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drivers/scsi/scsi_logging.h
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SCSI_LOGGING_H
#define _SCSI_LOGGING_H
/*
* This defines the scsi logging feature. It is a means by which the user
* can select how much information they get about various goings on, and it
* can be really useful for fault tracing. The logging word is divided into
* 8 nibbles, each of which describes a loglevel. The division of things is
* somewhat arbitrary, and the division of the word could be changed if it
* were really needed for any reason. The numbers below are the only place
* where these are specified. For a first go-around, 3 bits is more than
* enough, since this gives 8 levels of logging (really 7, since 0 is always
* off). Cutting to 2 bits might be wise at some point.
*/
#define SCSI_LOG_ERROR_SHIFT 0
#define SCSI_LOG_TIMEOUT_SHIFT 3
#define SCSI_LOG_SCAN_SHIFT 6
#define SCSI_LOG_MLQUEUE_SHIFT 9
#define SCSI_LOG_MLCOMPLETE_SHIFT 12
#define SCSI_LOG_LLQUEUE_SHIFT 15
#define SCSI_LOG_LLCOMPLETE_SHIFT 18
#define SCSI_LOG_HLQUEUE_SHIFT 21
#define SCSI_LOG_HLCOMPLETE_SHIFT 24
#define SCSI_LOG_IOCTL_SHIFT 27
#define SCSI_LOG_ERROR_BITS 3
#define SCSI_LOG_TIMEOUT_BITS 3
#define SCSI_LOG_SCAN_BITS 3
#define SCSI_LOG_MLQUEUE_BITS 3
#define SCSI_LOG_MLCOMPLETE_BITS 3
#define SCSI_LOG_LLQUEUE_BITS 3
#define SCSI_LOG_LLCOMPLETE_BITS 3
#define SCSI_LOG_HLQUEUE_BITS 3
#define SCSI_LOG_HLCOMPLETE_BITS 3
#define SCSI_LOG_IOCTL_BITS 3
extern unsigned int scsi_logging_level;
#ifdef CONFIG_SCSI_LOGGING
#define SCSI_LOG_LEVEL(SHIFT, BITS) \
((scsi_logging_level >> (SHIFT)) & ((1 << (BITS)) - 1))
#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \
do { \
if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \
do { \
CMD; \
} while (0); \
} while (0)
#else
#define SCSI_LOG_LEVEL(SHIFT, BITS) 0
#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD)
#endif /* CONFIG_SCSI_LOGGING */
/*
* These are the macros that are actually used throughout the code to
* log events. If logging isn't enabled, they are no-ops and will be
* completely absent from the user's code.
*/
#define SCSI_LOG_ERROR_RECOVERY(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD);
#define SCSI_LOG_TIMEOUT(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL,CMD);
#define SCSI_LOG_SCAN_BUS(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL,CMD);
#define SCSI_LOG_MLQUEUE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL,CMD);
#define SCSI_LOG_MLCOMPLETE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL,CMD);
#define SCSI_LOG_LLQUEUE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL,CMD);
#define SCSI_LOG_LLCOMPLETE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL,CMD);
#define SCSI_LOG_HLQUEUE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL,CMD);
#define SCSI_LOG_HLCOMPLETE(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL,CMD);
#define SCSI_LOG_IOCTL(LEVEL,CMD) \
SCSI_CHECK_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL,CMD);
#endif /* _SCSI_LOGGING_H */
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