qdf/linux/src/i_qdf_trace.h

/*
 * Copyright (c) 2014-2018 The Linux Foundation. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/**
 * DOC: i_qdf_trace.h
 *
 * Linux-specific definitions for QDF trace
 *
 */

#if !defined(__I_QDF_TRACE_H)
#define __I_QDF_TRACE_H

/* older kernels have a bug in kallsyms, so ensure module.h is included */
#include <linux/module.h>
#include <linux/kallsyms.h>

#if !defined(__printf)
#define __printf(a, b)
#endif

#ifdef CONFIG_MCL
/* QDF_TRACE is the macro invoked to add trace messages to code.  See the
 * documenation for qdf_trace_msg() for the parameters etc. for this function.
 *
 * NOTE:  Code QDF_TRACE() macros into the source code.  Do not code directly
 * to the qdf_trace_msg() function.
 *
 * NOTE 2:  qdf tracing is totally turned off if WLAN_DEBUG is *not* defined.
 * This allows us to build 'performance' builds where we can measure performance
 * without being bogged down by all the tracing in the code
 */
#if defined(WLAN_DEBUG) || defined(DEBUG)
#define QDF_TRACE qdf_trace_msg
#define QDF_VTRACE qdf_vtrace_msg
#define QDF_TRACE_HEX_DUMP qdf_trace_hex_dump
#define QDF_MAX_LOGS_PER_SEC 2
/**
 * __QDF_TRACE_RATE_LIMITED() - rate limited version of QDF_TRACE
 * @params: parameters to pass through to QDF_TRACE
 *
 * This API prevents logging a message more than QDF_MAX_LOGS_PER_SEC times per
 * second. This means any subsequent calls to this API from the same location
 * within 1/QDF_MAX_LOGS_PER_SEC seconds will be dropped.
 *
 * Return: None
 */
#define __QDF_TRACE_RATE_LIMITED(params...)\
	do {\
		static ulong __last_ticks;\
		ulong __ticks = jiffies;\
		if (time_after(__ticks,\
			       __last_ticks + HZ / QDF_MAX_LOGS_PER_SEC)) {\
			QDF_TRACE(params);\
			__last_ticks = __ticks;\
		} \
	} while (0)
#else
#define QDF_TRACE(arg ...)
#define QDF_VTRACE(arg ...)
#define QDF_TRACE_HEX_DUMP(arg ...)
#define __QDF_TRACE_RATE_LIMITED(arg ...)
#endif
#else /* CONFIG_MCL */

#define qdf_trace(log_level, args...) \
		do {	\
			extern int qdf_dbg_mask; \
			if (qdf_dbg_mask >= log_level) { \
				printk(args); \
				printk("\n"); \
			} \
		} while (0)

#define QDF_TRACE qdf_trace_msg

#define QDF_VTRACE qdf_vtrace_msg
#define QDF_TRACE_HEX_DUMP qdf_trace_hex_dump
#endif /* CONFIG_MCL */

#define __QDF_TRACE_FL(log_level, module_id, format, args...) \
	QDF_TRACE(module_id, log_level, FL(format), ## args)

#define __QDF_TRACE_RL(log_level, module_id, format, args...) \
	__QDF_TRACE_RATE_LIMITED(module_id, log_level, FL(format), ## args)

static inline void __qdf_trace_noop(QDF_MODULE_ID module, char *format, ...) { }

#ifdef WLAN_LOG_FATAL
#define QDF_TRACE_FATAL(params...) \
	__QDF_TRACE_FL(QDF_TRACE_LEVEL_FATAL, ## params)
#define QDF_TRACE_FATAL_RL(params...) \
	__QDF_TRACE_RL(QDF_TRACE_LEVEL_FATAL, ## params)
#else
#define QDF_TRACE_FATAL(params...) __qdf_trace_noop(params)
#define QDF_TRACE_FATAL_RL(params...) __qdf_trace_noop(params)
#endif

#ifdef WLAN_LOG_ERROR
#define QDF_TRACE_ERROR(params...) \
	__QDF_TRACE_FL(QDF_TRACE_LEVEL_ERROR, ## params)
#define QDF_TRACE_ERROR_RL(params...) \
	__QDF_TRACE_RL(QDF_TRACE_LEVEL_ERROR, ## params)
#else
#define QDF_TRACE_ERROR(params...) __qdf_trace_noop(params)
#define QDF_TRACE_ERROR_RL(params...) __qdf_trace_noop(params)
#endif

#ifdef WLAN_LOG_WARN
#define QDF_TRACE_WARN(params...) \
	__QDF_TRACE_FL(QDF_TRACE_LEVEL_WARN, ## params)
#define QDF_TRACE_WARN_RL(params...) \
	__QDF_TRACE_RL(QDF_TRACE_LEVEL_WARN, ## params)
#else
#define QDF_TRACE_WARN(params...) __qdf_trace_noop(params)
#define QDF_TRACE_WARN_RL(params...) __qdf_trace_noop(params)
#endif

#ifdef WLAN_LOG_INFO
#define QDF_TRACE_INFO(params...) \
	__QDF_TRACE_FL(QDF_TRACE_LEVEL_INFO, ## params)
#define QDF_TRACE_INFO_RL(params...) \
	__QDF_TRACE_RL(QDF_TRACE_LEVEL_INFO, ## params)
#else
#define QDF_TRACE_INFO(params...) __qdf_trace_noop(params)
#define QDF_TRACE_INFO_RL(params...) __qdf_trace_noop(params)
#endif

#ifdef WLAN_LOG_DEBUG
#define QDF_TRACE_DEBUG(params...) \
	__QDF_TRACE_FL(QDF_TRACE_LEVEL_DEBUG, ## params)
#define QDF_TRACE_DEBUG_RL(params...) \
	__QDF_TRACE_RL(QDF_TRACE_LEVEL_DEBUG, ## params)
#else
#define QDF_TRACE_DEBUG(params...) __qdf_trace_noop(params)
#define QDF_TRACE_DEBUG_RL(params...) __qdf_trace_noop(params)
#endif

#define QDF_ENABLE_TRACING
#define qdf_scnprintf scnprintf

#ifdef QDF_ENABLE_TRACING

#ifdef WLAN_WARN_ON_ASSERT
#define QDF_ASSERT(_condition) \
	do { \
		if (!(_condition)) { \
			pr_err("QDF ASSERT in %s Line %d\n", \
			       __func__, __LINE__); \
			WARN_ON(1); \
		} \
	} while (0)
#else
#define QDF_ASSERT(_condition) \
	do { \
		if (!(_condition)) { \
			/* no-op */ \
		} \
	} while (0)
#endif /* WLAN_WARN_ON_ASSERT */

#else

/* This code will be used for compilation if tracing is to be compiled out */
/* of the code so these functions/macros are 'do nothing' */
static inline void qdf_trace_msg(QDF_MODULE_ID module, QDF_TRACE_LEVEL level,
		   char *str_format, ...)
{
}

#define QDF_ASSERT(_condition)

#endif

#ifdef PANIC_ON_BUG
#ifdef CONFIG_SLUB_DEBUG
/**
 * QDF_DEBUG_PANIC() - Causes a panic if PANIC_ON_BUG option is enabled
 *
 * Note: Calling panic can cause a compiler to assume any following code is
 * unreachable. Because these panics may or may not be enabled by the build
 * configuration, this can cause developers some pain. Consider:
 *
 *	bool bit;
 *
 *	if (ptr)
 *		bit = ptr->returns_bool();
 *	else
 *		panic();
 *
 *	// do stuff with @bit
 *
 *	return bit;
 *
 * In this case, @bit is potentially uninitialized when we return! However, the
 * compiler can correctly assume this case is impossible when PANIC_ON_BUG is
 * enabled. Because developers typically enable this feature, the "maybe
 * uninitialized" warning will not be emitted, and the bug remains uncaught
 * until someone tries to make a build without PANIC_ON_BUG.
 *
 * A simple workaround for this, is to put the definition of QDF_DEBUG_PANIC in
 * another compilation unit, which prevents the compiler from assuming
 * subsequent code is unreachable. For CONFIG_SLUB_DEBUG, do this to catch more
 * bugs. Otherwise, use the typical inlined approach.
 *
 * Return: None
 */
void QDF_DEBUG_PANIC(void);
#else
static inline void QDF_DEBUG_PANIC(void)
{
	BUG();
}
#endif /* CONFIG_SLUB_DEBUG */

#define QDF_BUG(_condition) \
	do { \
		if (!(_condition)) { \
			pr_err("QDF BUG in %s Line %d: Failed assertion '" \
			       #_condition "'\n", __func__, __LINE__); \
			QDF_DEBUG_PANIC(); \
		} \
	} while (0)

#else

static inline void QDF_DEBUG_PANIC(void) { }

#define QDF_BUG(_condition) \
	do { \
		if (!(_condition)) { \
			/* no-op */ \
		} \
	} while (0)
#endif /* PANIC_ON_BUG */

#ifdef KSYM_SYMBOL_LEN
#define __QDF_SYMBOL_LEN KSYM_SYMBOL_LEN
#else
#define __QDF_SYMBOL_LEN 1
#endif

#endif /* __I_QDF_TRACE_H */