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scsi_eh.h
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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 */
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