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70f2356d36
The CAM_DEBUG* macros use multiple printfs to dump the data. This is suboptimal when tracing things that produce even a moderate amount since it gets intertwingled. I can't even turn on tracing with a 24-disk HBA on boot without it getting messed up. Add helper routines to work around clang's over-use of the stack: that way we only pay the stack penalty when a trace hits. Sponsored by: Netflix Reviewed by: ken, mav Differential Revision: https://reviews.freebsd.org/D42411
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/*-
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* Macros for tracing/loging information in the CAM layer
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _CAM_CAM_DEBUG_H
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#define _CAM_CAM_DEBUG_H 1
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/*
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* Debugging flags.
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*/
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typedef enum {
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CAM_DEBUG_NONE = 0x00, /* no debugging */
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CAM_DEBUG_INFO = 0x01, /* scsi commands, errors, data */
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CAM_DEBUG_TRACE = 0x02, /* routine flow tracking */
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CAM_DEBUG_SUBTRACE = 0x04, /* internal to routine flows */
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CAM_DEBUG_CDB = 0x08, /* print out SCSI CDBs only */
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CAM_DEBUG_XPT = 0x10, /* print out xpt scheduling */
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CAM_DEBUG_PERIPH = 0x20, /* print out peripheral calls */
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CAM_DEBUG_PROBE = 0x40 /* print out probe actions */
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} cam_debug_flags;
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#if defined(_KERNEL)
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#ifndef CAM_DEBUG_FLAGS
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#define CAM_DEBUG_FLAGS CAM_DEBUG_NONE
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#endif
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#ifndef CAM_DEBUG_COMPILE
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#ifdef CAMDEBUG
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#define CAM_DEBUG_COMPILE (-1)
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#else
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#define CAM_DEBUG_COMPILE (CAM_DEBUG_INFO | CAM_DEBUG_CDB | \
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CAM_DEBUG_PERIPH | CAM_DEBUG_PROBE | \
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CAM_DEBUG_FLAGS)
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#endif
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#endif
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#ifndef CAM_DEBUG_BUS
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#define CAM_DEBUG_BUS CAM_BUS_WILDCARD
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#endif
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#ifndef CAM_DEBUG_TARGET
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#define CAM_DEBUG_TARGET CAM_TARGET_WILDCARD
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#endif
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#ifndef CAM_DEBUG_LUN
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#define CAM_DEBUG_LUN CAM_LUN_WILDCARD
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#endif
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#ifndef CAM_DEBUG_DELAY
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#define CAM_DEBUG_DELAY 0
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#endif
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/* Path we want to debug */
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extern struct cam_path *cam_dpath;
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/* Current debug levels set */
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extern uint32_t cam_dflags;
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/* Printf delay value (to prevent scrolling) */
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extern uint32_t cam_debug_delay;
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/* Helper routines -- helps conserve stack */
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struct cam_ed;
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void xpt_cam_path_debug(struct cam_path *path, const char *fmt, ...);
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void xpt_cam_dev_debug(struct cam_ed *dev, const char *fmt, ...);
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void xpt_cam_debug(const char *fmt, ...);
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/* Stupid macro to remove a layer of parens */
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#define _CAM_X(...) __VA_ARGS__
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/* Debugging macros. */
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#define CAM_DEBUGGED(path, flag) \
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(((flag) & (CAM_DEBUG_COMPILE) & cam_dflags) \
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&& (cam_dpath != NULL) \
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&& (xpt_path_comp(cam_dpath, (path)) >= 0) \
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&& (xpt_path_comp(cam_dpath, (path)) < 2))
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#define CAM_DEBUG(path, flag, printfargs) \
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if (CAM_DEBUGGED(path, flag)) { \
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xpt_cam_path_debug(path, _CAM_X printfargs); \
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}
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#define CAM_DEBUG_DEV(dev, flag, printfargs) \
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if (((flag) & (CAM_DEBUG_COMPILE) & cam_dflags) \
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&& (cam_dpath != NULL) \
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&& (xpt_path_comp_dev(cam_dpath, (dev)) >= 0) \
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&& (xpt_path_comp_dev(cam_dpath, (dev)) < 2)) { \
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xpt_cam_dev_debug(dev, _CAM_X printfargs); \
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}
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#define CAM_DEBUG_PRINT(flag, printfargs) \
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if (((flag) & (CAM_DEBUG_COMPILE) & cam_dflags)) { \
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xpt_cam_debug(_CAM_X printfargs); \
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}
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#else /* !_KERNEL */
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#define CAM_DEBUGGED(A, B) 0
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#define CAM_DEBUG(A, B, C)
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#define CAM_DEBUG_DEV(A, B, C)
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#define CAM_DEBUG_PRINT(A, B)
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#endif /* _KERNEL */
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#endif /* _CAM_CAM_DEBUG_H */
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