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 "2.0"
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 2
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_UFLAG_UNKNOWN_OP 0x1
75 #define TCMU_OP_MASK 0x7
77 static inline enum tcmu_opcode
tcmu_hdr_get_op(__u32 len_op
)
79 return len_op
& TCMU_OP_MASK
;
82 static inline void tcmu_hdr_set_op(__u32
*len_op
, enum tcmu_opcode op
)
84 *len_op
&= ~TCMU_OP_MASK
;
85 *len_op
|= (op
& TCMU_OP_MASK
);
88 static inline __u32
tcmu_hdr_get_len(__u32 len_op
)
90 return len_op
& ~TCMU_OP_MASK
;
93 static inline void tcmu_hdr_set_len(__u32
*len_op
, __u32 len
)
95 *len_op
&= TCMU_OP_MASK
;
99 /* Currently the same as SCSI_SENSE_BUFFERSIZE */
100 #define TCMU_SENSE_BUFFERSIZE 96
102 struct tcmu_cmd_entry
{
103 struct tcmu_cmd_entry_hdr hdr
;
108 uint32_t iov_bidi_cnt
;
109 uint32_t iov_dif_cnt
;
120 char sense_buffer
[TCMU_SENSE_BUFFERSIZE
];
126 #define TCMU_OP_ALIGN_SIZE sizeof(uint64_t)
130 TCMU_CMD_ADDED_DEVICE
,
131 TCMU_CMD_REMOVED_DEVICE
,
134 #define TCMU_CMD_MAX (__TCMU_CMD_MAX - 1)
136 enum tcmu_genl_attr
{
142 #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)
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