mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 07:34:06 +08:00
3875f15207
scripts/headers_install.sh will transform __packed to __attribute__((packed)), so the #ifndef is not necessary. (and, in fact, it's problematic, because we'll end up with the header containing: #ifndef __attribute__((packed)) #define __attribu... and so forth.) Cc: stable@vger.kernel.org # 3.18 Signed-off-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
#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 "1.0"
|
|
|
|
/*
|
|
* 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 1
|
|
#define ALIGN_SIZE 64 /* Should be enough for most CPUs */
|
|
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* Only a few opcodes, and length is 8-byte aligned, so use low bits for opcode.
|
|
*/
|
|
struct tcmu_cmd_entry_hdr {
|
|
__u32 len_op;
|
|
} __packed;
|
|
|
|
#define TCMU_OP_MASK 0x7
|
|
|
|
static inline enum tcmu_opcode tcmu_hdr_get_op(struct tcmu_cmd_entry_hdr *hdr)
|
|
{
|
|
return hdr->len_op & TCMU_OP_MASK;
|
|
}
|
|
|
|
static inline void tcmu_hdr_set_op(struct tcmu_cmd_entry_hdr *hdr, enum tcmu_opcode op)
|
|
{
|
|
hdr->len_op &= ~TCMU_OP_MASK;
|
|
hdr->len_op |= (op & TCMU_OP_MASK);
|
|
}
|
|
|
|
static inline __u32 tcmu_hdr_get_len(struct tcmu_cmd_entry_hdr *hdr)
|
|
{
|
|
return hdr->len_op & ~TCMU_OP_MASK;
|
|
}
|
|
|
|
static inline void tcmu_hdr_set_len(struct tcmu_cmd_entry_hdr *hdr, __u32 len)
|
|
{
|
|
hdr->len_op &= TCMU_OP_MASK;
|
|
hdr->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;
|
|
|
|
uint16_t cmd_id;
|
|
uint16_t __pad1;
|
|
|
|
union {
|
|
struct {
|
|
uint64_t cdb_off;
|
|
uint64_t iov_cnt;
|
|
struct iovec iov[0];
|
|
} req;
|
|
struct {
|
|
uint8_t scsi_status;
|
|
uint8_t __pad1;
|
|
uint16_t __pad2;
|
|
uint32_t __pad3;
|
|
char sense_buffer[TCMU_SENSE_BUFFERSIZE];
|
|
} rsp;
|
|
};
|
|
|
|
} __packed;
|
|
|
|
#define TCMU_OP_ALIGN_SIZE sizeof(uint64_t)
|
|
|
|
enum tcmu_genl_cmd {
|
|
TCMU_CMD_UNSPEC,
|
|
TCMU_CMD_ADDED_DEVICE,
|
|
TCMU_CMD_REMOVED_DEVICE,
|
|
__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_MAX,
|
|
};
|
|
#define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)
|
|
|
|
#endif
|