blob: de5f5d8f1f8a9b84e6b7306b51ac02e75821533f [file] [log] [blame]
#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;
* The longest fixed-length SCSI CDB as per the SCSI standard.
* fixed-length means: commands that their size can be determined
* by their opcode and the CDB does not carry a length specifier, (unlike
* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
* true and the SCSI standard also defines extended commands and
* vendor specific commands that can be bigger than 16 bytes. The kernel
* will support these using the same infrastructure used for VARLEN CDB's.
* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
* supports without specifying a cmd_len by ULD's
# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
struct scsi_data_buffer {
struct sg_table table;
unsigned length;
int resid;
/* embedded in scsi_cmnd */
struct scsi_pointer {
char *ptr; /* data pointer */
int this_residual; /* left in this buffer */
struct scatterlist *buffer; /* which buffer */
int buffers_residual; /* how many buffers left */
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; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
int eh_eflags; /* Used by error handlr */
* A SCSI Command is assigned a nonzero serial_number before passed
* to the driver's queue command function. The serial_number is
* cleared when scsi_done is entered indicating that the command
* has been completed. It is a bug for LLDDs to use this number
* for purposes other than printk (and even that is only useful
* for debugging).
unsigned long serial_number;
* This is set to jiffies as it was when the command was first
* allocated. It is used to time how long the command has
* been outstanding
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;
/* These elements define the operation we are about to perform */
unsigned char *cmnd;
/* These elements define the operation we ultimately want to perform */
struct scsi_data_buffer sdb;
struct scsi_data_buffer *prot_sdb;
unsigned underflow; /* Return error if less than
this amount is transferred */
unsigned transfersize; /* How much we are guaranteed to
transfer with each SCSI transfer
(ie, between disconnect /
reconnects. Probably == sector
size */
struct request *request; /* The command we are
working on */
unsigned char *sense_buffer;
/* obtained by REQUEST SENSE when
* CHECK CONDITION is received on original
* command (auto-sense) */
/* Low-level done function - can be used by low-level driver to point
* to completion function. Not used by mid/upper level code. */
void (*scsi_done) (struct scsi_cmnd *);
* The following fields can be written to by the host specific code.
* Everything else should be left alone.
struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
unsigned char *host_scribble; /* The host adapter is allowed to
* call scsi_malloc and get some memory
* and hang it here. The host adapter
* is also expected to call scsi_free
* to release this memory. (The memory
* obtained by scsi_malloc is guaranteed
* to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
unsigned char tag; /* SCSI-II queued command tag */
/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
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);
* The operations below are hints that tell the controller driver how
* to handle I/Os with DIF or similar types of protection information.
enum scsi_prot_operations {
/* Normal I/O */
/* OS-HBA: Protected, HBA-Target: Unprotected */
/* OS-HBA: Unprotected, HBA-Target: Protected */
/* OS-HBA: Protected, HBA-Target: Protected */
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;
* The controller usually does not know anything about the target it
* is communicating with. However, when DIX is enabled the controller
* must be know target type so it can verify the protection
* information passed along with the I/O.
enum scsi_prot_target_type {
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 /* _SCSI_SCSI_CMND_H */