Line data Source code
1 : #ifndef _SCSI_LOGGING_H
2 : #define _SCSI_LOGGING_H
3 :
4 :
5 : /*
6 : * This defines the scsi logging feature. It is a means by which the user
7 : * can select how much information they get about various goings on, and it
8 : * can be really useful for fault tracing. The logging word is divided into
9 : * 8 nibbles, each of which describes a loglevel. The division of things is
10 : * somewhat arbitrary, and the division of the word could be changed if it
11 : * were really needed for any reason. The numbers below are the only place
12 : * where these are specified. For a first go-around, 3 bits is more than
13 : * enough, since this gives 8 levels of logging (really 7, since 0 is always
14 : * off). Cutting to 2 bits might be wise at some point.
15 : */
16 :
17 : #define SCSI_LOG_ERROR_SHIFT 0
18 : #define SCSI_LOG_TIMEOUT_SHIFT 3
19 : #define SCSI_LOG_SCAN_SHIFT 6
20 : #define SCSI_LOG_MLQUEUE_SHIFT 9
21 : #define SCSI_LOG_MLCOMPLETE_SHIFT 12
22 : #define SCSI_LOG_LLQUEUE_SHIFT 15
23 : #define SCSI_LOG_LLCOMPLETE_SHIFT 18
24 : #define SCSI_LOG_HLQUEUE_SHIFT 21
25 : #define SCSI_LOG_HLCOMPLETE_SHIFT 24
26 : #define SCSI_LOG_IOCTL_SHIFT 27
27 :
28 : #define SCSI_LOG_ERROR_BITS 3
29 : #define SCSI_LOG_TIMEOUT_BITS 3
30 : #define SCSI_LOG_SCAN_BITS 3
31 : #define SCSI_LOG_MLQUEUE_BITS 3
32 : #define SCSI_LOG_MLCOMPLETE_BITS 3
33 : #define SCSI_LOG_LLQUEUE_BITS 3
34 : #define SCSI_LOG_LLCOMPLETE_BITS 3
35 : #define SCSI_LOG_HLQUEUE_BITS 3
36 : #define SCSI_LOG_HLCOMPLETE_BITS 3
37 : #define SCSI_LOG_IOCTL_BITS 3
38 :
39 1 : extern unsigned int scsi_logging_level;
40 1 :
41 : #ifdef CONFIG_SCSI_LOGGING
42 :
43 : #define SCSI_LOG_LEVEL(SHIFT, BITS) \
44 : ((scsi_logging_level >> (SHIFT)) & ((1 << (BITS)) - 1))
45 :
46 : #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \
47 : do { \
48 : if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \
49 : do { \
50 : CMD; \
51 : } while (0); \
52 : } while (0)
53 : #else
54 : #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD)
55 : #endif /* CONFIG_SCSI_LOGGING */
56 :
57 : /*
58 : * These are the macros that are actually used throughout the code to
59 : * log events. If logging isn't enabled, they are no-ops and will be
60 : * completely absent from the user's code.
61 : */
62 : #define SCSI_LOG_ERROR_RECOVERY(LEVEL,CMD) \
63 : SCSI_CHECK_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD);
64 : #define SCSI_LOG_TIMEOUT(LEVEL,CMD) \
65 : SCSI_CHECK_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL,CMD);
66 : #define SCSI_LOG_SCAN_BUS(LEVEL,CMD) \
67 : SCSI_CHECK_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL,CMD);
68 : #define SCSI_LOG_MLQUEUE(LEVEL,CMD) \
69 : SCSI_CHECK_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL,CMD);
70 : #define SCSI_LOG_MLCOMPLETE(LEVEL,CMD) \
71 : SCSI_CHECK_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL,CMD);
72 : #define SCSI_LOG_LLQUEUE(LEVEL,CMD) \
73 : SCSI_CHECK_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL,CMD);
74 : #define SCSI_LOG_LLCOMPLETE(LEVEL,CMD) \
75 : SCSI_CHECK_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL,CMD);
76 : #define SCSI_LOG_HLQUEUE(LEVEL,CMD) \
77 : SCSI_CHECK_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL,CMD);
78 : #define SCSI_LOG_HLCOMPLETE(LEVEL,CMD) \
79 : SCSI_CHECK_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL,CMD);
80 : #define SCSI_LOG_IOCTL(LEVEL,CMD) \
81 : SCSI_CHECK_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL,CMD);
82 :
83 : #endif /* _SCSI_LOGGING_H */
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