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>
7 struct scsi_device;
8 struct 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 */
19 struct 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
30 static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
31 {
32 if (!sshdr)
33 return 0;
34
35 return (sshdr->response_code & 0x70) == 0x70;
36 }
37
38
39 extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
40 struct list_head *done_q);
41 extern void scsi_eh_flush_done_q(struct list_head *done_q);
42 extern void scsi_report_bus_reset(struct Scsi_Host *, int);
43 extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
44 extern int scsi_block_when_processing_errors(struct scsi_device *);
45 extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
46 struct scsi_sense_hdr *sshdr);
47 extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
48 struct scsi_sense_hdr *sshdr);
49
50 static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr)
51 {
52 return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
53 }
54
55 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
56 int desc_type);
57
58 extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
59 u64 * info_out);
60
61 extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
62
63 /*
64 * Reset request from external source
65 */
66 #define SCSI_TRY_RESET_DEVICE 1
67 #define SCSI_TRY_RESET_BUS 2
68 #define SCSI_TRY_RESET_HOST 3
69 #define SCSI_TRY_RESET_TARGET 4
70
71 extern int scsi_reset_provider(struct scsi_device *, int);
72
73 struct scsi_eh_save {
74 /* saved state */
75 int result;
76 enum dma_data_direction data_direction;
77 unsigned underflow;
78 unsigned char cmd_len;
79 unsigned char prot_op;
80 unsigned char *cmnd;
81 struct scsi_data_buffer sdb;
82 struct request *next_rq;
83 /* new command support */
84 unsigned char eh_cmnd[BLK_MAX_CDB];
85 struct scatterlist sense_sgl;
86 };
87
88 extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
89 struct scsi_eh_save *ses, unsigned char *cmnd,
90 int cmnd_size, unsigned sense_bytes);
91
92 extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
93 struct scsi_eh_save *ses);
94
95 #endif /* _SCSI_SCSI_EH_H */
96
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