1 #ifndef _SCSI_LOGGING_H 2 #define _SCSI_LOGGING_H 3 4 #include <linux/config.h> 5 6 /* 7 * This defines the scsi logging feature. It is a means by which the user 8 * can select how much information they get about various goings on, and it 9 * can be really useful for fault tracing. The logging word is divided into 10 * 8 nibbles, 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 40 extern 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) \ 48 { \ 49 if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \ 50 (CMD); \ 51 } 52 #else 53 #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) 54 #endif /* CONFIG_SCSI_LOGGING */ 55 56 /* 57 * These are the macros that are actually used throughout the code to 58 * log events. If logging isn't enabled, they are no-ops and will be 59 * completely absent from the user's code. 60 */ 61 #define SCSI_LOG_ERROR_RECOVERY(LEVEL,CMD) \ 62 SCSI_CHECK_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD); 63 #define SCSI_LOG_TIMEOUT(LEVEL,CMD) \ 64 SCSI_CHECK_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL,CMD); 65 #define SCSI_LOG_SCAN_BUS(LEVEL,CMD) \ 66 SCSI_CHECK_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL,CMD); 67 #define SCSI_LOG_MLQUEUE(LEVEL,CMD) \ 68 SCSI_CHECK_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL,CMD); 69 #define SCSI_LOG_MLCOMPLETE(LEVEL,CMD) \ 70 SCSI_CHECK_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL,CMD); 71 #define SCSI_LOG_LLQUEUE(LEVEL,CMD) \ 72 SCSI_CHECK_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL,CMD); 73 #define SCSI_LOG_LLCOMPLETE(LEVEL,CMD) \ 74 SCSI_CHECK_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL,CMD); 75 #define SCSI_LOG_HLQUEUE(LEVEL,CMD) \ 76 SCSI_CHECK_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL,CMD); 77 #define SCSI_LOG_HLCOMPLETE(LEVEL,CMD) \ 78 SCSI_CHECK_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL,CMD); 79 #define SCSI_LOG_IOCTL(LEVEL,CMD) \ 80 SCSI_CHECK_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL,CMD); 81 82 #endif /* _SCSI_LOGGING_H */ 83