[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)

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