[mirror_ubuntu-bionic-kernel.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_ZONE_WRITE_LOCK	(1 << 2)
#define SCMD_INITIALIZED	(1 << 3)
/* 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 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
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)
70e42fd0	61	#define SCMD_ZONE_WRITE_LOCK (1 << 2)
64104f70 BVA	62	#define SCMD_INITIALIZED (1 << 3)
	63	/* flags preserved across unprep / reprep */
	64	#define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA \| SCMD_INITIALIZED)
125c99bc	65
1da177e4	66	struct scsi_cmnd {
82ed4db4	67	struct scsi_request req;
1da177e4	68	struct scsi_device *device;
1da177e4	69	struct list_head list; /* scsi_cmnd participates in queue lists */
1da177e4	70	struct list_head eh_entry; /* entry for the host eh_cmd_q */
e494f6a7	71	struct delayed_work abort_work;
dbe55f8b BVA	72
	73	struct rcu_head rcu;
	74
1da177e4	75	int eh_eflags; /* Used by error handlr */
1da177e4 LT	76
1da177e4 LT	77	/*
c6295cdf TH	78	* A SCSI Command is assigned a nonzero serial_number before passed
	79	* to the driver's queue command function. The serial_number is
	80	* cleared when scsi_done is entered indicating that the command
12a44162 MW	81	* has been completed. It is a bug for LLDDs to use this number
	82	* for purposes other than printk (and even that is only useful
	83	* for debugging).
1da177e4 LT	84	*/
1da177e4 LT	85	unsigned long serial_number;
12a44162	86
b21a4138 JB	87	/*
	88	* This is set to jiffies as it was when the command was first
	89	* allocated. It is used to time how long the command has
	90	* been outstanding
	91	*/
	92	unsigned long jiffies_at_alloc;
1da177e4 LT	93
	94	int retries;
	95	int allowed;
1da177e4	96
db007fc5 MP	97	unsigned char prot_op;
db007fc5 MP	98	unsigned char prot_type;
c611529e	99	unsigned char prot_flags;
db007fc5	100
db4742dd	101	unsigned short cmd_len;
1da177e4	102	enum dma_data_direction sc_data_direction;
1da177e4 LT	103
1da177e4 LT	104	/* These elements define the operation we are about to perform */
64a87b24	105	unsigned char *cmnd;
1da177e4	106
1da177e4 LT	107
1da177e4 LT	108	/* These elements define the operation we ultimately want to perform */
30b0c37b	109	struct scsi_data_buffer sdb;
7027ad72 MP	110	struct scsi_data_buffer *prot_sdb;
7027ad72 MP	111
1da177e4 LT	112	unsigned underflow; /* Return error if less than
1da177e4 LT	113	this amount is transferred */
1da177e4 LT	114
	115	unsigned transfersize; /* How much we are guaranteed to
	116	transfer with each SCSI transfer
	117	(ie, between disconnect /
	118	reconnects. Probably == sector
	119	size */
	120
1da177e4 LT	121	struct request request; / The command we are
	122	working on */
	123
	124	#define SCSI_SENSE_BUFFERSIZE 96
de25deb1	125	unsigned char *sense_buffer;
c67a848c MW	126	/* obtained by REQUEST SENSE when
	127	* CHECK CONDITION is received on original
	128	* command (auto-sense) */
1da177e4 LT	129
	130	/* Low-level done function - can be used by low-level driver to point
	131	* to completion function. Not used by mid/upper level code. */
	132	void (scsi_done) (struct scsi_cmnd );
	133
	134	/*
	135	* The following fields can be written to by the host specific code.
	136	* Everything else should be left alone.
	137	*/
	138	struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
	139
	140	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	141	* call scsi_malloc and get some memory
	142	* and hang it here. The host adapter
	143	* is also expected to call scsi_free
	144	* to release this memory. (The memory
	145	* obtained by scsi_malloc is guaranteed
	146	* to be at an address < 16Mb). */
1da177e4 LT	147
1da177e4 LT	148	int result; /* Status code from lower level driver */
125c99bc	149	int flags; /* Command flags */
1da177e4 LT	150
1da177e4 LT	151	unsigned char tag; /* SCSI-II queued command tag */
1da177e4 LT	152	};
1da177e4 LT	153
b54197c4 CH	154	/*
	155	* Return the driver private allocation behind the command.
	156	* Only works if cmd_size is set in the host template.
	157	*/
	158	static inline void scsi_cmd_priv(struct scsi_cmnd cmd)
	159	{
	160	return cmd + 1;
	161	}
	162
57292b58	163	/* make sure not to use it with passthrough commands */
18a4d0a2 MP	164	static inline struct scsi_driver scsi_cmd_to_driver(struct scsi_cmnd cmd)
18a4d0a2 MP	165	{
329a402c	166	return (struct scsi_driver *)cmd->request->rq_disk->private_data;
18a4d0a2 MP	167	}
18a4d0a2 MP	168
1da177e4	169	extern void scsi_put_command(struct scsi_cmnd *);
1da177e4 LT	170	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	171
cdb8c2a6 GL	172	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	173	size_t offset, size_t len);
	174	extern void scsi_kunmap_atomic_sg(void *virt);
	175
3c356bde	176	extern int scsi_init_io(struct scsi_cmnd *cmd);
ca18d6f7	177	extern void scsi_initialize_rq(struct request *rq);
b58d9154	178
824d7b57 FT	179	extern int scsi_dma_map(struct scsi_cmnd *cmd);
	180	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
	181
30b0c37b BH	182	static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
	183	{
	184	return cmd->sdb.table.nents;
	185	}
	186
	187	static inline struct scatterlist scsi_sglist(struct scsi_cmnd cmd)
	188	{
	189	return cmd->sdb.table.sgl;
	190	}
	191
	192	static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
	193	{
	194	return cmd->sdb.length;
	195	}
824d7b57 FT	196
	197	static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
	198	{
30b0c37b	199	cmd->sdb.resid = resid;
824d7b57 FT	200	}
	201
	202	static inline int scsi_get_resid(struct scsi_cmnd *cmd)
	203	{
30b0c37b	204	return cmd->sdb.resid;
824d7b57 FT	205	}
	206
	207	#define scsi_for_each_sg(cmd, sg, nseg, __i) \
c6132da1	208	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
824d7b57	209
6f9a35e2 BH	210	static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
	211	{
	212	return blk_bidi_rq(cmd->request) &&
	213	(cmd->request->next_rq->special != NULL);
	214	}
	215
	216	static inline struct scsi_data_buffer scsi_in(struct scsi_cmnd cmd)
	217	{
	218	return scsi_bidi_cmnd(cmd) ?
	219	cmd->request->next_rq->special : &cmd->sdb;
	220	}
	221
	222	static inline struct scsi_data_buffer scsi_out(struct scsi_cmnd cmd)
	223	{
	224	return &cmd->sdb;
	225	}
	226
9ac16b61 FT	227	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
	228	void *buf, int buflen)
	229	{
	230	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	231	buf, buflen);
	232	}
	233
	234	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	235	void *buf, int buflen)
	236	{
	237	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	238	buf, buflen);
	239	}
	240
db007fc5 MP	241	/*
	242	* The operations below are hints that tell the controller driver how
	243	* to handle I/Os with DIF or similar types of protection information.
	244	*/
	245	enum scsi_prot_operations {
	246	/* Normal I/O */
	247	SCSI_PROT_NORMAL = 0,
	248
	249	/* OS-HBA: Protected, HBA-Target: Unprotected */
	250	SCSI_PROT_READ_INSERT,
	251	SCSI_PROT_WRITE_STRIP,
	252
	253	/* OS-HBA: Unprotected, HBA-Target: Protected */
	254	SCSI_PROT_READ_STRIP,
	255	SCSI_PROT_WRITE_INSERT,
	256
	257	/* OS-HBA: Protected, HBA-Target: Protected */
	258	SCSI_PROT_READ_PASS,
	259	SCSI_PROT_WRITE_PASS,
db007fc5 MP	260	};
	261
	262	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	263	{
	264	scmd->prot_op = op;
	265	}
	266
	267	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	268	{
	269	return scmd->prot_op;
	270	}
	271
c611529e MP	272	enum scsi_prot_flags {
	273	SCSI_PROT_TRANSFER_PI = 1 << 0,
	274	SCSI_PROT_GUARD_CHECK = 1 << 1,
	275	SCSI_PROT_REF_CHECK = 1 << 2,
	276	SCSI_PROT_REF_INCREMENT = 1 << 3,
	277	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	278	};
	279
db007fc5 MP	280	/*
	281	* The controller usually does not know anything about the target it
	282	* is communicating with. However, when DIX is enabled the controller
	283	* must be know target type so it can verify the protection
	284	* information passed along with the I/O.
	285	*/
	286	enum scsi_prot_target_type {
	287	SCSI_PROT_DIF_TYPE0 = 0,
	288	SCSI_PROT_DIF_TYPE1,
	289	SCSI_PROT_DIF_TYPE2,
	290	SCSI_PROT_DIF_TYPE3,
	291	};
	292
	293	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	294	{
	295	scmd->prot_type = type;
	296	}
	297
	298	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	299	{
	300	return scmd->prot_type;
	301	}
	302
	303	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	304	{
83096ebf	305	return blk_rq_pos(scmd->request);
db007fc5 MP	306	}
db007fc5 MP	307
c611529e MP	308	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	309	{
	310	return scmd->device->sector_size;
	311	}
	312
	313	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	314	{
	315	return blk_rq_pos(scmd->request) >>
	316	(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
	317	}
	318
7027ad72 MP	319	static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
	320	{
	321	return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
	322	}
	323
	324	static inline struct scatterlist scsi_prot_sglist(struct scsi_cmnd cmd)
	325	{
	326	return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
	327	}
	328
	329	static inline struct scsi_data_buffer scsi_prot(struct scsi_cmnd cmd)
	330	{
	331	return cmd->prot_sdb;
	332	}
	333
	334	#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
	335	for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
	336
f290f197 JB	337	static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	338	{
3384db9e	339	cmd->result = (cmd->result & 0xffff00ff) \| (status << 8);
f290f197 JB	340	}
	341
	342	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
	343	{
3384db9e	344	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	345	}
	346
	347	static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
	348	{
3384db9e	349	cmd->result = (cmd->result & 0x00ffffff) \| (status << 24);
f290f197 JB	350	}
f290f197 JB	351
8846bab1 SG	352	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	353	{
5616b0a4	354	unsigned int xfer_len = scsi_out(scmd)->length;
c611529e	355	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	356
c611529e MP	357	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	358	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	359
c611529e	360	return xfer_len;
8846bab1 SG	361	}
8846bab1 SG	362
1da177e4	363	#endif /* _SCSI_SCSI_CMND_H */