[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/t10-pi.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_device.h>

struct Scsi_Host;

/*
 * 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

struct scsi_data_buffer {
	struct sg_table table;
	unsigned length;
};

/* 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_INITIALIZED	(1 << 1)
#define SCMD_LAST		(1 << 2)
/* flags preserved across unprep / reprep */
#define SCMD_PRESERVED_FLAGS	(SCMD_INITIALIZED)

/* for scmd->state */
#define SCMD_STATE_COMPLETE	0
#define SCMD_STATE_INFLIGHT	1

enum scsi_cmnd_submitter {
	SUBMITTED_BY_BLOCK_LAYER = 0,
	SUBMITTED_BY_SCSI_ERROR_HANDLER = 1,
	SUBMITTED_BY_SCSI_RESET_IOCTL = 2,
} __packed;

struct scsi_cmnd {
	struct scsi_device *device;
	struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */
	struct delayed_work abort_work;

	struct rcu_head rcu;

	int eh_eflags;		/* Used by error handlr */

	int budget_token;

	/*
	 * 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;
	enum scsi_cmnd_submitter submitter;

	unsigned short cmd_len;
	enum dma_data_direction sc_data_direction;

	unsigned char cmnd[32]; /* SCSI CDB */

	/* 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 */
	unsigned resid_len;	/* residual count */
	unsigned sense_len;
	unsigned char *sense_buffer;
				/* obtained by REQUEST SENSE when
				 * CHECK CONDITION is received on original
				 * command (auto-sense). Length must be
				 * SCSI_SENSE_BUFFERSIZE bytes. */

	int flags;		/* Command flags */
	unsigned long state;	/* Command completion state */

	unsigned int extra_len;	/* length of alignment and padding */

	/*
	 * The fields below can be modified by the LLD but the fields above
	 * must not be modified.
	 */

	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 */
};

/* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
{
	return blk_mq_rq_from_pdu(scmd);
}

/*
 * 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;
}

void scsi_done(struct scsi_cmnd *cmd);
void scsi_done_direct(struct scsi_cmnd *cmd);

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);

blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
void scsi_free_sgtables(struct scsi_cmnd *cmd);

#ifdef CONFIG_SCSI_DMA
extern int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
#else /* !CONFIG_SCSI_DMA */
static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
#endif /* !CONFIG_SCSI_DMA */

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, unsigned int resid)
{
	cmd->resid_len = resid;
}

static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
{
	return cmd->resid_len;
}

#define scsi_for_each_sg(cmd, sg, nseg, __i)			\
	for_each_sg(scsi_sglist(cmd), sg, nseg, __i)

static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
					   const 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);
}

static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
{
	return blk_rq_pos(scsi_cmd_to_rq(scmd));
}

static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
{
	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;

	return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
}

static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
{
	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;

	return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
}

/*
 * 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 u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
{
	struct request *rq = blk_mq_rq_from_pdu(scmd);

	return t10_pi_ref_tag(rq);
}

static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
{
	return scmd->device->sector_size;
}

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_status_byte(struct scsi_cmnd *cmd, char status)
{
	cmd->result = (cmd->result & 0xffffff00) | status;
}

static inline u8 get_status_byte(struct scsi_cmnd *cmd)
{
	return cmd->result & 0xff;
}

static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
{
	cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
}

static inline u8 get_host_byte(struct scsi_cmnd *cmd)
{
	return (cmd->result >> 16) & 0xff;
}

/**
 * scsi_msg_to_host_byte() - translate message byte
 *
 * Translate the SCSI parallel message byte to a matching
 * host byte setting. A message of COMMAND_COMPLETE indicates
 * a successful command execution, any other message indicate
 * an error. As the messages themselves only have a meaning
 * for the SCSI parallel protocol this function translates
 * them into a matching host byte value for SCSI EH.
 */
static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
{
	switch (msg) {
	case COMMAND_COMPLETE:
		break;
	case ABORT_TASK_SET:
		set_host_byte(cmd, DID_ABORT);
		break;
	case TARGET_RESET:
		set_host_byte(cmd, DID_RESET);
		break;
	default:
		set_host_byte(cmd, DID_ERROR);
		break;
	}
}

static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
{
	unsigned int xfer_len = scmd->sdb.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;
}

extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
			     u8 key, u8 asc, u8 ascq);

struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
				   blk_mq_req_flags_t flags);

#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>
ddd0bc75	7	#include <linux/t10-pi.h>
1da177e4 LT	8	#include <linux/list.h>
1da177e4 LT	9	#include <linux/types.h>
4e57b681	10	#include <linux/timer.h>
c6132da1	11	#include <linux/scatterlist.h>
8846bab1	12	#include <scsi/scsi_device.h>
1da177e4	13
b58d9154	14	struct Scsi_Host;
1da177e4	15
64a87b24 BH	16	/*
	17	* MAX_COMMAND_SIZE is:
	18	* The longest fixed-length SCSI CDB as per the SCSI standard.
	19	* fixed-length means: commands that their size can be determined
	20	* by their opcode and the CDB does not carry a length specifier, (unlike
	21	* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
	22	* true and the SCSI standard also defines extended commands and
	23	* vendor specific commands that can be bigger than 16 bytes. The kernel
	24	* will support these using the same infrastructure used for VARLEN CDB's.
	25	* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
	26	* supports without specifying a cmd_len by ULD's
	27	*/
	28	#define MAX_COMMAND_SIZE 16
64a87b24	29
30b0c37b BH	30	struct scsi_data_buffer {
	31	struct sg_table table;
	32	unsigned length;
30b0c37b	33	};
1da177e4 LT	34
	35	/* embedded in scsi_cmnd */
	36	struct scsi_pointer {
	37	char ptr; / data pointer */
	38	int this_residual; /* left in this buffer */
	39	struct scatterlist buffer; / which buffer */
	40	int buffers_residual; /* how many buffers left */
	41
	42	dma_addr_t dma_handle;
	43
	44	volatile int Status;
	45	volatile int Message;
	46	volatile int have_data_in;
	47	volatile int sent_command;
	48	volatile int phase;
	49	};
	50
125c99bc CH	51	/* for scmd->flags */
125c99bc CH	52	#define SCMD_TAGGED (1 << 0)
aaff5eba CH	53	#define SCMD_INITIALIZED (1 << 1)
aaff5eba CH	54	#define SCMD_LAST (1 << 2)
64104f70	55	/* flags preserved across unprep / reprep */
aaff5eba	56	#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED)
125c99bc	57
f1342709	58	/* for scmd->state */
29cadd2b	59	#define SCMD_STATE_COMPLETE 0
6eb045e0	60	#define SCMD_STATE_INFLIGHT 1
f1342709	61
bf23e619 BVA	62	enum scsi_cmnd_submitter {
	63	SUBMITTED_BY_BLOCK_LAYER = 0,
	64	SUBMITTED_BY_SCSI_ERROR_HANDLER = 1,
	65	SUBMITTED_BY_SCSI_RESET_IOCTL = 2,
	66	} __packed;
	67
1da177e4	68	struct scsi_cmnd {
1da177e4	69	struct scsi_device *device;
5ae17501	70	struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */
e494f6a7	71	struct delayed_work abort_work;
3be8828f BVA	72
	73	struct rcu_head rcu;
	74
1da177e4	75	int eh_eflags; /* Used by error handlr */
1da177e4	76
d022d18c ML	77	int budget_token;
d022d18c ML	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;
bf23e619	92	enum scsi_cmnd_submitter submitter;
db007fc5	93
db4742dd	94	unsigned short cmd_len;
1da177e4	95	enum dma_data_direction sc_data_direction;
1da177e4	96
ce70fd9a	97	unsigned char cmnd[32]; /* SCSI CDB */
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 */
a9a4ea11	111	unsigned resid_len; /* residual count */
5b794f98	112	unsigned sense_len;
de25deb1	113	unsigned char *sense_buffer;
c67a848c MW	114	/* obtained by REQUEST SENSE when
c67a848c MW	115	* CHECK CONDITION is received on original
704f8392 KC	116	* command (auto-sense). Length must be
704f8392 KC	117	* SCSI_SENSE_BUFFERSIZE bytes. */
1da177e4	118
8264aee8 BVA	119	int flags; /* Command flags */
	120	unsigned long state; /* Command completion state */
	121
	122	unsigned int extra_len; /* length of alignment and padding */
	123
1da177e4	124	/*
8264aee8 BVA	125	* The fields below can be modified by the LLD but the fields above
8264aee8 BVA	126	* must not be modified.
1da177e4	127	*/
1da177e4 LT	128
1da177e4 LT	129	unsigned char host_scribble; / The host adapter is allowed to
c67a848c MW	130	* call scsi_malloc and get some memory
	131	* and hang it here. The host adapter
	132	* is also expected to call scsi_free
	133	* to release this memory. (The memory
	134	* obtained by scsi_malloc is guaranteed
	135	* to be at an address < 16Mb). */
1da177e4 LT	136
1da177e4 LT	137	int result; /* Status code from lower level driver */
1da177e4 LT	138	};
1da177e4 LT	139
51f3a478 BVA	140	/* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
	141	static inline struct request scsi_cmd_to_rq(struct scsi_cmnd scmd)
	142	{
	143	return blk_mq_rq_from_pdu(scmd);
	144	}
	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
a710eacb	155	void scsi_done(struct scsi_cmnd *cmd);
b84b6ec0	156	void scsi_done_direct(struct scsi_cmnd *cmd);
a710eacb	157
1da177e4 LT	158	extern void scsi_finish_command(struct scsi_cmnd *cmd);
1da177e4 LT	159
cdb8c2a6 GL	160	extern void scsi_kmap_atomic_sg(struct scatterlist sg, int sg_count,
	161	size_t offset, size_t len);
	162	extern void scsi_kunmap_atomic_sg(void *virt);
	163
7007e9dd CH	164	blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
7007e9dd CH	165	void scsi_free_sgtables(struct scsi_cmnd *cmd);
b58d9154	166
bff739b6	167	#ifdef CONFIG_SCSI_DMA
824d7b57 FT	168	extern int scsi_dma_map(struct scsi_cmnd *cmd);
824d7b57 FT	169	extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
bff739b6 GU	170	#else /* !CONFIG_SCSI_DMA */
	171	static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
	172	static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
	173	#endif /* !CONFIG_SCSI_DMA */
824d7b57	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	189
9237f04e	190	static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid)
824d7b57	191	{
a9a4ea11	192	cmd->resid_len = resid;
824d7b57 FT	193	}
824d7b57 FT	194
9237f04e	195	static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
824d7b57	196	{
a9a4ea11	197	return cmd->resid_len;
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
9ac16b61	203	static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
6022f210	204	const void *buf, int buflen)
9ac16b61 FT	205	{
	206	return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	207	buf, buflen);
	208	}
	209
	210	static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
	211	void *buf, int buflen)
	212	{
	213	return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
	214	buf, buflen);
	215	}
	216
f0f214fe BVA	217	static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
f0f214fe BVA	218	{
aa8e25e5	219	return blk_rq_pos(scsi_cmd_to_rq(scmd));
f0f214fe BVA	220	}
f0f214fe BVA	221
d2c945f0 MP	222	static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
	223	{
	224	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
	225
aa8e25e5	226	return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
d2c945f0 MP	227	}
d2c945f0 MP	228
6a20e21a MP	229	static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
	230	{
	231	unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
	232
	233	return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
	234	}
	235
db007fc5 MP	236	/*
	237	* The operations below are hints that tell the controller driver how
	238	* to handle I/Os with DIF or similar types of protection information.
	239	*/
	240	enum scsi_prot_operations {
	241	/* Normal I/O */
	242	SCSI_PROT_NORMAL = 0,
	243
	244	/* OS-HBA: Protected, HBA-Target: Unprotected */
	245	SCSI_PROT_READ_INSERT,
	246	SCSI_PROT_WRITE_STRIP,
	247
	248	/* OS-HBA: Unprotected, HBA-Target: Protected */
	249	SCSI_PROT_READ_STRIP,
	250	SCSI_PROT_WRITE_INSERT,
	251
	252	/* OS-HBA: Protected, HBA-Target: Protected */
	253	SCSI_PROT_READ_PASS,
	254	SCSI_PROT_WRITE_PASS,
db007fc5 MP	255	};
	256
	257	static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
	258	{
	259	scmd->prot_op = op;
	260	}
	261
	262	static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
	263	{
	264	return scmd->prot_op;
	265	}
	266
c611529e MP	267	enum scsi_prot_flags {
	268	SCSI_PROT_TRANSFER_PI = 1 << 0,
	269	SCSI_PROT_GUARD_CHECK = 1 << 1,
	270	SCSI_PROT_REF_CHECK = 1 << 2,
	271	SCSI_PROT_REF_INCREMENT = 1 << 3,
	272	SCSI_PROT_IP_CHECKSUM = 1 << 4,
	273	};
	274
db007fc5 MP	275	/*
	276	* The controller usually does not know anything about the target it
	277	* is communicating with. However, when DIX is enabled the controller
	278	* must be know target type so it can verify the protection
	279	* information passed along with the I/O.
	280	*/
	281	enum scsi_prot_target_type {
	282	SCSI_PROT_DIF_TYPE0 = 0,
	283	SCSI_PROT_DIF_TYPE1,
	284	SCSI_PROT_DIF_TYPE2,
	285	SCSI_PROT_DIF_TYPE3,
	286	};
	287
	288	static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
	289	{
	290	scmd->prot_type = type;
	291	}
	292
	293	static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
	294	{
	295	return scmd->prot_type;
	296	}
	297
7ba46799 MP	298	static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
	299	{
	300	struct request *rq = blk_mq_rq_from_pdu(scmd);
	301
	302	return t10_pi_ref_tag(rq);
	303	}
	304
c611529e MP	305	static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
	306	{
	307	return scmd->device->sector_size;
	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
d37932a9 HR	328	static inline void set_status_byte(struct scsi_cmnd *cmd, char status)
	329	{
	330	cmd->result = (cmd->result & 0xffffff00) \| status;
	331	}
	332
f6b5a697 HR	333	static inline u8 get_status_byte(struct scsi_cmnd *cmd)
	334	{
	335	return cmd->result & 0xff;
	336	}
	337
f290f197 JB	338	static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
f290f197 JB	339	{
3384db9e	340	cmd->result = (cmd->result & 0xff00ffff) \| (status << 16);
f290f197 JB	341	}
f290f197 JB	342
f6b5a697 HR	343	static inline u8 get_host_byte(struct scsi_cmnd *cmd)
	344	{
	345	return (cmd->result >> 16) & 0xff;
	346	}
	347
735b830c HR	348	/**
	349	* scsi_msg_to_host_byte() - translate message byte
	350	*
	351	* Translate the SCSI parallel message byte to a matching
	352	* host byte setting. A message of COMMAND_COMPLETE indicates
	353	* a successful command execution, any other message indicate
	354	* an error. As the messages themselves only have a meaning
	355	* for the SCSI parallel protocol this function translates
	356	* them into a matching host byte value for SCSI EH.
	357	*/
	358	static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
	359	{
	360	switch (msg) {
	361	case COMMAND_COMPLETE:
	362	break;
	363	case ABORT_TASK_SET:
	364	set_host_byte(cmd, DID_ABORT);
	365	break;
	366	case TARGET_RESET:
	367	set_host_byte(cmd, DID_RESET);
	368	break;
	369	default:
	370	set_host_byte(cmd, DID_ERROR);
	371	break;
	372	}
	373	}
f290f197	374
8846bab1 SG	375	static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
8846bab1 SG	376	{
ae3d56d8	377	unsigned int xfer_len = scmd->sdb.length;
c611529e	378	unsigned int prot_interval = scsi_prot_interval(scmd);
8846bab1	379
c611529e MP	380	if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
c611529e MP	381	xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
8846bab1	382
c611529e	383	return xfer_len;
8846bab1 SG	384	}
8846bab1 SG	385
f2b1e9c6 HR	386	extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
	387	u8 key, u8 asc, u8 ascq);
	388
ea957547 BVA	389	struct request scsi_alloc_request(struct request_queue q, blk_opf_t opf,
ea957547 BVA	390	blk_mq_req_flags_t flags);
68ec3b81	391
1da177e4	392	#endif /* _SCSI_SCSI_CMND_H */