[linux-2.6-block.git] / include / scsi / scsi_cmnd.h

/* SPDX-License-Identifier: GPL-2.0 */
#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_INITIALIZED	(1 << 2)
/* flags preserved across unprep / reprep */
#define SCMD_PRESERVED_FLAGS	(SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED)

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;

	struct rcu_head rcu;

	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 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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _SCSI_SCSI_CMND_H
	3	#define _SCSI_SCSI_CMND_H
	4
	5	#include <linux/dma-mapping.h>
6f9a35e2	6	#include <linux/blkdev.h>
1da177e4 LT	7	#include <linux/list.h>
1da177e4 LT	8	#include <linux/types.h>
4e57b681	9	#include <linux/timer.h>
c6132da1	10	#include <linux/scatterlist.h>
8846bab1	11	#include <scsi/scsi_device.h>
82ed4db4	12	#include <scsi/scsi_request.h>
1da177e4	13
b58d9154	14	struct Scsi_Host;
18a4d0a2	15	struct scsi_driver;
1da177e4	16
c611529e MP	17	#include <scsi/scsi_device.h>
c611529e MP	18
64a87b24 BH	19	/*
	20	* MAX_COMMAND_SIZE is:
	21	* The longest fixed-length SCSI CDB as per the SCSI standard.
	22	* fixed-length means: commands that their size can be determined
	23	* by their opcode and the CDB does not carry a length specifier, (unlike
	24	* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
	25	* true and the SCSI standard also defines extended commands and
	26	* vendor specific commands that can be bigger than 16 bytes. The kernel
	27	* will support these using the same infrastructure used for VARLEN CDB's.
	28	* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
	29	* supports without specifying a cmd_len by ULD's
	30	*/
	31	#define MAX_COMMAND_SIZE 16
	32	#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
	33	# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
	34	#endif
	35
30b0c37b BH	36	struct scsi_data_buffer {
	37	struct sg_table table;
	38	unsigned length;
	39	int resid;
	40	};
1da177e4 LT	41
	42	/* embedded in scsi_cmnd */
	43	struct scsi_pointer {
	44	char ptr; / data pointer */
	45	int this_residual; /* left in this buffer */
	46	struct scatterlist buffer; / which buffer */
	47	int buffers_residual; /* how many buffers left */
	48
	49	dma_addr_t dma_handle;
	50
	51	volatile int Status;
	52	volatile int Message;
	53	volatile int have_data_in;
	54	volatile int sent_command;
	55	volatile int phase;
	56	};
	57
125c99bc CH	58	/* for scmd->flags */
125c99bc CH	59	#define SCMD_TAGGED (1 << 0)
8e688254	60	#define SCMD_UNCHECKED_ISA_DMA (1 << 1)
39051dd8	61	#define SCMD_INITIALIZED (1 << 2)
64104f70 BVA	62	/* flags preserved across unprep / reprep */
64104f70 BVA	63	#define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA \| SCMD_INITIALIZED)
125c99bc	64
1da177e4	65	struct scsi_cmnd {
82ed4db4	66	struct scsi_request req;
1da177e4	67	struct scsi_device *device;
1da177e4	68	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	69	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	70	struct delayed_work abort_work;
3be8828f BVA	71
	72	struct rcu_head rcu;
	73
1da177e4	74	int eh_eflags; /* Used by error handlr */
1da177e4 LT	75
1da177e4 LT	76	/*
c6295cdf	77	* A SCSI Command is assigned a nonzero serial_number before passed
	78	* to the driver's queue command function. The serial_number is
	79	* cleared when scsi_done is entered indicating that the command
12a44162 MW	80	* has been completed. It is a bug for LLDDs to use this number
	81	* for purposes other than printk (and even that is only useful
	82	* for debugging).
1da177e4 LT	83	*/
1da177e4 LT	84	unsigned long serial_number;
12a44162	85
b21a4138 JB	86	/*
	87	* This is set to jiffies as it was when the command was first
	88	* allocated. It is used to time how long the command has
	89	* been outstanding
	90	*/
	91	unsigned long jiffies_at_alloc;
1da177e4 LT	92
	93	int retries;
	94	int allowed;
1da177e4	95
db007fc5 MP	96	unsigned char prot_op;
db007fc5 MP	97	unsigned char prot_type;
c611529e	98	unsigned char prot_flags;
db007fc5	99
db4742dd	100	unsigned short cmd_len;
1da177e4	101	enum dma_data_direction sc_data_direction;
1da177e4 LT	102
1da177e4 LT	103	/* These elements define the operation we are about to perform */
64a87b24	104	unsigned char *cmnd;
1da177e4	105
1da177e4 LT	106
1da177e4 LT	107	/* These elements define the operation we ultimately want to perform */
30b0c37b	108	struct scsi_data_buffer sdb;
7027ad72 MP	109	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	110
1da177e4 LT	111	unsigned underflow; /* Return error if less than
1da177e4 LT	112	this amount is transferred */
1da177e4 LT	113
	114	unsigned transfersize; /* How much we are guaranteed to
	115	transfer with each SCSI transfer
	116	(ie, between disconnect /
	117	reconnects. Probably == sector
	118	size */
	119
1da177e4 LT	120	struct request request; / The command we are
	121	working on */
	122
	123	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	124	unsigned char *sense_buffer;
c67a848c MW	125	/* obtained by REQUEST SENSE when
	126	* CHECK CONDITION is received on original
	127	* command (auto-sense) */
1da177e4 LT	128
	129	/* Low-level done function - can be used by low-level driver to point
	130	* to completion function. Not used by mid/upper level code. */
	131	void (scsi_done) (struct scsi_cmnd );
	132
	133	/*
	134	* The following fields can be written to by the host specific code.
	135	* Everything else should be left alone.
	136	*/
	137	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	138
	139	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	140	* call scsi_malloc and get some memory
	141	* and hang it here. The host adapter
	142	* is also expected to call scsi_free
	143	* to release this memory. (The memory
	144	* obtained by scsi_malloc is guaranteed
	145	* to be at an address < 16Mb). */
1da177e4 LT	146
1da177e4 LT	147	int result; /* Status code from lower level driver */
125c99bc	148	int flags; /* Command flags */
1da177e4 LT	149
1da177e4 LT	150	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	151	};
1da177e4 LT	152
b54197c4 CH	153	/*
	154	* Return the driver private allocation behind the command.
	155	* Only works if cmd_size is set in the host template.
	156	*/
	157	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	158	{
	159	return cmd + 1;
	160	}
	161
57292b58	162	/* make sure not to use it with passthrough commands */
18a4d0a2 MP	163	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	164	{
329a402c	165	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	166	}
18a4d0a2 MP	167
1da177e4	168	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	169	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	170
cdb8c2a6 GL	171	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	172	size_t offset, size_t len);
	173	extern void scsi_kunmap_atomic_sg(void *virt);
	174
3c356bde	175	extern int scsi_init_io(struct scsi_cmnd *cmd);
b58d9154	176
824d7b57 FT	177	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	178	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	179
30b0c37b BH	180	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	181	{
	182	return cmd->sdb.table.nents;
	183	}
	184
	185	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	186	{
	187	return cmd->sdb.table.sgl;
	188	}
	189
	190	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	191	{
	192	return cmd->sdb.length;
	193	}
824d7b57 FT	194
	195	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	196	{
30b0c37b	197	cmd->sdb.resid = resid;
824d7b57 FT	198	}
	199
	200	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	201	{
30b0c37b	202	return cmd->sdb.resid;
824d7b57 FT	203	}
	204
	205	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	206	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	207
6f9a35e2 BH	208	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	209	{
	210	return blk_bidi_rq(cmd->request) &&
	211	(cmd->request->next_rq->special != NULL);
	212	}
	213
	214	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	215	{
	216	return scsi_bidi_cmnd(cmd) ?
	217	cmd->request->next_rq->special : &cmd->sdb;
	218	}
	219
	220	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	221	{
	222	return &cmd->sdb;
	223	}
	224
9ac16b61 FT	225	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	226	void *buf, int buflen)
	227	{
	228	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	229	buf, buflen);
	230	}
	231
	232	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	233	void *buf, int buflen)
	234	{
	235	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	236	buf, buflen);
	237	}
	238
db007fc5 MP	239	/*
	240	* The operations below are hints that tell the controller driver how
	241	* to handle I/Os with DIF or similar types of protection information.
	242	*/
	243	enum scsi_prot_operations {
	244	/* Normal I/O */
	245	SCSI_PROT_NORMAL = 0,
	246
	247	/* OS-HBA: Protected, HBA-Target: Unprotected */
	248	SCSI_PROT_READ_INSERT,
	249	SCSI_PROT_WRITE_STRIP,
	250
	251	/* OS-HBA: Unprotected, HBA-Target: Protected */
	252	SCSI_PROT_READ_STRIP,
	253	SCSI_PROT_WRITE_INSERT,
	254
	255	/* OS-HBA: Protected, HBA-Target: Protected */
	256	SCSI_PROT_READ_PASS,
	257	SCSI_PROT_WRITE_PASS,
db007fc5 MP	258	};
	259
	260	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	261	{
	262	scmd->prot_op = op;
	263	}
	264
	265	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	266	{
	267	return scmd->prot_op;
	268	}
	269
c611529e MP	270	enum scsi_prot_flags {
	271	SCSI_PROT_TRANSFER_PI = 1 << 0,
	272	SCSI_PROT_GUARD_CHECK = 1 << 1,
	273	SCSI_PROT_REF_CHECK = 1 << 2,
	274	SCSI_PROT_REF_INCREMENT = 1 << 3,
	275	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	276	};
	277
db007fc5 MP	278	/*
	279	* The controller usually does not know anything about the target it
	280	* is communicating with. However, when DIX is enabled the controller
	281	* must be know target type so it can verify the protection
	282	* information passed along with the I/O.
	283	*/
	284	enum scsi_prot_target_type {
	285	SCSI_PROT_DIF_TYPE0 = 0,
	286	SCSI_PROT_DIF_TYPE1,
	287	SCSI_PROT_DIF_TYPE2,
	288	SCSI_PROT_DIF_TYPE3,
	289	};
	290
	291	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	292	{
	293	scmd->prot_type = type;
	294	}
	295
	296	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	297	{
	298	return scmd->prot_type;
	299	}
	300
	301	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	302	{
83096ebf	303	return blk_rq_pos(scmd->request);
db007fc5 MP	304	}
db007fc5 MP	305
c611529e MP	306	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	307	{
	308	return scmd->device->sector_size;
	309	}
	310
	311	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	312	{
	313	return blk_rq_pos(scmd->request) >>
	314	(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
	315	}
	316
7027ad72 MP	317	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	318	{
	319	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	320	}
	321
	322	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	323	{
	324	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	325	}
	326
	327	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	328	{
	329	return cmd->prot_sdb;
	330	}
	331
	332	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	333	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	334
f290f197 JB	335	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	336	{
3384db9e	337	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	338	}
	339
	340	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	341	{
3384db9e	342	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	343	}
	344
	345	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	346	{
3384db9e	347	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	348	}
f290f197 JB	349
8846bab1 SG	350	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	351	{
5616b0a4	352	unsigned int xfer_len = scsi_out(scmd)->length;
c611529e	353	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	354
c611529e MP	355	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	356	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	357
c611529e	358	return xfer_len;
8846bab1 SG	359	}
8846bab1 SG	360
1da177e4	361	#endif /* _SCSI_SCSI_CMND_H */