[linux-block.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)

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