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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/scsi/scsi_eh.h
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#ifndef _SCSI_SCSI_EH_H

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#define _SCSI_SCSI_EH_H

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#include <linux/scatterlist.h>

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#include <scsi/scsi_cmnd.h>

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struct scsi_device;

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struct Scsi_Host;

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/*

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 * This is a slightly modified SCSI sense "descriptor" format header.

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 * The addition is to allow the 0x70 and 0x71 response codes. The idea

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 * is to place the salient data from either "fixed" or "descriptor" sense

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 * format into one structure to ease application processing.

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 *

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 * The original sense buffer should be kept around for those cases

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 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).

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 */

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struct scsi_sense_hdr {		/* See SPC-3 section 4.5 */

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	u8 response_code;	/* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */

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	u8 sense_key;

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	u8 asc;

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	u8 ascq;

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	u8 byte4;

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	u8 byte5;

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	u8 byte6;

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	u8 additional_length;	/* always 0 for fixed sense format */

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};

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static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)

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{

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	if (!sshdr)

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		return 0;

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	return (sshdr->response_code & 0x70) == 0x70;

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}

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extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,

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			       struct list_head *done_q);

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extern void scsi_eh_flush_done_q(struct list_head *done_q);

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extern void scsi_report_bus_reset(struct Scsi_Host *, int);

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extern void scsi_report_device_reset(struct Scsi_Host *, int, int);

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extern int scsi_block_when_processing_errors(struct scsi_device *);

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extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,

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		struct scsi_sense_hdr *sshdr);

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extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,

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		struct scsi_sense_hdr *sshdr);

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static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr)

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{

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	return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));

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}

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extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,

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				       int desc_type);

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extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,

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				   u64 * info_out);

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extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);

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/*

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 * Reset request from external source

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 */

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#define SCSI_TRY_RESET_DEVICE	1

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#define SCSI_TRY_RESET_BUS	2

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#define SCSI_TRY_RESET_HOST	3

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#define SCSI_TRY_RESET_TARGET	4

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extern int scsi_reset_provider(struct scsi_device *, int);

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struct scsi_eh_save {

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	/* saved state */

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	int result;

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	enum dma_data_direction data_direction;

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	unsigned underflow;

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	unsigned char cmd_len;

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	unsigned char prot_op;

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	unsigned char *cmnd;

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	struct scsi_data_buffer sdb;

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	struct request *next_rq;

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	/* new command support */

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	unsigned char eh_cmnd[BLK_MAX_CDB];

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	struct scatterlist sense_sgl;

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};

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extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,

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		struct scsi_eh_save *ses, unsigned char *cmnd,

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		int cmnd_size, unsigned sense_bytes);

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extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,

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		struct scsi_eh_save *ses);

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#endif /* _SCSI_SCSI_EH_H */

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