diff options
Diffstat (limited to 'drivers/scsi/scsi_logging.h')
| -rw-r--r-- | drivers/scsi/scsi_logging.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_logging.h b/drivers/scsi/scsi_logging.h new file mode 100644 index 000000000..3df877886 --- /dev/null +++ b/drivers/scsi/scsi_logging.h @@ -0,0 +1,85 @@ +/* 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 10 3-bit + * bitfields, 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) do { } while (0) +#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 */ |