int megaraid_io_interface(int device, int target, struct scsi_cmnd_io *, int);

#undef u32

#define u8  uint8_t
#define u16 uint16_t
#define u32 uint32_t
#define u64 uint64_t

/*======================================================
* PERC2/3/4 Passthrough SCSI Command Interface
*
* Contents from:
*  drivers/scsi/megaraid/megaraid_ioctl.h
*  drivers/scsi/megaraid/mbox_defs.h
*======================================================*/
#define MEGAIOC_MAGIC   'm'
#define MEGAIOCCMD      _IOWR(MEGAIOC_MAGIC, 0, struct uioctl_t)

/* Following subopcode work for opcode == 0x82 */
#define MKADAP(adapno)   (MEGAIOC_MAGIC << 8 | adapno)
#define MEGAIOC_QNADAP     'm'
#define MEGAIOC_QDRVRVER   'e'
#define MEGAIOC_QADAPINFO  'g'

#define MEGA_MBOXCMD_PASSTHRU 0x03

#define MAX_REQ_SENSE_LEN  0x20
#define MAX_CDB_LEN 10

typedef struct
{
  uint8_t  timeout : 3;
  uint8_t  ars : 1;
  uint8_t  reserved : 3;
  uint8_t  islogical : 1;
  uint8_t  logdrv;
  uint8_t  channel;
  uint8_t  target;
  uint8_t  queuetag;
  uint8_t  queueaction;
  uint8_t  cdb[MAX_CDB_LEN];
  uint8_t  cdblen;
  uint8_t  reqsenselen;
  uint8_t  reqsensearea[MAX_REQ_SENSE_LEN];
  uint8_t  numsgelements;
  uint8_t  scsistatus;
  uint32_t dataxferaddr;
  uint32_t dataxferlen;
} __attribute__((packed)) mega_passthru;

typedef struct
{
  uint8_t   cmd;
  uint8_t   cmdid;
  uint8_t   opcode;
  uint8_t   subopcode;
  uint32_t  lba;
  uint32_t  xferaddr;
  uint8_t   logdrv;
  uint8_t   resvd[3];
  uint8_t   numstatus;
  uint8_t   status;
} __attribute__((packed)) megacmd_t;

typedef union {
  uint8_t   *pointer;
  uint8_t    pad[8];
} ptr_t;

// The above definition assumes sizeof(void*) <= 8.
// This assumption also exists in the linux megaraid device driver.
// So define a macro to check expected size of ptr_t at compile time using
// a dummy typedef.  On size mismatch, compiler reports a negative array
// size.  If you see an error message of this form, it means that
// you have an unexpected pointer size on your platform and can not
// use megaraid support in smartmontools.
typedef char assert_sizeof_ptr_t[sizeof(ptr_t) == 8 ? 1 : -1];

struct uioctl_t
{
  uint32_t       inlen;
  uint32_t       outlen;
  union {
    uint8_t      fca[16];
    struct {
      uint8_t  opcode;
      uint8_t  subopcode;
      uint16_t adapno;
      ptr_t    buffer;
      uint32_t length;
    } __attribute__((packed)) fcs;
  } __attribute__((packed)) ui;
  
  megacmd_t     mbox;
  mega_passthru pthru;
  ptr_t         data;
} __attribute__((packed));

/*===================================================
* PERC5/6 Passthrough SCSI Command Interface
*
* Contents from:
*  drivers/scsi/megaraid/megaraid_sas.h
*===================================================*/
#define MEGASAS_MAGIC          'M'
#define MEGASAS_IOC_FIRMWARE   _IOWR(MEGASAS_MAGIC, 1, struct megasas_iocpacket)

#define MFI_CMD_PD_SCSI_IO        0x04
#define MFI_CMD_DCMD              0x05
#define MFI_FRAME_SGL64           0x02
#define MFI_STAT_OK               0x00
#define MFI_DCMD_PD_GET_LIST      0x02010000
/*
* Number of mailbox bytes in DCMD message frame
*/
#define MFI_MBOX_SIZE             12
#define MAX_IOCTL_SGE             16
#define MFI_FRAME_DIR_NONE        0x0000
#define MFI_FRAME_DIR_WRITE       0x0008
#define MFI_FRAME_DIR_READ        0x0010
#define MFI_FRAME_DIR_BOTH        0x0018

#define MAX_SYS_PDS               240

struct megasas_sge32 {
  
  u32 phys_addr;
  u32 length;
  
} __attribute__ ((packed));

struct megasas_sge64 {
  
  u64 phys_addr;
  u32 length;
  
} __attribute__ ((packed));

union megasas_sgl {
  
  struct megasas_sge32 sge32[1];
  struct megasas_sge64 sge64[1];
  
} __attribute__ ((packed));

struct megasas_header {
  
  u8 cmd;           /*00h */
  u8 sense_len;     /*01h */
  u8 cmd_status;    /*02h */
  u8 scsi_status;   /*03h */
  
  u8 target_id;     /*04h */
  u8 lun;           /*05h */
  u8 cdb_len;       /*06h */
  u8 sge_count;     /*07h */
  
  u32 context;      /*08h */
  u32 pad_0;        /*0Ch */
  
  u16 flags;        /*10h */
  u16 timeout;      /*12h */
  u32 data_xferlen; /*14h */
  
} __attribute__ ((packed));

struct megasas_pthru_frame {
  
  u8 cmd;            /*00h */
  u8 sense_len;      /*01h */
  u8 cmd_status;     /*02h */
  u8 scsi_status;    /*03h */
  
  u8 target_id;      /*04h */
  u8 lun;            /*05h */
  u8 cdb_len;        /*06h */
  u8 sge_count;      /*07h */
  
  u32 context;       /*08h */
  u32 pad_0;         /*0Ch */
  
  u16 flags;         /*10h */
  u16 timeout;       /*12h */
  u32 data_xfer_len; /*14h */
  
  u32 sense_buf_phys_addr_lo; /*18h */
  u32 sense_buf_phys_addr_hi; /*1Ch */
  
  u8 cdb[16];            /*20h */
  union megasas_sgl sgl; /*30h */
  
} __attribute__ ((packed));

struct megasas_dcmd_frame {
  
  u8 cmd;            /*00h */
  u8 reserved_0;     /*01h */
  u8 cmd_status;     /*02h */
  u8 reserved_1[4];  /*03h */
  u8 sge_count;      /*07h */
  
  u32 context;       /*08h */
  u32 pad_0;         /*0Ch */
  
  u16 flags;         /*10h */
  u16 timeout;  /*12h */
  
  u32 data_xfer_len; /*14h */
  u32 opcode;  /*18h */
  
  union {   /*1Ch */
    u8 b[12];
    u16 s[6];
    u32 w[3];
  } mbox;
  
  union megasas_sgl sgl; /*28h */
  
} __attribute__ ((packed));

struct megasas_iocpacket {
  u16 host_no;
  u16 __pad1;
  u32 sgl_off;
  u32 sge_count;
  u32 sense_off;
  u32 sense_len;
  union {
    u8 raw[128];
    struct megasas_header hdr;
    struct megasas_pthru_frame pthru;
    struct megasas_dcmd_frame dcmd;
  } frame;
  
  struct iovec sgl[MAX_IOCTL_SGE];
} __attribute__ ((packed));

struct megasas_pd_address {
  u16 device_id;
  u16 encl_device_id;
  u8 encl_index;
  u8 slot_number;
  u8 scsi_dev_type; /* 0 = disk */
  u8 connect_port_bitmap;
  u64 sas_addr[2];
}   __attribute__ ((packed));

struct megasas_pd_list {
  u32 size;
  u32 count;
  struct megasas_pd_address addr[MAX_SYS_PDS];
} __attribute__ ((packed));

#undef u8
#undef u16
#undef u32
#undef u64