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name : 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)
/*
 * libata uses SCSI EH to fetch sense data for successful commands.
 * SCSI EH should not overwrite scmd->result when SCMD_FORCE_EH_SUCCESS is set.
 */
#define SCMD_FORCE_EH_SUCCESS	(1 << 3)
#define SCMD_FAIL_IF_RECOVERING	(1 << 4)
/* flags preserved across unprep / reprep */
#define SCMD_PRESERVED_FLAGS	(SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING)

/* 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);

	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 */
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