scsi_logging.h (3664B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _SCSI_LOGGING_H 3#define _SCSI_LOGGING_H 4 5 6/* 7 * This defines the scsi logging feature. It is a means by which the user can 8 * select how much information they get about various goings on, and it can be 9 * really useful for fault tracing. The logging word is divided into 10 3-bit 10 * bitfields, each of which describes a loglevel. The division of things is 11 * somewhat arbitrary, and the division of the word could be changed if it 12 * were really needed for any reason. The numbers below are the only place 13 * where these are specified. For a first go-around, 3 bits is more than 14 * enough, since this gives 8 levels of logging (really 7, since 0 is always 15 * off). Cutting to 2 bits might be wise at some point. 16 */ 17 18#define SCSI_LOG_ERROR_SHIFT 0 19#define SCSI_LOG_TIMEOUT_SHIFT 3 20#define SCSI_LOG_SCAN_SHIFT 6 21#define SCSI_LOG_MLQUEUE_SHIFT 9 22#define SCSI_LOG_MLCOMPLETE_SHIFT 12 23#define SCSI_LOG_LLQUEUE_SHIFT 15 24#define SCSI_LOG_LLCOMPLETE_SHIFT 18 25#define SCSI_LOG_HLQUEUE_SHIFT 21 26#define SCSI_LOG_HLCOMPLETE_SHIFT 24 27#define SCSI_LOG_IOCTL_SHIFT 27 28 29#define SCSI_LOG_ERROR_BITS 3 30#define SCSI_LOG_TIMEOUT_BITS 3 31#define SCSI_LOG_SCAN_BITS 3 32#define SCSI_LOG_MLQUEUE_BITS 3 33#define SCSI_LOG_MLCOMPLETE_BITS 3 34#define SCSI_LOG_LLQUEUE_BITS 3 35#define SCSI_LOG_LLCOMPLETE_BITS 3 36#define SCSI_LOG_HLQUEUE_BITS 3 37#define SCSI_LOG_HLCOMPLETE_BITS 3 38#define SCSI_LOG_IOCTL_BITS 3 39 40extern unsigned int scsi_logging_level; 41 42#ifdef CONFIG_SCSI_LOGGING 43 44#define SCSI_LOG_LEVEL(SHIFT, BITS) \ 45 ((scsi_logging_level >> (SHIFT)) & ((1 << (BITS)) - 1)) 46 47#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \ 48do { \ 49 if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \ 50 do { \ 51 CMD; \ 52 } while (0); \ 53} while (0) 54#else 55#define SCSI_LOG_LEVEL(SHIFT, BITS) 0 56#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) do { } while (0) 57#endif /* CONFIG_SCSI_LOGGING */ 58 59/* 60 * These are the macros that are actually used throughout the code to 61 * log events. If logging isn't enabled, they are no-ops and will be 62 * completely absent from the user's code. 63 */ 64#define SCSI_LOG_ERROR_RECOVERY(LEVEL,CMD) \ 65 SCSI_CHECK_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD); 66#define SCSI_LOG_TIMEOUT(LEVEL,CMD) \ 67 SCSI_CHECK_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL,CMD); 68#define SCSI_LOG_SCAN_BUS(LEVEL,CMD) \ 69 SCSI_CHECK_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL,CMD); 70#define SCSI_LOG_MLQUEUE(LEVEL,CMD) \ 71 SCSI_CHECK_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL,CMD); 72#define SCSI_LOG_MLCOMPLETE(LEVEL,CMD) \ 73 SCSI_CHECK_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL,CMD); 74#define SCSI_LOG_LLQUEUE(LEVEL,CMD) \ 75 SCSI_CHECK_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL,CMD); 76#define SCSI_LOG_LLCOMPLETE(LEVEL,CMD) \ 77 SCSI_CHECK_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL,CMD); 78#define SCSI_LOG_HLQUEUE(LEVEL,CMD) \ 79 SCSI_CHECK_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL,CMD); 80#define SCSI_LOG_HLCOMPLETE(LEVEL,CMD) \ 81 SCSI_CHECK_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL,CMD); 82#define SCSI_LOG_IOCTL(LEVEL,CMD) \ 83 SCSI_CHECK_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL,CMD); 84 85#endif /* _SCSI_LOGGING_H */