[thirdparty/u-boot.git] / lib / trace.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2012 The Chromium OS Authors.
 */

#include <common.h>
#include <mapmem.h>
#include <time.h>
#include <trace.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/sections.h>

DECLARE_GLOBAL_DATA_PTR;

static char trace_enabled __section(".data");
static char trace_inited __section(".data");

/* The header block at the start of the trace memory area */
struct trace_hdr {
	int func_count;		/* Total number of function call sites */
	u64 call_count;		/* Total number of tracked function calls */
	u64 untracked_count;	/* Total number of untracked function calls */
	int funcs_used;		/* Total number of functions used */

	/*
	 * Call count for each function. This is indexed by the word offset
	 * of the function from gd->relocaddr
	 */
	uintptr_t *call_accum;

	/* Function trace list */
	struct trace_call *ftrace;	/* The function call records */
	ulong ftrace_size;	/* Num. of ftrace records we have space for */
	ulong ftrace_count;	/* Num. of ftrace records written */
	ulong ftrace_too_deep_count;	/* Functions that were too deep */

	int depth;
	int depth_limit;
	int max_depth;
};

static struct trace_hdr *hdr;	/* Pointer to start of trace buffer */

static inline uintptr_t __attribute__((no_instrument_function))
		func_ptr_to_num(void *func_ptr)
{
	uintptr_t offset = (uintptr_t)func_ptr;

#ifdef CONFIG_SANDBOX
	offset -= (uintptr_t)&_init;
#else
	if (gd->flags & GD_FLG_RELOC)
		offset -= gd->relocaddr;
	else
		offset -= CONFIG_TEXT_BASE;
#endif
	return offset / FUNC_SITE_SIZE;
}

#if defined(CONFIG_EFI_LOADER) && (defined(CONFIG_ARM) || defined(CONFIG_RISCV))

/**
 * trace_gd - the value of the gd register
 */
static volatile gd_t *trace_gd;

/**
 * trace_save_gd() - save the value of the gd register
 */
static void __attribute__((no_instrument_function)) trace_save_gd(void)
{
	trace_gd = gd;
}

/**
 * trace_swap_gd() - swap between U-Boot and application gd register value
 *
 * An UEFI application may change the value of the register that gd lives in.
 * But some of our functions like get_ticks() access this register. So we
 * have to set the gd register to the U-Boot value when entering a trace
 * point and set it back to the application value when exiting the trace point.
 */
static void __attribute__((no_instrument_function)) trace_swap_gd(void)
{
	volatile gd_t *temp_gd = trace_gd;

	trace_gd = gd;
	set_gd(temp_gd);
}

#else

static void __attribute__((no_instrument_function)) trace_save_gd(void)
{
}

static void __attribute__((no_instrument_function)) trace_swap_gd(void)
{
}

#endif

static void __attribute__((no_instrument_function)) add_ftrace(void *func_ptr,
				void *caller, ulong flags)
{
	if (hdr->depth > hdr->depth_limit) {
		hdr->ftrace_too_deep_count++;
		return;
	}
	if (hdr->ftrace_count < hdr->ftrace_size) {
		struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];

		rec->func = func_ptr_to_num(func_ptr);
		rec->caller = func_ptr_to_num(caller);
		rec->flags = flags | (timer_get_us() & FUNCF_TIMESTAMP_MASK);
	}
	hdr->ftrace_count++;
}

static void __attribute__((no_instrument_function)) add_textbase(void)
{
	if (hdr->ftrace_count < hdr->ftrace_size) {
		struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];

		rec->func = CONFIG_TEXT_BASE;
		rec->caller = 0;
		rec->flags = FUNCF_TEXTBASE;
	}
	hdr->ftrace_count++;
}

/**
 * __cyg_profile_func_enter() - record function entry
 *
 * We add to our tally for this function and add to the list of called
 * functions.
 *
 * @func_ptr:	pointer to function being entered
 * @caller:	pointer to function which called this function
 */
void __attribute__((no_instrument_function)) __cyg_profile_func_enter(
		void *func_ptr, void *caller)
{
	if (trace_enabled) {
		int func;

		trace_swap_gd();
		add_ftrace(func_ptr, caller, FUNCF_ENTRY);
		func = func_ptr_to_num(func_ptr);
		if (func < hdr->func_count) {
			hdr->call_accum[func]++;
			hdr->call_count++;
		} else {
			hdr->untracked_count++;
		}
		hdr->depth++;
		if (hdr->depth > hdr->depth_limit)
			hdr->max_depth = hdr->depth;
		trace_swap_gd();
	}
}

/**
 * __cyg_profile_func_exit() - record function exit
 *
 * @func_ptr:	pointer to function being entered
 * @caller:	pointer to function which called this function
 */
void __attribute__((no_instrument_function)) __cyg_profile_func_exit(
		void *func_ptr, void *caller)
{
	if (trace_enabled) {
		trace_swap_gd();
		add_ftrace(func_ptr, caller, FUNCF_EXIT);
		hdr->depth--;
		trace_swap_gd();
	}
}

/**
 * trace_list_functions() - produce a list of called functions
 *
 * The information is written into the supplied buffer - a header followed
 * by a list of function records.
 *
 * @buff:	buffer to place list into
 * @buff_size:	size of buffer
 * @needed:	returns size of buffer needed, which may be
 *		greater than buff_size if we ran out of space.
 * Return:	0 if ok, -ENOSPC if space was exhausted
 */
int trace_list_functions(void *buff, size_t buff_size, size_t *needed)
{
	struct trace_output_hdr *output_hdr = NULL;
	void *end, *ptr = buff;
	size_t func;
	size_t upto;

	end = buff ? buff + buff_size : NULL;

	/* Place some header information */
	if (ptr + sizeof(struct trace_output_hdr) < end)
		output_hdr = ptr;
	ptr += sizeof(struct trace_output_hdr);

	/* Add information about each function */
	for (func = upto = 0; func < hdr->func_count; func++) {
		size_t calls = hdr->call_accum[func];

		if (!calls)
			continue;

		if (ptr + sizeof(struct trace_output_func) < end) {
			struct trace_output_func *stats = ptr;

			stats->offset = func * FUNC_SITE_SIZE;
			stats->call_count = calls;
			upto++;
		}
		ptr += sizeof(struct trace_output_func);
	}

	/* Update the header */
	if (output_hdr) {
		output_hdr->rec_count = upto;
		output_hdr->type = TRACE_CHUNK_FUNCS;
	}

	/* Work out how must of the buffer we used */
	*needed = ptr - buff;
	if (ptr > end)
		return -ENOSPC;

	return 0;
}

/**
 * trace_list_functions() - produce a list of function calls
 *
 * The information is written into the supplied buffer - a header followed
 * by a list of function records.
 *
 * @buff:	buffer to place list into
 * @buff_size:	size of buffer
 * @needed:	returns size of buffer needed, which may be
 *		greater than buff_size if we ran out of space.
 * Return:	0 if ok, -ENOSPC if space was exhausted
 */
int trace_list_calls(void *buff, size_t buff_size, size_t *needed)
{
	struct trace_output_hdr *output_hdr = NULL;
	void *end, *ptr = buff;
	size_t rec, upto;
	size_t count;

	end = buff ? buff + buff_size : NULL;

	/* Place some header information */
	if (ptr + sizeof(struct trace_output_hdr) < end)
		output_hdr = ptr;
	ptr += sizeof(struct trace_output_hdr);

	/* Add information about each call */
	count = hdr->ftrace_count;
	if (count > hdr->ftrace_size)
		count = hdr->ftrace_size;
	for (rec = upto = 0; rec < count; rec++) {
		if (ptr + sizeof(struct trace_call) < end) {
			struct trace_call *call = &hdr->ftrace[rec];
			struct trace_call *out = ptr;

			out->func = call->func * FUNC_SITE_SIZE;
			out->caller = call->caller * FUNC_SITE_SIZE;
			out->flags = call->flags;
			upto++;
		}
		ptr += sizeof(struct trace_call);
	}

	/* Update the header */
	if (output_hdr) {
		output_hdr->rec_count = upto;
		output_hdr->type = TRACE_CHUNK_CALLS;
	}

	/* Work out how must of the buffer we used */
	*needed = ptr - buff;
	if (ptr > end)
		return -ENOSPC;

	return 0;
}

/**
 * trace_print_stats() - print basic information about tracing
 */
void trace_print_stats(void)
{
	ulong count;

#ifndef FTRACE
	puts("Warning: make U-Boot with FTRACE to enable function instrumenting.\n");
	puts("You will likely get zeroed data here\n");
#endif
	if (!trace_inited) {
		printf("Trace is disabled\n");
		return;
	}
	print_grouped_ull(hdr->func_count, 10);
	puts(" function sites\n");
	print_grouped_ull(hdr->call_count, 10);
	puts(" function calls\n");
	print_grouped_ull(hdr->untracked_count, 10);
	puts(" untracked function calls\n");
	count = min(hdr->ftrace_count, hdr->ftrace_size);
	print_grouped_ull(count, 10);
	puts(" traced function calls");
	if (hdr->ftrace_count > hdr->ftrace_size) {
		printf(" (%lu dropped due to overflow)",
		       hdr->ftrace_count - hdr->ftrace_size);
	}
	puts("\n");
	printf("%15d maximum observed call depth\n", hdr->max_depth);
	printf("%15d call depth limit\n", hdr->depth_limit);
	print_grouped_ull(hdr->ftrace_too_deep_count, 10);
	puts(" calls not traced due to depth\n");
}

void __attribute__((no_instrument_function)) trace_set_enabled(int enabled)
{
	trace_enabled = enabled != 0;
}

/**
 * trace_init() - initialize the tracing system and enable it
 *
 * @buff:	Pointer to trace buffer
 * @buff_size:	Size of trace buffer
 * Return:	0 if ok
 */
int __attribute__((no_instrument_function)) trace_init(void *buff,
		size_t buff_size)
{
	ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
	size_t needed;
	int was_disabled = !trace_enabled;

	trace_save_gd();

	if (!was_disabled) {
#ifdef CONFIG_TRACE_EARLY
		char *end;
		ulong used;

		/*
		 * Copy over the early trace data if we have it. Disable
		 * tracing while we are doing this.
		 */
		trace_enabled = 0;
		hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR,
				 CONFIG_TRACE_EARLY_SIZE);
		end = (char *)&hdr->ftrace[min(hdr->ftrace_count,
					       hdr->ftrace_size)];
		used = end - (char *)hdr;
		printf("trace: copying %08lx bytes of early data from %x to %08lx\n",
		       used, CONFIG_TRACE_EARLY_ADDR,
		       (ulong)map_to_sysmem(buff));
		memcpy(buff, hdr, used);
#else
		puts("trace: already enabled\n");
		return -EALREADY;
#endif
	}
	hdr = (struct trace_hdr *)buff;
	needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
	if (needed > buff_size) {
		printf("trace: buffer size %zd bytes: at least %zd needed\n",
		       buff_size, needed);
		return -ENOSPC;
	}

	if (was_disabled)
		memset(hdr, '\0', needed);
	hdr->func_count = func_count;
	hdr->call_accum = (uintptr_t *)(hdr + 1);

	/* Use any remaining space for the timed function trace */
	hdr->ftrace = (struct trace_call *)(buff + needed);
	hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
	add_textbase();

	puts("trace: enabled\n");
	hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
	trace_enabled = 1;
	trace_inited = 1;

	return 0;
}

#ifdef CONFIG_TRACE_EARLY
/**
 * trace_early_init() - initialize the tracing system for early tracing
 *
 * Return:	0 if ok, -ENOSPC if not enough memory is available
 */
int __attribute__((no_instrument_function)) trace_early_init(void)
{
	ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
	size_t buff_size = CONFIG_TRACE_EARLY_SIZE;
	size_t needed;

	/* We can ignore additional calls to this function */
	if (trace_enabled)
		return 0;

	hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR, CONFIG_TRACE_EARLY_SIZE);
	needed = sizeof(*hdr) + func_count * sizeof(uintptr_t);
	if (needed > buff_size) {
		printf("trace: buffer size is %zd bytes, at least %zd needed\n",
		       buff_size, needed);
		return -ENOSPC;
	}

	memset(hdr, '\0', needed);
	hdr->call_accum = (uintptr_t *)(hdr + 1);
	hdr->func_count = func_count;

	/* Use any remaining space for the timed function trace */
	hdr->ftrace = (struct trace_call *)((char *)hdr + needed);
	hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
	add_textbase();
	hdr->depth_limit = CONFIG_TRACE_EARLY_CALL_DEPTH_LIMIT;
	printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR);

	trace_enabled = 1;

	return 0;
}
#endif
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
b2e16a85 SG	2	/*
b2e16a85 SG	3	* Copyright (c) 2012 The Chromium OS Authors.
b2e16a85 SG	4	*/
	5
	6	#include <common.h>
0eb25b61	7	#include <mapmem.h>
1045315d	8	#include <time.h>
b2e16a85	9	#include <trace.h>
401d1c4f	10	#include <asm/global_data.h>
b2e16a85 SG	11	#include <asm/io.h>
	12	#include <asm/sections.h>
	13
	14	DECLARE_GLOBAL_DATA_PTR;
	15
236f2ec4 MB	16	static char trace_enabled __section(".data");
236f2ec4 MB	17	static char trace_inited __section(".data");
b2e16a85 SG	18
	19	/* The header block at the start of the trace memory area */
	20	struct trace_hdr {
	21	int func_count; /* Total number of function call sites */
	22	u64 call_count; /* Total number of tracked function calls */
	23	u64 untracked_count; /* Total number of untracked function calls */
	24	int funcs_used; /* Total number of functions used */
	25
	26	/*
	27	* Call count for each function. This is indexed by the word offset
	28	* of the function from gd->relocaddr
	29	*/
	30	uintptr_t *call_accum;
	31
	32	/* Function trace list */
	33	struct trace_call ftrace; / The function call records */
	34	ulong ftrace_size; /* Num. of ftrace records we have space for */
	35	ulong ftrace_count; /* Num. of ftrace records written */
	36	ulong ftrace_too_deep_count; /* Functions that were too deep */
	37
	38	int depth;
	39	int depth_limit;
	40	int max_depth;
	41	};
	42
	43	static struct trace_hdr hdr; / Pointer to start of trace buffer */
	44
	45	static inline uintptr_t __attribute__((no_instrument_function))
	46	func_ptr_to_num(void *func_ptr)
	47	{
	48	uintptr_t offset = (uintptr_t)func_ptr;
	49
	50	#ifdef CONFIG_SANDBOX
	51	offset -= (uintptr_t)&_init;
	52	#else
	53	if (gd->flags & GD_FLG_RELOC)
	54	offset -= gd->relocaddr;
	55	else
98463903	56	offset -= CONFIG_TEXT_BASE;
b2e16a85 SG	57	#endif
	58	return offset / FUNC_SITE_SIZE;
	59	}
	60
d3d6afae	61	#if defined(CONFIG_EFI_LOADER) && (defined(CONFIG_ARM) \|\| defined(CONFIG_RISCV))
a2fa38da HS	62
	63	/**
	64	* trace_gd - the value of the gd register
	65	*/
7f642cb2	66	static volatile gd_t *trace_gd;
a2fa38da HS	67
	68	/**
	69	* trace_save_gd() - save the value of the gd register
	70	*/
	71	static void __attribute__((no_instrument_function)) trace_save_gd(void)
	72	{
	73	trace_gd = gd;
	74	}
	75
	76	/**
	77	* trace_swap_gd() - swap between U-Boot and application gd register value
	78	*
	79	* An UEFI application may change the value of the register that gd lives in.
	80	* But some of our functions like get_ticks() access this register. So we
	81	* have to set the gd register to the U-Boot value when entering a trace
	82	* point and set it back to the application value when exiting the trace point.
	83	*/
	84	static void __attribute__((no_instrument_function)) trace_swap_gd(void)
	85	{
7f642cb2	86	volatile gd_t *temp_gd = trace_gd;
a2fa38da HS	87
a2fa38da HS	88	trace_gd = gd;
7f642cb2	89	set_gd(temp_gd);
a2fa38da HS	90	}
	91
	92	#else
	93
	94	static void __attribute__((no_instrument_function)) trace_save_gd(void)
	95	{
	96	}
	97
	98	static void __attribute__((no_instrument_function)) trace_swap_gd(void)
	99	{
	100	}
	101
	102	#endif
	103
b2e16a85 SG	104	static void __attribute__((no_instrument_function)) add_ftrace(void *func_ptr,
	105	void *caller, ulong flags)
	106	{
	107	if (hdr->depth > hdr->depth_limit) {
	108	hdr->ftrace_too_deep_count++;
	109	return;
	110	}
	111	if (hdr->ftrace_count < hdr->ftrace_size) {
	112	struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];
	113
	114	rec->func = func_ptr_to_num(func_ptr);
	115	rec->caller = func_ptr_to_num(caller);
	116	rec->flags = flags \| (timer_get_us() & FUNCF_TIMESTAMP_MASK);
	117	}
	118	hdr->ftrace_count++;
	119	}
	120
	121	static void __attribute__((no_instrument_function)) add_textbase(void)
	122	{
	123	if (hdr->ftrace_count < hdr->ftrace_size) {
	124	struct trace_call *rec = &hdr->ftrace[hdr->ftrace_count];
	125
98463903	126	rec->func = CONFIG_TEXT_BASE;
b2e16a85 SG	127	rec->caller = 0;
	128	rec->flags = FUNCF_TEXTBASE;
	129	}
	130	hdr->ftrace_count++;
	131	}
	132
	133	/**
e605ab84	134	* __cyg_profile_func_enter() - record function entry
b2e16a85 SG	135	*
	136	* We add to our tally for this function and add to the list of called
	137	* functions.
	138	*
e605ab84 HS	139	* @func_ptr: pointer to function being entered
e605ab84 HS	140	* @caller: pointer to function which called this function
b2e16a85 SG	141	*/
	142	void __attribute__((no_instrument_function)) __cyg_profile_func_enter(
	143	void func_ptr, void caller)
	144	{
	145	if (trace_enabled) {
	146	int func;
	147
a2fa38da	148	trace_swap_gd();
b2e16a85 SG	149	add_ftrace(func_ptr, caller, FUNCF_ENTRY);
	150	func = func_ptr_to_num(func_ptr);
	151	if (func < hdr->func_count) {
	152	hdr->call_accum[func]++;
	153	hdr->call_count++;
	154	} else {
	155	hdr->untracked_count++;
	156	}
	157	hdr->depth++;
	158	if (hdr->depth > hdr->depth_limit)
	159	hdr->max_depth = hdr->depth;
a2fa38da	160	trace_swap_gd();
b2e16a85 SG	161	}
	162	}
	163
	164	/**
e605ab84	165	* __cyg_profile_func_exit() - record function exit
b2e16a85	166	*
e605ab84 HS	167	* @func_ptr: pointer to function being entered
e605ab84 HS	168	* @caller: pointer to function which called this function
b2e16a85 SG	169	*/
	170	void __attribute__((no_instrument_function)) __cyg_profile_func_exit(
	171	void func_ptr, void caller)
	172	{
	173	if (trace_enabled) {
a2fa38da	174	trace_swap_gd();
b2e16a85 SG	175	add_ftrace(func_ptr, caller, FUNCF_EXIT);
b2e16a85 SG	176	hdr->depth--;
a2fa38da	177	trace_swap_gd();
b2e16a85 SG	178	}
	179	}
	180
	181	/**
e605ab84	182	* trace_list_functions() - produce a list of called functions
b2e16a85 SG	183	*
	184	* The information is written into the supplied buffer - a header followed
	185	* by a list of function records.
	186	*
e605ab84 HS	187	* @buff: buffer to place list into
	188	* @buff_size: size of buffer
	189	* @needed: returns size of buffer needed, which may be
	190	* greater than buff_size if we ran out of space.
	191	* Return: 0 if ok, -ENOSPC if space was exhausted
b2e16a85	192	*/
2b7a3882	193	int trace_list_functions(void buff, size_t buff_size, size_t needed)
b2e16a85 SG	194	{
	195	struct trace_output_hdr *output_hdr = NULL;
	196	void end, ptr = buff;
2b7a3882 HS	197	size_t func;
2b7a3882 HS	198	size_t upto;
b2e16a85 SG	199
	200	end = buff ? buff + buff_size : NULL;
	201
	202	/* Place some header information */
	203	if (ptr + sizeof(struct trace_output_hdr) < end)
	204	output_hdr = ptr;
	205	ptr += sizeof(struct trace_output_hdr);
	206
	207	/* Add information about each function */
	208	for (func = upto = 0; func < hdr->func_count; func++) {
2b7a3882	209	size_t calls = hdr->call_accum[func];
b2e16a85 SG	210
	211	if (!calls)
	212	continue;
	213
	214	if (ptr + sizeof(struct trace_output_func) < end) {
	215	struct trace_output_func *stats = ptr;
	216
	217	stats->offset = func * FUNC_SITE_SIZE;
	218	stats->call_count = calls;
	219	upto++;
	220	}
	221	ptr += sizeof(struct trace_output_func);
	222	}
	223
	224	/* Update the header */
	225	if (output_hdr) {
	226	output_hdr->rec_count = upto;
	227	output_hdr->type = TRACE_CHUNK_FUNCS;
	228	}
	229
	230	/* Work out how must of the buffer we used */
	231	*needed = ptr - buff;
	232	if (ptr > end)
f564d096 SG	233	return -ENOSPC;
f564d096 SG	234
b2e16a85 SG	235	return 0;
	236	}
	237
e605ab84 HS	238	/**
	239	* trace_list_functions() - produce a list of function calls
	240	*
	241	* The information is written into the supplied buffer - a header followed
	242	* by a list of function records.
	243	*
	244	* @buff: buffer to place list into
	245	* @buff_size: size of buffer
	246	* @needed: returns size of buffer needed, which may be
	247	* greater than buff_size if we ran out of space.
	248	* Return: 0 if ok, -ENOSPC if space was exhausted
	249	*/
2b7a3882	250	int trace_list_calls(void buff, size_t buff_size, size_t needed)
b2e16a85 SG	251	{
	252	struct trace_output_hdr *output_hdr = NULL;
	253	void end, ptr = buff;
2b7a3882 HS	254	size_t rec, upto;
2b7a3882 HS	255	size_t count;
b2e16a85 SG	256
	257	end = buff ? buff + buff_size : NULL;
	258
	259	/* Place some header information */
	260	if (ptr + sizeof(struct trace_output_hdr) < end)
	261	output_hdr = ptr;
	262	ptr += sizeof(struct trace_output_hdr);
	263
	264	/* Add information about each call */
	265	count = hdr->ftrace_count;
	266	if (count > hdr->ftrace_size)
	267	count = hdr->ftrace_size;
	268	for (rec = upto = 0; rec < count; rec++) {
	269	if (ptr + sizeof(struct trace_call) < end) {
	270	struct trace_call *call = &hdr->ftrace[rec];
	271	struct trace_call *out = ptr;
	272
	273	out->func = call->func * FUNC_SITE_SIZE;
	274	out->caller = call->caller * FUNC_SITE_SIZE;
	275	out->flags = call->flags;
	276	upto++;
	277	}
	278	ptr += sizeof(struct trace_call);
	279	}
	280
	281	/* Update the header */
	282	if (output_hdr) {
	283	output_hdr->rec_count = upto;
	284	output_hdr->type = TRACE_CHUNK_CALLS;
	285	}
	286
	287	/* Work out how must of the buffer we used */
	288	*needed = ptr - buff;
	289	if (ptr > end)
f564d096 SG	290	return -ENOSPC;
f564d096 SG	291
b2e16a85 SG	292	return 0;
	293	}
	294
e605ab84 HS	295	/**
	296	* trace_print_stats() - print basic information about tracing
	297	*/
b2e16a85 SG	298	void trace_print_stats(void)
	299	{
	300	ulong count;
	301
	302	#ifndef FTRACE
	303	puts("Warning: make U-Boot with FTRACE to enable function instrumenting.\n");
	304	puts("You will likely get zeroed data here\n");
	305	#endif
	306	if (!trace_inited) {
	307	printf("Trace is disabled\n");
	308	return;
	309	}
	310	print_grouped_ull(hdr->func_count, 10);
	311	puts(" function sites\n");
	312	print_grouped_ull(hdr->call_count, 10);
	313	puts(" function calls\n");
	314	print_grouped_ull(hdr->untracked_count, 10);
	315	puts(" untracked function calls\n");
	316	count = min(hdr->ftrace_count, hdr->ftrace_size);
	317	print_grouped_ull(count, 10);
	318	puts(" traced function calls");
	319	if (hdr->ftrace_count > hdr->ftrace_size) {
	320	printf(" (%lu dropped due to overflow)",
	321	hdr->ftrace_count - hdr->ftrace_size);
	322	}
	323	puts("\n");
	324	printf("%15d maximum observed call depth\n", hdr->max_depth);
	325	printf("%15d call depth limit\n", hdr->depth_limit);
	326	print_grouped_ull(hdr->ftrace_too_deep_count, 10);
	327	puts(" calls not traced due to depth\n");
	328	}
	329
	330	void __attribute__((no_instrument_function)) trace_set_enabled(int enabled)
	331	{
	332	trace_enabled = enabled != 0;
	333	}
	334
	335	/**
e605ab84	336	* trace_init() - initialize the tracing system and enable it
b2e16a85	337	*
e605ab84 HS	338	* @buff: Pointer to trace buffer
	339	* @buff_size: Size of trace buffer
	340	* Return: 0 if ok
b2e16a85 SG	341	*/
	342	int __attribute__((no_instrument_function)) trace_init(void *buff,
	343	size_t buff_size)
	344	{
	345	ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
	346	size_t needed;
	347	int was_disabled = !trace_enabled;
	348
a2fa38da HS	349	trace_save_gd();
a2fa38da HS	350
b2e16a85 SG	351	if (!was_disabled) {
	352	#ifdef CONFIG_TRACE_EARLY
	353	char *end;
	354	ulong used;
	355
	356	/*
	357	* Copy over the early trace data if we have it. Disable
	358	* tracing while we are doing this.
	359	*/
	360	trace_enabled = 0;
	361	hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR,
	362	CONFIG_TRACE_EARLY_SIZE);
1c6eb075 SG	363	end = (char *)&hdr->ftrace[min(hdr->ftrace_count,
1c6eb075 SG	364	hdr->ftrace_size)];
b2e16a85 SG	365	used = end - (char *)hdr;
	366	printf("trace: copying %08lx bytes of early data from %x to %08lx\n",
	367	used, CONFIG_TRACE_EARLY_ADDR,
	368	(ulong)map_to_sysmem(buff));
	369	memcpy(buff, hdr, used);
	370	#else
	371	puts("trace: already enabled\n");
f564d096	372	return -EALREADY;
b2e16a85 SG	373	#endif
	374	}
	375	hdr = (struct trace_hdr *)buff;
	376	needed = sizeof(hdr) + func_count sizeof(uintptr_t);
	377	if (needed > buff_size) {
	378	printf("trace: buffer size %zd bytes: at least %zd needed\n",
	379	buff_size, needed);
f564d096	380	return -ENOSPC;
b2e16a85 SG	381	}
	382
	383	if (was_disabled)
	384	memset(hdr, '\0', needed);
	385	hdr->func_count = func_count;
	386	hdr->call_accum = (uintptr_t *)(hdr + 1);
	387
	388	/* Use any remaining space for the timed function trace */
	389	hdr->ftrace = (struct trace_call *)(buff + needed);
	390	hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
	391	add_textbase();
	392
	393	puts("trace: enabled\n");
da0fb5fd	394	hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
b2e16a85 SG	395	trace_enabled = 1;
b2e16a85 SG	396	trace_inited = 1;
f564d096	397
b2e16a85 SG	398	return 0;
	399	}
	400
	401	#ifdef CONFIG_TRACE_EARLY
e605ab84 HS	402	/**
	403	* trace_early_init() - initialize the tracing system for early tracing
	404	*
	405	* Return: 0 if ok, -ENOSPC if not enough memory is available
	406	*/
b2e16a85 SG	407	int __attribute__((no_instrument_function)) trace_early_init(void)
	408	{
	409	ulong func_count = gd->mon_len / FUNC_SITE_SIZE;
	410	size_t buff_size = CONFIG_TRACE_EARLY_SIZE;
	411	size_t needed;
	412
	413	/* We can ignore additional calls to this function */
	414	if (trace_enabled)
	415	return 0;
	416
	417	hdr = map_sysmem(CONFIG_TRACE_EARLY_ADDR, CONFIG_TRACE_EARLY_SIZE);
	418	needed = sizeof(hdr) + func_count sizeof(uintptr_t);
	419	if (needed > buff_size) {
	420	printf("trace: buffer size is %zd bytes, at least %zd needed\n",
	421	buff_size, needed);
f564d096	422	return -ENOSPC;
b2e16a85 SG	423	}
	424
	425	memset(hdr, '\0', needed);
	426	hdr->call_accum = (uintptr_t *)(hdr + 1);
	427	hdr->func_count = func_count;
	428
	429	/* Use any remaining space for the timed function trace */
	430	hdr->ftrace = (struct trace_call )((char )hdr + needed);
	431	hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
	432	add_textbase();
da0fb5fd	433	hdr->depth_limit = CONFIG_TRACE_EARLY_CALL_DEPTH_LIMIT;
b2e16a85 SG	434	printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR);
	435
	436	trace_enabled = 1;
f564d096	437
b2e16a85 SG	438	return 0;
	439	}
	440	#endif