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![Wolfgang Denk](/assets/img/avatar_default.png)
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
367 lines
9.3 KiB
C
367 lines
9.3 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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#include <common.h>
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#include <trace.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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DECLARE_GLOBAL_DATA_PTR;
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static char trace_enabled __attribute__((section(".data")));
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static char trace_inited __attribute__((section(".data")));
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/* The header block at the start of the trace memory area */
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struct trace_hdr {
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int func_count; /* Total number of function call sites */
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u64 call_count; /* Total number of tracked function calls */
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u64 untracked_count; /* Total number of untracked function calls */
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int funcs_used; /* Total number of functions used */
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/*
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* Call count for each function. This is indexed by the word offset
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* of the function from gd->relocaddr
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*/
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uintptr_t *call_accum;
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/* Function trace list */
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struct trace_call *ftrace; /* The function call records */
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ulong ftrace_size; /* Num. of ftrace records we have space for */
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ulong ftrace_count; /* Num. of ftrace records written */
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ulong ftrace_too_deep_count; /* Functions that were too deep */
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int depth;
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int depth_limit;
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int max_depth;
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};
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static struct trace_hdr *hdr; /* Pointer to start of trace buffer */
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static inline uintptr_t __attribute__((no_instrument_function))
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func_ptr_to_num(void *func_ptr)
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{
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uintptr_t offset = (uintptr_t)func_ptr;
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#ifdef CONFIG_SANDBOX
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offset -= (uintptr_t)&_init;
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#else
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if (gd->flags & GD_FLG_RELOC)
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offset -= gd->relocaddr;
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else
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offset -= CONFIG_SYS_TEXT_BASE;
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#endif
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return offset / FUNC_SITE_SIZE;
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}
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static void __attribute__((no_instrument_function)) add_ftrace(void *func_ptr,
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void *caller, ulong flags)
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{
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if (hdr->depth > hdr->depth_limit) {
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hdr->ftrace_too_deep_count++;
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return;
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}
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if (hdr->ftrace_count < hdr->ftrace_size) {
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struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];
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rec->func = func_ptr_to_num(func_ptr);
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rec->caller = func_ptr_to_num(caller);
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rec->flags = flags | (timer_get_us() & FUNCF_TIMESTAMP_MASK);
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}
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hdr->ftrace_count++;
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}
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static void __attribute__((no_instrument_function)) add_textbase(void)
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{
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if (hdr->ftrace_count < hdr->ftrace_size) {
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struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];
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rec->func = CONFIG_SYS_TEXT_BASE;
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rec->caller = 0;
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rec->flags = FUNCF_TEXTBASE;
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}
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hdr->ftrace_count++;
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}
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/**
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* This is called on every function entry
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*
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* We add to our tally for this function and add to the list of called
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* functions.
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*
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* @param func_ptr Pointer to function being entered
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* @param caller Pointer to function which called this function
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*/
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void __attribute__((no_instrument_function)) __cyg_profile_func_enter(
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void *func_ptr, void *caller)
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{
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if (trace_enabled) {
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int func;
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add_ftrace(func_ptr, caller, FUNCF_ENTRY);
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func = func_ptr_to_num(func_ptr);
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if (func < hdr->func_count) {
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hdr->call_accum[func]++;
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hdr->call_count++;
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} else {
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hdr->untracked_count++;
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}
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hdr->depth++;
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if (hdr->depth > hdr->depth_limit)
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hdr->max_depth = hdr->depth;
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}
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}
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/**
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* This is called on every function exit
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*
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* We do nothing here.
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*
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* @param func_ptr Pointer to function being entered
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* @param caller Pointer to function which called this function
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*/
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void __attribute__((no_instrument_function)) __cyg_profile_func_exit(
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void *func_ptr, void *caller)
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{
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if (trace_enabled) {
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add_ftrace(func_ptr, caller, FUNCF_EXIT);
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hdr->depth--;
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}
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}
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/**
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* Produce a list of called functions
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*
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* The information is written into the supplied buffer - a header followed
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* by a list of function records.
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*
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* @param buff Buffer to place list into
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* @param buff_size Size of buffer
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* @param needed Returns size of buffer needed, which may be
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* greater than buff_size if we ran out of space.
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* @return 0 if ok, -1 if space was exhausted
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*/
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int trace_list_functions(void *buff, int buff_size, unsigned int *needed)
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{
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struct trace_output_hdr *output_hdr = NULL;
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void *end, *ptr = buff;
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int func;
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int upto;
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end = buff ? buff + buff_size : NULL;
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/* Place some header information */
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if (ptr + sizeof(struct trace_output_hdr) < end)
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output_hdr = ptr;
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ptr += sizeof(struct trace_output_hdr);
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/* Add information about each function */
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for (func = upto = 0; func < hdr->func_count; func++) {
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int calls = hdr->call_accum[func];
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if (!calls)
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continue;
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if (ptr + sizeof(struct trace_output_func) < end) {
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struct trace_output_func *stats = ptr;
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stats->offset = func * FUNC_SITE_SIZE;
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stats->call_count = calls;
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upto++;
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}
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ptr += sizeof(struct trace_output_func);
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}
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/* Update the header */
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if (output_hdr) {
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output_hdr->rec_count = upto;
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output_hdr->type = TRACE_CHUNK_FUNCS;
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}
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/* Work out how must of the buffer we used */
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*needed = ptr - buff;
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if (ptr > end)
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return -1;
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return 0;
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}
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int trace_list_calls(void *buff, int buff_size, unsigned *needed)
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{
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struct trace_output_hdr *output_hdr = NULL;
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void *end, *ptr = buff;
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int rec, upto;
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int count;
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end = buff ? buff + buff_size : NULL;
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/* Place some header information */
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if (ptr + sizeof(struct trace_output_hdr) < end)
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output_hdr = ptr;
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ptr += sizeof(struct trace_output_hdr);
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/* Add information about each call */
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count = hdr->ftrace_count;
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if (count > hdr->ftrace_size)
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count = hdr->ftrace_size;
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for (rec = upto = 0; rec < count; rec++) {
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if (ptr + sizeof(struct trace_call) < end) {
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struct trace_call *call = &hdr->ftrace[rec];
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struct trace_call *out = ptr;
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out->func = call->func * FUNC_SITE_SIZE;
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out->caller = call->caller * FUNC_SITE_SIZE;
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out->flags = call->flags;
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upto++;
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}
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ptr += sizeof(struct trace_call);
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}
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/* Update the header */
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if (output_hdr) {
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output_hdr->rec_count = upto;
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output_hdr->type = TRACE_CHUNK_CALLS;
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}
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/* Work out how must of the buffer we used */
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*needed = ptr - buff;
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if (ptr > end)
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return -1;
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return 0;
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}
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/* Print basic information about tracing */
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void trace_print_stats(void)
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{
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ulong count;
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#ifndef FTRACE
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puts("Warning: make U-Boot with FTRACE to enable function instrumenting.\n");
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puts("You will likely get zeroed data here\n");
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#endif
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if (!trace_inited) {
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printf("Trace is disabled\n");
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return;
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}
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print_grouped_ull(hdr->func_count, 10);
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puts(" function sites\n");
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print_grouped_ull(hdr->call_count, 10);
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puts(" function calls\n");
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print_grouped_ull(hdr->untracked_count, 10);
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puts(" untracked function calls\n");
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count = min(hdr->ftrace_count, hdr->ftrace_size);
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print_grouped_ull(count, 10);
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puts(" traced function calls");
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if (hdr->ftrace_count > hdr->ftrace_size) {
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printf(" (%lu dropped due to overflow)",
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hdr->ftrace_count - hdr->ftrace_size);
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}
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puts("\n");
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printf("%15d maximum observed call depth\n", hdr->max_depth);
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printf("%15d call depth limit\n", hdr->depth_limit);
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print_grouped_ull(hdr->ftrace_too_deep_count, 10);
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puts(" calls not traced due to depth\n");
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}
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void __attribute__((no_instrument_function)) trace_set_enabled(int enabled)
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{
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trace_enabled = enabled != 0;
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}
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/**
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* Init the tracing system ready for used, and enable it
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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 __attribute__((no_instrument_function)) trace_init(void *buff,
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size_t buff_size)
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{
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ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
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size_t needed;
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int was_disabled = !trace_enabled;
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if (!was_disabled) {
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#ifdef CONFIG_TRACE_EARLY
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char *end;
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ulong used;
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/*
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* Copy over the early trace data if we have it. Disable
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* tracing while we are doing this.
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*/
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trace_enabled = 0;
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hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR,
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CONFIG_TRACE_EARLY_SIZE);
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end = (char *)&hdr->ftrace[hdr->ftrace_count];
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used = end - (char *)hdr;
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printf("trace: copying %08lx bytes of early data from %x to %08lx\n",
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used, CONFIG_TRACE_EARLY_ADDR,
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(ulong)map_to_sysmem(buff));
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memcpy(buff, hdr, used);
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#else
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puts("trace: already enabled\n");
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return -1;
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#endif
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}
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hdr = (struct trace_hdr *)buff;
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needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
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if (needed > buff_size) {
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printf("trace: buffer size %zd bytes: at least %zd needed\n",
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buff_size, needed);
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return -1;
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}
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if (was_disabled)
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memset(hdr, '\0', needed);
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hdr->func_count = func_count;
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hdr->call_accum = (uintptr_t *)(hdr + 1);
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/* Use any remaining space for the timed function trace */
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hdr->ftrace = (struct trace_call *)(buff + needed);
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hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
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add_textbase();
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puts("trace: enabled\n");
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hdr->depth_limit = 15;
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trace_enabled = 1;
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trace_inited = 1;
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return 0;
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}
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#ifdef CONFIG_TRACE_EARLY
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int __attribute__((no_instrument_function)) trace_early_init(void)
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{
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ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
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size_t buff_size = CONFIG_TRACE_EARLY_SIZE;
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size_t needed;
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/* We can ignore additional calls to this function */
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if (trace_enabled)
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return 0;
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hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR, CONFIG_TRACE_EARLY_SIZE);
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needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
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if (needed > buff_size) {
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printf("trace: buffer size is %zd bytes, at least %zd needed\n",
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buff_size, needed);
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return -1;
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}
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memset(hdr, '\0', needed);
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hdr->call_accum = (uintptr_t *)(hdr + 1);
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hdr->func_count = func_count;
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/* Use any remaining space for the timed function trace */
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hdr->ftrace = (struct trace_call *)((char *)hdr + needed);
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hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
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add_textbase();
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hdr->depth_limit = 200;
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printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR);
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trace_enabled = 1;
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return 0;
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}
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#endif
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