Line data Source code
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 18 : if (!sshdr)
33 9 : return 0;
34 :
35 18 : 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 1 : struct scsi_eh_save *ses);
94 1 :
95 : #endif /* _SCSI_SCSI_EH_H */
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