[deliverable/linux.git] / 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>
#include <scsi/scsi_device.h>

struct Scsi_Host;
struct scsi_driver;

#include <scsi/scsi_device.h>

/*
 * MAX_COMMAND_SIZE is:
 * 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
 */
#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;
};

/* 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 */
	struct delayed_work abort_work;
	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 char prot_flags;

	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 */

#define SCSI_SENSE_BUFFERSIZE 	96
	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 */
};

/*
 * Return the driver private allocation behind the command.
 * Only works if cmd_size is set in the host template.
 */
static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
{
	return cmd + 1;
}

/* 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 void scsi_put_command(struct scsi_cmnd *);
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 int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(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 */
	SCSI_PROT_NORMAL = 0,

	/* OS-HBA: Protected, HBA-Target: Unprotected */
	SCSI_PROT_READ_INSERT,
	SCSI_PROT_WRITE_STRIP,

	/* OS-HBA: Unprotected, HBA-Target: Protected */
	SCSI_PROT_READ_STRIP,
	SCSI_PROT_WRITE_INSERT,

	/* OS-HBA: Protected, HBA-Target: Protected */
	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_flags {
	SCSI_PROT_TRANSFER_PI		= 1 << 0,
	SCSI_PROT_GUARD_CHECK		= 1 << 1,
	SCSI_PROT_REF_CHECK		= 1 << 2,
	SCSI_PROT_REF_INCREMENT		= 1 << 3,
	SCSI_PROT_IP_CHECKSUM		= 1 << 4,
};

/*
 * 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 {
	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 int scsi_prot_interval(struct scsi_cmnd *scmd)
{
	return scmd->device->sector_size;
}

static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
{
	return blk_rq_pos(scmd->request) >>
		(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
}

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);
}

static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
{
	unsigned int xfer_len = scsi_out(scmd)->length;
	unsigned int prot_interval = scsi_prot_interval(scmd);

	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
		xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;

	return xfer_len;
}

#endif /* _SCSI_SCSI_CMND_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _SCSI_SCSI_CMND_H
	2	#define _SCSI_SCSI_CMND_H
	3
	4	#include <linux/dma-mapping.h>
6f9a35e2	5	#include <linux/blkdev.h>
1da177e4 LT	6	#include <linux/list.h>
1da177e4 LT	7	#include <linux/types.h>
4e57b681	8	#include <linux/timer.h>
c6132da1	9	#include <linux/scatterlist.h>
8846bab1	10	#include <scsi/scsi_device.h>
1da177e4	11
b58d9154	12	struct Scsi_Host;
18a4d0a2	13	struct scsi_driver;
1da177e4	14
c611529e MP	15	#include <scsi/scsi_device.h>
c611529e MP	16
64a87b24 BH	17	/*
	18	* MAX_COMMAND_SIZE is:
	19	* The longest fixed-length SCSI CDB as per the SCSI standard.
	20	* fixed-length means: commands that their size can be determined
	21	* by their opcode and the CDB does not carry a length specifier, (unlike
	22	* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
	23	* true and the SCSI standard also defines extended commands and
	24	* vendor specific commands that can be bigger than 16 bytes. The kernel
	25	* will support these using the same infrastructure used for VARLEN CDB's.
	26	* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
	27	* supports without specifying a cmd_len by ULD's
	28	*/
	29	#define MAX_COMMAND_SIZE 16
	30	#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
	31	# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
	32	#endif
	33
30b0c37b BH	34	struct scsi_data_buffer {
	35	struct sg_table table;
	36	unsigned length;
	37	int resid;
	38	};
1da177e4 LT	39
	40	/* embedded in scsi_cmnd */
	41	struct scsi_pointer {
	42	char ptr; / data pointer */
	43	int this_residual; /* left in this buffer */
	44	struct scatterlist buffer; / which buffer */
	45	int buffers_residual; /* how many buffers left */
	46
	47	dma_addr_t dma_handle;
	48
	49	volatile int Status;
	50	volatile int Message;
	51	volatile int have_data_in;
	52	volatile int sent_command;
	53	volatile int phase;
	54	};
	55
	56	struct scsi_cmnd {
1da177e4	57	struct scsi_device *device;
1da177e4	58	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	59	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	60	struct delayed_work abort_work;
1da177e4	61	int eh_eflags; /* Used by error handlr */
1da177e4 LT	62
1da177e4 LT	63	/*
c6295cdf	64	* A SCSI Command is assigned a nonzero serial_number before passed
	65	* to the driver's queue command function. The serial_number is
	66	* cleared when scsi_done is entered indicating that the command
12a44162 MW	67	* has been completed. It is a bug for LLDDs to use this number
	68	* for purposes other than printk (and even that is only useful
	69	* for debugging).
1da177e4 LT	70	*/
1da177e4 LT	71	unsigned long serial_number;
12a44162	72
b21a4138 JB	73	/*
	74	* This is set to jiffies as it was when the command was first
	75	* allocated. It is used to time how long the command has
	76	* been outstanding
	77	*/
	78	unsigned long jiffies_at_alloc;
1da177e4 LT	79
	80	int retries;
	81	int allowed;
1da177e4	82
db007fc5 MP	83	unsigned char prot_op;
db007fc5 MP	84	unsigned char prot_type;
c611529e	85	unsigned char prot_flags;
db007fc5	86
db4742dd	87	unsigned short cmd_len;
1da177e4	88	enum dma_data_direction sc_data_direction;
1da177e4 LT	89
1da177e4 LT	90	/* These elements define the operation we are about to perform */
64a87b24	91	unsigned char *cmnd;
1da177e4	92
1da177e4 LT	93
1da177e4 LT	94	/* These elements define the operation we ultimately want to perform */
30b0c37b	95	struct scsi_data_buffer sdb;
7027ad72 MP	96	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	97
1da177e4 LT	98	unsigned underflow; /* Return error if less than
1da177e4 LT	99	this amount is transferred */
1da177e4 LT	100
	101	unsigned transfersize; /* How much we are guaranteed to
	102	transfer with each SCSI transfer
	103	(ie, between disconnect /
	104	reconnects. Probably == sector
	105	size */
	106
1da177e4 LT	107	struct request request; / The command we are
	108	working on */
	109
	110	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	111	unsigned char *sense_buffer;
c67a848c MW	112	/* obtained by REQUEST SENSE when
	113	* CHECK CONDITION is received on original
	114	* command (auto-sense) */
1da177e4 LT	115
	116	/* Low-level done function - can be used by low-level driver to point
	117	* to completion function. Not used by mid/upper level code. */
	118	void (scsi_done) (struct scsi_cmnd );
	119
	120	/*
	121	* The following fields can be written to by the host specific code.
	122	* Everything else should be left alone.
	123	*/
	124	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	125
	126	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	127	* call scsi_malloc and get some memory
	128	* and hang it here. The host adapter
	129	* is also expected to call scsi_free
	130	* to release this memory. (The memory
	131	* obtained by scsi_malloc is guaranteed
	132	* to be at an address < 16Mb). */
1da177e4 LT	133
	134	int result; /* Status code from lower level driver */
	135
	136	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	137	};
1da177e4 LT	138
b54197c4 CH	139	/*
	140	* Return the driver private allocation behind the command.
	141	* Only works if cmd_size is set in the host template.
	142	*/
	143	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	144	{
	145	return cmd + 1;
	146	}
	147
329a402c	148	/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
18a4d0a2 MP	149	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	150	{
329a402c	151	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	152	}
18a4d0a2 MP	153
c53033f6	154	extern struct scsi_cmnd scsi_get_command(struct scsi_device , gfp_t);
1da177e4	155	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	156	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	157
cdb8c2a6 GL	158	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	159	size_t offset, size_t len);
	160	extern void scsi_kunmap_atomic_sg(void *virt);
	161
bb52d82f	162	extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
b58d9154	163
824d7b57 FT	164	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	165	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	166
30b0c37b BH	167	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	168	{
	169	return cmd->sdb.table.nents;
	170	}
	171
	172	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	173	{
	174	return cmd->sdb.table.sgl;
	175	}
	176
	177	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	178	{
	179	return cmd->sdb.length;
	180	}
824d7b57 FT	181
	182	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	183	{
30b0c37b	184	cmd->sdb.resid = resid;
824d7b57 FT	185	}
	186
	187	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	188	{
30b0c37b	189	return cmd->sdb.resid;
824d7b57 FT	190	}
	191
	192	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	193	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	194
6f9a35e2 BH	195	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	196	{
	197	return blk_bidi_rq(cmd->request) &&
	198	(cmd->request->next_rq->special != NULL);
	199	}
	200
	201	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	202	{
	203	return scsi_bidi_cmnd(cmd) ?
	204	cmd->request->next_rq->special : &cmd->sdb;
	205	}
	206
	207	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	208	{
	209	return &cmd->sdb;
	210	}
	211
9ac16b61 FT	212	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	213	void *buf, int buflen)
	214	{
	215	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	216	buf, buflen);
	217	}
	218
	219	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	220	void *buf, int buflen)
	221	{
	222	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	223	buf, buflen);
	224	}
	225
db007fc5 MP	226	/*
	227	* The operations below are hints that tell the controller driver how
	228	* to handle I/Os with DIF or similar types of protection information.
	229	*/
	230	enum scsi_prot_operations {
	231	/* Normal I/O */
	232	SCSI_PROT_NORMAL = 0,
	233
	234	/* OS-HBA: Protected, HBA-Target: Unprotected */
	235	SCSI_PROT_READ_INSERT,
	236	SCSI_PROT_WRITE_STRIP,
	237
	238	/* OS-HBA: Unprotected, HBA-Target: Protected */
	239	SCSI_PROT_READ_STRIP,
	240	SCSI_PROT_WRITE_INSERT,
	241
	242	/* OS-HBA: Protected, HBA-Target: Protected */
	243	SCSI_PROT_READ_PASS,
	244	SCSI_PROT_WRITE_PASS,
db007fc5 MP	245	};
	246
	247	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	248	{
	249	scmd->prot_op = op;
	250	}
	251
	252	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	253	{
	254	return scmd->prot_op;
	255	}
	256
c611529e MP	257	enum scsi_prot_flags {
	258	SCSI_PROT_TRANSFER_PI = 1 << 0,
	259	SCSI_PROT_GUARD_CHECK = 1 << 1,
	260	SCSI_PROT_REF_CHECK = 1 << 2,
	261	SCSI_PROT_REF_INCREMENT = 1 << 3,
	262	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	263	};
	264
db007fc5 MP	265	/*
	266	* The controller usually does not know anything about the target it
	267	* is communicating with. However, when DIX is enabled the controller
	268	* must be know target type so it can verify the protection
	269	* information passed along with the I/O.
	270	*/
	271	enum scsi_prot_target_type {
	272	SCSI_PROT_DIF_TYPE0 = 0,
	273	SCSI_PROT_DIF_TYPE1,
	274	SCSI_PROT_DIF_TYPE2,
	275	SCSI_PROT_DIF_TYPE3,
	276	};
	277
	278	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	279	{
	280	scmd->prot_type = type;
	281	}
	282
	283	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	284	{
	285	return scmd->prot_type;
	286	}
	287
	288	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	289	{
83096ebf	290	return blk_rq_pos(scmd->request);
db007fc5 MP	291	}
db007fc5 MP	292
c611529e MP	293	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	294	{
	295	return scmd->device->sector_size;
	296	}
	297
	298	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	299	{
	300	return blk_rq_pos(scmd->request) >>
	301	(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
	302	}
	303
7027ad72 MP	304	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	305	{
	306	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	307	}
	308
	309	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	310	{
	311	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	312	}
	313
	314	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	315	{
	316	return cmd->prot_sdb;
	317	}
	318
	319	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	320	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	321
f290f197 JB	322	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	323	{
3384db9e	324	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	325	}
	326
	327	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	328	{
3384db9e	329	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	330	}
	331
	332	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	333	{
3384db9e	334	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	335	}
f290f197 JB	336
8846bab1 SG	337	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	338	{
5616b0a4	339	unsigned int xfer_len = scsi_out(scmd)->length;
c611529e	340	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	341
c611529e MP	342	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	343	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	344
c611529e	345	return xfer_len;
8846bab1 SG	346	}
8846bab1 SG	347
1da177e4	348	#endif /* _SCSI_SCSI_CMND_H */