- 根目录:
- include
- scsi
- scsi_cmnd.h
#ifndef _SCSI_SCSI_CMND_H
#define _SCSI_SCSI_CMND_H
#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/scatterlist.h>
struct Scsi_Host;
struct scsi_device;
struct scsi_driver;
#define MAX_COMMAND_SIZE 16
#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
#endif
struct scsi_data_buffer {
struct sg_table table;
unsigned length;
int resid;
};
struct scsi_pointer {
char *ptr;
int this_residual;
struct scatterlist *buffer;
int buffers_residual;
dma_addr_t dma_handle;
volatile int Status;
volatile int Message;
volatile int have_data_in;
volatile int sent_command;
volatile int phase;
};
struct scsi_cmnd {
struct scsi_device *device;
struct list_head list;
struct list_head eh_entry;
struct delayed_work abort_work;
int eh_eflags;
unsigned long serial_number;
unsigned long jiffies_at_alloc;
int retries;
int allowed;
unsigned char prot_op;
unsigned char prot_type;
unsigned short cmd_len;
enum dma_data_direction sc_data_direction;
unsigned char *cmnd;
struct scsi_data_buffer sdb;
struct scsi_data_buffer *prot_sdb;
unsigned underflow;
unsigned transfersize;
struct request *request;
#define SCSI_SENSE_BUFFERSIZE 96
unsigned char *sense_buffer;
void (*scsi_done) (struct scsi_cmnd *);
struct scsi_pointer SCp;
unsigned char *host_scribble;
int result;
unsigned char tag;
};
static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
{
return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
}
extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
struct device *);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
size_t *offset, size_t *len);
extern void scsi_kunmap_atomic_sg(void *virt);
extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
extern void scsi_release_buffers(struct scsi_cmnd *cmd);
extern int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask);
void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd);
static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
{
return cmd->sdb.table.nents;
}
static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
{
return cmd->sdb.table.sgl;
}
static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
{
return cmd->sdb.length;
}
static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
{
cmd->sdb.resid = resid;
}
static inline int scsi_get_resid(struct scsi_cmnd *cmd)
{
return cmd->sdb.resid;
}
#define scsi_for_each_sg(cmd, sg, nseg, __i) \
for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
{
return blk_bidi_rq(cmd->request) &&
(cmd->request->next_rq->special != NULL);
}
static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
{
return scsi_bidi_cmnd(cmd) ?
cmd->request->next_rq->special : &cmd->sdb;
}
static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
{
return &cmd->sdb;
}
static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
void *buf, int buflen)
{
return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
buf, buflen);
}
static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
void *buf, int buflen)
{
return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
buf, buflen);
}
enum scsi_prot_operations {
SCSI_PROT_NORMAL = 0,
SCSI_PROT_READ_INSERT,
SCSI_PROT_WRITE_STRIP,
SCSI_PROT_READ_STRIP,
SCSI_PROT_WRITE_INSERT,
SCSI_PROT_READ_PASS,
SCSI_PROT_WRITE_PASS,
};
static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
{
scmd->prot_op = op;
}
static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
{
return scmd->prot_op;
}
enum scsi_prot_target_type {
SCSI_PROT_DIF_TYPE0 = 0,
SCSI_PROT_DIF_TYPE1,
SCSI_PROT_DIF_TYPE2,
SCSI_PROT_DIF_TYPE3,
};
static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
{
scmd->prot_type = type;
}
static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
{
return scmd->prot_type;
}
static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
{
return blk_rq_pos(scmd->request);
}
static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
{
return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
}
static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
{
return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
}
static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
{
return cmd->prot_sdb;
}
#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
{
cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
}
static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
{
cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
}
static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
{
cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
}
#endif
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