tools/perf/tests/sample-parsing.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include <stdbool.h>
 #include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
 #include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/types.h>

 #include "map_symbol.h"
 #include "branch.h"
 #include "event.h"
 #include "evsel.h"
 #include "debug.h"
 #include "util/synthetic-events.h"
 #include "util/util.h"

 #include "tests.h"

 #define COMP(m) do {					\
 	if (s1->m != s2->m) {				\
 		pr_debug("Samples differ at '"#m"'\n");	\
 		return false;				\
 	}						\
 } while (0)

 #define MCOMP(m) do {					\
 	if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) {	\
 		pr_debug("Samples differ at '"#m"'\n");	\
 		return false;				\
 	}						\
 } while (0)

 /*
  * Hardcode the expected values for branch_entry flags.
  * These are based on the input value (213) specified
  * in branch_stack variable.
  */
 #define BS_EXPECTED_BE	0xa000d00000000000
 #define BS_EXPECTED_LE	0x1aa00000000
 #define FLAG(s)	s->branch_stack->entries[i].flags

 static bool samples_same(const struct perf_sample *s1,
 			 const struct perf_sample *s2,
 			 u64 type, u64 read_format, bool needs_swap)
 {
 	size_t i;

 	if (type & PERF_SAMPLE_IDENTIFIER)
 		COMP(id);

 	if (type & PERF_SAMPLE_IP)
 		COMP(ip);

 	if (type & PERF_SAMPLE_TID) {
 		COMP(pid);
 		COMP(tid);
 	}

 	if (type & PERF_SAMPLE_TIME)
 		COMP(time);

 	if (type & PERF_SAMPLE_ADDR)
 		COMP(addr);

 	if (type & PERF_SAMPLE_ID)
 		COMP(id);

 	if (type & PERF_SAMPLE_STREAM_ID)
 		COMP(stream_id);

 	if (type & PERF_SAMPLE_CPU)
 		COMP(cpu);

 	if (type & PERF_SAMPLE_PERIOD)
 		COMP(period);

 	if (type & PERF_SAMPLE_READ) {
 		if (read_format & PERF_FORMAT_GROUP)
 			COMP(read.group.nr);
 		else
 			COMP(read.one.value);
 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
 			COMP(read.time_enabled);
 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
 			COMP(read.time_running);
 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
 		if (read_format & PERF_FORMAT_GROUP) {
 			for (i = 0; i < s1->read.group.nr; i++) {
 				/* FIXME: check values without LOST */
 				if (read_format & PERF_FORMAT_LOST)
 					MCOMP(read.group.values[i]);
 			}
 		} else {
 			COMP(read.one.id);
 			if (read_format & PERF_FORMAT_LOST)
 				COMP(read.one.lost);
 		}
 	}

 	if (type & PERF_SAMPLE_CALLCHAIN) {
 		COMP(callchain->nr);
 		for (i = 0; i < s1->callchain->nr; i++)
 			COMP(callchain->ips[i]);
 	}

 	if (type & PERF_SAMPLE_RAW) {
 		COMP(raw_size);
 		if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
 			pr_debug("Samples differ at 'raw_data'\n");
 			return false;
 		}
 	}

 	if (type & PERF_SAMPLE_BRANCH_STACK) {
 		COMP(branch_stack->nr);
 		COMP(branch_stack->hw_idx);
 		for (i = 0; i < s1->branch_stack->nr; i++) {
 			if (needs_swap)
 				return ((host_is_bigendian()) ?
 					(FLAG(s2).value == BS_EXPECTED_BE) :
 					(FLAG(s2).value == BS_EXPECTED_LE));
 			else
 				MCOMP(branch_stack->entries[i]);
 		}
 	}

 	if (type & PERF_SAMPLE_REGS_USER) {
 		size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64);

 		COMP(user_regs.mask);
 		COMP(user_regs.abi);
 		if (s1->user_regs.abi &&
 		    (!s1->user_regs.regs || !s2->user_regs.regs ||
 		     memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
 			pr_debug("Samples differ at 'user_regs'\n");
 			return false;
 		}
 	}

 	if (type & PERF_SAMPLE_STACK_USER) {
 		COMP(user_stack.size);
 		if (memcmp(s1->user_stack.data, s2->user_stack.data,
 			   s1->user_stack.size)) {
 			pr_debug("Samples differ at 'user_stack'\n");
 			return false;
 		}
 	}

 	if (type & PERF_SAMPLE_WEIGHT)
 		COMP(weight);

 	if (type & PERF_SAMPLE_DATA_SRC)
 		COMP(data_src);

 	if (type & PERF_SAMPLE_TRANSACTION)
 		COMP(transaction);

 	if (type & PERF_SAMPLE_REGS_INTR) {
 		size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64);

 		COMP(intr_regs.mask);
 		COMP(intr_regs.abi);
 		if (s1->intr_regs.abi &&
 		    (!s1->intr_regs.regs || !s2->intr_regs.regs ||
 		     memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) {
 			pr_debug("Samples differ at 'intr_regs'\n");
 			return false;
 		}
 	}

 	if (type & PERF_SAMPLE_PHYS_ADDR)
 		COMP(phys_addr);

 	if (type & PERF_SAMPLE_CGROUP)
 		COMP(cgroup);

 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
 		COMP(data_page_size);

 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
 		COMP(code_page_size);

 	if (type & PERF_SAMPLE_AUX) {
 		COMP(aux_sample.size);
 		if (memcmp(s1->aux_sample.data, s2->aux_sample.data,
 			   s1->aux_sample.size)) {
 			pr_debug("Samples differ at 'aux_sample'\n");
 			return false;
 		}
 	}

 	return true;
 }

 static int do_test(u64 sample_type, u64 sample_regs, u64 read_format)
 {
 	struct evsel evsel = {
 		.needs_swap = false,
 		.core = {
 			. attr = {
 				.sample_type = sample_type,
 				.read_format = read_format,
 			},
 		},
 	};
 	union perf_event *event;
 	union {
 		struct ip_callchain callchain;
 		u64 data[64];
 	} callchain = {
 		/* 3 ips */
 		.data = {3, 201, 202, 203},
 	};
 	union {
 		struct branch_stack branch_stack;
 		u64 data[64];
 	} branch_stack = {
 		/* 1 branch_entry */
 		.data = {1, -1ULL, 211, 212, 213},
 	};
 	u64 regs[64];
 	const u32 raw_data[] = {0x12345678, 0x0a0b0c0d, 0x11020304, 0x05060708, 0 };
 	const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
 	const u64 aux_data[] = {0xa55a, 0, 0xeeddee, 0x0282028202820282};
 	struct perf_sample sample = {
 		.ip		= 101,
 		.pid		= 102,
 		.tid		= 103,
 		.time		= 104,
 		.addr		= 105,
 		.id		= 106,
 		.stream_id	= 107,
 		.period		= 108,
 		.weight		= 109,
 		.cpu		= 110,
 		.raw_size	= sizeof(raw_data),
 		.data_src	= 111,
 		.transaction	= 112,
 		.raw_data	= (void *)raw_data,
 		.callchain	= &callchain.callchain,
 		.no_hw_idx      = false,
 		.branch_stack	= &branch_stack.branch_stack,
 		.user_regs	= {
 			.abi	= PERF_SAMPLE_REGS_ABI_64,
 			.mask	= sample_regs,
 			.regs	= regs,
 		},
 		.user_stack	= {
 			.size	= sizeof(data),
 			.data	= (void *)data,
 		},
 		.read		= {
 			.time_enabled = 0x030a59d664fca7deULL,
 			.time_running = 0x011b6ae553eb98edULL,
 		},
 		.intr_regs	= {
 			.abi	= PERF_SAMPLE_REGS_ABI_64,
 			.mask	= sample_regs,
 			.regs	= regs,
 		},
 		.phys_addr	= 113,
 		.cgroup		= 114,
 		.data_page_size = 115,
 		.code_page_size = 116,
 		.aux_sample	= {
 			.size	= sizeof(aux_data),
 			.data	= (void *)aux_data,
 		},
 	};
 	struct sample_read_value values[] = {{1, 5, 0}, {9, 3, 0}, {2, 7, 0}, {6, 4, 1},};
 	struct perf_sample sample_out, sample_out_endian;
 	size_t i, sz, bufsz;
 	int err, ret = -1;

 	if (sample_type & PERF_SAMPLE_REGS_USER)
 		evsel.core.attr.sample_regs_user = sample_regs;

 	if (sample_type & PERF_SAMPLE_REGS_INTR)
 		evsel.core.attr.sample_regs_intr = sample_regs;

 	if (sample_type & PERF_SAMPLE_BRANCH_STACK)
 		evsel.core.attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX;

 	for (i = 0; i < sizeof(regs); i++)
 		*(i + (u8 *)regs) = i & 0xfe;

 	if (read_format & PERF_FORMAT_GROUP) {
 		sample.read.group.nr     = 4;
 		sample.read.group.values = values;
 	} else {
 		sample.read.one.value = 0x08789faeb786aa87ULL;
 		sample.read.one.id    = 99;
 		sample.read.one.lost  = 1;
 	}

 	sz = perf_event__sample_event_size(&sample, sample_type, read_format);
 	bufsz = sz + 4096; /* Add a bit for overrun checking */
 	event = malloc(bufsz);
 	if (!event) {
 		pr_debug("malloc failed\n");
 		return -1;
 	}

 	memset(event, 0xff, bufsz);
 	event->header.type = PERF_RECORD_SAMPLE;
 	event->header.misc = 0;
 	event->header.size = sz;

 	err = perf_event__synthesize_sample(event, sample_type, read_format,
 					    &sample);
 	if (err) {
 		pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 			 "perf_event__synthesize_sample", sample_type, err);
 		goto out_free;
 	}

 	/* The data does not contain 0xff so we use that to check the size */
 	for (i = bufsz; i > 0; i--) {
 		if (*(i - 1 + (u8 *)event) != 0xff)
 			break;
 	}
 	if (i != sz) {
 		pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
 			 i, sz);
 		goto out_free;
 	}

 	evsel.sample_size = __evsel__sample_size(sample_type);

 	err = evsel__parse_sample(&evsel, event, &sample_out);
 	if (err) {
 		pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 			 "evsel__parse_sample", sample_type, err);
 		goto out_free;
 	}

 	if (!samples_same(&sample, &sample_out, sample_type, read_format, evsel.needs_swap)) {
 		pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 			 sample_type);
 		goto out_free;
 	}

 	if (sample_type == PERF_SAMPLE_BRANCH_STACK) {
 		evsel.needs_swap = true;
 		evsel.sample_size = __evsel__sample_size(sample_type);
 		err = evsel__parse_sample(&evsel, event, &sample_out_endian);
 		if (err) {
 			pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
 				 "evsel__parse_sample", sample_type, err);
 			goto out_free;
 		}

 		if (!samples_same(&sample, &sample_out_endian, sample_type, read_format, evsel.needs_swap)) {
 			pr_debug("parsing failed for sample_type %#"PRIx64"\n",
 				 sample_type);
 			goto out_free;
 		}
 	}

 	ret = 0;
 out_free:
 	free(event);
 	if (ret && read_format)
 		pr_debug("read_format %#"PRIx64"\n", read_format);
 	return ret;
 }

 /**
  * test__sample_parsing - test sample parsing.
  *
  * This function implements a test that synthesizes a sample event, parses it
  * and then checks that the parsed sample matches the original sample.  The test
  * checks sample format bits separately and together.  If the test passes %0 is
  * returned, otherwise %-1 is returned.
  */
 static int test__sample_parsing(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 {
 	const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15, 20, 21, 22, 28, 29, 30, 31};
 	u64 sample_type;
 	u64 sample_regs;
 	size_t i;
 	int err;

 	/*
 	 * Fail the test if it has not been updated when new sample format bits
 	 * were added.  Please actually update the test rather than just change
 	 * the condition below.
 	 */
 	if (PERF_SAMPLE_MAX > PERF_SAMPLE_WEIGHT_STRUCT << 1) {
 		pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
 		return -1;
 	}

 	/* Test each sample format bit separately */
 	for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
 	     sample_type <<= 1) {
 		/* Test read_format variations */
 		if (sample_type == PERF_SAMPLE_READ) {
 			for (i = 0; i < ARRAY_SIZE(rf); i++) {
 				err = do_test(sample_type, 0, rf[i]);
 				if (err)
 					return err;
 			}
 			continue;
 		}
 		sample_regs = 0;

 		if (sample_type == PERF_SAMPLE_REGS_USER)
 			sample_regs = 0x3fff;

 		if (sample_type == PERF_SAMPLE_REGS_INTR)
 			sample_regs = 0xff0fff;

 		err = do_test(sample_type, sample_regs, 0);
 		if (err)
 			return err;
 	}

 	/*
 	 * Test all sample format bits together
 	 * Note: PERF_SAMPLE_WEIGHT and PERF_SAMPLE_WEIGHT_STRUCT cannot
 	 *       be set simultaneously.
 	 */
 	sample_type = (PERF_SAMPLE_MAX - 1) & ~PERF_SAMPLE_WEIGHT;
 	sample_regs = 0x3fff; /* shared yb intr and user regs */
 	for (i = 0; i < ARRAY_SIZE(rf); i++) {
 		err = do_test(sample_type, sample_regs, rf[i]);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 DEFINE_SUITE("Sample parsing", sample_parsing);
	// SPDX-License-Identifier: GPL-2.0
	#include <stdbool.h>
	#include <inttypes.h>
	#include <stdlib.h>
	#include <string.h>
	#include <linux/bitops.h>
	#include <linux/kernel.h>
	#include <linux/types.h>

	#include "map_symbol.h"
	#include "branch.h"
	#include "event.h"
	#include "evsel.h"
	#include "debug.h"
	#include "util/synthetic-events.h"
	#include "util/util.h"

	#include "tests.h"

	#define COMP(m) do { \
	if (s1->m != s2->m) { \
	pr_debug("Samples differ at '"#m"'\n"); \
	return false; \
	} \
	} while (0)

	#define MCOMP(m) do { \
	if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) { \
	pr_debug("Samples differ at '"#m"'\n"); \
	return false; \
	} \
	} while (0)

	/*
	* Hardcode the expected values for branch_entry flags.
	* These are based on the input value (213) specified
	* in branch_stack variable.
	*/
	#define BS_EXPECTED_BE 0xa000d00000000000
	#define BS_EXPECTED_LE 0x1aa00000000
	#define FLAG(s) s->branch_stack->entries[i].flags

	static bool samples_same(const struct perf_sample *s1,
	const struct perf_sample *s2,
	u64 type, u64 read_format, bool needs_swap)
	{
	size_t i;

	if (type & PERF_SAMPLE_IDENTIFIER)
	COMP(id);

	if (type & PERF_SAMPLE_IP)
	COMP(ip);

	if (type & PERF_SAMPLE_TID) {
	COMP(pid);
	COMP(tid);
	}

	if (type & PERF_SAMPLE_TIME)
	COMP(time);

	if (type & PERF_SAMPLE_ADDR)
	COMP(addr);

	if (type & PERF_SAMPLE_ID)
	COMP(id);

	if (type & PERF_SAMPLE_STREAM_ID)
	COMP(stream_id);

	if (type & PERF_SAMPLE_CPU)
	COMP(cpu);

	if (type & PERF_SAMPLE_PERIOD)
	COMP(period);

	if (type & PERF_SAMPLE_READ) {
	if (read_format & PERF_FORMAT_GROUP)
	COMP(read.group.nr);
	else
	COMP(read.one.value);
	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
	COMP(read.time_enabled);
	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
	COMP(read.time_running);
	/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
	if (read_format & PERF_FORMAT_GROUP) {
	for (i = 0; i < s1->read.group.nr; i++) {
	/* FIXME: check values without LOST */
	if (read_format & PERF_FORMAT_LOST)
	MCOMP(read.group.values[i]);
	}
	} else {
	COMP(read.one.id);
	if (read_format & PERF_FORMAT_LOST)
	COMP(read.one.lost);
	}
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
	COMP(callchain->nr);
	for (i = 0; i < s1->callchain->nr; i++)
	COMP(callchain->ips[i]);
	}

	if (type & PERF_SAMPLE_RAW) {
	COMP(raw_size);
	if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
	pr_debug("Samples differ at 'raw_data'\n");
	return false;
	}
	}

	if (type & PERF_SAMPLE_BRANCH_STACK) {
	COMP(branch_stack->nr);
	COMP(branch_stack->hw_idx);
	for (i = 0; i < s1->branch_stack->nr; i++) {
	if (needs_swap)
	return ((host_is_bigendian()) ?
	(FLAG(s2).value == BS_EXPECTED_BE) :
	(FLAG(s2).value == BS_EXPECTED_LE));
	else
	MCOMP(branch_stack->entries[i]);
	}
	}

	if (type & PERF_SAMPLE_REGS_USER) {
	size_t sz = hweight_long(s1->user_regs.mask) * sizeof(u64);

	COMP(user_regs.mask);
	COMP(user_regs.abi);
	if (s1->user_regs.abi &&
	(!s1->user_regs.regs \|\| !s2->user_regs.regs \|\|
	memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
	pr_debug("Samples differ at 'user_regs'\n");
	return false;
	}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
	COMP(user_stack.size);
	if (memcmp(s1->user_stack.data, s2->user_stack.data,
	s1->user_stack.size)) {
	pr_debug("Samples differ at 'user_stack'\n");
	return false;
	}
	}

	if (type & PERF_SAMPLE_WEIGHT)
	COMP(weight);

	if (type & PERF_SAMPLE_DATA_SRC)
	COMP(data_src);

	if (type & PERF_SAMPLE_TRANSACTION)
	COMP(transaction);

	if (type & PERF_SAMPLE_REGS_INTR) {
	size_t sz = hweight_long(s1->intr_regs.mask) * sizeof(u64);

	COMP(intr_regs.mask);
	COMP(intr_regs.abi);
	if (s1->intr_regs.abi &&
	(!s1->intr_regs.regs \|\| !s2->intr_regs.regs \|\|
	memcmp(s1->intr_regs.regs, s2->intr_regs.regs, sz))) {
	pr_debug("Samples differ at 'intr_regs'\n");
	return false;
	}
	}

	if (type & PERF_SAMPLE_PHYS_ADDR)
	COMP(phys_addr);

	if (type & PERF_SAMPLE_CGROUP)
	COMP(cgroup);

	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
	COMP(data_page_size);

	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
	COMP(code_page_size);

	if (type & PERF_SAMPLE_AUX) {
	COMP(aux_sample.size);
	if (memcmp(s1->aux_sample.data, s2->aux_sample.data,
	s1->aux_sample.size)) {
	pr_debug("Samples differ at 'aux_sample'\n");
	return false;
	}
	}

	return true;
	}

	static int do_test(u64 sample_type, u64 sample_regs, u64 read_format)
	{
	struct evsel evsel = {
	.needs_swap = false,
	.core = {
	. attr = {
	.sample_type = sample_type,
	.read_format = read_format,
	},
	},
	};
	union perf_event *event;
	union {
	struct ip_callchain callchain;
	u64 data[64];
	} callchain = {
	/* 3 ips */
	.data = {3, 201, 202, 203},
	};
	union {
	struct branch_stack branch_stack;
	u64 data[64];
	} branch_stack = {
	/* 1 branch_entry */
	.data = {1, -1ULL, 211, 212, 213},
	};
	u64 regs[64];
	const u32 raw_data[] = {0x12345678, 0x0a0b0c0d, 0x11020304, 0x05060708, 0 };
	const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
	const u64 aux_data[] = {0xa55a, 0, 0xeeddee, 0x0282028202820282};
	struct perf_sample sample = {
	.ip = 101,
	.pid = 102,
	.tid = 103,
	.time = 104,
	.addr = 105,
	.id = 106,
	.stream_id = 107,
	.period = 108,
	.weight = 109,
	.cpu = 110,
	.raw_size = sizeof(raw_data),
	.data_src = 111,
	.transaction = 112,
	.raw_data = (void *)raw_data,
	.callchain = &callchain.callchain,
	.no_hw_idx = false,
	.branch_stack = &branch_stack.branch_stack,
	.user_regs = {
	.abi = PERF_SAMPLE_REGS_ABI_64,
	.mask = sample_regs,
	.regs = regs,
	},
	.user_stack = {
	.size = sizeof(data),
	.data = (void *)data,
	},
	.read = {
	.time_enabled = 0x030a59d664fca7deULL,
	.time_running = 0x011b6ae553eb98edULL,
	},
	.intr_regs = {
	.abi = PERF_SAMPLE_REGS_ABI_64,
	.mask = sample_regs,
	.regs = regs,
	},
	.phys_addr = 113,
	.cgroup = 114,
	.data_page_size = 115,
	.code_page_size = 116,
	.aux_sample = {
	.size = sizeof(aux_data),
	.data = (void *)aux_data,
	},
	};
	struct sample_read_value values[] = {{1, 5, 0}, {9, 3, 0}, {2, 7, 0}, {6, 4, 1},};
	struct perf_sample sample_out, sample_out_endian;
	size_t i, sz, bufsz;
	int err, ret = -1;

	if (sample_type & PERF_SAMPLE_REGS_USER)
	evsel.core.attr.sample_regs_user = sample_regs;

	if (sample_type & PERF_SAMPLE_REGS_INTR)
	evsel.core.attr.sample_regs_intr = sample_regs;

	if (sample_type & PERF_SAMPLE_BRANCH_STACK)
	evsel.core.attr.branch_sample_type \|= PERF_SAMPLE_BRANCH_HW_INDEX;

	for (i = 0; i < sizeof(regs); i++)
	(i + (u8 )regs) = i & 0xfe;

	if (read_format & PERF_FORMAT_GROUP) {
	sample.read.group.nr = 4;
	sample.read.group.values = values;
	} else {
	sample.read.one.value = 0x08789faeb786aa87ULL;
	sample.read.one.id = 99;
	sample.read.one.lost = 1;
	}

	sz = perf_event__sample_event_size(&sample, sample_type, read_format);
	bufsz = sz + 4096; /* Add a bit for overrun checking */
	event = malloc(bufsz);
	if (!event) {
	pr_debug("malloc failed\n");
	return -1;
	}

	memset(event, 0xff, bufsz);
	event->header.type = PERF_RECORD_SAMPLE;
	event->header.misc = 0;
	event->header.size = sz;

	err = perf_event__synthesize_sample(event, sample_type, read_format,
	&sample);
	if (err) {
	pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
	"perf_event__synthesize_sample", sample_type, err);
	goto out_free;
	}

	/* The data does not contain 0xff so we use that to check the size */
	for (i = bufsz; i > 0; i--) {
	if ((i - 1 + (u8 )event) != 0xff)
	break;
	}
	if (i != sz) {
	pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
	i, sz);
	goto out_free;
	}

	evsel.sample_size = __evsel__sample_size(sample_type);

	err = evsel__parse_sample(&evsel, event, &sample_out);
	if (err) {
	pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
	"evsel__parse_sample", sample_type, err);
	goto out_free;
	}

	if (!samples_same(&sample, &sample_out, sample_type, read_format, evsel.needs_swap)) {
	pr_debug("parsing failed for sample_type %#"PRIx64"\n",
	sample_type);
	goto out_free;
	}

	if (sample_type == PERF_SAMPLE_BRANCH_STACK) {
	evsel.needs_swap = true;
	evsel.sample_size = __evsel__sample_size(sample_type);
	err = evsel__parse_sample(&evsel, event, &sample_out_endian);
	if (err) {
	pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
	"evsel__parse_sample", sample_type, err);
	goto out_free;
	}

	if (!samples_same(&sample, &sample_out_endian, sample_type, read_format, evsel.needs_swap)) {
	pr_debug("parsing failed for sample_type %#"PRIx64"\n",
	sample_type);
	goto out_free;
	}
	}

	ret = 0;
	out_free:
	free(event);
	if (ret && read_format)
	pr_debug("read_format %#"PRIx64"\n", read_format);
	return ret;
	}

	/**
	* test__sample_parsing - test sample parsing.
	*
	* This function implements a test that synthesizes a sample event, parses it
	* and then checks that the parsed sample matches the original sample. The test
	* checks sample format bits separately and together. If the test passes %0 is
	* returned, otherwise %-1 is returned.
	*/
	static int test__sample_parsing(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
	{
	const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15, 20, 21, 22, 28, 29, 30, 31};
	u64 sample_type;
	u64 sample_regs;
	size_t i;
	int err;

	/*
	* Fail the test if it has not been updated when new sample format bits
	* were added. Please actually update the test rather than just change
	* the condition below.
	*/
	if (PERF_SAMPLE_MAX > PERF_SAMPLE_WEIGHT_STRUCT << 1) {
	pr_debug("sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating\n");
	return -1;
	}

	/* Test each sample format bit separately */
	for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
	sample_type <<= 1) {
	/* Test read_format variations */
	if (sample_type == PERF_SAMPLE_READ) {
	for (i = 0; i < ARRAY_SIZE(rf); i++) {
	err = do_test(sample_type, 0, rf[i]);
	if (err)
	return err;
	}
	continue;
	}
	sample_regs = 0;

	if (sample_type == PERF_SAMPLE_REGS_USER)
	sample_regs = 0x3fff;

	if (sample_type == PERF_SAMPLE_REGS_INTR)
	sample_regs = 0xff0fff;

	err = do_test(sample_type, sample_regs, 0);
	if (err)
	return err;
	}

	/*
	* Test all sample format bits together
	* Note: PERF_SAMPLE_WEIGHT and PERF_SAMPLE_WEIGHT_STRUCT cannot
	* be set simultaneously.
	*/
	sample_type = (PERF_SAMPLE_MAX - 1) & ~PERF_SAMPLE_WEIGHT;
	sample_regs = 0x3fff; /* shared yb intr and user regs */
	for (i = 0; i < ARRAY_SIZE(rf); i++) {
	err = do_test(sample_type, sample_regs, rf[i]);
	if (err)
	return err;
	}

	return 0;
	}

	DEFINE_SUITE("Sample parsing", sample_parsing);