1#ifndef _SCSI_SCSI_EH_H
2#define _SCSI_SCSI_EH_H
3
4#include <linux/scatterlist.h>
5
6#include <scsi/scsi_cmnd.h>
7struct scsi_device;
8struct Scsi_Host;
9
10/*
11 * This is a slightly modified SCSI sense "descriptor" format header.
12 * The addition is to allow the 0x70 and 0x71 response codes. The idea
13 * is to place the salient data from either "fixed" or "descriptor" sense
14 * format into one structure to ease application processing.
15 *
16 * The original sense buffer should be kept around for those cases
17 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
18 */
19struct scsi_sense_hdr {		/* See SPC-3 section 4.5 */
20	u8 response_code;	/* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
21	u8 sense_key;
22	u8 asc;
23	u8 ascq;
24	u8 byte4;
25	u8 byte5;
26	u8 byte6;
27	u8 additional_length;	/* always 0 for fixed sense format */
28};
29
30static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
31{
32	if (!sshdr)
33		return false;
34
35	return (sshdr->response_code & 0x70) == 0x70;
36}
37
38
39extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
40			       struct list_head *done_q);
41extern void scsi_eh_flush_done_q(struct list_head *done_q);
42extern void scsi_report_bus_reset(struct Scsi_Host *, int);
43extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
44extern int scsi_block_when_processing_errors(struct scsi_device *);
45extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
46				 struct scsi_sense_hdr *sshdr);
47extern bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
48					 struct scsi_sense_hdr *sshdr);
49
50static inline bool scsi_sense_is_deferred(const struct scsi_sense_hdr *sshdr)
51{
52	return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
53}
54
55extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
56				       int desc_type);
57
58extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
59				   u64 * info_out);
60
61extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
62
63extern int scsi_ioctl_reset(struct scsi_device *, int __user *);
64
65struct scsi_eh_save {
66	/* saved state */
67	int result;
68	enum dma_data_direction data_direction;
69	unsigned underflow;
70	unsigned char cmd_len;
71	unsigned char prot_op;
72	unsigned char *cmnd;
73	struct scsi_data_buffer sdb;
74	struct request *next_rq;
75	/* new command support */
76	unsigned char eh_cmnd[BLK_MAX_CDB];
77	struct scatterlist sense_sgl;
78};
79
80extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
81		struct scsi_eh_save *ses, unsigned char *cmnd,
82		int cmnd_size, unsigned sense_bytes);
83
84extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
85		struct scsi_eh_save *ses);
86
87#endif /* _SCSI_SCSI_EH_H */
88