struct tcmu_cmd_entry_hdr *hdr, __u32 len)
94 hdr->len_op &= TCMU_OP_MASK;
98 /* Currently the same as SCSI_SENSE_BUFFERSIZE */
99 #define TCMU_SENSE_BUFFERSIZE 96
101 struct tcmu_cmd_entry {
102 struct tcmu_cmd_entry_hdr hdr;
118 char sense_buffer[TCMU_SENSE_BUFFERSIZE];
124 #define TCMU_OP_ALIGN_SIZE sizeof(uint64_t)
128 TCMU_CMD_ADDED_DEVICE,
129 TCMU_CMD_REMOVED_DEVICE,
132 #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
134 enum tcmu_genl_attr {
140 #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)