linux/drivers/scsi/scsi_logging.h
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   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
  39extern unsigned int scsi_logging_level;
  40
  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)             \
  47do {                                                            \
  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 */
  84
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