[mirror_ubuntu-artful-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>
#include <scsi/scsi_request.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)
#define SCMD_UNCHECKED_ISA_DMA	(1 << 1)
#define SCMD_ZONE_WRITE_LOCK	(1 << 2)

struct scsi_cmnd {
	struct scsi_request req;
	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 passthrough 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 void scsi_initialize_rq(struct request *rq);

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>
82ed4db4	11	#include <scsi/scsi_request.h>
1da177e4	12
b58d9154	13	struct Scsi_Host;
18a4d0a2	14	struct scsi_driver;
1da177e4	15
c611529e MP	16	#include <scsi/scsi_device.h>
c611529e MP	17
64a87b24 BH	18	/*
	19	* MAX_COMMAND_SIZE is:
	20	* The longest fixed-length SCSI CDB as per the SCSI standard.
	21	* fixed-length means: commands that their size can be determined
	22	* by their opcode and the CDB does not carry a length specifier, (unlike
	23	* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
	24	* true and the SCSI standard also defines extended commands and
	25	* vendor specific commands that can be bigger than 16 bytes. The kernel
	26	* will support these using the same infrastructure used for VARLEN CDB's.
	27	* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
	28	* supports without specifying a cmd_len by ULD's
	29	*/
	30	#define MAX_COMMAND_SIZE 16
	31	#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
	32	# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
	33	#endif
	34
30b0c37b BH	35	struct scsi_data_buffer {
	36	struct sg_table table;
	37	unsigned length;
	38	int resid;
	39	};
1da177e4 LT	40
	41	/* embedded in scsi_cmnd */
	42	struct scsi_pointer {
	43	char ptr; / data pointer */
	44	int this_residual; /* left in this buffer */
	45	struct scatterlist buffer; / which buffer */
	46	int buffers_residual; /* how many buffers left */
	47
	48	dma_addr_t dma_handle;
	49
	50	volatile int Status;
	51	volatile int Message;
	52	volatile int have_data_in;
	53	volatile int sent_command;
	54	volatile int phase;
	55	};
	56
125c99bc CH	57	/* for scmd->flags */
125c99bc CH	58	#define SCMD_TAGGED (1 << 0)
8e688254	59	#define SCMD_UNCHECKED_ISA_DMA (1 << 1)
70e42fd0	60	#define SCMD_ZONE_WRITE_LOCK (1 << 2)
125c99bc	61
1da177e4	62	struct scsi_cmnd {
82ed4db4	63	struct scsi_request req;
1da177e4	64	struct scsi_device *device;
1da177e4	65	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	66	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	67	struct delayed_work abort_work;
1da177e4	68	int eh_eflags; /* Used by error handlr */
1da177e4 LT	69
1da177e4 LT	70	/*
c6295cdf TH	71	* A SCSI Command is assigned a nonzero serial_number before passed
	72	* to the driver's queue command function. The serial_number is
	73	* cleared when scsi_done is entered indicating that the command
12a44162 MW	74	* has been completed. It is a bug for LLDDs to use this number
	75	* for purposes other than printk (and even that is only useful
	76	* for debugging).
1da177e4 LT	77	*/
1da177e4 LT	78	unsigned long serial_number;
12a44162	79
b21a4138 JB	80	/*
	81	* This is set to jiffies as it was when the command was first
	82	* allocated. It is used to time how long the command has
	83	* been outstanding
	84	*/
	85	unsigned long jiffies_at_alloc;
1da177e4 LT	86
	87	int retries;
	88	int allowed;
1da177e4	89
db007fc5 MP	90	unsigned char prot_op;
db007fc5 MP	91	unsigned char prot_type;
c611529e	92	unsigned char prot_flags;
db007fc5	93
db4742dd	94	unsigned short cmd_len;
1da177e4	95	enum dma_data_direction sc_data_direction;
1da177e4 LT	96
1da177e4 LT	97	/* These elements define the operation we are about to perform */
64a87b24	98	unsigned char *cmnd;
1da177e4	99
1da177e4 LT	100
1da177e4 LT	101	/* These elements define the operation we ultimately want to perform */
30b0c37b	102	struct scsi_data_buffer sdb;
7027ad72 MP	103	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	104
1da177e4 LT	105	unsigned underflow; /* Return error if less than
1da177e4 LT	106	this amount is transferred */
1da177e4 LT	107
	108	unsigned transfersize; /* How much we are guaranteed to
	109	transfer with each SCSI transfer
	110	(ie, between disconnect /
	111	reconnects. Probably == sector
	112	size */
	113
1da177e4 LT	114	struct request request; / The command we are
	115	working on */
	116
	117	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	118	unsigned char *sense_buffer;
c67a848c MW	119	/* obtained by REQUEST SENSE when
	120	* CHECK CONDITION is received on original
	121	* command (auto-sense) */
1da177e4 LT	122
	123	/* Low-level done function - can be used by low-level driver to point
	124	* to completion function. Not used by mid/upper level code. */
	125	void (scsi_done) (struct scsi_cmnd );
	126
	127	/*
	128	* The following fields can be written to by the host specific code.
	129	* Everything else should be left alone.
	130	*/
	131	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	132
	133	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	134	* call scsi_malloc and get some memory
	135	* and hang it here. The host adapter
	136	* is also expected to call scsi_free
	137	* to release this memory. (The memory
	138	* obtained by scsi_malloc is guaranteed
	139	* to be at an address < 16Mb). */
1da177e4 LT	140
1da177e4 LT	141	int result; /* Status code from lower level driver */
125c99bc	142	int flags; /* Command flags */
1da177e4 LT	143
1da177e4 LT	144	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	145	};
1da177e4 LT	146
b54197c4 CH	147	/*
	148	* Return the driver private allocation behind the command.
	149	* Only works if cmd_size is set in the host template.
	150	*/
	151	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	152	{
	153	return cmd + 1;
	154	}
	155
57292b58	156	/* make sure not to use it with passthrough commands */
18a4d0a2 MP	157	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	158	{
329a402c	159	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	160	}
18a4d0a2 MP	161
c53033f6	162	extern struct scsi_cmnd scsi_get_command(struct scsi_device , gfp_t);
1da177e4	163	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	164	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	165
cdb8c2a6 GL	166	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	167	size_t offset, size_t len);
	168	extern void scsi_kunmap_atomic_sg(void *virt);
	169
3c356bde	170	extern int scsi_init_io(struct scsi_cmnd *cmd);
ca18d6f7	171	extern void scsi_initialize_rq(struct request *rq);
b58d9154	172
824d7b57 FT	173	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	174	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	175
30b0c37b BH	176	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	177	{
	178	return cmd->sdb.table.nents;
	179	}
	180
	181	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	182	{
	183	return cmd->sdb.table.sgl;
	184	}
	185
	186	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	187	{
	188	return cmd->sdb.length;
	189	}
824d7b57 FT	190
	191	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	192	{
30b0c37b	193	cmd->sdb.resid = resid;
824d7b57 FT	194	}
	195
	196	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	197	{
30b0c37b	198	return cmd->sdb.resid;
824d7b57 FT	199	}
	200
	201	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	202	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	203
6f9a35e2 BH	204	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	205	{
	206	return blk_bidi_rq(cmd->request) &&
	207	(cmd->request->next_rq->special != NULL);
	208	}
	209
	210	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	211	{
	212	return scsi_bidi_cmnd(cmd) ?
	213	cmd->request->next_rq->special : &cmd->sdb;
	214	}
	215
	216	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	217	{
	218	return &cmd->sdb;
	219	}
	220
9ac16b61 FT	221	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	222	void *buf, int buflen)
	223	{
	224	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	225	buf, buflen);
	226	}
	227
	228	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	229	void *buf, int buflen)
	230	{
	231	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	232	buf, buflen);
	233	}
	234
db007fc5 MP	235	/*
	236	* The operations below are hints that tell the controller driver how
	237	* to handle I/Os with DIF or similar types of protection information.
	238	*/
	239	enum scsi_prot_operations {
	240	/* Normal I/O */
	241	SCSI_PROT_NORMAL = 0,
	242
	243	/* OS-HBA: Protected, HBA-Target: Unprotected */
	244	SCSI_PROT_READ_INSERT,
	245	SCSI_PROT_WRITE_STRIP,
	246
	247	/* OS-HBA: Unprotected, HBA-Target: Protected */
	248	SCSI_PROT_READ_STRIP,
	249	SCSI_PROT_WRITE_INSERT,
	250
	251	/* OS-HBA: Protected, HBA-Target: Protected */
	252	SCSI_PROT_READ_PASS,
	253	SCSI_PROT_WRITE_PASS,
db007fc5 MP	254	};
	255
	256	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	257	{
	258	scmd->prot_op = op;
	259	}
	260
	261	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	262	{
	263	return scmd->prot_op;
	264	}
	265
c611529e MP	266	enum scsi_prot_flags {
	267	SCSI_PROT_TRANSFER_PI = 1 << 0,
	268	SCSI_PROT_GUARD_CHECK = 1 << 1,
	269	SCSI_PROT_REF_CHECK = 1 << 2,
	270	SCSI_PROT_REF_INCREMENT = 1 << 3,
	271	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	272	};
	273
db007fc5 MP	274	/*
	275	* The controller usually does not know anything about the target it
	276	* is communicating with. However, when DIX is enabled the controller
	277	* must be know target type so it can verify the protection
	278	* information passed along with the I/O.
	279	*/
	280	enum scsi_prot_target_type {
	281	SCSI_PROT_DIF_TYPE0 = 0,
	282	SCSI_PROT_DIF_TYPE1,
	283	SCSI_PROT_DIF_TYPE2,
	284	SCSI_PROT_DIF_TYPE3,
	285	};
	286
	287	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	288	{
	289	scmd->prot_type = type;
	290	}
	291
	292	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	293	{
	294	return scmd->prot_type;
	295	}
	296
	297	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	298	{
83096ebf	299	return blk_rq_pos(scmd->request);
db007fc5 MP	300	}
db007fc5 MP	301
c611529e MP	302	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	303	{
	304	return scmd->device->sector_size;
	305	}
	306
	307	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	308	{
	309	return blk_rq_pos(scmd->request) >>
	310	(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
	311	}
	312
7027ad72 MP	313	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	314	{
	315	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	316	}
	317
	318	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	319	{
	320	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	321	}
	322
	323	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	324	{
	325	return cmd->prot_sdb;
	326	}
	327
	328	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	329	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	330
f290f197 JB	331	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	332	{
3384db9e	333	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	334	}
	335
	336	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	337	{
3384db9e	338	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	339	}
	340
	341	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	342	{
3384db9e	343	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	344	}
f290f197 JB	345
8846bab1 SG	346	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	347	{
5616b0a4	348	unsigned int xfer_len = scsi_out(scmd)->length;
c611529e	349	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	350
c611529e MP	351	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	352	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	353
c611529e	354	return xfer_len;
8846bab1 SG	355	}
8846bab1 SG	356
1da177e4	357	#endif /* _SCSI_SCSI_CMND_H */