[mirror_ubuntu-bionic-kernel.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;
};

/* for scmd->flags */
#define SCMD_TAGGED		(1 << 0)

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 */
	int flags;		/* Command flags */

	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);

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
125c99bc CH	56	/* for scmd->flags */
	57	#define SCMD_TAGGED (1 << 0)
	58
1da177e4	59	struct scsi_cmnd {
1da177e4	60	struct scsi_device *device;
1da177e4	61	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	62	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	63	struct delayed_work abort_work;
1da177e4	64	int eh_eflags; /* Used by error handlr */
1da177e4 LT	65
1da177e4 LT	66	/*
c6295cdf TH	67	* A SCSI Command is assigned a nonzero serial_number before passed
	68	* to the driver's queue command function. The serial_number is
	69	* cleared when scsi_done is entered indicating that the command
12a44162 MW	70	* has been completed. It is a bug for LLDDs to use this number
	71	* for purposes other than printk (and even that is only useful
	72	* for debugging).
1da177e4 LT	73	*/
1da177e4 LT	74	unsigned long serial_number;
12a44162	75
b21a4138 JB	76	/*
	77	* This is set to jiffies as it was when the command was first
	78	* allocated. It is used to time how long the command has
	79	* been outstanding
	80	*/
	81	unsigned long jiffies_at_alloc;
1da177e4 LT	82
	83	int retries;
	84	int allowed;
1da177e4	85
db007fc5 MP	86	unsigned char prot_op;
db007fc5 MP	87	unsigned char prot_type;
c611529e	88	unsigned char prot_flags;
db007fc5	89
db4742dd	90	unsigned short cmd_len;
1da177e4	91	enum dma_data_direction sc_data_direction;
1da177e4 LT	92
1da177e4 LT	93	/* These elements define the operation we are about to perform */
64a87b24	94	unsigned char *cmnd;
1da177e4	95
1da177e4 LT	96
1da177e4 LT	97	/* These elements define the operation we ultimately want to perform */
30b0c37b	98	struct scsi_data_buffer sdb;
7027ad72 MP	99	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	100
1da177e4 LT	101	unsigned underflow; /* Return error if less than
1da177e4 LT	102	this amount is transferred */
1da177e4 LT	103
	104	unsigned transfersize; /* How much we are guaranteed to
	105	transfer with each SCSI transfer
	106	(ie, between disconnect /
	107	reconnects. Probably == sector
	108	size */
	109
1da177e4 LT	110	struct request request; / The command we are
	111	working on */
	112
	113	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	114	unsigned char *sense_buffer;
c67a848c MW	115	/* obtained by REQUEST SENSE when
	116	* CHECK CONDITION is received on original
	117	* command (auto-sense) */
1da177e4 LT	118
	119	/* Low-level done function - can be used by low-level driver to point
	120	* to completion function. Not used by mid/upper level code. */
	121	void (scsi_done) (struct scsi_cmnd );
	122
	123	/*
	124	* The following fields can be written to by the host specific code.
	125	* Everything else should be left alone.
	126	*/
	127	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	128
	129	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	130	* call scsi_malloc and get some memory
	131	* and hang it here. The host adapter
	132	* is also expected to call scsi_free
	133	* to release this memory. (The memory
	134	* obtained by scsi_malloc is guaranteed
	135	* to be at an address < 16Mb). */
1da177e4 LT	136
1da177e4 LT	137	int result; /* Status code from lower level driver */
125c99bc	138	int flags; /* Command flags */
1da177e4 LT	139
1da177e4 LT	140	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	141	};
1da177e4 LT	142
b54197c4 CH	143	/*
	144	* Return the driver private allocation behind the command.
	145	* Only works if cmd_size is set in the host template.
	146	*/
	147	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	148	{
	149	return cmd + 1;
	150	}
	151
329a402c	152	/* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
18a4d0a2 MP	153	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	154	{
329a402c	155	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	156	}
18a4d0a2 MP	157
c53033f6	158	extern struct scsi_cmnd scsi_get_command(struct scsi_device , gfp_t);
1da177e4	159	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	160	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	161
cdb8c2a6 GL	162	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	163	size_t offset, size_t len);
	164	extern void scsi_kunmap_atomic_sg(void *virt);
	165
3c356bde	166	extern int scsi_init_io(struct scsi_cmnd *cmd);
b58d9154	167
824d7b57 FT	168	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	169	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	170
30b0c37b BH	171	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	172	{
	173	return cmd->sdb.table.nents;
	174	}
	175
	176	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	177	{
	178	return cmd->sdb.table.sgl;
	179	}
	180
	181	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	182	{
	183	return cmd->sdb.length;
	184	}
824d7b57 FT	185
	186	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	187	{
30b0c37b	188	cmd->sdb.resid = resid;
824d7b57 FT	189	}
	190
	191	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	192	{
30b0c37b	193	return cmd->sdb.resid;
824d7b57 FT	194	}
	195
	196	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	197	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	198
6f9a35e2 BH	199	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	200	{
	201	return blk_bidi_rq(cmd->request) &&
	202	(cmd->request->next_rq->special != NULL);
	203	}
	204
	205	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	206	{
	207	return scsi_bidi_cmnd(cmd) ?
	208	cmd->request->next_rq->special : &cmd->sdb;
	209	}
	210
	211	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	212	{
	213	return &cmd->sdb;
	214	}
	215
9ac16b61 FT	216	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	217	void *buf, int buflen)
	218	{
	219	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	220	buf, buflen);
	221	}
	222
	223	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	224	void *buf, int buflen)
	225	{
	226	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	227	buf, buflen);
	228	}
	229
db007fc5 MP	230	/*
	231	* The operations below are hints that tell the controller driver how
	232	* to handle I/Os with DIF or similar types of protection information.
	233	*/
	234	enum scsi_prot_operations {
	235	/* Normal I/O */
	236	SCSI_PROT_NORMAL = 0,
	237
	238	/* OS-HBA: Protected, HBA-Target: Unprotected */
	239	SCSI_PROT_READ_INSERT,
	240	SCSI_PROT_WRITE_STRIP,
	241
	242	/* OS-HBA: Unprotected, HBA-Target: Protected */
	243	SCSI_PROT_READ_STRIP,
	244	SCSI_PROT_WRITE_INSERT,
	245
	246	/* OS-HBA: Protected, HBA-Target: Protected */
	247	SCSI_PROT_READ_PASS,
	248	SCSI_PROT_WRITE_PASS,
db007fc5 MP	249	};
	250
	251	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	252	{
	253	scmd->prot_op = op;
	254	}
	255
	256	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	257	{
	258	return scmd->prot_op;
	259	}
	260
c611529e MP	261	enum scsi_prot_flags {
	262	SCSI_PROT_TRANSFER_PI = 1 << 0,
	263	SCSI_PROT_GUARD_CHECK = 1 << 1,
	264	SCSI_PROT_REF_CHECK = 1 << 2,
	265	SCSI_PROT_REF_INCREMENT = 1 << 3,
	266	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	267	};
	268
db007fc5 MP	269	/*
	270	* The controller usually does not know anything about the target it
	271	* is communicating with. However, when DIX is enabled the controller
	272	* must be know target type so it can verify the protection
	273	* information passed along with the I/O.
	274	*/
	275	enum scsi_prot_target_type {
	276	SCSI_PROT_DIF_TYPE0 = 0,
	277	SCSI_PROT_DIF_TYPE1,
	278	SCSI_PROT_DIF_TYPE2,
	279	SCSI_PROT_DIF_TYPE3,
	280	};
	281
	282	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	283	{
	284	scmd->prot_type = type;
	285	}
	286
	287	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	288	{
	289	return scmd->prot_type;
	290	}
	291
	292	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	293	{
83096ebf	294	return blk_rq_pos(scmd->request);
db007fc5 MP	295	}
db007fc5 MP	296
c611529e MP	297	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	298	{
	299	return scmd->device->sector_size;
	300	}
	301
	302	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	303	{
	304	return blk_rq_pos(scmd->request) >>
	305	(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
	306	}
	307
7027ad72 MP	308	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	309	{
	310	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	311	}
	312
	313	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	314	{
	315	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	316	}
	317
	318	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	319	{
	320	return cmd->prot_sdb;
	321	}
	322
	323	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	324	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	325
f290f197 JB	326	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	327	{
3384db9e	328	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	329	}
	330
	331	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	332	{
3384db9e	333	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	334	}
	335
	336	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	337	{
3384db9e	338	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	339	}
f290f197 JB	340
8846bab1 SG	341	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	342	{
5616b0a4	343	unsigned int xfer_len = scsi_out(scmd)->length;
c611529e	344	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	345
c611529e MP	346	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	347	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	348
c611529e	349	return xfer_len;
8846bab1 SG	350	}
8846bab1 SG	351
1da177e4	352	#endif /* _SCSI_SCSI_CMND_H */