[J-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/io.h>
#include <asm/sections.h>

DECLARE_GLOBAL_DATA_PTR;

static char trace_enabled __attribute__((section(".data")));
static char trace_inited __attribute__((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_SYS_TEXT_BASE;
#endif
	return offset / FUNC_SITE_SIZE;
}

#ifdef CONFIG_EFI_LOADER

/**
 * trace_gd - the value of the gd register
 */
static volatile void *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 void *temp_gd = trace_gd;

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