106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/*
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* Copyright (c) 2012 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __TRACE_H
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#define __TRACE_H
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enum {
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/*
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* This affects the granularity of our trace. We can bin function
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* entry points into groups on the basis that functions typically
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* have a minimum size, so entry points can't appear any closer
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* than this to each other.
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*
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* The value here assumes a minimum instruction size of 4 bytes,
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* or that instructions are 2 bytes but there are at least 2 of
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* them in every function.
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*
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* Increasing this value reduces the number of functions we can
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* resolve, but reduces the size of the uintptr_t array used for
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* our function list, which is the length of the code divided by
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* this value.
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*/
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FUNC_SITE_SIZE = 4, /* distance between function sites */
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};
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enum trace_chunk_type {
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TRACE_CHUNK_FUNCS,
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TRACE_CHUNK_CALLS,
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};
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/* A trace record for a function, as written to the profile output file */
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struct trace_output_func {
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uint32_t offset; /* Function offset into code */
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uint32_t call_count; /* Number of times called */
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};
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/* A header at the start of the trace output buffer */
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struct trace_output_hdr {
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enum trace_chunk_type type; /* Record type */
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uint32_t rec_count; /* Number of records */
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};
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/* Print statistics about traced function calls */
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void trace_print_stats(void);
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/**
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* Dump a list of functions and call counts into a buffer
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*
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* Each record in the buffer is a struct trace_func_stats. The 'needed'
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* parameter returns the number of bytes needed to complete the operation,
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* which may be more than buff_size if your buffer is too small.
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*
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* @param buff Buffer in which to place data, or NULL to count size
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* @param buff_size Size of buffer
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* @param needed Returns number of bytes used / needed
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* @return 0 if ok, -1 on error (buffer exhausted)
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*/
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int trace_list_functions(void *buff, int buff_size, unsigned *needed);
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/* Flags for ftrace_record */
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enum ftrace_flags {
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FUNCF_EXIT = 0UL << 30,
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FUNCF_ENTRY = 1UL << 30,
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FUNCF_TEXTBASE = 2UL << 30,
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FUNCF_TIMESTAMP_MASK = 0x3fffffff,
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};
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#define TRACE_CALL_TYPE(call) ((call)->flags & 0xc0000000UL)
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/* Information about a single function entry/exit */
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struct trace_call {
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uint32_t func; /* Function offset */
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uint32_t caller; /* Caller function offset */
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uint32_t flags; /* Flags and timestamp */
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};
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int trace_list_calls(void *buff, int buff_size, unsigned int *needed);
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/**
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* Turn function tracing on and off
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*
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* Don't enable trace if it has not been initialised.
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*
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* @param enabled 1 to enable trace, 0 to disable
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*/
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void trace_set_enabled(int enabled);
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int trace_early_init(void);
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/**
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* Init the trace system
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*
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* This should be called after relocation with a suitably large buffer
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* (typically as large as the U-Boot text area)
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*
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* @param buff Pointer to trace buffer
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* @param buff_size Size of trace buffer
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*/
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int trace_init(void *buff, size_t buff_size);
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#endif
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